Cold-roll steel sheet with good phosphorization performance and production method

Abstract

The invention provides a cold-roll steel sheet with the good phosphorization performance and a production method. The cold-roll steel sheet contains, by weight, smaller than or equal to 0.10% of C, smaller than or equal to 0.030% of Si, smaller than or equal to 0.50% of Mn, smaller than or equal to 0.035% of P, smaller than or equal to 0.035% of S, smaller than or equal to 0.080% of Al, smaller than or equal to 0.0080% of N, smaller than or equal to 0.10% of Ti and the balance Fe and unavoidable impurities. Compared with the prior art, the cold-roll steel sheet is characterized by being produced through the procedures of hot rolling, acid pickling, five-rack complete-six-roll cold continuous rolling and continuous annealing and levelling by precisely controlling the components in steel. After the produced steel sheet is phosphorized, a phosphorization film is uniform, the film weight is larger than or equal to 2.5 g / m<2>, the copper sulfate drop experiment time in corrosion resistance evaluation is longer than or equal to 60 s, the time that the steel sheet is soaked in a 3 wt% NaCl solution before the steel sheet starts to be rusted is longer than or equal to 75 min, and the requirements of steel downstream users on the high appearance quality and the good corrosion resistance of the phosphorized cold-roll steel sheet are met.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a cold-rolled steel plate with excellent phosphating performance and a production method. Background technique [0002] Phosphating treatment refers to the process of forming an insoluble and dense phosphate film on the metal surface through chemical and electrochemical reactions in an acidic phosphating solution. The purpose of phosphating is mainly to provide protection for the base metal and prevent the metal from being corroded to a certain extent; it is used as a primer before painting to improve the adhesion and anti-corrosion ability of the paint film layer; it can reduce friction in the metal cold processing process Lubrication. As an important pre-painting treatment method, phosphating treatment is widely used in the fields of home appliances and automobile production. The quality of phosphating treatment directly affects the appearance quality and corrosion r...

AI Technical Summary

Problems solved by technology

[0008] The present invention also provides a production method of a cold-rolled steel sheet with excellent phosphating performance. Through reasonable process design and control, a cold-rolled steel sheet with excellent phosphating performance can be obtained, which solves the problem of the existing common cold-rolled sheet. During the phosphating process, problems such as uneven phosphating, light film weight, and poor antirust ability of the phosphating film

Images