CN101818298B - Corrosion-resistant medium-silicon-molybdenum-nickel-cobalt nodular cast iron alloy - Google Patents
Corrosion-resistant medium-silicon-molybdenum-nickel-cobalt nodular cast iron alloy Download PDFInfo
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Abstract
The invention relates to a corrosion-resistant medium silicon-molybdenum-nickel-cobalt nodular cast iron alloy. Specifically, the invention relates to a medium silicon-molybdenum-nickel-cobalt nodular cast iron alloy which comprises the following components in percentage by weight: c: 2.0 to 3.5 percent; si: 4.0 to 6.5 percent; mo: 0.6-1.5%; p: 0.01 to 0.05 percent; s: 0.01 to 0.03 percent; cr: 0.05 to 0.1 percent; ni: 0.1 to 0.3 percent; co: 0.05 to 0.1 percent; and the balance Fe. The invention also relates to a method for manufacturing the medium silicon molybdenum nickel cobalt nodular cast iron alloy, application of the medium silicon molybdenum nickel cobalt nodular cast iron alloy in manufacturing iron castings, and the iron castings comprising the medium silicon molybdenum nickel cobalt nodular cast iron alloy. The silicon-molybdenum-nickel-cobalt nodular cast iron alloy has excellent casting and corrosion resistance, high strength and toughness and good machinability, and is an ideal environment-friendly material due to the reduction of the consumption of Cr.
Description
Technical field
The invention belongs to the alloy casting technical field, be specifically related to a kind of corrosiron alloy novel material, particularly a kind of anti-corrosion medium-Si, Mo nickel-cobalt nodular cast iron alloy and method of manufacture thereof.
Background technology
At present, in industry such as shipbuilding, power plant, various ironcastings such as pipeline, the pump housing, valve are worked in media such as the atmosphere of being everlasting, seawater and soda acid salt, often lose efficacy because of corrosion at work, need possess higher corrosion resisting property.In dielectric solution, the electrode points position of graphite is the highest, and cementite takes second place, and ferritic is minimum.Graphite and cementite are negative electrodes, and ferritic is an anode, form microbattery, so ferritic will be constantly dissolved, produce serious galvanic corrosion.
The open CN1727508 of one Chinese patent application (application number 200510017821.7, open day 2006 02 month 01) discloses a kind of cast alloy iron of seawater corrosion resistance, and it is unit with the weight percent; Contain nickel 0.8～3.2, chromium Cr 0.6～1.2, silicon Si 1.2～2.2; Carbon C 2.8～3.4, manganese Mn 0.5～1.2, copper Cu 0.4～0.8; Antimony 0.1～0.4, Control of Impurities are in sulphur S≤0.12, and surplus is iron Fe; The cast alloy iron of seawater corrosion resistance that it is said this invention is applicable to equipment such as the gate of making water conservancy, hydroelectric project, gate slot, and the use properties in seawater surpasses stainless steel; Its intensity, toughness and processing characteristics can satisfy the request for utilization of hydraulic facility, have corrosion resistance nature and stronger mechanical property preferably.
Open CN1101683 (the application number 93118529.7 of one Chinese patent application; Open day 04 month 19 a days nineteen ninety-five) a kind of cast alloy iron of seawater corrosion resistance is disclosed; Be applicable to equipment such as the gate of making water conservancy, hydroelectric project, gate slot, it is characterized in that containing nickel, chromium, manganese, silicon, carbon, copper, it is said the water conservancy project equipment made from this cast alloy iron; Use properties surpasses stainless steel in seawater, and its intensity, toughness and processibility all can satisfy the request for utilization of hydraulic facility.
The open CN101225496 of one Chinese patent application (application number 200810014098.0, open day on 07 23rd, 2008) discloses a kind of low-alloy cast iron of seawater corrosion resistance, and be mainly used in and make seawater water works parts, be unit with the weight percent; It contains nickel 0.6-1.6, chromium Cr1.5-3.0, silicon Si 1.8-2.8; Carbon C 2.8-3.6, manganese Mn 0.6-1.0, copper Cu 1.5-3.0; Rare earth elements RE 0.1-0.3, aluminium Al≤0.4, antimony Sb≤0.1; Impurity P≤0.12, impurity S≤0.06, surplus is iron Fe; According to thinking that the seawater engineering of this invention considered that with corrosiron chromium, nickel, copper etc. improve the comprehensive action of the corrosion proof alloying element of cast iron, reduced under the condition of cost reducing nickel content, the corrosion resisting property of this seawater corrosion resistance cast iron is not less than the corrosion resisting property of Nimonic corrosiron.
