1000MPa grade nickel-saving type metastable austenite stainless steel

A metastable austenitic and stainless steel technology, applied in the field of austenitic stainless steel, can solve the problem of high raw material cost, and achieve the effect of reducing raw material cost, improving strength and widening strength range

Inactive Publication Date: 2008-09-24
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This stainless steel contains molybdenum and copper elements, and the raw material cost of steel is relatively high

Method used

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  • 1000MPa grade nickel-saving type metastable austenite stainless steel
  • 1000MPa grade nickel-saving type metastable austenite stainless steel
  • 1000MPa grade nickel-saving type metastable austenite stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 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-saving metastable austenitic stainless steel were tested, and the room temperature mechanical properties are shown in Table 1. The chemical composition of the nickel-saving metastable austenitic stainless steel in this embodiment is shown in Table 5.

[0045] 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.

[0046] Table 1 Tensile properties of hot-rolled and hot-rolled annealed plates at room temperature

[0047]

Embodiment 2

[0049] 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 room temperature mechanical properties of the obtained nickel-saving metastable austenitic stainless steel in the cold-rolled solution annealed state were tested, and the room temperature mechanical properties are shown in Table 2. The chemical composition of the nickel-saving metastable austenitic stainless steel in this embodiment is shown in Table 5.

[0050] Table 2 Tensile properties of cold-rolled solution-annealed sheets at room temperature

[0051]

Embodiment 3

[0053] 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 9.07%, 13.31%, 14.06%, 20.31%, and 50%, respectively. The mechanical properties of the obtained nickel-saving metastable austenitic stainless steel in the cold-rolled condition 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. Figure 6 . The chemical composition of the nickel-saving metastable austenitic stainless steel in this embodiment is shown in Table 5.

[0054] The cold-rolled microstructure of the austenitic stainless steel of this embodiment is shown in Figure 4 and Figure 5 ,From Figure 4 and Figure 5 It can be seen that the volume fraction of strain-induced lath martensite is 46%...

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Abstract

The invention provides 1000MPa class nickel-saving type metastable austenite stainless steel. The chemical components of the nickel-saving type metastable austenite stainless steel of the invention calculated by weight percentage include 0.06 to 0.15 percent of C, less than 1 percent of Si, 8 to 10 percent of Mn, 15 to 17 percent of Cr, 0.5 to 1.2 percent of Ni, 0.15 to 0.30 percent of N, less than 0.03 percent of P, less than 0.02 percent of S and the rest are Fe and unavoidable impurities. The room temperature yield stress of a cold processing state of the invention can reach 1250MPa, the anti-tension intensity can reach 1460MPa and the average room temperature extension rate can be maintained to be 16.8 percent. Under different states, the room temperature yield stress of the material is 370 to 1250MPa and the room temperature anti-tension intensity is 860 to 1460MPa. The room temperature anti-tension intensity of a cold-rolling solid solution state can reach over 1000MPa and the extension rate is larger than 40 percent. The invention has high intensity and excellent plasticity. The excellent room temperature mechanical performance of the 1000MPa class nickel-saving type metastable austenite stainless steel of the invention can be remarkably distinguished from the normal metastable austenite stainless steel and is suitable for weak-corrosion environments such as the fields of traffic, construction and hardware, etc., and can partially replace the austenitic stainless steels with high nickel contents like AISI304, AISI301 and AISI201, etc., so as to save the expensive metal nickel.

Description

technical field [0001] The invention relates to austenitic stainless steel, in particular to a 1000MPa nickel-saving metastable austenitic stainless steel. 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 AISI304 and AISI201 and other austenitic stainless steels. These austenitic stainless steels contain more nickel, and the addition of a large amount of nickel leads to these Raw material cost of austenitic stainless steel increases. Due to the lack of nickel and chromium in our country, nickel and chromium resources are scarce, and the strength of most austenitic stainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C21D8/00
Inventor 秦孝华胡锦程季灯平张志霞
Owner BAOSHAN IRON & STEEL CO LTD
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