CN101100724A - Hammer head material for annular hammer coal breaker - Google Patents
Hammer head material for annular hammer coal breaker Download PDFInfo
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- CN101100724A CN101100724A CNA2007100294698A CN200710029469A CN101100724A CN 101100724 A CN101100724 A CN 101100724A CN A2007100294698 A CNA2007100294698 A CN A2007100294698A CN 200710029469 A CN200710029469 A CN 200710029469A CN 101100724 A CN101100724 A CN 101100724A
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Abstract
A hammer material for cyclic hammer crusher is of wear-resistance and shock-resistance steel, containing (wt%): C 0.8-1.0, Si 0.2-0.4, Mn 8.0-10.0, Mo 0.2-0.5, Cr 3.0-4.0, V 0.05-0.1, and P not more than 0.045 and S not more than 0.045. It takes medium Mn-steel as substrate to be heat-treated with austenite structure at atmosphere. Its service life is 2-3 times longer than that of high Mn-steel.
Description
[technical field]
The present invention relates to a kind of wear resisting steel, especially relate to a kind of hammer head material with annular hammer coal breaker of wear-resisting, shock resistance advantage.
[background technology]
Broken lump coal is an important step in fuel-burning power plant, and the tup of ring hammer crusher is the key part in the lump coal breaking, also is consumable accessory, and its work-ing life and replacing number of times directly have influence on the crushing of lump coal, directly influence the normal operation in power station.
At present, the hammer head material of ring hammer crusher adopts high mangaenese steel (Mn13), and its chemical ingredients is (wt%): C:0.90～1.20, Mn:11.00～14.00, Si:0.30～0.80, S :≤0.050, P :≤0.070.High mangaenese steel is austenitic steel, and casting also obtains austenite structure under the room temperature, and directly apply on the crusher after the tough processing of water, carries out fragmentation and works.Austenitic initial hardness is HB190～230, and work hardening layer hardness can reach HB500～800, and thin hardened layer can reach several millimeters to tens millimeters.Under the intense impact operating mode,, thereby reach attrition resistant purpose owing to its surface hardening forms the good martensitic stucture of wear resistance; And the work hardening ability of high mangaenese steel under non-strong impact working condition can't be brought into play fully, promptly the surface can not form whole martensitic stuctures, the work hardening capacity of the material of workpiece surface is low, surface hardness often is lower than HB300～350, hardened layer is also very shallow, thereby reduced hardness, the intensity of its cast(ing) surface widely, so cause its wear resisting property not good enough, work-ing life is undesirable.
[summary of the invention]
For overcoming the above-mentioned shortcoming of prior art, the invention provides a kind of hammer head material that is applicable under non-strong impact working condition, has a kind of annular hammer coal breaker of excellent abrasive resistance.
The technical solution adopted for the present invention to solve the technical problems is: the broken lump coal material of a kind of ring hammer type, it mainly is a kind of wear-resisting, Notch Ductile Steel, described chemical ingredients wear-resisting, Notch Ductile Steel comprises C, Si, Mn, Mo, Cr, V, P and S, and the weight percent content of described each chemical ingredients is respectively: C:0.8～1.0, Si:0.2～0.4, Mn:8.0～10.0, Mo:0.2～0.5, Cr:3.0～4.0, V:0.05～0.1, P≤0.045, S≤0.045.
Also contain Re in the chemical ingredients of described wear-resisting, Notch Ductile Steel, its weight percent content is: 0.03～0.08.
From the design of chemical composition aspect, the configuration of C, Mn content is crucial; C is the element that promotes that austenite structure forms in manganese steel, and the solution strengthening effect of C improves the intensity of steel and initial hardness, thereby improves the wear resistance of steel.The C too high levels can reduce the toughness of steel, and lower C content weakens strengthening effect, and has reduced the amount of separating out of carbide, thereby has reduced wear resistance.Content that so C content must be greater than 0.8% (less than 0.8% being hypoeutectoid steel, greater than 0.8% being hypereutectoid steel, good carbide is separated out to guarantee abundant wear resistance, C content should greater than 0.8%); The content of manganese in considering, C content is suitable less than 1.0%.The adding of Re element, but cleaning molten steel have good deoxidation, desulfidation; But refined cast structure's crystal grain and improve distribution of carbides; Can improve form, quantity and the distribution of inclusion.So can improve the wear resistance of material, help the raising of material over-all properties, thereby improve the work-ing life of material.The add-on of Re is very few, do not have crystal grain thinning, improve inclusion form, improve the effects such as wear resistance of material; The Re add-on is too much, can bring more inclusion content again, evidence: the content of Re should be controlled at 0.03～0.08%.
