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Fine processing property soft stainless steel

A kind of stainless steel plate, processability technology, applied in the field of soft stainless steel plate

Inactive Publication Date: 2002-11-20
NIPPON STEEL STAINLESS STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the demand for stainless steel performance, including forging die life improvement, has become more and more intense due to the use of severe forging conditions

Method used

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  • Fine processing property soft stainless steel
  • Fine processing property soft stainless steel
  • Fine processing property soft stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Various stainless steels having the compositions shown in Table 1 were refined, continuously cast into slabs, and hot rolled to a thickness of 3 mm at an extraction temperature of 1230°C. The hot-rolled steel strip was annealed at 1150° C. for 1 minute, pickled, and then cold-rolled to a thickness of 0.4 mm. Then, the cold-rolled steel strip was annealed at 1050° C. for 1 minute, and pickled again.

[0069] The various cold-rolled steel strips produced in this way had the mechanical properties shown in Table 2.

[0070] Cut blanks with a diameter of 74mm from various stainless steel plates, and use a cylindrical punch with a diameter of 33mm with a punch radius of 3mm and a die with a diameter of 35mm with a die radius of 3mm to hold the pressure of 1 ton to a height of 7mm. . Then as Figure 4 As shown, an opening with a diameter of 10 mm was formed in the center of the rolled billet, and then a spherical punch with a diameter of 35 mm and a diameter of 35 mm with a...

Embodiment 2

[0081] Various stainless steels having the compositions shown in Table 5 were refined, continuously cast into slabs, and hot rolled to a thickness of 3 mm at an extraction temperature of 1230°C. After hot rolling, the steel strip was annealed at 1150 °C for 1 minute, pickled and cold rolled to a thickness of 0.4 mm. Thereafter, the cold-rolled strip was final annealed at 1050° C. for 1 minute and pickled again.

[0082] The blanks sheared from various steel strips were observed by microscopy and the SiO of precipitated non-metallic inclusions in the matrix was measured by EPMA analysis 2 and Al 2 o 3 concentration. Results and the austenite stability index Md 30 It is shown in Table 6 together with the stacking fault formability index SFI. The copper concentration in the precipitate measured by EDX analysis in the field of TEM is also shown in Table 6. Table 7 on the other hand shows the mechanical properties of various stainless steel plates.

[0083] Cut blanks with a...

Embodiment 3

[0092] Various stainless steels having the compositions shown in Table 9 were refined, continuously cast into slabs, and hot rolled to a thickness of 5 mm at an extraction temperature of 1230°C. After the hot-rolled steel strip was annealed at 1100°C for 1 minute, it was pickled.

[0093] Columnar test block samples having an outer diameter of 3.0 mm and a height of 4 mm were taken from each stainless steel plate. In order to investigate the relationship between true strain and true stress during compression deformation, the test block was compressed along the axial direction of the column at a strain rate of 0.01 / sec.

[0094] Table 10 shows the value of the true stress when the true strain becomes 1 under the time period when the height of each test block is reduced by 60% compared to the original height. It can be appreciated that steels A and B of the present invention exhibit resistance to deformation (as represented by true stress) of less than 1200 MPa, whereas the def...

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Abstract

A new soft stainless steel plate has an austenite stability index Md30 controlled in the range of -120 to -10 and a stacking fault formability index SFI controlled at not less than 30, and contains a Cu concentration controlled at Precipitation not greater than 1.0% is used to maintain the dissolved Cu concentration at 1-5%. The stainless steel plate preferably contains up to 0.06% (C+N), up to 2.0% Si, up to 5% Mn, 15-20% Cr, 5-9% Ni, 1.0-4.0% Cu, up to 0.003% Al, up to 0.005% S and optionally up to 0.5% Ti, up to 0.5% Nb, up to 0.5% Zr, up to 0.5% V, up to 3.0% One or more of Mo, up to 0.03% B, up to 0.02% REM (rare earth metal) and up to 0.03% Ca. The stainless steel plate can be plastically deformed into the intended shape by multi-stage deep rolling or compression deformation, and there is no crack even in the severe processing part. Md30(℃)=551-462(C+N)-9.2Si-8.1Mn-29(Ni+Cu)-13.7Cr-18.5MoSFI(mJ / m2)=2.2Ni+6Cu-1.1Cr-13Si-1.2Mn +32

Description

technical field [0001] The present invention relates to a soft stainless steel sheet which can be formed into an intended shape with high dimensional accuracy and without cracking even by severe or multistage deep rolling or cold forging. Background technique [0002] Stainless steel with excellent corrosion resistance has been extended to various fields such as use under environmental deterioration. For example figure 1 As shown, a hydraulic pump component that is often exposed to a humid atmosphere is formed by cutting a stainless steel plate 1 into a predetermined size, rolling and stamping the cut plate 1, piercing the stamped plate 1, and widening the hem to form the A perforated plate 1 is produced by expanding a perforated portion 2 into an expanded edge 3 . [0003] Austenitic stainless steel, such as SUS304, is a material whose workability is much better than that of ferritic stainless steel. However, when austenitic stainless steel passes through such as figure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/04C22C38/00C22C38/42C22C38/44C22C38/58
CPCC21D8/04C21D8/0405C21D8/0463C21D8/0473C22C38/001C22C38/004C22C38/42C22C38/44C22C38/58
Inventor 石川半二大塚雅人铃木聪田中秀记香月淳一山内隆平松直人
Owner NIPPON STEEL STAINLESS STEEL CORP
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