The open CN101519749 of one Chinese patent application (application number 200810014684.5, open day on 09 02nd, 2009) discloses a kind of corrosion resistant, the cast iron materials of the impeller of sea water pump that resistance to wears, and each component and weight percent are: 18～20% nickel; 8～10% copper; 5～6% chromium; 4～5% titanium; Surplus is an iron, it is said that the metallurgical structure of this invention cast iron materials is obviously changed.
The open CN CN1051593 of one Chinese patent application (application number 89107331.0, open day on 05 22nd, 1991) discloses a kind of low chromium medium-Si, Mo ferrite ductile cast iron alloy, and its Chemical Composition (calculating by weight percentage) is: C:2.0～3.0%; Si:4.5～6.0; Mo 0.8～1.6%; Mn:0.06～0.17%; Cr:0.2～0.4%; P:0.03～0.07%; S:0.004～0.02%; Re:0.04～0.07%; Mg:0.03～0.05%; All the other are Fe, it is said that this invention alloy has high temperature tensile strength and anti-hot and cold fragility and resistance of oxidation preferably, and machining property is good.
Yet common medium-Si, Mo corrosiron hardness is very high, has high temperature tensile strength and anti-hot and cold fragility and resistance of oxidation preferably; But machining property is poor, inhales quick to take offensely, and linear shrinkage and internal stress are bigger; Be easy to cracking during casting, consumption Cr amount is too many, and environment is caused very big pollution.Therefore, develop a kind of new anti-corrosion medium-Si, Mo nickel-cobalt nodular cast iron alloy material and overcome above-mentioned defective, be still the research topic that those skilled in the art need to be resolved hurrily.
Summary of the invention
The objective of the invention is to solve the deficiency of common medium-Si, Mo corrosiron; What provide a kind ofly has good high-temperature tensile strength and anti-hot and cold fragility and a resistance of oxidation; And machinability, air-breathing property, linear shrinkage and internal stress characteristic are good, and casting is easy, lower, the eco-friendly anti-corrosion medium-Si, Mo nickel-cobalt nodular cast iron alloy material of consumption Cr amount.
The inventor finds unexpectedly; Through the nickel in the medium-Si, Mo nickel-cobalt nodular cast iron alloy material is increased; And reduce chromium wherein, and adding cobalt element simultaneously, thus obtained alloy has good high-temperature tensile strength and anti-hot and cold fragility and resistance of oxidation; And machinability, air-breathing property, linear shrinkage and internal stress characteristic are good, are that a kind of casting is easy, lower, the eco-friendly anti-corrosion medium-Si, Mo nickel-cobalt nodular cast iron alloy material of consumption Cr amount.The present invention is based on above-mentioned discovery and be accomplished.
First aspect present invention provides a kind of medium-Si, Mo nickel-cobalt nodular cast iron alloy, and by weight percentage, it comprises:
C：2.0-3.5％；
Si：4.0-6.5％；
Mo：0.6-1.5％；
P：0.01-0.05％；
S：0.01-0.03％；
Cr：0.05-0.1％；
Ni：0.1-0.3％；
Co:0.05-0.1%; With
The Fe of surplus.
According to each medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention; By weight percentage, it comprises: 2.2-3.5%, 2.4-3.5%, 2.6-3.5%, 2.8-3.5%, 2.0-3.3%, 2.0-3.2%, 2.0-3.1%, 2.2-3.3%, 2.4-3.2%, 2.6-3.1%, 2.8-3.1%, 2.9-3.1% or about 3.05% C (carbon).
According to each medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention; By weight percentage, it comprises: 4.2-6.5%, 4.4-6.5%, 4.6-6.5%, 4.8-6.5%, 5.0-6.5%, 4.0-6.3%, 4.0-6.2%, 4.0-6.0%, 4.0-5.8%, 4.0-5.6%, 4.0-5.4%, 4.1-6.4%, 4.2-6.3%, 4.3-6.2%, 4.4-6.1%, 4.5-6.0%, 4.6-5.9%, 4.7-5.8%, 4.8-5.7%, 4.9-5.6%, 5.0-5.5% or about 5.25% Si (silicon).
