Stainless steel for security doors and heat treatment method of stainless steel

A heat treatment method and stainless steel technology, which is applied in the field of stainless steel and its heat treatment, can solve the problems of fracture, low-temperature toughness of stainless steel, etc., and achieve the effect of improving corrosion resistance and improving steel strength

Inactive Publication Date: 2015-04-29
SUZHOU JIN YUAN OIL MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, most of the metal doors and windows are made of stainless steel. The stainless steel used for metal doors and windows needs to have strong anti-corrosion performance and unique stainless steel luster. The thermal insulation performance needs to be better than ordinary steel with the same structure. The technical requirements of stainless steel are also constantly improving, which requires sufficient transverse yield strength and corrosion resistance; and in some cold regions, the low-temperature toughness of stainless steel is not high, and it often leads to fracture in a short time

Method used

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  • Stainless steel for security doors and heat treatment method of stainless steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] This embodiment is a stainless steel used for anti-theft doors. The composition and mass percentage of the stainless steel are: C: 0.08%, Mn: 1.21%, Si: 0.14%, P: 0.003%, S: 0.001%, Mg: 0.093 %, V: 0.06%, Ti: 1.8%, Al: 1.5%, Cu: 0.05%, Cr: 23.7%, Ni: 16.5%, Mo: 0.25%, lanthanide rare earth elements 0.12%, the balance is Fe and not Impurities to avoid;

[0046] Wherein the chemical composition mass percentage content of lanthanide is: Nd: 13%, Ce: 11%, Er: 8%, Pr: 6%, Pm: Dy: 1%, the balance is La;

[0047] In the stainless steel for anti-theft doors, the number density of carbides is greater than 0.9 pieces / μm 2 , the ratio of the number of coarse carbides with a particle size of 0.4 μm or more to the carbides is less than 0.1; the corrosion resistance of the corrosion-resistant steel for the window frame is ≤0.004 mm / years, and the corrosion resistance is ≤0.005 mm / year under alkaline conditions with a pH value of 7~10.

[0048] The aforementioned heat treatment me...

Embodiment 2

[0055] This embodiment is a stainless steel used for anti-theft doors. The composition and mass percentage of the stainless steel are: C: 0.10%, Mn: 1.25%, Si: 0.15%, P: 0.004%, S: 0.001%, Mg: 0.094 %, V: 0.06%, Ti: 1.9%, Al: 1.7%, Cu: 0.06%, Cr: 23.8%, Ni: 16.6%, Mo: 0.24%, lanthanide rare earth elements 0.16%, the balance is Fe and not Impurities to avoid;

[0056] Wherein the chemical composition mass percentage of lanthanide elements is: Nd: 15%, Ce: 15%, Er: 11%, Pr: 6%, Pm: 1%, and the balance is La;

[0057] In the stainless steel for anti-theft doors, the number density of carbides is greater than 0.9 pieces / μm 2 , the ratio of the number of coarse carbides with a particle size of 0.4 μm or more to the carbides is less than 0.1; the corrosion resistance of the corrosion-resistant steel for the window frame is ≤0.004 mm / years, and the corrosion resistance is ≤0.005 mm / year under alkaline conditions with a pH value of 7~10.

[0058] The aforementioned heat treatment ...

Embodiment 3

[0065] This embodiment is a stainless steel used for anti-theft doors. The composition and mass percentage of the stainless steel are: C: 0.11%, Mn: 1.29%, Si: 0.16%, P: 0.005%, S: 0.002%, Mg: 0.095 %, V: 0.06%, Ti: 1.8%, Al: 1.7%, Cu: 0.05%, Cr: 23.9%, Ni: 16.7%, Mo: 0.25%, lanthanide rare earth elements 0.18%, the balance is Fe and not Impurities to avoid;

[0066] Wherein the chemical composition mass percentage of lanthanides is: Nd: 17%, Ce: 18%, Er: 14%, Pr: 9%, Pm: 4%, Dy: 2%, and the balance is La;

[0067] In the stainless steel for anti-theft doors, the number density of carbides is greater than 0.9 pieces / μm 2 , the ratio of the number of coarse carbides with a particle size of 0.4 μm or more to the carbides is less than 0.1; the corrosion resistance of the corrosion-resistant steel for the window frame is ≤0.004 mm / years, and the corrosion resistance is ≤0.005 mm / year under alkaline conditions with a pH value of 7~10.

[0068] The aforementioned heat treatment ...

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Abstract

The invention provides a stainless steel for security doors. The stainless steel is prepared from such components as 0.08-0.11% of C, 1.21-1.29% of Mn, 0.14-0.16% of Si, 0.003-0.005% of P, 0.001-0.002% of S, 0.093-0.095% of Mg, 0.06-0.08% of V, 1.8-2.1% of Ti, 1.5-1.7% of Al, 0.05-0.07% of Cu, 23.7-23.9% of Cr, 16.5-16.7% of Ni, 0.23%-0.25% of Mo, 0.12-0.18% of lanthanide rare-earth element, and the balance of Fe and inevitable impurities. The stainless steel has strong corrosion resistance, high transverse yield strength and excellent low-temperature toughness.

Description

technical field [0001] The invention relates to a stainless steel and a heat treatment method thereof, in particular to a stainless steel used for anti-theft doors and a heat treatment method thereof. Background technique [0002] At present, most of the metal doors and windows are made of stainless steel. It is required that the stainless steel used for metal doors and windows must have strong anti-corrosion performance and unique stainless steel luster. The thermal insulation performance must be better than that of ordinary steel with the same structure. The technical requirements of stainless steel are also constantly improving, requiring sufficient transverse yield strength and corrosion resistance; and in some cold regions, stainless steel has low low-temperature toughness, which often leads to fracture in a short period of time. Therefore, how to effectively improve the transverse yield strength, corrosion resistance and low-temperature toughness of stainless steel for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C21D6/00C21D1/25C21D1/28
Inventor 黄龙海黄瑶琼吴磊
Owner SUZHOU JIN YUAN OIL MACHINERY
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