WO2018001097A1 - Sorbite stainless steel - Google Patents

Sorbite stainless steel Download PDF

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Publication number
WO2018001097A1
WO2018001097A1 PCT/CN2017/088256 CN2017088256W WO2018001097A1 WO 2018001097 A1 WO2018001097 A1 WO 2018001097A1 CN 2017088256 W CN2017088256 W CN 2017088256W WO 2018001097 A1 WO2018001097 A1 WO 2018001097A1
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stainless steel
sorbite
less
steel
content
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PCT/CN2017/088256
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French (fr)
Chinese (zh)
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董书通
王平
董铖喆
董铖昊
张伯成
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郑州永通特钢有限公司
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Publication of WO2018001097A1 publication Critical patent/WO2018001097A1/en

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel

Definitions

  • the invention relates to the technical field of stainless steel, in particular to a soxite stainless steel.
  • Existing stainless steel varieties include austenitic stainless steel, ferritic stainless steel, martensitic stainless steel, duplex stainless steel, and 200 series stainless steel.
  • Ferritic and austenitic stainless steels in these stainless steels are generally used only for the manufacture of vessels and panels due to their low strength. When used as a structural material, since the strength is low, the amount can be increased, and the cost is greatly increased.
  • Duplex stainless steel has good comprehensive performance, but the heat treatment process is difficult and costly, which is 2-3 times that of austenitic stainless steel, which limits its application.
  • the 200 series stainless steel is widely used due to its low price, but due to its low strength, the comprehensive mechanical properties cannot meet the requirements of becoming a structural material. Martensitic stainless steel cannot be used as structural steel due to its structural properties.
  • the technical problem to be solved by the present invention is to provide a Sorbite stainless steel whose main component is a Cr content of 8-15%, a Ni content of 1-5%, a P content of 0.03-1%, and a balance of Fe.
  • the C content is less than 0.1%
  • the S content is less than 0.04%
  • the O content is less than 30 ppm.
  • the stainless steel After the stainless steel is smelted by electric furnace and converter, it should be refined by AOD smelting and ladle furnace (LF), decarburizing, deoxidizing and desulfurizing the molten steel, and the steel is tempered and heat-treated.
  • LF AOD smelting and ladle furnace
  • the mechanical properties of the stellite stainless steel range are: breaking strength > 750 MPa, yield strength > 500 MPa, and elongation not less than 14%. And wherein the grain size of the stellite is controlled to be above 8 grades.
  • the stellite stainless steel of the invention has the characteristics of high strength, corrosion resistance and easy welding, overcomes the problem of low strength of austenitic stainless steel and ferritic stainless steel; overcomes the problem of corrosion of ordinary structural steel; overcomes duplex stainless steel
  • the high cost problem is a structural steel with good processing properties.
  • Figure 1 is a metallographic structure of a Soxhlet stainless steel of the present invention.
  • the present invention provides a sorbite stainless steel in view of the problems of low strength and high cost when the conventional stainless steel is used as a structural steel.
  • the smelting process of the stellite stainless steel is similar to the conventional steelmaking.
  • the molten iron is smelted through an electric furnace and a converter, and then subjected to tapping and alloying, and then subjected to AOD decarburization refining to adjust the alloy composition, followed by LF refining and deoxidation.
  • the temperature and composition of the molten steel are adjusted, and continuous casting into slab, round billet, billet, etc., and then rolling into sheet metal, etc., and finally tempering heat treatment to obtain a Sorbite stainless steel.
  • the main component of the Sorbite stainless steel is controlled by a Cr content of 8-15%, a Ni content of 1-5%, a P content of 0.03-1%, and a balance of Fe.
  • the C content is less than 0.1%
  • the S content is less than 0.04%
  • the O content is less than 30 ppm.
  • the mechanical properties of the prepared stellite stainless steel range are: breaking strength > 750 MPa, yield strength > 500 MPa, and elongation not less than 14%. And wherein the grain size of the stellite is controlled to be above 8 grades.
  • the metallographic structure of the Soxhlet stainless steel produced in the test is shown in Fig. 1. It can be seen that the metallographic structure is a sorbite and the grain size is 9 grade.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

A sorbite stainless steel, the main ingredient being iron, the main alloying elements being 8-16% chromium and 1-5% nickel, and also containing 0.01-0.1% phosphorus, the carbon being controlled to be less than 0.1%, sulphur to be less than 0.04%, and oxygen content to be less than 30 ppm. The present sorbite stainless steel, after smelting in an electric furnace and converter, undergoes AOD smelting and ladle furnace (LF) refining, and decarbonisation, deoxidation, and desulphurisation of the molten steel; the mechanical properties of the sorbite stainless steel are controlled by means of thermal treatment in order to achieve the ideal performance within a wide range; the stainless steel overcomes the problem of the low strength of austenitic stainless steel and ferritic stainless steel, the problem of the corrosion of ordinary structural steel, and the problem of the high cost of duplex stainless steel, and is a structural steel having excellent processing properties.

