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A kind of stainless steel for rail transit car body and its preparation method and application

A technology of rail transit and stainless steel, applied in the field of iron and steel metallurgy, can solve the problems that stainless steel cannot meet the requirements, achieve the effect of improving plasticity and toughness, and improving weldability

Active Publication Date: 2019-07-19
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The stainless steel used for the car body puts forward very high requirements on structure, formability, welding performance, plate shape and thickness accuracy, etc., and the existing stainless steel is difficult to meet the requirements

Method used

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  • A kind of stainless steel for rail transit car body and its preparation method and application
  • A kind of stainless steel for rail transit car body and its preparation method and application
  • A kind of stainless steel for rail transit car body and its preparation method and application

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preparation example Construction

[0042] Further, the embodiment of the present invention also provides a method for preparing the above-mentioned stainless steel for rail transit car body, which may include the following steps: smelting C, Si, Mn, P, S, Cr, Ni and Ti in proportion, Then continuous casting, hot rolling, cooling after rolling, annealing and pickling, cold rolling hardening. Rare earth, Cu and Rh are added during continuous casting, and N, Al, Mo and Nb are added during hot rolling.

[0043] According to the processing properties and characteristics of each stage, adding each chemical component into the preparation process step by step can maximize the effect of each chemical component, and through the synergistic effect of each component, it can weaken or avoid some of the components on the steel. Potential adverse effects.

[0044] Preferably, the embodiment of the present invention is accompanied by intermittent electromagnetic stirring during the continuous casting process after smelting, a...

Embodiment 1

[0063] This embodiment provides a kind of stainless steel for rail transit car body, its chemical composition contains 0.03wt% of C, 0.02wt% of Si, 0.8wt% of Mn, 0.01wt% of P, 0.01wt% of S, 15wt% of Cr, 4wt% Ni, 0.04wt% N, 6wt% Mo, 0.02wt% Al, 0.03wt% Ti, 0.005wt% Nb, 0.02wt% Cu, 0.01wt% Rh and 0.2wt% % rare earth, the balance is Fe and unavoidable impurities.

[0064] Among them, the rare earth contains La, Ce, Sm, Tb and Y in a weight ratio of 6:6:2:2:2.

Embodiment 2

[0066] This embodiment provides a kind of stainless steel for rail transit car body, its chemical composition contains 0.06wt% of C, 0.04wt% of Si, 1.2wt% of Mn, 0.02wt% of P, 0.02wt% of S, 20wt% of Cr, 10wt% Ni, 0.08wt% N, 7wt% Mo, 0.03wt% Al, 0.035wt% Ti, 0.008wt% Nb, 0.04wt% Cu, 0.015wt% Rh and 0.5wt% % rare earth, the balance is Fe and unavoidable impurities.

[0067] Among them, the rare earth contains La, Ce, Sm, Tb and Y in a weight ratio of 10:8:3:3:4.

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Abstract

The invention relates to stainless steel for a rail-traffic vehicle body, a preparation method and application thereof and belongs to the technical field of steel and iron metallurgy. The stainless steel is prepared from the chemical components of: C, Si, Mn, P, S, Cr, Ni, N, Mo, Al, Ti, Nb, Cu, Rh, rare earth and the balance of Fe and inevitable impurities. The stainless steel for the rail-traffic vehicle body not only has better extending strength, tensile strength and elongation rate, but also has excellent corrosion resistance simultaneously. The preparation method comprises the followingsteps: carrying out smelting on C, Si, Mn, P, S, Cr, Ni and Ti according to the proportion, then continuously casting, carrying out hot rolling, cooling after rolling, annealing for acid pickling, andcoldly rolling for hardening; the rare earth, Cu and Rh are added in the continuously-casting process, and N, Al, Mo and Nb are added in the hot-rolling process. The preparation method is simple in process, low in cost and easy in process control. After the stainless steel is used for machining the rail-traffic vehicle body, not only can the service life of the vehicle body be prolonged, but alsothe weight of the rail-traffic vehicle body can be reduced.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, and in particular to a stainless steel used for a rail transit car body and a preparation method and application thereof. Background technique [0002] In recent years, domestic urban rail transit has developed rapidly. In order to achieve energy saving, emission reduction, and light weight of the car body, a large number of stainless steels have been used as car body steel. The demand for stainless steel for urban rail vehicle bodies will show an explosive growth trend. The stainless steel used for the car body puts forward very high requirements on structure, formability, welding performance, plate shape and thickness accuracy, etc., and the existing stainless steel is difficult to meet the requirements. [0003] Therefore, it is necessary to develop a steel with excellent performance and moderate price, so as to be suitable for stainless steel in subway car bodies, motor car ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/06C22C38/50C22C38/48C22C38/42C21D8/00C21D1/26
CPCC21D1/26C21D8/005C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50
Inventor 栾道成陈宝书廖力汪思敏王楠
Owner XIHUA UNIV