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Nickel-free metastable austenitic stainless steel with TRIP effect

A metastable austenite and stainless steel technology, applied in the field of austenitic stainless steel, can solve the problems of increased raw material cost, low strength, limited application range and sustainable development, and achieve reduced raw material cost, increased strength, and broad room temperature strength range effect

Inactive Publication Date: 2008-10-22
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the austenitic stainless steels widely used at home and abroad are mainly 300 series and 200 series, such as SUS304 and SUS201 and other austenitic stainless steels. These austenitic stainless steels contain nickel, and the addition of a large amount of nickel leads to the austenitic stainless steel The increase in the cost of stainless steel raw materials
Due to the lack of nickel and chromium in our country, nickel and chromium resources are scarce, and the strength of most austenitic stainless steels is low, which also limits the application range and sustainable development of these steels.

Method used

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  • Nickel-free metastable austenitic stainless steel with TRIP effect
  • Nickel-free metastable austenitic stainless steel with TRIP effect
  • Nickel-free metastable austenitic stainless steel with TRIP effect

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Stainless steel is smelted by non-vacuum induction furnace single smelting method, die-cast into ingots, forged and hot-rolled into 3.00mm thick hot-rolled plates. Solution annealing, the treatment temperature is 1000~1100℃. The room temperature mechanical properties of the obtained nickel-free metastable austenitic stainless steel were tested, and the room temperature mechanical properties are shown in Table 1.

[0040] Table 1 Tensile properties of hot-rolled and hot-rolled annealed plates at room temperature

[0041]

[0042] The chemical composition of the nickel-free metastable austenitic stainless steel in this embodiment is shown in Table 5.

[0043] The room temperature microstructure of the austenitic stainless steel in this embodiment after solution annealing is shown in figure 2 and image 3 ,from figure 2 and image 3 It can be seen that this stainless steel is a single-phase austenite structure, and there are many twine crystals.

Embodiment 2

[0045]Adopt electric arc furnace and AOD two-step method to smelt stainless steel, continuous casting into slab, hot rolling into 3.00mm thick hot-rolled plate. After intermediate annealing, cold rolling with a reduction of 50%. The mechanical properties at room temperature of the obtained nickel-free metastable austenitic stainless steel in the cold-rolled solution annealed state were tested, and the mechanical properties at room temperature are shown in Table 2. The chemical composition of the nickel-free metastable austenitic stainless steel in this embodiment is shown in Table 5.

[0046] Table 2 Tensile properties of cold-rolled solution-annealed sheets at room temperature

[0047]

Embodiment 3

[0049] The stainless steel is smelted by the electric arc furnace single smelting method, continuously cast into slabs, and hot-rolled into 3.00mm thick hot-rolled plates. After intermediate annealing, cold rolling was carried out according to reductions of 7.27%, 11.53%, 15.54%, 20.00%, 22.47%, 28.89%, 29.55%, and 50%, respectively. The mechanical properties of the obtained nickel-free metastable austenitic stainless steel cold-rolled at room temperature are tested. The mechanical properties at room temperature are shown in Table 3. The tensile mechanical properties at room temperature are shown in Table 3. Image 6 .

[0050] Table 3 Mechanical properties of cold-rolled sheets at different reductions

[0051]

[0052] The chemical composition of the nickel-free metastable austenitic stainless steel in this embodiment is shown in Table 5.

[0053] The cold-rolled microstructure of the austenitic stainless steel of this embodiment is shown in Figure 4 and Figure 5 ,fr...

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Abstract

The invention provides nickel-free metastable austenitic stainless steel with TRIP effect. The nickel-free metastable austenitic stainless steel comprises the following chemical composition in percentage by weight: 0.08-0.15 percent of C, less than 1 percent of Si, 8-10 percent of Mn, 15-16.5 percent of Cr, 0.15-0.30 percent of N, less than 0.03 percent of P, less than 0.02 percent of S, and the balance being Fe and inevitable impurities. The nickel-free metastable austenitic stainless steel can improve the strength of steel through cold working, ensures that material has wider strength range so as to meet various working condition demands, is especially suitable for weak corrosive environments, such as traffic, construction, hardware and other fields, and can partially replace AISI304, AISI301, AISI201 and other austenitic stainless steel with high nickel content so as to save noble metal nickel.

Description

technical field [0001] The invention relates to austenitic stainless steel, in particular to a nickel-free metastable austenitic stainless steel with TRIP effect. Background technique [0002] Metastable austenitic stainless steel is represented by AISI304, AISI301 and AISI201, which is a single-phase austenite structure at room temperature after solution treatment, and strain-induced martensite or temperature-dropped martensite will be produced after processing or cooling. Body stainless steel. At present, the austenitic stainless steels widely used at home and abroad are mainly 300 series and 200 series, such as SUS304 and SUS201 and other austenitic stainless steels. These austenitic stainless steels contain nickel, and the addition of a large amount of nickel leads to the austenitic stainless steel Increase in the cost of stainless steel raw materials. Due to the lack of nickel and chromium in our country, nickel and chromium resources are scarce, and the strength of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C21D8/02
Inventor 秦孝华胡锦程季灯平张志霞
Owner BAOSHAN IRON & STEEL CO LTD
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