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Economical duplex stainless steel plate, method for improving strength of economical duplex stainless steel plate and application of economical duplex stainless steel plate

A duplex stainless steel, economical technology, applied in the field of economical duplex stainless steel sheets, can solve the problems of a large number of input personnel, complex vehicle manufacturing processes, and high life cycle costs, reducing maintenance, reducing energy consumption, and reducing vehicle body. weight reduction effect

Pending Publication Date: 2022-08-02
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the field of urban transportation, the traditional car body structure is made of galvanized low-carbon steel to make hollow section profiles, and the yield strength of the material Rp 0.2 ≥345MPa, and the wall thickness exceeds 3.0mm. Due to the need for galvanizing, the anti-corrosion problem of the material cannot be solved essentially. Therefore, the vehicle manufacturing process is complicated, the number of personnel invested is large, and the maintenance cost during use is high, resulting in a relatively high life cycle cost of the vehicle. high

Method used

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  • Economical duplex stainless steel plate, method for improving strength of economical duplex stainless steel plate and application of economical duplex stainless steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] The chemical composition of economical duplex stainless steel (21%Cr-5%Mn-1.5%Ni-0.3%Mo-N) is as follows:

[0072] C: 0.020% Si: 0.62% Mn: 5.14% P: 0.021% S: 0.001% Cr: 21.53% Ni: 1.53% Mo: 0.20% N: 0.21% The rest are iron and inevitable impurities.

[0073] ·Hot coil preparation: The hot-rolled coil with "thickness*width" of 6.0*1219mm undergoes solution treatment at 1000-1040℃, and is water-cooled. The running speed of the strip is 13-15m / min.

[0074] Coil cold rolling and solution treatment: the target thickness of cold rolling is controlled at 2.7mm; solution treatment system: heating furnace temperature 1000-1040℃, strip running speed 20-25m / min

[0075] ·Cold working strengthening: single pass rolling, cold deformation rate 3.5%, rolling force 25kN / cm; coils are degreased.

[0076] ·Flattening and straightening packaging: 1% of flattening deformation, 600Kg of straightening force.

[0077] The thickness of the finished product is 2.5mm.

[0078] Finished produ...

Embodiment 2

[0080] The chemical composition of economical duplex stainless steel (21%Cr-5%Mn-1.5%Ni-0.3%Mo-N) is as follows:

[0081] C: 0.013% Si: 0.55% Mn: 5.10% P: 0.020% S: 0.002% Cr: 21.47% Ni: 1.56% Mo: 0.21% N: 0.20% The rest is iron and inevitable impurities.

[0082] ·Hot coil preparation: The hot-rolled coil with "thickness*width" of 5.0*1219mm undergoes solution treatment at 1000-1040℃, and is water-cooled. The running speed of the strip is 14-15m / min.

[0083] ·Coil cold rolling and solution treatment: the target thickness of cold rolling is controlled at 2.6mm; solution treatment system: heating furnace temperature 1000-1040℃, strip running speed 20-25m / min

[0084] ·Cold working strengthening: single pass rolling, cold deformation rate 3.0%, rolling force 24kN / cm; coils are degreased.

[0085] · Flattening and straightening packaging: 1% of flattening deformation, 500Kg of straightening force.

[0086] The thickness of the finished product is 2.5mm.

[0087] Finished prod...

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Abstract

The invention belongs to the field of special stainless steel variety development and application, and particularly relates to an economical duplex stainless steel plate, a method for improving the strength of the economical duplex stainless steel plate and application of the economical duplex stainless steel plate. The method for improving the strength of the economical duplex stainless steel plate comprises the following steps: (1) carrying out first solution treatment on a duplex stainless steel hot-rolled coiled plate, and carrying out water cooling after discharging; (2) after cold rolling to a target thickness, carrying out second solution treatment; (3) the duplex stainless steel is strengthened through cold machining; and (4) the economical duplex stainless steel plate product is obtained through flattening and withdrawal and straightening. According to the method, further high strengthening of the economical duplex stainless steel cold plate is achieved, meanwhile, the strength and the ductility of a finished product are reasonably matched (Rp0.2 is larger than or equal to 630 MPa, and the ductility A50 is larger than or equal to 20%), and an ideal stainless steel material solution is provided for light weight of a vehicle body bearing structure.

Description

technical field [0001] The invention belongs to the field of development and application of special stainless steel varieties, and in particular relates to an economical duplex stainless steel plate, a method for improving its strength and its application. Background technique [0002] From the analysis of the global long-term development of stainless steel, high-performance and resource-saving stainless steel represented by duplex stainless steel has become one of the main development trends. Features such as high strength, light weight, long life, and low alloy cost have become the mainstay of design and manufacturing. Important reference. [0003] In the field of urban traffic, the traditional car body structure is made of galvanized low carbon steel to make hollow section profiles. The yield strength of the material is Rp 0.2 ≥345MPa, and the wall thickness exceeds 3.0mm. Due to the need for galvanizing, the corrosion resistance of the material cannot be solved in essen...

Claims

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Application Information

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IPC IPC(8): C21D8/02C22C38/02C22C38/58C22C38/44
CPCC21D8/0205C21D8/0236C21D8/0242C21D8/0268C22C38/02C22C38/58C22C38/44C22C38/001C21D2211/005C21D2211/001
Inventor 李国平裴明德秦宇航梁祥祥
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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