A high strength and toughness martensitic stainless steel

A martensitic stainless steel and molten steel technology, applied in the field of high-strength and tough martensitic stainless steel, can solve the problems of increased dosage, disappearance of low-temperature impact performance, low strength, etc., to expand the application field, good comprehensive performance, overcome toughness and low temperature poor performance

Active Publication Date: 2019-08-23
前海索新发展科技(深圳)有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When used as a structural material, due to its low strength, the amount can only be increased, which greatly increases the cost
Duplex stainless steel has good comprehensive properties, but the heat treatment process is difficult and the cost is too high, which is more than twice that of austenitic stainless steel, so its application is limited
200 series stainless steel is widely used due to its low price, but also due to its low strength, its comprehensive mechanical properties cannot meet the requirements of being a structural material
Martensitic stainless steel has poor toughness due to its microstructure, low-temperature transformation temperature is around 0°C, and low-temperature impact properties disappear, which greatly limits the use of martensitic stainless steel below 0°C

Method used

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  • A high strength and toughness martensitic stainless steel
  • A high strength and toughness martensitic stainless steel
  • A high strength and toughness martensitic stainless steel

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Embodiment Construction

[0023] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0024] The technical problem to be solved by the present invention is to provide a martensitic stainless steel. The mass percentage of the components contained in the stainless steel is: C content 0.06-0.3%, Cr content 11-15%, Ni content 1.5-3%, P content less than 0.08%, the S content is less than 0.008%, the O content is less than 30ppm, and the balance is Fe and impurities.

[0025] In some preferred embodiments, the content of silicon and manganese elements should be as small as possible.

[0026] As a preferred embodiment, the C content can be: 0.06%, 0.08%, 0.11%, 0.12%, 0.16%, 0.18%, 0.25%;

[0027] Cr content can be: 11%, 12%, 13%, 13.51%, 14.58%, 14.98%, 15%;

[0028] Ni content can be: 1.5%, 1.6%, 1.83%, 1.98%, 2.05%, 2.48%, 2.89%, 3%;

[0029] P content can be: 0.079%, 0.06%, 0.0597%, ...

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Abstract

The invention discloses martensite stainless steel with high strength and toughness. The stainless steel is prepared from the following components in percentage by mass: 0.06-0.3% of C, 11-15% of Cr,1.5-3% of Ni, less than 0.08% of P, less than 0.008% of S, less than 30 ppm of O and the balance of Fe and impurities. The martensite stainless steel has the characteristics of corrosion resistance, high strength, high toughness and low temperature impact resistance, overcomes the problem that martensite stainless steel and ferrite stainless steel are not high in strength, overcomes the problem that the conventional martensite stainless steel is poor in toughness and low-temperature performance, overcomes the high-cost problem of duplex stainless steel, and overcomes the defects that sorbite high-strength stainless structural steel has yield strength commonly smaller than 800 MPa, and breaking strength lower than 1000 MPa.

Description

technical field [0001] The invention relates to the technical field of new materials and iron and steel smelting, in particular to the technical field of stainless steel, in particular to a high-strength and tough martensitic stainless steel. Background technique [0002] The existing varieties of stainless steel include austenitic stainless steel, ferritic stainless steel, martensitic stainless steel, duplex stainless steel, 200 series stainless steel and precipitation hardening stainless steel. Ferritic and austenitic stainless steels in these stainless steels are generally only used to make utensils and panels due to their low strength. When used as a structural material, due to its low strength, the dosage can only be increased, which greatly increases the cost. Duplex stainless steel has good comprehensive properties, but the heat treatment process is difficult and the cost is too high, which is more than twice that of austenitic stainless steel, which limits its appli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/40C21D1/18C21D6/00
Inventor 董书通王平张超华张海峰周晓霞张艳丽张伯成赵正刚赵永璞
Owner 前海索新发展科技(深圳)有限公司
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