304 metastable-state austenitic stainless steel and preparation process thereof

A technology for austenitic stainless steel and its preparation process, which is applied in the field of 304 metastable austenitic stainless steel and its preparation process. It can solve the problems of reduced tensile properties of 304 stainless steel, affecting the processing and forming properties of stainless steel, and reducing plasticity and toughness. Achieve the effect of eliminating defects, improving plasticity and reducing hardness

Inactive Publication Date: 2019-10-15
深圳市裕丰隆金属材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the reduction of plasticity and toughness of 304 stainless steel during deformation processing such as stretching and stamping, stretching and stamping are prone to cracks or even breakage, resulting in a decrease in the tensile properties of 304 stainless steel, which ultimately affects the processing and forming properties of stainless steel

Method used

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  • 304 metastable-state austenitic stainless steel and preparation process thereof
  • 304 metastable-state austenitic stainless steel and preparation process thereof
  • 304 metastable-state austenitic stainless steel and preparation process thereof

Examples

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preparation example Construction

[0031] The preparation process of the 304 metastable austenitic stainless steel includes the following steps:

[0032] S1. Molten steel casting: melting and refining the stainless steel raw materials with the above steel components at a melting temperature T1 of 1150-1300°C, and casting them into stainless steel billets;

[0033] S2. Hot-rolling annealing treatment: hot-rolling and annealing the stainless steel billet obtained in the step S1, wherein the annealing adopts an isothermal annealing method, the isothermal annealing treatment temperature T4 is 600-800°C, and the annealing time t2 is 4-6h to obtain hot Rolled stainless steel black skin coils, hot-rolled stainless steel black skin coils meet the unit coil weight of 19-20kg / mm, and the yield strength is 600-800N / mm 2 . The hot-rolling start temperature T2 is specified to be above 1150°C, the rolling end temperature T3 is specified to be above 1050°C, and the interval time t1 between each pass is 2-60s for multi-pass r...

Embodiment 1

[0036] Example 1: A 304 metastable austenitic stainless steel has the following steel composition, which contains the elements shown in Table 1 in mass %. The preparation process of the 304 metastable austenitic stainless steel is as described above, and the parameters are shown in Table 2.

[0037] Table 1 embodiment 1-10 steel composition table (%)

[0038]

[0039] The preparation process parameter table of table 2 embodiment 1-10

[0040]

[0041]

[0042] The implementation principle and beneficial effects of this embodiment are: adding elements such as Si, Mn, Cu, Nb and N to stainless steel, by suppressing the precipitation of carbides or enriching C in austenite, the stability of austenite and austenite are improved. Reduce the amount of residual body, reduce the content of martensite generated in the process of stretching and stamping, improve the plasticity and toughness of stainless steel during deformation processing, so that 304 stainless steel is not ea...

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Abstract

The invention discloses 304 metastable-state austenitic stainless steel and a preparation process thereof. The 304 metastable-state austenitic stainless steel has the following steel components in percentage by mass: C less than 0.02%, 1.0-1.5% of Si, 1.0-2.0% of Mn, 19-21% of Cr, 9-12% of Ni, 1.5-2.5% of Cu, 0.03-0.05% of Nb, N less than 0.035%, and the balance of Fe and inevitable impurities; the fraction of ferritic phases is 50-80%; the balance comprises austenitic phases; the Md30 value given by the formula (A) is -20-20 DEG C; and Md30=551-462(C+N)-9.2(Si)-8.1(Mn)-29(Ni+Cu)-13.7(Cr)-18.5(Mo)...(A). The preparation process comprises the procedures of (S1) molten steel casting, (S2) hot-rolled annealing and (S3) cold rolling. The 304 metastable-state austenitic stainless steel has thetechnical effects of difficult cracking or rupture, excellent stretching performance and convenience for molding.

Description

technical field [0001] The invention relates to the technical field of stainless steel preparation and production, in particular to a 304 metastable austenitic stainless steel and a preparation process thereof. Background technique [0002] 304 stainless steel is a common material in stainless steel with a density of 7.93g / cm3. It is also called 18 / 8 stainless steel in the industry. In order to maintain the inherent corrosion resistance of stainless steel, the steel must contain more than 18% chromium and more than 8% nickel content. The common labeling methods on the market include 0Cr19Ni9 and SUS304, among which 06Cr19Ni10 generally indicates the national standard production, 304 generally indicates the ASTM standard production, and SUS 304 indicates the Japanese standard production. 304 stainless steel has a high temperature resistance of up to 800°C, and has the characteristics of good processing performance and high toughness. It is a versatile stainless steel. It is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/58C22C38/42C22C38/48C22C33/04C21D1/26C21D8/02
CPCC21D1/26C21D8/0226C21D8/0236C21D2211/001C21D2211/005C22C33/04C22C38/001C22C38/02C22C38/04C22C38/42C22C38/48C22C38/58
Inventor 张卫英阳建桥梁洪灿
Owner 深圳市裕丰隆金属材料有限公司
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