According to each medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention; By weight percentage, it comprises: 0.7-1.5%, 0.8-1.5%, 0.9-1.5%, 1.0-1.5%, 0.6-1.45%, 0.6-1.4%, 0.7-1.45%, 0.8-1.4%, 0.9-1.4%, 1.0-1.4% or about 1.35% Mo (molybdenum).
According to each medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention; By weight percentage, it comprises: 0.015-0.05%, 0.02-0.05%, 0.025-0.05%, 0.03-0.05%, 0.01-0.045%, 0.01-0.04%, 0.01-0.035%, 0.015-0.045%, 0.02-0.04%, 0.025-0.04%, 0.03-0.04% or about 0.035% P (phosphorus).
According to each medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention; By weight percentage, it comprises: 0.01-0.03%, 0.011-0.03%, 0.012-0.03%, 0.01-0.028%, 0.01-0.026%, 0.01-0.024%, 0.01-0.022%, 0.01-0.02%, 0.01-0.018%, 0.01-0.016%, 0.01-0.014%, 0.011-0.028%, 0.0115-0.026%, 0.0115-0.024%, 0.0115-0.022%, 0.0115-0.02%, 0.0115-0.018%, 0.0115-0.014% or about 0.012% S (sulphur).
According to each medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention; By weight percentage, it comprises: 0.05-0.1%, 0.052-0.1%, 0.054-0.1%, 0.056-0.1%, 0.058-0.1%, 0.06-0.1%, 0.05-0.09%, 0.05-0.085%, 0.05-0.08%, 0.05-0.075%, 0.05-0.07%, 0.055-0.09%, 0.06-0.08% or about 0.065% Cr (chromium).
According to each medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention; By weight percentage, it comprises: 0.1-0.3%, 0.12-0.3%, 0.14-0.3%, 0.16-0.3%, 0.18-0.3%, 0.2-0.3%, 0.1-0.28%, 0.1-0.26%, 0.1-0.25%, 0.1-0.24%, 0.12-0.28%, 0.14-0.26%, 0.16-0.25%, 0.18-0.25%, 0.2-0.25% or about 0.23% Ni (nickel).
According to each medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention; By weight percentage, it comprises: 0.05-0.1%, 0.052-0.1%, 0.054-0.1%, 0.056-0.1%, 0.058-0.1%, 0.05-0.09%, 0.05-0.08%, 0.05-0.07%, 0.052-0.09%, 0.054-0.085%, 0.056-0.08%, 0.058-0.075%, 0.06-0.07% or about 0.061% Co (cobalt).
According to each medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention, by weight percentage, it comprises the Fe (iron) of equal amount.In each a embodiment of medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention, said medium-Si, Mo nickel-cobalt nodular cast iron alloy comprises the Fe of C, Si, Mo, P, S, Cr, Ni, Co and surplus.In each a embodiment of medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention, said medium-Si, Mo nickel-cobalt nodular cast iron alloy comprises C, Si, Mo, P, S, Cr, Ni, Co, and all the other are Fe.
According to each medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention, by weight percentage, it comprises: C:2.5-3.5%; Si:4.25-6.25%; Mo:1.0-1.5%; P:0.02-0.05%; S:0.01-0.02%; Cr:0.05-0.08%; Ni:0.15-0.3%; Co:0.05-0.075%; Fe with surplus.In one embodiment, described medium-Si, Mo nickel-cobalt nodular cast iron alloy, by weight percentage, it comprises: C:2.5-3.5%; Si:4.25-6.25%; Mo:1.0-1.5%; P:0.02-0.05%; S:0.01-0.02%; Cr:0.05-0.08%; Ni:0.15-0.3%; Co:0.05-0.075%; All the other are Fe.
According to each medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention, by weight percentage, it comprises: C:2.75-3.25%; Si:4.75-5.75%; Mo:1.2-1.5%; P:0.025-0.045%; S:0.01-0.016%; Cr:0.055-0.075%; Ni:0.2-0.28%; Co:0.055-0.065%; Fe with surplus.In one embodiment, described medium-Si, Mo nickel-cobalt nodular cast iron alloy, by weight percentage, it comprises: C:2.75-3.25%; Si:4.75-5.75%; Mo:1.2-1.5%; P:0.025-0.045%; S:0.01-0.016%; Cr:0.055-0.075%; Ni:0.2-0.28%; Co:0.055-0.065%; All the other are Fe.
