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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AI-Extracted 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 a...
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Method used

The method for improving economical duplex stainless steel sheet strength of the present invention, from the preparation of economical duplex stainless steel hot coil, the first cold rolling of coil after solution treatment, cold rolling thickness and subsequent solution treatment, final cold working The rational design of key processes and parameters such as strengthening deformation rate, unit rolling force, leveling deformation, and tensile straightening force finally realized the stable manufacturing of economical duplex stainless steel plates with high strengthening, satisfying Rp0.2≥630MPa, elongation Reasonable match of A50≥20%.
The present invention carries out the first solid solution treatment by the hot-rolled coil plate of duplex stainless steel according to above-mentioned process, reaches the reasonable matching of hot-rolled strip steel ferrite ratio close to 50% and strip strength at 570-590MPa, is follow-up The finished product has good organizational properties to provide a guarantee.
The present invention is by carryin...
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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.

Technology Topic

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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(2)
  • Comparison scheme(2)

Example Embodiment

[0070] Example 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 product performance: Rp 0.2 =690-695MPa, Rm=840-850MPa, A 50 = 24-26%.

Example Embodiment

[0079] Example 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 product performance: Rp 0.2 =675-680MPa, Rm=850-855MPa, A 50 = 26-25%.
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PUM

PropertyMeasurementUnit
Thickness2.5mm
Thickness2.45mm
Thickness1.6mm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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