A kind of high-strength hot-dip galvanized steel with a tensile strength of 800mpa and its reduction production method

Abstract

The invention relates to hot galvanizing high-strength steel with the tension strength grade of 800MPa and a reduction production method thereof. The hot galvanizing high-strength steel is prepared from the following components: 0.03 to 0.10 percent of C, 1.50 to 2.50 percent of Mn, 0.005 to 0.10 percent of Si, 0.005 to 0.05 percent of Als, 0.10 to 0.25 percent of V, smaller than or equal to 0.015percent of P, smaller than or equal to 0.010 percent of S, smaller than or equal to 0.008 percent of N and 0.0005 to 0.0050 percent of B, and a product microstructure is mainly prepared from 88 to 94percent of ferrite, 3 to 10 percent of bainite and 0 to 9 percent of martensite structure. The production method of the hot galvanizing high-strength steel comprises the following steps: steelmaking,refining, continuous casting and hot rolling, acid pickling, annealing and galvanizing, and finishing. A cold rolling procedure of a traditional production technological process is omitted, the production process is remarkably shortened, the energy consumption and the CO2 emission during the production process are greatly reduced, and the production efficiency is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of hot-dip galvanized ultra-high-strength steel manufacturing, and relates to a hot-dip galvanized high-strength steel with a tensile strength of 800 MPa and a reduction production method thereof. Background technique [0002] In recent years, in order to reduce energy consumption during the use of automobiles and reduce CO 2 Emissions, automotive steel, etc. are developing in the direction of thinner thickness specifications and higher strength, and ultra-high-strength steel of 800MPa level and above is one of the main development directions. Compared with ordinary cold-rolled high-strength steel, galvanized high-strength steel not only has high strength, but also has good corrosion resistance. Therefore, galvanized ultra-high-strength steel above 800MPa has been widely used, mainly for door anti-collision beams, longitudinal Manufacture of automotive structural parts such as beam reinforcement plates and ...

AI Technical Summary

Problems solved by technology

The current manufacturing process of hot-dip galvanized high-strength steel products with a tensile strength of 800 MPa generally involves steelmaking→continuous casting→hot rolling→pickling→cold rolling→annealing and galvanizing, etc. The manufacturing process is relatively long, resulting in energy consumption increase, CO 2 In addition, due to the high alloy content in 800MPa high-strength steel, it is difficult to roll during cold rolling, and the load of cold rolling rolling equipment is large, and there are problems such as difficult control of plate shape and rolling edge cracking.