According to each medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention, by weight percentage, it comprises: C: about 3.05%; Si: about 5.23%; Mo: about 1.35%; P: about 0.035%; S: about 0.012%; Cr: about 0.066%; Ni: about 0.23%; Co: about 0.061%; Fe with surplus.In one embodiment, described medium-Si, Mo nickel-cobalt nodular cast iron alloy, by weight percentage, it comprises: C: about 3.05%; Si: about 5.23%; Mo: about 1.35%; P: about 0.035%; S: about 0.012%; Cr: about 0.066%; Ni: about 0.23%; Co: about 0.061%; All the other are Fe.
According to each medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention, by weight percentage, it comprises: C:3.05%; Si:5.23%; Mo:1.35%; P:0.035%; S:0.012%; Cr:0.066%; Ni:0.23%; Co:0.061%; Fe with surplus.
According to each medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention, by weight percentage, it comprises: C:2.0%; Si:4.0%; Mo:0.6%; P:0.01%; S:0.01%; Cr:0.05%; Ni:0.1%; Co:0.1%; Fe with surplus.
According to each medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention, by weight percentage, it comprises: C:3.5%; Si:6.48%; Mo:1.45%; P:0.05%; S:0.028%; Cr:0.101%; Ni:0.29%; Co:0.051%; Fe with surplus.
According to each medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention, by weight percentage, it comprises: C:3.55%; Si:4.23%; Mo:1.45%; P:0.02%; S:0.021%; Cr:0.05%; Ni:0.31%; Co:0.051%; Fe with surplus.
According to each medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention, by weight percentage, it comprises: C:2.55%; Si:6.26%; Mo:1.04%; P:0.048%; S:0.011%; Cr:0.081%; Ni:0.16%; Co:0.074%; Fe with surplus.
According to each medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention, by weight percentage, it comprises: C:2.77%; Si:5.73%; Mo:1.22%; P:0.046%; S:0.011%; Cr:0.076%; Ni:0.21%; Co:0.066%; Fe with surplus.
According to each medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention, by weight percentage, it comprises: C:3.23%; Si:4.77%; Mo:1.55%; P:0.021%; S:0.0161%; Cr:0.056%; Ni:0.28%; Co:0.054%; Fe with surplus.
According to each medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention, by weight percentage, it comprises: C:3.11%; Si:5.27%; Mo:1.32%; P:0.025%; S:0.011%; Cr:0.064%; Ni:0.25%; Co:0.067%; Fe with surplus.
Second aspect present invention provides the method for making each said medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention, and this method may further comprise the steps:
1) carry out the melting molten iron with the 150kg medium-frequency induction furnace, thermometric is carried out with SWD-1A rifle formula numeral temperature measurer in molten clear back, is controlled at about 1480-1520 ℃;
2) add nickel and ferrochrome furnace charge and powder blue, and other corresponding material;
3) carry out spheroidizing with the method for pouring, the spheroidizing time is about 2～3min, adds 1545～1565 ℃ of current-following inoculation spheroidization treatment temperatures, 1400～1430 ℃ of teeming temperatures with molten iron during cast.
Third aspect present invention provides the purposes of each said medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention in making ironcasting.
According to each purposes of third aspect present invention, wherein said ironcasting is selected from: pipeline, the pump housing, valve, container, distillation tower.
Fourth aspect present invention provides a kind of ironcasting, and it comprises each said medium-Si, Mo nickel-cobalt nodular cast iron alloy of first aspect present invention.
According to each ironcasting of fourth aspect present invention, it is selected from: pipeline, the pump housing, valve, container, distillation tower.
According to each ironcasting of fourth aspect present invention, it is formed by each said medium-Si, Mo nickel-cobalt nodular cast iron alloy manufacturing of first aspect present invention.
The characteristic that each had of the arbitrary aspect of the present invention or this arbitrary aspect is equally applicable to each of other arbitrary aspect or this other arbitrary aspect.In the present invention, when for example, mentioning " first aspect present invention each ", should " each " be meant the arbitrary sub-aspect of first aspect present invention, when others are mentioned in a similar manner, also have identical meanings.。
Do further to describe with characteristics to various aspects of the present invention below.
