1000 Mpa grade high-strength metastable austenite-martensite stainless steel

A martensitic stainless steel, high-strength technology, applied in the field of stainless steel manufacturing, can solve the problems of high production cost, high material alloy cost, and limited development, and achieve low processing cost, excellent comprehensive performance of strength and toughness, and improved strength and toughness Effect

Active Publication Date: 2019-06-14
福建青拓特钢技术研究有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Maraging steel contains a large amount of expensive alloying elements such as Ni, Cu, Mo, Co, etc., and the material

Method used

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  • 1000 Mpa grade high-strength metastable austenite-martensite stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0040] Example 1

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

[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%; inevitable impurity elements.

[0043] (2) The preparation method of the above-mentioned 1000MPa grade 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, nitrogen-oxygen mixed gas is introduced to decarburize the molten steel and accurately control nitrogen, and then adjust the content of alloying elements to meet the control requirements for the content of alloying elements. After refining in the LF furnace, it is continuously cast into slabs, square billets or round billets. Subsequently, it is...

Example Embodiment

[0045] Example 2

[0046] (1) A 1000MPa grade high-strength metastable austenitic-martensitic stainless steel, having the following components by 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%, the balance being Fe and inevitable impurity elements.

[0047] (2) The manufacturing method is as in Example 1. 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 is 18%. For (V-notch) 85J / cm 2 .

Example Embodiment

[0048] Example 3

[0049] (1) A 1000MPa grade high-strength metastable austenitic-martensitic stainless steel, having the following components by 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%, the balance being Fe and inevitable impurity elements.

[0050] (2) The manufacturing method is as in Example 1. 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 is 20.1%. (V-notch) is 95J / cm 2 .

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Abstract

The invention relates to the technical field of stainless steel manufacturing, in particular to 1000 Mpa grade high-strength metastable austenite-martensite stainless steel. The 1000 Mpa grade high-strength metastable austenite-martensite stainless steel is prepared from the following components in percentage by mass: 0.03%-0.1% of C, 0.2%-1.0% of Si, 3.0%-5.0% of Mn, 13.0%-15.5% of Cr, 1.0%-3.0%of Ni, greater than or equal to 0.2% and less than or equal to 0.6% of Mo, less than or equal to 0.045% of P, less than or equal to 0.030% of S, 0.05%-0.15% of N, less than or equal to 0.30% of Ti, less than or equal to 0.30% of Nb, less than or equal to 0.3% of V, and the balance of Fe and inevitable impurity elements. The 1000 Mpa grade high-strength metastable austenite-martensite stainless steel has the beneficial effects that compared with traditional high-strength Cr13 series of martensite stainless steel, the intensity and toughness comprehensive performance is more excellent, and the corrosion resistance is high; and compared with martensite precipitation-hardening stainless steel, the machining difficulty is low, and the alloy and the manufacturing cost both 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-grade high-strength metastable austenitic-martensitic stainless steel. Background technique [0002] Martensitic stainless steel has the characteristics of good corrosion resistance and high hardness, strength and wear resistance, and is widely used in metal structural materials, such as construction, aviation and machinery manufacturing. Martensitic stainless steel is usually quenched to obtain a martensitic structure with high dislocation density, and then 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. Martensitic stainless steel can be divided into martensitic chromium stainless steel and martensitic chromium-nickel stainless steel according to the characteristics of chemical comp...

Claims

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Application Information

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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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