Preparation method of the present invention mainly comprises following flow process: the first step is that sand mold is made, and second step was to smelt, and the 3rd step was to cast, and the 4th step was to clear up, and the 5th step was to heat-treat (the tough processing of water), passed through quality inspection then, made finished product.
It is to adopt 80 orders～140 purpose quartz sands that described sand mold is made, and adds white clay 3%～4% in this quartz sand, makes binding agent with water glass, stir the back and make sand mold, make stiffening agent with carbonic acid gas, after the sand mold sclerosis, at sand mold surface brush last layer pick English powder high-temperature resistant coating.
Described smelting is to adopt electric furnace or medium-frequency induction furnace; guarantee that its Chemical Composition is qualified, add aluminium at last and make final deoxygenation that steel scrap forbids molten steel directly to contact with air after melting into molten steel; must guarantee that covering slag covers molten steel, the molten steel tapping temperature is controlled at 1520～1550 ℃.
Described casting is molten steel directly to be poured be added with in advance in the casting ladle that content is the 0.2%Kg rare earth, fully stirs, and skims after leaving standstill for some time, casts when liquid steel temperature is 1465～1495 ℃.
Positively effect of the present invention is: it is material that the present invention adopts Medium Manganese Steel, and heat-treats gained, and its room temperature texture is an austenite, and this austenite structure has toughness preferably; Because of it contains Cr, Mo, many kinds of alloying elements of V, Re, contain the high compound of wear resistance in the tissue and form again (as C
R3C, C
R7C
3, C
R23C6, Mo
6C, VC etc.); Because of Mn content is lower, make product under non-strong impact working condition, also can form the martensitic hardening layer; The present invention is highly suitable for the working conditions under the non-strong impact working condition as broken lump coal material, and compare with traditional high mangaenese steel its work-ing life and can improve 2～3 times, promptly be 3～4 times of original life-span.
[description of drawings]
Fig. 1 is a thermal treatment process information drawing of the present invention.
[embodiment]
The present invention is further described below in conjunction with drawings and Examples.
A kind of broken lump coal material, adopt Medium Manganese Steel as material, its chemical ingredients is: Fe, C, Si, Mn, Mo, Cr, V, P and S, the weight percent content of described each chemical ingredients is respectively: (wt%) C:0.8～1.0, Si:0.2～0.4, Mn:8.0～10.0, Mo:0.2～0.5, Cr:3.0～4.0, V:0.05～0.1, P≤0.045, S≤0.045, in above-mentioned chemical constitution, also be added with the Re of trace, the weight percent content of Re is 0.03～0.08, and all the other are Fe.
Preparation method of the present invention mainly comprises following flow process: sand mold making, smelting, cast molding, cleaning, quenching, tempering, quality inspection, finished product.
In sand mold is made, adopt 80～140 purpose quartz sands, add white clay 3%～4% in the sand, make binding agent, stir the back and make sand mold, make stiffening agent, after the sand mold sclerosis, at sand mold surface brush last layer pick English powder high-temperature resistant coating with carbonic acid gas with water glass.
In smelting, adopt electric furnace or medium-frequency induction furnace, guarantee that its Chemical Composition is qualified, add aluminium at last and make final deoxygenation.Strictness forbade that molten steel directly contacts with air after steel scrap melted into molten steel, must guarantee the topped molten steel of covering slag.The molten steel tapping temperature is controlled at 1520～1550 ℃.
In cast molding, adopt molten steel directly to pour in advance in the casting ladle that is added with (0.2%Kg) rare earth, fully stir, skim after leaving standstill for some time, cast when liquid steel temperature is 1465～1495 ℃.