All documents that the present invention quoted from, their full content is incorporated this paper by reference into, and if the expressed implication of these documents and the present invention when inconsistent, be as the criterion with statement of the present invention.In addition; Various terms and phrase that the present invention uses have the general sense of well known to a person skilled in the art; Nonetheless; The present invention still hopes at this more detailed explanation and explanation to be done in these terms and phrase, and term of mentioning and phrase are as the criterion with the implication that the present invention was explained if any inconsistent with known implication.
As described herein, term " alloy " is meant two or more metal, or metal and nonmetal, through melting or sintering or the material with Special metallic features that combines with other method.The graphite that " medium-Si, Mo nickel-cobalt nodular cast iron alloy " is meant a kind of silicon molybdenum with middle high-temperature comprehensive property and suitable price and adds the nickel cobalt element is the globular cast iron alloy.
As described herein, " % ", as do not specialize, be meant the per-cent of w/w.
As described herein, C, Si, Mo, P, S, Cr, Ni, Co and Fe are meant elemental carbon, silicon, molybdenum, phosphorus, sulphur, chromium, nickel, cobalt and iron respectively.
As described herein; Term " about "; For example mentioned in " about 3.05% C (carbon) "; Its expression those skilled in the art acceptable limit of error, for example ± 20%, ± 15%, ± 10%, ± 5% or ± 2% error, the above-mentioned implication that should " pact " be had in this article it will be appreciated by those skilled in the art that and accepts.
As described herein, term " equal amount " perhaps " surplus " is meant as the basic components Fe in the medium-Si, Mo nickel-cobalt nodular cast iron alloy of the present invention, and its amount that in this alloy, adds makes that the summation of each group component in the alloy of the present invention is 100%.In addition; With regard to medium-Si, Mo nickel-cobalt nodular cast iron alloy of the present invention, it can also contain other smaller component or the impurity of component or impurity, particularly percentage amounts; For example aluminium, antimony etc., they can not produce adverse influence for the performance of medium-Si, Mo nickel-cobalt nodular cast iron alloy of the present invention.
The present invention is a kind of medium-Si, Mo nickel-cobalt nodular cast iron alloy material, it is characterized in that adding the Cr of Ni instead of part, has added the Co element simultaneously, and its chemical ingredients is: C:2.0-3.5%; Si:4.0-6.5%; Mo:0.6-1.5%; P:0.01-0.05%; S:0.01-0.03%; Cr:0.05-0.1%; Ni:0.1-0.3%; Co:0.05-0.1%; Fe (perhaps all the other are Fe) with surplus.Visible from result of study of the present invention, alloy of the present invention in the metallographic structure of as cast condition is: carbon mainly exists with the SG form, and matrix is silicon ferrite and minor amount of carbide.
In the cast iron alloy of the present invention; Si, Cr, Mo, Cr, Ni can form on the foundry goods top layer firmly, compact protective film, can improve the electropotential of cast iron matrix, can also make cast iron obtain monophasic ferritic; Thereby significantly improve the solidity to corrosion of cast iron; In addition, form SG and also can reduce the microbattery number, improved the solidity to corrosion of cast iron.Use the Cr of Ni instead of part simultaneously, reduced the consumption of Cr, protected environment.Add the Co element and promoted greying, significantly improve the fusing point of cast iron, itself can form intermetallic compound, produces dispersion-strengthened effect, and can stop the gathering of other carbide to be grown up, and has improved the machining of cast iron performance.
Medium-Si, Mo nickel-cobalt nodular cast iron alloy of the present invention has excellent casting and corrosion resisting property, and high intensity, toughness and favorable mechanical processibility owing to reduced the consumption of Cr, are environmentally friendly ideal materials.
Description of drawings
Fig. 1 is the as-cast metallographic structure photo of the embodiment of the invention 1 medium-Si, Mo nickel-cobalt nodular cast iron alloy under 100 times of opticmicroscopes.The result is visible from figure, and medium-Si, Mo nickel-cobalt nodular cast iron alloy of the present invention in the metallographic structure of as cast condition is: carbon mainly exists with the SG form, and matrix is silicon ferrite and minor amount of carbide.
Embodiment
Embodiment 1---the medium-Si, Mo nickel-cobalt nodular cast iron alloy
The medium-Si, Mo nickel-cobalt nodular cast iron alloy weight percent of present embodiment is formed as follows: C:3.05%; Si:5.23%; Mo:1.35%; P:0.035%; S:0.012%; Cr:0.066%; Ni:0.23%; Co:0.061%; All the other are Fe.
