Hot-rolling double-phase weather-resistant steel plate and mfg. method thereof

Abstract

A hot-rolled dual-phase steel plate with high mechanical performance, cold processibility, weldability and weatherability contains proportionally Fe, C, P and Cu, and is prepared through heating raw plate to 1100-1250 deg.C, hot rolling, cooling to 400-650 deg.C, and winding or fast cooling. Its structure is composed of ferrite and martensite.

Description

technical field

[0001] The invention relates to a metal material with good mechanical properties, cold forming properties, welding properties and weather resistance properties and its manufacturing technology, especially to a metal material with low yield strength, high tensile strength, no discontinuous yield phenomenon, high work hardening index, The uniform deformation elongation and total elongation are large, the comprehensive mechanical properties and weldability are good, and at the same time, it has high weather resistance, and can be hot-rolled to produce a weather-resistant steel plate with a dual-phase structure and a manufacturing method thereof. Background technique

[0002] Weathering steel is a kind of atmospheric corrosion-resistant steel. As far as its composition is concerned, it is a low-carbon low-alloy high-strength steel. Because it contains alloy elements such as Cu and P, it has excellent atmospheric corrosion resistance, that is, weather resistance. ...