Plate shape control method of high-strength steel for commercial vehicle longitudinal beam

Abstract

The invention discloses a plate shape control method of high-strength steel for a longitudinal beam of a commercial vehicle. The plate shape control method comprises the following steps that: 1) a hotblank is charged into a furnace; 2) the plate blank is heated; (3) rough rolling is conducted, specifically, a 1+5 rolling mode is adopted, bending amount of a C-shaped bend or an S-shaped bend in the last pass is controlled within +/-10mm, wedge shape control range is controlled within +/-20[mu]m, and rough rolling finishing temperature is controlled within 1040-1080 DEG C; (4) finish rolling isconducted, specifically, outlets of F1-F4 racks adopt large convexity value control, F5-F7 racks adopt an equal-proportion convexity control mode, and convexity control range of a finished product is0-20[mu]m; 5) layer cooling is conducted, specifically, a front-section ultrafast cooling and rear-section air cooling mode is adopted; 6) slow cooling is conducted, specifically, preheating is conducted in advance in a heat preservation wall, and a steel coil is hoisted into the heat preservation wall for slow cooling; and 7) straightening and flattening are conducted. According to the plate shape control method of the high-strength steel for the longitudinal beam of the commercial vehicle, the high-strength steel for the longitudinal beam of the commercial vehicle prepared is good in apparent plate shape, has no potential plate shape risk, and completely meets the high-standard requirement of a rolling forming process of the high-strength steel for the longitudinal beam of the commercial vehicle on the plate shape.

Description

technical field [0001] The invention relates to a method for controlling the shape of a hot-rolled steel strip, in particular to a method for controlling the shape of a high-strength steel for a commercial vehicle longitudinal beam. Background technique [0002] The lightweight of commercial vehicles is one of the important measures to reduce smog and emissions in the automotive field, which has attracted widespread attention from the whole society. Especially with the release and implementation of GB1589-2016 "External Dimensions, Axle Load and Mass Limits of Automobiles, Trailers and Automobile Trains", people's requirements for high-strength and thinning automotive steel are becoming more and more urgent. [0003] Automobile longitudinal beams are the main load-bearing parts of commercial vehicles, carrying almost all the weight of the goods. Therefore, the quality of steel for automobile longitudinal beams directly affects the driving safety and service life of the vehic...

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Problems solved by technology

[0005] Chinese patent document CN101670372A discloses a method for eliminating shape defects of hot-rolled high-strength steel plates. The process route of temper rolling + bell annealing + roller straightening has achieved good results, but this pro

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