Method of manufacture:
1) carry out the melting molten iron with the 150kg medium-frequency induction furnace, thermometric is carried out with SWD-1A rifle formula numeral temperature measurer in molten clear back, is controlled at about 1480-1520 ℃;
2) add nickel and ferrochrome furnace charge and powder blue, and other corresponding material; 3) carry out spheroidizing with the method for pouring, the spheroidizing time is about 2～3min, adds 1545～1565 ℃ of current-following inoculation spheroidization treatment temperatures, 1400～1430 ℃ of teeming temperatures with molten iron during cast.
The medium-Si, Mo nickel-cobalt nodular cast iron alloy of present embodiment has good casting and corrosion resisting property, intensity height, good toughness, machinability is good; The acid that can be used for shipbuilding industry; Be applicable to that the transported substance rational faculty under-20 ℃～+ 80 ℃ temperature condition is similar to the medium of water, is used to carry residual oil, sweeping and sewage, seawater etc.
Embodiment 2---the medium-Si, Mo nickel-cobalt nodular cast iron alloy
The medium-Si, Mo nickel-cobalt nodular cast iron alloy weight percent of present embodiment is formed as follows: C:2.0%; Si:4.0%; Mo:0.6%; P:0.01%; S:0.01%; Cr:0.05%; Ni:0.1%; Co:0.1%; All the other are Fe.
Method of manufacture: the method for manufacture of reference implementation example 1 is carried out.
The medium-Si, Mo nickel-cobalt nodular cast iron alloy of present embodiment has good casting and corrosion resisting property, intensity height, good toughness, machinability is good.
Embodiment 3---the medium-Si, Mo nickel-cobalt nodular cast iron alloy
The medium-Si, Mo nickel-cobalt nodular cast iron alloy weight percent of present embodiment is formed as follows: C:3.5%; Si:6.48%; Mo:1.45%; P:0.05%; S:0.028%; Cr:0.101%; Ni:0.29%; Co:0.051%; All the other are Fe.
Method of manufacture: the method for manufacture of reference implementation example 1 is carried out.
The medium-Si, Mo nickel-cobalt nodular cast iron alloy of present embodiment has good casting and corrosion resisting property, intensity height, good toughness, machinability is good.
Embodiment 4---the medium-Si, Mo nickel-cobalt nodular cast iron alloy
The medium-Si, Mo nickel-cobalt nodular cast iron alloy weight percent of present embodiment is formed as follows: C:3.55%; Si:4.23%; Mo:1.45%; P:0.02%; S:0.021%; Cr:0.05%; Ni:0.31%; Co:0.051%; All the other are Fe.
Method of manufacture: the method for manufacture of reference implementation example 1 is carried out.
The medium-Si, Mo nickel-cobalt nodular cast iron alloy of present embodiment has good casting and corrosion resisting property, intensity height, good toughness, machinability is good.
Embodiment 5---the medium-Si, Mo nickel-cobalt nodular cast iron alloy
The medium-Si, Mo nickel-cobalt nodular cast iron alloy weight percent of present embodiment is formed as follows: C:2.55%; Si:6.26%; Mo:1.04%; P:0.048%; S:0.011%; Cr:0.081%; Ni:0.16%; Co:0.074%; Mg:0.0004%; All the other are Fe.
Method of manufacture: the method for manufacture of reference implementation example 1 is carried out.
The medium-Si, Mo nickel-cobalt nodular cast iron alloy of present embodiment has good casting and corrosion resisting property, intensity height, good toughness, machinability is good.
Embodiment 6---the medium-Si, Mo nickel-cobalt nodular cast iron alloy
The medium-Si, Mo nickel-cobalt nodular cast iron alloy weight percent of present embodiment is formed as follows: C:2.77%; Si:5.73%; Mo:1.22%; P:0.046%; S:0.011%; Cr:0.076%; Ni:0.21%; Co:0.066%; All the other are Fe.
Method of manufacture: the method for manufacture of reference implementation example 1 is carried out.
The medium-Si, Mo nickel-cobalt nodular cast iron alloy of present embodiment has good casting and corrosion resisting property, intensity height, good toughness, machinability is good.
Embodiment 7---the medium-Si, Mo nickel-cobalt nodular cast iron alloy
The medium-Si, Mo nickel-cobalt nodular cast iron alloy weight percent of present embodiment is formed as follows: C:3.23%; Si:4.77%; Mo:1.55%; P:0.021%; S:0.0161%; Cr:0.056%; Ni:0.28%; Co:0.054%; All the other are Fe.
