Super high nitrogen martensite stainless steel and preparation method thereof

A martensitic stainless steel, stainless steel technology, applied in the field of steel alloy materials, can solve problems such as reducing the corrosion resistance of stainless steel

Inactive Publication Date: 2011-07-27
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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] In this embodiment, the composition and mass percentage of super martensitic stainless steel are as follows:

[0013] Cr 17.7%

[0014] Ni 4.0%

[0015] N 0.18%

[0016] C 0.025%

[0017] Cu 3.8%

[0018] Rare earth Ce 0.105%

[0019] Si 0.7%

[0020] S 0.005%

[0021] P 0.013%

[0022] B 0.003%

[0023] Fe margin

[0024] Adopting traditional conventional smelting process method, after comprehensive batching melting, casting molding, and finally making super high nitrogen martensitic stainless steel alloy material. After hot forging and solution aging treatment in the as-cast state, the room temperature tensile breaking strength is greater than 1300MPa, the yield strength is greater than 1250MPa, the hardness is greater than 42HRC, and the elongation at break is greater than 20%.

Embodiment 2

[0026] In this embodiment, the composition and mass percentage of super martensitic stainless steel are as follows:

[0027] Cr 16.5%

[0028] Ni 3.8%

[0029] N 0.21%

[0030] C 0.025%

[0031] Cu 4.2%

[0032] Rare earth Ce 0.1%

[0033] Si 0.8%

[0034] S 0.005%

[0035] P 0.015%

[0036] B 0.002%

[0037] Fe margin

[0038] Adopting traditional conventional smelting process method, after comprehensive batching melting, casting molding, and finally making super high nitrogen martensitic stainless steel alloy material. After hot forging and solution aging treatment in the as-cast state, the room temperature tensile breaking strength is greater than 1250MPa, the yield strength is greater than 1200MPa, the hardness is greater than 40HRC, and the elongation at break is greater than 20%.

[0039] The mechanical properties of this type of material are equivalent to 17-4PH martensitic precipitation hardening stainless steel, and its corrosion resistance is significantly better than that of 17-4PH ...

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Abstract

The invention relates to a super high nitrogen martensite stainless steel and a preparation method thereof, belonging to the technical field of steel alloy material. The super high nitrogen martensite stainless steel comprises the components by mass percent: less than or equal to 0.03% of C, less than or equal to 0.01% of S, less than or equal to 1.0% of Si, less than or equal to 0.015% of P, 16-18% of Cr, 3.4-4.5% of Ni, 3.5-4.5% of Cu, 0.15-0.25% of N, 0.001-0.01% of B, 0.005-0.20% of rare earth Ce or Y and the balance of Fe. The traditional smelting technique method is adopted and comprises the steps of: adding Fe-Ce or Fe-Y intermediate alloy in the smelting process, pouring for moulding, carrying out solution treatment within the temperature range of 950-1200 DEG C after hot forging, forming martensite structure, and finally carrying out ageing treatment. Therefore, at the room temperature, the super high nitrogen martensite stainless steel has the tensile break strength within the range of 1290-1450MPa, the yield strength within the range of 1150-1350MPa, the elongation at break within the range of 18-28% and the reduction of cross section within the range of 50-65%.

Description

technical field [0001] The invention relates to a super high-nitrogen martensitic stainless steel and a preparation method thereof, belonging to the technical field of iron and steel alloy materials. Background technique [0002] Maraging stainless steel is a high-strength stainless steel superimposed by low-carbon martensitic transformation strengthening and aging strengthening effects. It is a new type of steel developed in the late 1960s. It has all the advantages of maraging steel, but also has the stainless property that maraging steel does not have, and also improves some properties of precipitation hardening stainless steel. Therefore, the gradual replacement of precipitation-hardened stainless steel with maraging stainless steel is an important trend in the development of high-strength stainless steel, and it is the most promising steel grade for ultra-high-strength stainless steel. It has been widely used in aviation, aerospace, machinery manufacturing, atomic ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C22C33/06
Inventor 肖学山马正欢张莉芬聂恒龙门
Owner SHANGHAI UNIV
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