In heat treatment process, unpack earlier and take out product, cleared up overlap and burr after, heat-treat, the process of thermal treatment condition is seen Fig. 1.
Embodiment 1: with 140 purpose quartz sands, add white clay 3% in the sand, make binding agent with water glass, stir the back and make sand mold, make stiffening agent with two carbonitrides, after the sand mold sclerosis, at sand mold surface brush last layer pick English powder high-temperature resistant coating.Batching: ferrochrome, ferrosilicon, ferromanganese, molybdenum-iron, vanadium iron, rare earth, high-quality steel scrap, covering slag.Add aluminium deoxidation after composition is qualified again, 1540 ℃ of molten steel tapping temperatures, molten steel directly pours in advance in the casting ladle that is added with (0.2%Kg) rare earth, fully stirs, and skims after leaving standstill for some time, and liquid steel temperature is cast into foundry goods when being 1480 ℃ ℃.Treat that tup solidifies and cools off the back and unpack to take out in casting mold, cleared up overlap and burr after, heat-treat.The chemical element composition of finished product is (wt%):
The Chemical Composition of table 1 hammer head material (wt%)
| Element | C | Si | Mn | P | S | Mo | Cr | V | Re |
| Content | 0.93 | 0.33 | 9.55 | 0.033 | 0.026 | 0.41 | 3.25 | 0.081 | 0.05 |
Final microstructure is: austenite, be 84 days work-ing life.
Embodiment 2: with 140 purpose quartz sands, add white clay 3% in the sand, make binding agent with water glass, stir the back and make sand mold, make stiffening agent with two carbonitrides, after the sand mold sclerosis, at sand mold surface brush last layer pick English powder high-temperature resistant coating.Batching: ferrochrome, ferrosilicon, ferromanganese, molybdenum-iron, vanadium iron, rare earth, high-quality steel scrap, covering slag.Add aluminium deoxidation after composition is qualified again, 1530 ℃ of molten steel tapping temperatures, molten steel directly pours in advance in the casting ladle that is added with (0.2%Kg) rare earth, fully stirs, and skims after leaving standstill for some time, and liquid steel temperature is cast into foundry goods when being 1475 ℃.
Treat that annular hammer coal breaker solidifies and cools off the back and unpack to take out with hammer head material in casting mold, cleared up overlap and burr after, heat-treat.The chemical element composition of finished product is (wt%):
The Chemical Composition of table 2 hammer head material (wt%)
| Element | C | Si | Mn | P | S | Mo | Cr | V | Re |
| Content | 0.85 | 0.25 | 9.70 | 0.031 | 0.032 | 0.37 | 3.25 | 0.060 | 0.03 |
Final microstructure is: austenite, be 87 days work-ing life.
Embodiment 3: with 140 purpose quartz sands, add white clay 3% in the sand, make binding agent with water glass, stir the back and make sand mold, make stiffening agent with two carbonitrides, after the sand mold sclerosis, at sand mold surface brush last layer pick English powder high-temperature resistant coating.Batching: ferrochrome, ferrosilicon, ferromanganese, molybdenum-iron, vanadium iron, rare earth, high-quality steel scrap, covering slag.Add aluminium deoxidation after composition is qualified again, 1545 ℃ of molten steel tapping temperatures, molten steel directly pours in advance in the casting ladle that is added with (0.2%Kg) rare earth, fully stirs, and skims after leaving standstill for some time, and liquid steel temperature is cast into foundry goods when being 1490 ℃.
Treat that annular hammer coal breaker solidifies and cools off the back and unpack to take out with hammer head material in casting mold, cleared up overlap and burr after, heat-treat.The chemical element composition of finished product is (wt%):
The Chemical Composition of table 3 hammer head material (wt%)
| Element | C | Si | Mn | P | S | Mo | Cr | V | Re |
| Content | 0.90 | 0.31 | 9.15 | 0.031 | 0.036 | 0.25 | 3.35 | 0.071 | 0.08 |
Final microstructure is: austenite, be 92 days work-ing life.