Method of manufacture: the method for manufacture of reference implementation example 1 is carried out.
The medium-Si, Mo nickel-cobalt nodular cast iron alloy of present embodiment has good casting and corrosion resisting property, intensity height, good toughness, machinability is good.
Embodiment 8---the medium-Si, Mo nickel-cobalt nodular cast iron alloy
The medium-Si, Mo nickel-cobalt nodular cast iron alloy weight percent of present embodiment is formed as follows: C:3.11%; Si:5.27%; Mo:1.32%; P:0.025%; S:0.011%; Cr:0.064%; Ni:0.25%; Co:0.067%; All the other are Fe.
Method of manufacture: the method for manufacture of reference implementation example 1 is carried out.
The medium-Si, Mo nickel-cobalt nodular cast iron alloy of present embodiment has good casting and corrosion resisting property, intensity height, good toughness, machinability is good.
Reference example 1---a kind of low chromium medium-Si, Mo ferrite ductile cast iron alloy
The low chromium medium-Si, Mo ferrite ductile cast iron weight alloy per-cent of this reference example is formed as follows: C:2.88%; Si:5.09%; Mo:1.46%; Mn:0.15%; P:0.043%; S:0.007%; Cr:0.34%; Mg:0.031%; RE:0.075%; All the other are Fe.The method of manufacture of this reference alloy embodiment 1 is processed.
Reference example 2---a kind of seawater engineering is used the corrosiron material
The corrosiron material weight per-cent of this reference example is formed as follows: C:2.95%; Si:1.92%; Mn:0.72%; P≤0.12%; S≤0.06%; Cr:1.72%; Ni:0.92%; Cu:2.45%; Rare earth elements RE: 0.15%; All the other are Fe.Utilize medium-frequency induction furnace fusing molten iron; Add iron alloy in the fusing later stage; In the preceding adding of coming out of the stove, tapping temperature is controlled at 1440-1480 degree centigrade to REE with rare earth ferrosilicon alloy, carries out interior reinforcement of hot metal ladle with long-acting reinforcement nucleating agent when coming out of the stove and breeds; And when cast, carry out with the stream instant inoculation, teeming temperature is controlled at 1380-1420 degree centigrade.
Test Example 1---performance test
Adopt this area performance test methods commonly used that sample of the present invention is carried out performance test.Examination art state is an as cast condition.
Tensile strength (σ
b/ MPa) the test ratio juris is when receiving tension according to metallic substance, before fracture, and the load of the maximum that can bear on the unit surface.
Bending strength (σ
Bb/ MPa) the test ratio juris is according to metallic substance masterpiece time spent by bending, before fracture, and the load of the maximum that can bear on the unit surface.
More than two kinds of tests can on universal testing machine, carry out.
Hardness (HB) test ratio juris is according to being pressed into metal material surface with harden small ball or sintered carbide ball; Remove with its area of indentation and to be added in the load on the steel ball; The merchant of gained with corresponding TP, is hardness of metal materials numerical value through regulation after the hold-time.
Corrosion rate (mm/a) test ratio juris be when receiving uniform corrosion according to metal in the unit time, the depth of corrosion in the unit time places recirculating cooling water system with metal specimen, calculates its weightlessness after being corroded, with evaluation corrosion of metal speed.
The performance of each sample is through test, and the result is as shown in table 1.
Table 1. alloy sample The performance test results
| Sample | Tensile strength (σ b/MPa) | Bending strength (σ bb/MPa) | Hardness (HB) | Corrosion rate (mm/a) |
| Embodiment 1 | 326 | 620 | 319 | 0.21 |
| Embodiment 2 | 338 | 637 | 330 | 0.14 |
| Embodiment 3 | 320 | 620 | 316 | 0.16 |
| Embodiment 4 | 328 | 622 | 320 | 0.22 |
| Embodiment 5 | 329 | 621 | 315 | 0.16 |
| Embodiment 6 | 320 | 618 | 318 | 0.19 |
| Embodiment 7 | 321 | 627 | 330 | 0.19 |
| Embodiment 8 | 322 | 629 | 319 | 0.15 |
| Reference example 1 | 287 | 537 | 227 | 0.38 |
| Reference example 2 | 315 | 613 | 305 | 0.31 |
Each result is the MV of 5 tests.
