High-strength and high-plasticity stainless steel composite plate and manufacturing method thereof

Abstract

The invention discloses a high-strength and high-plasticity stainless steel composite plate and a manufacturing method thereof. The composite plate comprises a substrate and a compound plate; the single surface or double surfaces of the substrate is totally and continuously coated with the compound plate; the substrate comprises the following chemical components in percentage by mass: 0.03-0.10% of C, 0.2-1.0% of Si, 6.0-8.5% of Mn, 16.0-18.0% of Cr, 1.5-3.0% of Ni, 0.1-0.5% of Mo, 1.5-3.0% of Cu, 0.10-0.25% of N, 0.005-0.40% of P, 0.001-0.01% of S, and the balance of Fe and inevitable impurities; the compound plate is 316L stainless steel; and the components of the substrate and the compound plate both request that Md30 / 50(alpha') is not more than 20 DEG C. The manufactured composite plate has no magnetism in room-temperature cold working process of the room-temperature tensile strength of not less than 650 MPa, the ductility of not less than 50%, -196 DEG C impact power of not less than 27 J and deformation of not more than 20%, is high in strength and corrosion resistance, is excellent in plastic toughness and machining performance, can replace the 316L stainless steel, and is applied to such manufacturing fields 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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