The present invention adopts Medium Manganese Steel as material, and heat-treats gained, and its room temperature texture is an austenite.Because of it is an austenite structure, toughness is preferably arranged; Because of it contains chromium, molybdenum, vanadium, the multiple alloying element of rare earth, contain the high compound of wear resistance in the tissue and form again (as C
R3C, C
R7C
3, C
R23C6, Mo
6C, VC etc.); Because of Mn content is lower, make product under non-strong impact working condition, also can form the martensitic hardening layer; So this product has comprehensive preferably use properties.The present invention is highly suitable for the working conditions under the non-strong impact working condition as the hammer head material of annular hammer coal breaker, and its work-ing life and traditional high mangaenese steel specific energy mutually improve 2～3 times.
Claims (2)
1, a kind of hammer head material of annular hammer coal breaker, it mainly is a kind of wear-resisting, Notch Ductile Steel, it is characterized in that: described chemical ingredients wear-resisting, Notch Ductile Steel comprises C, Si, Mn, Mo, Cr, V, P and S, and the weight percent content of described each chemical ingredients is respectively: C:0.8～1.0, Si:0.2～0.4, Mn:8.0～10.0, Mo:0.2～0.5, Cr:3.0～4.0, V:0.05～0.1, P≤0.045, S≤0.045.
2, the hammer head material of annular hammer coal breaker as claimed in claim 1 is characterized in that: also contain Re in the chemical ingredients of described wear-resisting, Notch Ductile Steel, the weight percent content of Re is 0.03～0.08.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100294698A CN101100724A (en) | 2007-07-31 | 2007-07-31 | Hammer head material for annular hammer coal breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100294698A CN101100724A (en) | 2007-07-31 | 2007-07-31 | Hammer head material for annular hammer coal breaker |
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| CN101100724A true CN101100724A (en) | 2008-01-09 |
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| CNA2007100294698A Pending CN101100724A (en) | 2007-07-31 | 2007-07-31 | Hammer head material for annular hammer coal breaker |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787496B (en) * | 2010-01-08 | 2011-07-27 | 北京工业大学 | Wear resistant cast steel and preparation method thereof |
| CN103627964A (en) * | 2013-11-11 | 2014-03-12 | 马鞍山市恒毅机械制造有限公司 | High-initial-hardness alloy steel material for crusher hammer and preparation method thereof |
| CN103752787A (en) * | 2013-12-19 | 2014-04-30 | 宁国市东渡铸业有限公司 | Metal mold centrifuging casting process for composite high and low carbon manganese steel hammer |
| CN107663614A (en) * | 2017-08-21 | 2018-02-06 | 柳州科尔特锻造机械有限公司 | The preparation method of excavator bucket teeth |
| CN109402503A (en) * | 2018-10-23 | 2019-03-01 | 天津威尔朗科技有限公司 | A kind of novel high wear-resistant scraper plate and its manufacturing method |
| US10260121B2 (en) | 2017-02-07 | 2019-04-16 | GM Global Technology Operations LLC | Increasing steel impact toughness |
-
2007
- 2007-07-31 CN CNA2007100294698A patent/CN101100724A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787496B (en) * | 2010-01-08 | 2011-07-27 | 北京工业大学 | Wear resistant cast steel and preparation method thereof |
| CN103627964A (en) * | 2013-11-11 | 2014-03-12 | 马鞍山市恒毅机械制造有限公司 | High-initial-hardness alloy steel material for crusher hammer and preparation method thereof |
| CN103752787A (en) * | 2013-12-19 | 2014-04-30 | 宁国市东渡铸业有限公司 | Metal mold centrifuging casting process for composite high and low carbon manganese steel hammer |
| US10260121B2 (en) | 2017-02-07 | 2019-04-16 | GM Global Technology Operations LLC | Increasing steel impact toughness |
| CN107663614A (en) * | 2017-08-21 | 2018-02-06 | 柳州科尔特锻造机械有限公司 | The preparation method of excavator bucket teeth |
| CN109402503A (en) * | 2018-10-23 | 2019-03-01 | 天津威尔朗科技有限公司 | A kind of novel high wear-resistant scraper plate and its manufacturing method |
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Open date: 20080109 |