The result is visible from table, and medium-Si, Mo nickel-cobalt nodular cast iron alloy of the present invention has the superperformance of the present invention's expectation.
Claims (13)
1. anti-corrosion medium-Si, Mo nickel-cobalt nodular cast iron alloy, by weight percentage, it consists of:
C：2.2-3.5％；
Si：4.0-6.5％；
Mo：0.6-1.5％；
P：0.01-0.05％；
S：0.01-0.03％；
Cr：0.05-0.1％；
Ni：0.1-0.3％；
Co:0.05-0.1%; With
The Fe of surplus.
2. according to the medium-Si, Mo nickel-cobalt nodular cast iron alloy of claim 1, by weight percentage, it comprises: the Si of 4.2-6.5%.
3. according to the medium-Si, Mo nickel-cobalt nodular cast iron alloy of claim 1, by weight percentage, it comprises: the Mo of 0.7-1.5%.
4. according to the medium-Si, Mo nickel-cobalt nodular cast iron alloy of claim 1, by weight percentage, it comprises: the P of 0.015-0.05%.
5. according to the medium-Si, Mo nickel-cobalt nodular cast iron alloy of claim 1, by weight percentage, it comprises: the S of 0.01-0.028%.
6. according to the medium-Si, Mo nickel-cobalt nodular cast iron alloy of claim 1, by weight percentage, it comprises: the Cr of 0.05-0.09%.
7. according to the medium-Si, Mo nickel-cobalt nodular cast iron alloy of claim 1, by weight percentage, it comprises: the Ni of 0.12-0.3%.
8. according to the medium-Si, Mo nickel-cobalt nodular cast iron alloy of claim 1, by weight percentage, it comprises: the Co of 0.05-0.09%.
9. according to each medium-Si, Mo nickel-cobalt nodular cast iron alloy of claim 2-8, by weight percentage, it consists of: C:2.5-3.5%; Si:4.25-6.25%; Mo:1.0-1.5%; P:0.02-0.05%; S:0.01-0.02%; Cr:0.05-0.08%; Ni:0.15-0.3%; Co:0.05-0.075%; Fe with surplus.
10. according to the medium-Si, Mo nickel-cobalt nodular cast iron alloy of claim 9, by weight percentage, it consists of: C:2.75-3.25%; Si:4.75-5.75%; Mo:1.2-1.5%; P:0.025-0.045%; S:0.01-0.016%; Cr:0.055-0.075%; Ni:0.2-0.28%; Co:0.055-0.065%; Fe with surplus.
11. an anti-corrosion medium-Si, Mo nickel-cobalt nodular cast iron alloy, by weight percentage,
It consists of: C:3.05%; Si:5.23%; Mo:1.35%; P:0.035%; S:0.012%; Cr:0.066%; Ni:0.23%; Co:0.061%; With the Fe of surplus, perhaps
It consists of: C:3.5%; Si:6.48%; Mo:1.45%; P:0.05%; S:0.028%; Cr:0.101%; Ni:0.29%; Co:0.051%; With the Fe of surplus, perhaps
It consists of: C:3.55%; Si:4.23%; Mo:1.45%; P:0.02%; S:0.021%; Cr:0.05%; Ni:0.31%; Co:0.051%; With the Fe of surplus, perhaps
It consists of: C:2.55%; Si:6.26%; Mo:1.04%; P:0.048%; S:0.011%; Cr:0.081%; Ni:0.16%; Co:0.074%; With the Fe of surplus, perhaps
It consists of: C:2.77%; Si:5.73%; Mo:1.22%; P:0.046%; S:0.011%; Cr:0.076%; Ni:0.21%; Co:0.066%; With the Fe of surplus, perhaps
It consists of: C:3.23%; Si:4.77%; Mo:1.55%; P:0.021%; S:0.0161%; Cr:0.056%; Ni:0.28%; Co:0.054%; With the Fe of surplus, perhaps
It consists of: C:3.11%; Si:5.27%; Mo:1.32%; P:0.025%; S:0.011%; Cr:0.064%; Ni:0.25%; Co:0.067%; Fe with surplus.
12. the purposes of each said medium-Si, Mo nickel-cobalt nodular cast iron alloy of claim 1 to 11 in making ironcasting.
13. an ironcasting, it comprises each said medium-Si, Mo nickel-cobalt nodular cast iron alloy of claim 1 to 11.
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