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High-strength stainless steel and manufacturing method thereof

A manufacturing method and stainless steel technology, applied in the field of high-strength stainless steel and its preparation, can solve the problems of reduced thermal processing performance, poor welding adaptability, edge cracks of duplex stainless steel strip, etc., and achieve the effect of reducing the occurrence of welding hot cracks

Active Publication Date: 2020-05-08
浙江吉森金属科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nitrogen precipitates nitrides in the hot-working temperature range, which reduces the hot-working performance and causes serious edge cracks in industrially produced dual-phase steel and high-nitrogen austenitic stainless steel strips.
The third type is martensitic precipitation hardening stainless steel, whose solid solution strength can reach more than 700 MPa, but the industrial production of martensitic precipitation hardening stainless steel is difficult, and the welding adaptability is poor, and the weld is prone to defects such as hot cracks

Method used

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  • High-strength stainless steel and manufacturing method thereof
  • High-strength stainless steel and manufacturing method thereof
  • High-strength stainless steel and manufacturing method thereof

Examples

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Effect test

Embodiment 1

[0090] A high-strength stainless steel, the composition of which contains in mass %,

[0091] C: 0.04 to 0.09% by mass,

[0092] Si: 1.5 to 2.5% by mass,

[0093] Mn: less than 1.0% by mass,

[0094] Cr: 13.0 to 15.0% by mass,

[0095] Ni: 6.0 to 7.0% by mass,

[0096] N: less than 0.010% by mass,

[0097] Mo: 0.6 to 1.0% by mass,

[0098] Cu: 0.6 to 1.0% by mass,

[0099] Ti: 0.3 to 0.8% by mass,

[0100] B: less than 0.03% by mass,

[0101] V: less than 0.3% by mass

[0102] P: less than or equal to 0.030% by mass,

[0103] S: less than or equal to 0.005% by mass,

[0104] The rest is Fe and unavoidable impurity elements;

[0105] Wherein, Cr+Mo+0.5Ti=Creq;

[0106] Ni+30*(C+N)+0.5Mn+0.25Cu=Nieq;

[0107] 1.4≤Creq / Nieq≤1.8.

[0108] The present invention also provides a kind of manufacturing method of described high-strength stainless steel, comprises the following steps:

[0109] A. Select a steel slab that meets the composition requirements of the high-stren...

Embodiment 2

[0127] After the smelted molten steel is cast into a slab, it is fully ground at a certain temperature to remove the surface defects of the slab, and the temperature after the grinding is greater than 200°C. The chemical composition of the steel slabs is shown in Table 1.

[0128] The chemical composition of table 1 present embodiment steel slab

[0129] Example 2 C Si mn S P Cr Ni Cu Mo Ti N B V Creq / Nieq 1 0.04 1.5 0.9 0.005 0.03 13.0 6.7 0.6 0.6 0.3 0.01 0 0.3 1.56 2 0.045 1.7 0.5 0.002 0.023 14.1 6.9 0.8 0.8 0.35 0.01 0.001 0.2 1.68 3 0.055 1.8 0.4 0.001 0.028 14.0 6.7 0.84 0.7 0.38 0.007 0.002 0.1 1.66 4 0.09 1.8 0.8 0.003 0.025 15.0 7.5 1 0.8 0.5 0.008 0.003 0 1.45 5 0.06 1.75 0.5 0.001 0.027 13.5 7.1 0.7 0.75 0.4 0.004 0.002 0.24 1.50

[0130] The ground steel slab is heated in a heating furnace, hot rolled, solution pickled for black coils, cold ...

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Abstract

The invention discloses high-strength stainless steel. The high-strength stainless steel comprises the following components in percentage by mass (mass%): 0.04-0.09 mass% of C, 1.5-2.5 mass% of Si, Mnless than 1.0 mass%, 13.0-15.0 mass% of Cr, 6.0-7.0 mass% of Ni, N less than 0.010 mass%, 0.6-1.0 mass% of Mo, 0.6-1.0 mass% of Cu, 0.3-0.8 mass% of Ti, B less than 0.03 mass%, V less than 0.3 mass%,P less than and equal to 0.030 mass%, S less than and equal to 0.005 mass%, and the balance of Fe and inevitable impurity elements, wherein Cr+Mo+0.5Ti=Creq, Ni+30*(C+N)+0.5Mn+0.25Cu=Nieq, and Creq / Nieq is not more than 1.8 and not less than 1.4. The high-strength stainless steel obtains a full austenite structure in the hot working process through reasonable component design; a structure after the solid solution treatment is an austenite and martensite dual-phase structure; and a high-temperature ferrite is separated out preferentially during solidification, so that the generation of weldinghot cracks is effectively reduced, and meanwhile, the strength of welding lines is guaranteed to be equivalent to that of a base metal after welding.

Description

technical field [0001] The invention relates to the technical field of high-strength stainless steel and its preparation, in particular to a high-strength stainless steel and a manufacturing method thereof. Background technique [0002] After more than 100 years of development, the application fields of stainless steel have been continuously expanded, but due to its low strength, it has been greatly restricted as a structural functional material. [0003] There are three ways to improve the strength, one is work hardening, for example, the yield strength of 300 series stainless steel is less than 300MPa, in order to improve its strength, cold working is adopted, such as patents CN101259483A and CN101234395A, the strength of the stainless steel base material after work hardening is improved, but As a structural part, the strength of the weld decreases rapidly after welding, and the yield strength of the weld is close to that of the solid solution base metal, and the yield str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C22C38/50C22C38/46C22C38/44C22C38/42C22C38/02C22C38/04C21D8/02B23P15/00
CPCB23P15/00C21D8/0226C21D8/0236C21D8/0263C21D2211/001C21D2211/008C22C38/04C22C38/34C22C38/42C22C38/44C22C38/46C22C38/50C22C38/54
Inventor 贾楠俞亚青
Owner 浙江吉森金属科技有限公司
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