A 1000mpa high-strength metastable austenitic-martensitic stainless steel

A martensitic stainless steel, high-strength technology, applied in the field of stainless steel manufacturing, can solve the problems of restricted development, high production costs, and high material alloy costs

Active Publication Date: 2021-06-08
福建青拓特钢技术研究有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Maraging steel contains a large amount of expensive alloying elements such as Ni, Cu, Mo, Co, etc., and the material alloy cost is high; and stainless steel aging treatment, high production cost and other factors limit its development

Method used

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  • A 1000mpa high-strength metastable austenitic-martensitic stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) A high-strength metastable austenitic-martensitic stainless steel of 1000MPa grade, having the following components by mass percentage:

[0042] C: 0.06%; Si: 0.38%; Mn: 3.68%; Cr: 14.42%; Ni: 2.72%; P: 0.036%; S: 0.0015%; N: 0.11%; Mo: 0.30%; Unavoidable impurity elements.

[0043] (2) The preparation method of the above-mentioned 1000MPa high-strength metastable austenitic-martensitic stainless steel specifically includes: selecting molten iron from a blast furnace or an electric furnace, and performing alloying treatment to meet the requirements for dominant alloying elements. Then in the AOD process, the molten steel is decarburized and nitrogen-controlled by nitrogen-oxygen mixed gas, and then the content of alloying elements is adjusted to meet the control requirements for the content of alloying elements. After refining in LF furnace, it is continuously cast into slab or square billet or round billet. Subsequently, it is hot rolled into sheets, bars or prof...

Embodiment 2

[0046] (1) A 1000MPa grade high-strength metastable austenitic-martensitic stainless steel, which has the following components in mass percentage: C: 0.066%; Si: 0.40%; Mn: 4.05%; Cr: 14.3%; Ni: 2.75%; P: 0.040%; S: 0.0015%; N: 0.11%, Mo: 0.25%; V: 0.15%, and the balance is Fe and unavoidable impurity elements.

[0047] (2) The manufacturing method is as in Example 1, and the properties of the obtained 1000MPa grade high-strength metastable austenitic-martensitic stainless steel are as follows: the tensile strength is 1384MPa, the yield strength is 1055MPa, the elongation is 18%, and the impact toughness For (V-shaped notch) 85J / cm 2 .

Embodiment 3

[0049] (1) A 1000MPa high-strength metastable austenitic-martensitic stainless steel, which has the following components in mass percentage: C: 0.064%; Si: 0.45%; Mn: 4.5%; Cr: 14.1%; Ni: 2.8%; P: 0.040%; S: 0.0051%; N: 0.098%; Mo: 0.2%; V: 0.15%; Ti: 0.1%, and the balance is Fe and unavoidable impurity elements.

[0050] (2) The manufacturing method is as in Example 1, and the properties of the obtained 1000MPa grade high-strength metastable austenitic-martensitic stainless steel are as follows: the tensile strength is 1338MPa, the yield strength is 1085MPa, the elongation is 20.1%, and the impact toughness (V-shaped notch) is 95J / cm 2 .

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Abstract

The invention relates to the technical field of stainless steel manufacturing, in particular to a 1000MPa grade high-strength metastable austenitic-martensitic stainless steel, which has the following components in mass percentage: C: 0.03-0.1%; Si: 0.2-1.0 %;Mn:3.0‑5.0%;Cr:13.0‑15.5%;Ni:1.0‑3.0%;0.2%≤Mo≤0.6%;P≤0.045%;S≤0.030%;N:0.05‑0.15%;Ti≤ 0.30%; Nb≤0.30%; V:≤0.3%; the balance is Fe and unavoidable impurity elements. The beneficial effects of the present invention are: compared with the traditional high-strength Cr13 series martensitic stainless steel, the comprehensive performance of strength and toughness is more excellent, and corrosion resistance; Manufacturing costs have obvious advantages.

Description

technical field [0001] The invention belongs to the technical field of stainless steel manufacturing, and in particular relates to a 1000Mpa high-strength metastable austenitic-martensitic stainless steel. Background technique [0002] Martensitic stainless steel has the characteristics of good corrosion resistance, high hardness, strength and wear resistance, and is widely used in metal structural materials, such as construction, aviation and machinery manufacturing and other fields. Martensitic stainless steel is usually quenched to obtain a martensite structure with a high dislocation density, and then through tempering to eliminate internal stress, reduce dislocation density, and obtain a uniform and stable tempered martensite structure, thereby obtaining plasticity, A combination of toughness and strength. According to the characteristics of chemical composition, martensitic stainless steel can be divided into two categories: martensitic chromium stainless steel and ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/44C22C38/02C21D1/18
Inventor 姜海洪蒋一江来珠邹文辉周庆龙姜美雪
Owner 福建青拓特钢技术研究有限公司
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