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Tin-containing high-nitrogen martensitic stainless steel alloy material and manufacturing method thereof

A technology of martensitic stainless steel and alloy materials, which is applied in the field of steel alloy materials, can solve the problems of reducing the corrosion resistance of stainless steel, and achieve the effects of low cost, excellent mechanics, and improved corrosion resistance

Inactive Publication Date: 2011-08-24
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, C significantly reduces the corrosion resistance of stainless steel while increasing the Cr content and alloy strength.

Method used

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Experimental program
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Effect test

Embodiment 1

[0012] In this embodiment, the composition and mass percentage of tin-containing high-nitrogen martensitic stainless steel are as follows:

[0013] Cr 13.5%

[0014] N 0.13%

[0015] C 0.025%

[0016] Sn 0.2%

[0017] Si 0.5%

[0018] S 0.005%

[0019] P 0.012%

[0020] Mn 0.8%

[0021] Fe balance

[0022] The traditional conventional smelting process method is adopted, and the Fe60Sn40 master alloy is added in the smelting process. After being melted with comprehensive ingredients, it is poured into shape, and finally a tin-containing high-nitrogen martensitic stainless steel alloy material is obtained. After hot forging, solid solution and tempering treatment in the as-cast state, the tensile breaking strength at room temperature is greater than 800MPa, the yield strength is greater than 500MPa, the elongation at break is greater than 25% and the reduction of area is greater than 50%.

Embodiment 2

[0024] In this embodiment, the composition and mass percentage of tin-containing high-nitrogen martensitic stainless steel are as follows:

[0025] Cr 17.2%

[0026] N 0.17%

[0027] C 0.03%

[0028] Sn 0.4%

[0029] Si 0.6%

[0030] S 0.003%

[0031] P 0.014%

[0032] Mn 0.9%

[0033] Fe balance

[0034] The traditional conventional smelting process method is adopted, and the Fe60Sn40 master alloy is added in the smelting process. After being melted with comprehensive ingredients, it is poured into shape, and finally a tin-containing high-nitrogen martensitic stainless steel alloy material is obtained. After hot forging and solution aging treatment in the as-cast state, the tensile breaking strength at room temperature is greater than 900MPa, the yield strength is greater than 700MPa, the elongation at break is greater than 25% and the reduction of area is greater than 50%.

Embodiment 3

[0036] In this embodiment, the composition and mass percentage of tin-containing high-nitrogen martensitic stainless steel are as follows:

[0037] Cr 17.5%

[0038] Ni 5.0%

[0039] N 0.20%

[0040] C 0.03%

[0041] Sn 0.4%

[0042] Si 0.8%

[0043] Nb 0.1%

[0044] S 0.005%

[0045] P 0.015%

[0046] Mn 0.6%

[0047] Fe balance

[0048] The traditional conventional smelting process method is adopted, and the Fe60Sn40 master alloy is added in the smelting process. After being melted with comprehensive ingredients, it is poured into shape, and finally a super high-nitrogen martensitic stainless steel alloy material is obtained. After hot forging and solution aging treatment in the as-cast state, the tensile breaking strength at room temperature is greater than 900MPa, the yield strength is greater than 700MPa, the elongation at break is greater than 25% and the reduction of area is greater than 50%.

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Abstract

The invention relates to a tin-containing high-nitrogen martensitic stainless steel which is prepared from the following components in percentage by mass: at most 0.04% of C, at most 1.0% of Si, at most 2.0% of Mn, at most 0.02% of P, at most 0.02% of S, 0.05-0.3% of N, 12.0-18.0% of Cr, 0.05-1.0% of Sn, and the balance of Fe and inevitable impurity. The content of tin varies as the content of Cr varies, and the maximum content of tin must be 3.4% less than the content of Cr. The martensitic stainless steel has excellent mechanical properties, favorable corrosion resistance and excellent processability, can be processed into products in various shapes, and is applicable to the fields of general industrial machinery and the like.

Description

technical field [0001] The invention relates to a tin-containing high-nitrogen martensitic stainless steel alloy material and a preparation method thereof, belonging to the technical field of iron and steel alloy materials. Background technique [0002] Traditional martensitic stainless steel usually refers to 410, 420 and 431 grades of stainless steel, the chromium content is about 13% and 17% respectively, and the carbon content generally varies between 0.1-1.0% depending on the chromium content in the steel. Due to the high carbon content of this type of steel, lack of sufficient ductility, it is very sensitive to cracks during forging deformation, and its weldability is relatively poor, so the scope of use is limited. In order to overcome the above shortcomings, since the late 1950s, people have developed a class of ultra-low carbon martensitic stainless steel by reducing the carbon content and increasing the nickel content (3.5-4.5%), which has significantly improved we...

Claims

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Application Information

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IPC IPC(8): C22C38/18C22C38/38C22C33/04
Inventor 肖学山张自兴杨彩雄姜大伟武会利徐裕来李钧林根文
Owner SHANGHAI UNIV
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