Description

一种索氏体不锈钢Soxhlet stainless steel 技术领域Technical field
本发明涉及不锈钢技术领域，特别是指一种索氏体不锈钢。The invention relates to the technical field of stainless steel, in particular to a soxite stainless steel.
背景技术Background technique
不锈钢现有品种包括奥氏体不锈钢、铁素体不锈钢、马氏体不锈钢、双相不锈钢、200系不锈钢。这些不锈钢中的铁素体和奥氏体不锈钢由于其强度较低，一般只用于制作器皿、面板。在用作结构材料时，由于其强度较低，只能加大用量，使成本大幅度增加。双相不锈钢有良好的综合性能，但热处理工艺难度较大，且成本过高，是奥氏体不锈钢的2-3倍，使其应用受到限制。200系不锈钢由于价格低廉得到广泛应用，但是也由于强度低，综合力学性能不能满足成为结构材料的要求。马氏体不锈钢由于其组织特性，不能够用作结构钢。Existing stainless steel varieties include austenitic stainless steel, ferritic stainless steel, martensitic stainless steel, duplex stainless steel, and 200 series stainless steel. Ferritic and austenitic stainless steels in these stainless steels are generally used only for the manufacture of vessels and panels due to their low strength. When used as a structural material, since the strength is low, the amount can be increased, and the cost is greatly increased. Duplex stainless steel has good comprehensive performance, but the heat treatment process is difficult and costly, which is 2-3 times that of austenitic stainless steel, which limits its application. The 200 series stainless steel is widely used due to its low price, but due to its low strength, the comprehensive mechanical properties cannot meet the requirements of becoming a structural material. Martensitic stainless steel cannot be used as structural steel due to its structural properties.
当今对钢结构材料的长寿命、高强度、易焊接、可接受成本的要求不断增加，成为当今钢铁材料领域创造发明的主攻方向之一。Today, the requirements for long life, high strength, easy welding and acceptable cost of steel structural materials are increasing, which has become one of the main directions for the invention of steel materials in the field.
发明内容Summary of the invention
本发明要解决的技术问题是提供一种索氏体不锈钢，该不锈钢主要成分为Cr含量8-15％，Ni含量1-5％，P含量0.03-1％，余量为Fe。其中，C含量小于0.1％，S含量小于0.04％，O含量小于30ppm。The technical problem to be solved by the present invention is to provide a Sorbite stainless steel whose main component is a Cr content of 8-15%, a Ni content of 1-5%, a P content of 0.03-1%, and a balance of Fe. Wherein the C content is less than 0.1%, the S content is less than 0.04%, and the O content is less than 30 ppm.
该不锈钢通过电炉、转炉冶炼后应当经过AOD冶炼、钢包炉(LF)精炼，对钢水进行脱碳、脱氧、脱硫，所制得钢材回火热处理制成。After the stainless steel is smelted by electric furnace and converter, it should be refined by AOD smelting and ladle furnace (LF), decarburizing, deoxidizing and desulfurizing the molten steel, and the steel is tempered and heat-treated.
该索氏体不锈钢的机械性能范围为：断裂强度>750MPa，屈服强度>500MPa，延伸率不小于14％。且其中索氏体晶粒度控制在8级以上。 The mechanical properties of the stellite stainless steel range are: breaking strength > 750 MPa, yield strength > 500 MPa, and elongation not less than 14%. And wherein the grain size of the stellite is controlled to be above 8 grades.
本发明的上述技术方案的有益效果如下：The beneficial effects of the above technical solution of the present invention are as follows:
本发明的索氏体不锈钢具有高强度、耐腐蚀、易焊接等特点，克服了奥氏体不锈钢、铁素体不锈钢的强度不高的问题；克服了普通结构钢锈蚀问题；克服了双相不锈钢的高成本问题，是一种具有良好加工性能的结构钢。The stellite stainless steel of the invention has the characteristics of high strength, corrosion resistance and easy welding, overcomes the problem of low strength of austenitic stainless steel and ferritic stainless steel; overcomes the problem of corrosion of ordinary structural steel; overcomes duplex stainless steel The high cost problem is a structural steel with good processing properties.
附图说明DRAWINGS
图1为本发明的索氏体不锈钢金相组织图。Figure 1 is a metallographic structure of a Soxhlet stainless steel of the present invention.
具体实施方式detailed description
为使本发明要解决的技术问题、技术方案和优点更加清楚，下面将结合附图及具体实施例进行详细描述。The technical problems, the technical solutions, and the advantages of the present invention will be more clearly described in the following description.
本发明针对现有的不锈钢用作结构钢时，强度低、成本高等问题，提供一种索氏体不锈钢。The present invention provides a sorbite stainless steel in view of the problems of low strength and high cost when the conventional stainless steel is used as a structural steel.
该索氏体不锈钢的冶炼过程与常规炼钢相似，首先，将铁水通过电炉、转炉冶炼，然后经过出钢、合金化，再经过AOD脱碳精炼，调整合金成分，继而进行LF精炼、脱氧，调整钢水的温度和成分，进行连铸成板坯、圆坯、方坯等，再经过轧制成板材棒材等，最后经过回火热处理制得索氏体不锈钢。The smelting process of the stellite stainless steel is similar to the conventional steelmaking. First, the molten iron is smelted through an electric furnace and a converter, and then subjected to tapping and alloying, and then subjected to AOD decarburization refining to adjust the alloy composition, followed by LF refining and deoxidation. The temperature and composition of the molten steel are adjusted, and continuous casting into slab, round billet, billet, etc., and then rolling into sheet metal, etc., and finally tempering heat treatment to obtain a Sorbite stainless steel.
索氏体不锈钢主要成分控制为Cr含量8-15％，Ni含量1-5％，P含量0.03-1％，余量为Fe。其中，控制C含量小于0.1％，S含量小于0.04％，O含量小于30ppm。The main component of the Sorbite stainless steel is controlled by a Cr content of 8-15%, a Ni content of 1-5%, a P content of 0.03-1%, and a balance of Fe. Wherein, the C content is less than 0.1%, the S content is less than 0.04%, and the O content is less than 30 ppm.
所制得的索氏体不锈钢的机械性能范围为：断裂强度>750MPa，屈服强度>500MPa，延伸率不小于14％。且其中索氏体晶粒度控制在8级以上。在试验中制得索氏体不锈钢的金相组织如图1所示，可以看出金相组织为索氏体，晶粒度在9级。The mechanical properties of the prepared stellite stainless steel range are: breaking strength > 750 MPa, yield strength > 500 MPa, and elongation not less than 14%. And wherein the grain size of the stellite is controlled to be above 8 grades. The metallographic structure of the Soxhlet stainless steel produced in the test is shown in Fig. 1. It can be seen that the metallographic structure is a sorbite and the grain size is 9 grade.
针对不同种类的索氏体不锈钢进行回火热处理实验，其结果如下表1所示。 The tempering heat treatment experiments were carried out for different kinds of sorbite stainless steels, and the results are shown in Table 1 below.
表1  不同种类索氏体不锈钢回火热处理工艺Table 1 Different types of sorbite stainless steel tempering heat treatment process
Figure PCTCN2017088256-appb-000001
Figure PCTCN2017088256-appb-000001
以上所述是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明所述原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。 The above is a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should also be considered as the scope of protection of the present invention.

