A kind of high-strength and high-plasticity stainless steel composite plate and its manufacturing method

Abstract

A high-strength and high-plasticity stainless steel composite board and its manufacturing method. The composite board includes a substrate and a composite board. The substrate is integrally and continuously covered with the composite board on one or both sides. The mass percentage of the chemical composition of the substrate is: C: 0.03~ 0.10%, Si: 0.2-1.0%, Mn: 6.0-8.5%, Cr: 16.0-18.0%, Ni: 1.5-3.0%, Mo: 0.1-0.5%, Cu: 1.5-3.0%, N: 0.10-0.25 %, P: 0.005-0.40%, S: 0.001-0.01%, the rest is Fe and unavoidable impurities; the doubler plate is 316L stainless steel, and the composition of the base plate and doubler plate requires M d30 / 50 (α')≤20°C. The room temperature tensile strength of the composite plate manufactured by the present invention is ≥650MPa, the elongation rate is ≥50%, the impact energy at ‑196°C is ≥27J, and the deformation amount is ≤20%. The composite plate has high strength and high corrosion resistance. At the same time, it has excellent plasticity, toughness and processing performance. It can replace 316L stainless steel and be used in manufacturing fields such as tank containers.

Description

technical field [0001] The invention relates to a stainless steel composite plate, in particular to a high-strength and high-plasticity stainless steel composite plate and a manufacturing method thereof. Background technique [0002] Stainless steel clad steel plate is a bimetallic high-efficiency energy-saving material that uses carbon steel or stainless steel as a matrix and is integrally and continuously coated with stainless steel on one or both sides. It gives full play to the advantages of the characteristics of the base layer and the clad layer material. It not only has the corrosion resistance or wear resistance of the clad layer material, but also has the good mechanical and forming properties of the base material, so it is a multifunctional material. [0003] The composite of stainless steel and high-strength steel is an effective method to improve the strength of materials and save the cost of use. In particular, the composite plate of 300 series austenitic stainl...

AI Technical Summary

Problems solved by technology

However, the composite of stainless steel and carbon steel has some disadvantages: when carbon steel and stainless steel are composited on one side, the thermal processing performance of carbon steel and stainless steel is too different, and the thermal processing process is difficult; one side of carbon steel has poor atmospheric corrosion resistance and often needs to be painted , and may require frequent maintenance, increasing the cost of use; due to the carbon steel layer, the anti-corrosion treatment of the composite plate cross-section is more troublesome, and the weld metal has poor corrosion resistance due to the dilution of the components of the carbon steel substrate during welding, etc.

[0005] Using standard 201 or 202 series stainless steel as the substrate, the room temperature tensile strength of the composite plate is low, and the nickel content is often above 4%, the cost of raw materials is high, and there is no good economy; the use of non-standard 1% nickel content About 200 series stainless steel, because the nickel content is too low, low temperature impact toughness cannot be guaranteed

In short, it is difficult to find a conventional Cr-Mn-N series stainless steel as a substrate to meet the technical requirements of the above clad plate

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