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A kind of high-nitrogen non-magnetic stainless steel with good comprehensive performance and its manufacturing method

A technology with comprehensive performance and manufacturing method, applied in the field of high nitrogen non-magnetic stainless steel and its manufacturing, can solve the problems of improving the effect to be improved and increasing the process.

Active Publication Date: 2021-10-15
BAOSTEEL DESHENG STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, scheme 1) as a remedial measure for the formed mountain-shaped scale defects, there is a problem of increasing the process, and scheme 2) for the surface defects of mountain-shaped scale folds generated during the thermal processing of non-magnetic austenitic stainless steel with high N composition system There is still room for improvement

Method used

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  • A kind of high-nitrogen non-magnetic stainless steel with good comprehensive performance and its manufacturing method
  • A kind of high-nitrogen non-magnetic stainless steel with good comprehensive performance and its manufacturing method
  • A kind of high-nitrogen non-magnetic stainless steel with good comprehensive performance and its manufacturing method

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Embodiment 1

[0040] A high-nitrogen non-magnetic stainless steel with good comprehensive performance, its chemical composition weight percentage is: C: 0.15%, Si: 0.4%, Mn: 14.2%, P: 0.035%, S: 0007%, Cr: 18.2%, Ni : 1.8%, N: 0.32%, the balance is Fe and unavoidable impurities; among them, Cr eq / Ni e =1.89, Cr eq =Cr%+1.37Mo%+1.5Si%, Ni eq =Ni%+0.31Mn%+22C%+14.2N%

[0041] Take the production process of blast furnace low-nickel molten iron-GOR-LF smelting as an example:

[0042] The method for manufacturing the aforementioned high-nitrogen non-magnetic austenitic stainless steel with good comprehensive properties comprises the following steps:

[0043] 1) Smelting: Melt ferrochrome in the intermediate frequency furnace, adjust the low-nickel molten iron from the blast furnace in the mixed iron furnace, pour the molten steel into the GOR furnace after melting, and carry out de-C, de-S and N addition in the GOR furnace. N blowing, when the smelting composition meets the requirements, t...

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Abstract

The invention discloses a high-nitrogen non-magnetic stainless steel with good comprehensive performance and a manufacturing method thereof. The chemical composition weight percentage of the high-nitrogen non-magnetic stainless steel is: C: 0.10-0.20%, Si 0.20-0.75%, Mn: 13.0- 16.0%, P≤0.06%, S≤0.015%, Cr: 17.0~19.0%, Ni: 1.5~2.5%, N: 0.25~0.40%; the balance is Fe and unavoidable impurities; and the above elements must meet The following relationship: 1.60≤Cr eq / Ni eq ≤1.96. Then combined with a suitable thermal processing process, it can not only ensure that the material has good non-magnetic properties, but also ensure thermal processing performance. The hot-rolled surface quality is good, which significantly improves the high-N composition system non-magnetic austenitic stainless steel during thermal processing. Yamagata scale break class surface defects.

Description

technical field [0001] The invention relates to a stainless steel smelting process, in particular to a high-nitrogen non-magnetic stainless steel with good comprehensive performance and a manufacturing method thereof. Background technique [0002] Non-magnetic stainless steel is often used in electronics, instrumentation and other industries. Commonly used non-magnetic stainless steels are 304, 305 and so on. According to the ASTM A240 standard, the standard composition of 304 is: C ≤0.07%, Si ≤0.75%, Mn ≤2.0%, Cr 18.0~20.0%, Ni 8.0~10.5%, N≤0.10%. Generally, the typical composition of 304 is C 0.06%, Si 0.4%, Mn 1.0%, Cr 18%, Ni 8%, N 0.05%. Solid solution 304 is non-magnetic, but 304 produces a large amount of strain-induced martensite after cold working, and the martensite phase is magnetic, which makes the whole material magnetic. 305 stainless steel with higher Ni content (12%Ni) can maintain non-magnetic or weak magnetic characteristics under the condition of lower ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/58C21D8/02C22C33/04
CPCC21D8/0205C21D2211/001C22C33/04C22C38/001C22C38/02C22C38/58
Inventor 王治宇宋红梅董涛庄青云邵世杰周磊磊
Owner BAOSTEEL DESHENG STAINLESS STEEL