Claims (6)

  1. 一种索氏体不锈钢，其特征在于：主要成分为：Cr含量8-15％，Ni含量1-5％，P含量0.03-1％，余量为Fe。A sorbite stainless steel characterized in that the main component is: a Cr content of 8-15%, a Ni content of 1-5%, a P content of 0.03-1%, and a balance of Fe.
  2. 根据权利要求1所述的索氏体不锈钢，其特征在于：所述不锈钢中C含量小于0.1％。The sorbite stainless steel according to claim 1, wherein the stainless steel has a C content of less than 0.1%.
  3. 根据权利要求1所述的索氏体不锈钢，其特征在于：所述不锈钢中S含量小于0.04％。The sorbite stainless steel according to claim 1, wherein the stainless steel has an S content of less than 0.04%.
  4. 根据权利要求1所述的索氏体不锈钢，其特征在于：所述不锈钢中O含量小于30ppm。The sorbite stainless steel according to claim 1, wherein the stainless steel has an O content of less than 30 ppm.
  5. 根据权利要求1所述的索氏体不锈钢，其特征在于：所述不锈钢的机械性能范围为：断裂强度>750MPa，屈服强度>500MPa，延伸率不小于14％。The stellite stainless steel according to claim 1, wherein the stainless steel has a mechanical property ranging from a breaking strength of 750 MPa, a yield strength of >500 MPa, and an elongation of not less than 14%.
  6. 根据权利要求1所述的索氏体不锈钢，其特征在于：所述不锈钢的索氏体晶粒度控制在8级以上。 The sorbite stainless steel according to claim 1, wherein the stainless steel has a Sauterite grain size of 8 or more.
PCT/CN2017/088256 2016-06-30 2017-06-14 Sorbite stainless steel WO2018001097A1 (en)

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CN111663071A (en) * 2020-06-17 2020-09-15 中冶东方工程技术有限公司 Economical chromium-manganese stainless steel smelting production method and system thereof

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CN110512143A (en) * 2019-09-09 2019-11-29 王平 Tough stainless structural steel of a kind of antidetonation fire resisting height and preparation method thereof
CN113122782B (en) * 2021-04-21 2022-03-15 浙江中煤机械科技有限公司 Stainless steel for pump head body and preparation method thereof
CN114774808A (en) * 2022-05-06 2022-07-22 温州理工学院 Low-cost wear-resistant stainless steel
CN114932146B (en) * 2022-06-30 2024-09-10 浙江青山钢铁有限公司 Rolling method of super duplex stainless steel wire
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CN116516267B (en) * 2023-03-21 2024-03-29 王平 Solid solution and nano-reinforced sorbite high-strength stainless structural steel and preparation method thereof

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CN111663071A (en) * 2020-06-17 2020-09-15 中冶东方工程技术有限公司 Economical chromium-manganese stainless steel smelting production method and system thereof

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