Low-cost high-strength low nickel austenitic stainless steel and manufacturing method thereof

A technology of austenitic stainless steel and a manufacturing method, which is applied in the field of low-cost and high-strength nickel-saving austenitic stainless steel and manufacturing, can solve problems such as delayed cracking of materials, prolong life, save electrophoresis and coating, and be beneficial to the environment protective effect

Inactive Publication Date: 2019-01-01
BAOSTEEL DESHENG STAINLESS STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] In summary, all of the above patents are nickel-saving austenitic stainless steels. Except for the high-manganese steel disclosed in 201580016940.2, which induces plasticity through deformation twins, the nickel-saving austenitic stainless steels in other patents are ...

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  • Low-cost high-strength low nickel austenitic stainless steel and manufacturing method thereof
  • Low-cost high-strength low nickel austenitic stainless steel and manufacturing method thereof
  • Low-cost high-strength low nickel austenitic stainless steel and manufacturing method thereof

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Embodiment Construction

[0051] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0052] The composition of the nickel-saving austenitic stainless steel embodiment of the present invention is shown in Table 1, and the balance is Fe and unavoidable impurities; the corresponding manufacturing process parameters are shown in Table 2, and the properties of the stainless steel of the embodiment are shown in Table 3.

[0053] figure 1 It is the metallographic structure of the finished steel plate in Example 2 of the present invention: austenite + AlN (black dots) + martensite (trace amount).

[0054] From figure 1 It can be seen that under 10% deformation, the grains in the steel hardly deform, the grains are fine, the martensite content in the steel is small, and it is almost invisible, but it can be obtained by measuring the magnetic phase, see Table 2, And a large number of AlN (black dots) dispersed in the matrix, play a strengthenin...

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Abstract

The invention relates to a low-cost high-strength stainless steel and a manufacturing method thereof. The stainless steel comprises the following the chemical components by weight percentage: 0.05-0.15% of C, 0.2-1.0% of Si, 7-12% of Mn, 14-16% of Cr, 1. 0 to 2.0% of Ni, less than or equal to 0.045% of P, less than or equal to 0.02% of S, 0.1-0.2% of N, 1.0-2.0% of Cu, and 0.05-0.2% of Al, and thebalance of Fe and inevitable impurities. By adding an Al element and controlling the content of Al in the steel, and under small deformation variable, only a small amount of martensite is induced when the steel is subjected to deformation (the formation of a large amount of martensite increases the delayed cracking sensitivity of the steel), high plasticity and elongation percentage can achieve more than 30%, and due to three effects of the precipitation strengthening of AlN and the deformation strengthening and phase-transformation strengthening of steel, the yield strength of steel is morethan 800 MPa, and the tensile strength is above 1000 MPa, the stainless steel meets the requirements of high strength and high plasticity of an automobile frame and an automobile beam steel and structural parts, and achieves the objects of lightweight, high safety performance and high corrosion resistance of automobiles.

Description

technical field [0001] The present invention relates to austenitic stainless steel and a manufacturing method, in particular to a low-cost high-strength nickel-saving austenitic stainless steel and a manufacturing method. The austenitic stainless steel has a yield strength of more than 800 MPa, a tensile strength of more than 1000 MPa, and high plasticity. The elongation rate reaches more than 30%, and it can be used in auto parts, especially suitable for bus frame, auto girder and other structural parts. Background technique [0002] Environmental pollution affects health, and automobile emissions have become one of the main sources of air pollution. Therefore, countries around the world have introduced stricter vehicle emission standards. Automobile lightweight can improve vehicle power, reduce fuel consumption, and reduce emissions. Therefore, automobile lightweight has become the world's automotive technology. One of the important directions of development. Lightweight ...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/42C22C38/02C22C38/06C21D8/02
CPCC21D8/0226C21D8/0236C21D8/0263C21D2211/001C21D2211/004C21D2211/008C22C38/001C22C38/02C22C38/06C22C38/42C22C38/58
Inventor 常鍔熊林敞毕洪运余海峰许海刚
Owner BAOSTEEL DESHENG STAINLESS STEEL
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