A kind of 700mpa grade cold-rolled corrosion-resistant dual-phase steel and its manufacturing method

Abstract

The invention discloses a 700 MPa cold-rolled corrosion-resistant dual-phase steel and a manufacturing method thereof. The 700 MPa cold-rolled corrosion-resistant dual-phase steel contains 0.080%-0.095% of C, less than 0.10% of Si, 1.41%-1.69% of Mn, less than or equal to 0.018% of P, less than or equal to 0.006% of S, 0.015%-0.045% of Als, 0.51%-0.99% of Cr, 0.11%-0.19% of Ni, 0.29%-0.46% of Cu,0.031%-0.049% of Nb, 0.017%-0.042% of Ti, 0.051%-0.119% of Sb, 0.037%-0.089% of Sn, 0.11%-0.19% of Mo, 0.0008%-0.0019% of B, 0.0008%-0.0030% of Ca, and the balance of Fe and inevitable impurities. Themanufacturing method comprises the following steps: heating a plate blank which is 135-170 mm to 1228-1249 DEG C, performing rough rolling at the temperature higher than 1100 DEG C, performing finishrolling at the temperature of 905-945 DEG C, annealing at the temperature of 815-845 DEG C, and tempering at the temperature of 350 to 380 DEG C. A steel plate is high in sulfuric acid and chloridioncorrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of high-strength cold-rolled dual-phase steel production, and in particular relates to a cold-rolled dual-phase steel with corrosion resistance used for railway vehicles, containers and the like and a manufacturing method thereof. Background technique [0002] For transportation structures, there is an urgent need for lightweight containers to increase the weight of goods that can be transported at a time, and materials such as stainless steel or aluminum alloys have been used to manufacture lightweight containers or railway vehicles and extend their life. However, due to their high production costs, their applications are limited. However, the corrosion resistance of existing cold-rolled steel sheets cannot fully meet the requirements for use. In order to meet the needs of steel plate thinning, the development of ultra-high-strength cold-rolled corrosion-resistant steel plates with a yield strength of 700M...

AI Technical Summary

Problems solved by technology

This technology is only suitable for small batch production, and it is difficult to meet the needs of mass production, and the uniformity of the entire coil is not easy to guarantee

[0007] In the patents disclosed above, either the strength and corrosion resistance cannot meet the requirements for use, or they are not suitable for mass production

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