A low-nickel austenitic stainless steel

An austenitic stainless steel, mass percentage technology, applied in the field of metallurgy, can solve the problems of more effective utilization of unfavorable resources, low strength, high nickel content, reduce intergranular corrosion sensitivity, improve tensile strength at room temperature, and improve resistance to corrosion. The effect of pitting performance

Inactive Publication Date: 2016-06-08
SICHUAN FAST STAINLESS STEEL CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the lower strength (generally around 500MPa) and yield strength (generally around 250-300MPa) make the parts must rely on larger wall thickness or stress area to achieve the design desire, making the product often larger and more Heavy, not only takes up space and transportation capacity, but also has a higher total cost
[0004] The nickel content in the material is relatively high, and the nickel element reaching more than 8% is a great waste, which is not conducive to the more effective use of resources

Method used

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  • A low-nickel austenitic stainless steel
  • A low-nickel austenitic stainless steel
  • A low-nickel austenitic stainless steel

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The low-nickel austenitic stainless steel having the chemical composition shown in 1-1 in Table 1 was melted in an electric furnace, and formed by hot forging and hot rolling. Then, heat treatment was carried out by heating to 1200° C., followed by water cooling, and then a steel plate with a thickness of 20 mm, a width of 50 mm, and a length of 100 mm was produced by machining.

[0041] In addition, 1-1 in Table 1 is the steel whose chemical composition falls within the range prescribed|regulated by this invention.

[0042] On the other hand, 2-1 is the conventional 304 stainless steel of the comparative example outside the conditions prescribed|regulated by this invention.

Embodiment 2

[0046] The low-nickel austenitic stainless steel with the chemical composition shown in 1-2 in Table 1 was melted in an electric furnace, and formed by hot forging and hot rolling. Then, heat treatment was carried out by heating to 1200° C., followed by water cooling, and then a steel plate with a thickness of 20 mm, a width of 50 mm, and a length of 100 mm was produced by machining.

[0047] In addition, 1-2 in Table 1 is the steel whose chemical composition falls within the range prescribed|regulated by this invention.

[0048] On the other hand, 2-2 is the conventional 304 stainless steel of the comparative example outside the conditions prescribed|regulated by this invention.

Embodiment 3

[0052] The low-nickel austenitic stainless steel with the chemical composition shown in 1-3 in Table 1 was melted in an electric furnace, and formed by hot forging and hot rolling. Then, heat treatment was carried out by heating to 1200° C., followed by water cooling, and then a steel plate with a thickness of 20 mm, a width of 50 mm, and a length of 100 mm was produced by machining.

[0053] In addition, 1-3 in Table 1 is the steel whose chemical composition falls within the range prescribed|regulated by this invention.

[0054] On the other hand, 2-3 is the conventional 304 stainless steel of the comparative example outside the conditions prescribed|regulated by this invention.

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Abstract

The invention relates to the field of metallurgy and particularly relates to low-nickel austenitic stainless steel. The low-nickel austenitic stainless steel comprises the following components in percentage by weight: less than 0.08% of C, less than 1.0% of Si, less than 1.5% of Mn, 5-8% of Ni, 18-21% of Cr, 0.08-0.15% of N, less than 0.1% of Al, less than 0.045% of P, less than 0.04% of S and the balance of Fe. Compared with existing materials, the low-nickel austenitic stainless steel has the following advantages of the tensile strength and the creep strength at normal temperature are improved by about 80MPa; moreover, the intergranular corrosion sensitivity is further reduced, and the corrosion resistance is improved, particularly the point corrosion resistance is improved. The content of nickel in the material is reduced by over 35%, waste of nickel is reduced, and sources are more effectively utilized.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a low-nickel austenitic stainless steel. Background technique [0002] A large number of 18-8 series austenitic stainless steel represented by 304 accounts for more than 70% of the world's total stainless steel production. This austenitic stainless steel has good oxidation resistance, corrosion resistance of acid medium, and is nonmagnetic. High toughness and plasticity. This kind of stainless steel mainly uses a relatively high content of Cr element to ensure the corrosion resistance of the material itself. The lower C element avoids the intergranular corrosion caused by the chromium-poor layer caused by chromium carbide, and it is formed by a certain amount of nickel element. Stable austenite structure; generally the carbon content is below 1.5%, the chromium element is above 18%, and the nickel element is above 8%. [0003] However, the lower strength (generally around 500MPa) and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/40
Inventor 李伟周凯文曾光前吴枝峰
Owner SICHUAN FAST STAINLESS STEEL CASTING
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