420N1 stainless steel continuous annealing acid pickling welding method

Abstract

The invention discloses a 420N1 stainless steel continuous annealing acid pickling welding method. The method is characterized by comprising the following steps that 1, front and rear steel coils arewelded, particularly, during 420N1 stainless steel continuous annealing acid pickling, an MIG welding machine is adopted firstly to weld the front and rear steel coils, and a first weld joint is obtained; 2, a lap joint block is welded, particularly, the lap joint block is welded to the first weld joint of the front and rear steel coils, and the strength of a welded portion is improved; 3, coolingis carried out, and particularly the welded portion is slowly cooled in a hose spraying way. The method has the beneficial effects that since the welding method is improved, the strength of the welded portion is effectively improved, the problems that strip breakage occurs during annealing acid pickling machining, and therefore material faults, surface scratching and the like are caused are avoided, and therefore the 420N1 surface quality and yield are improved.

Description

technical field [0001] The invention belongs to the technical field of stainless steel welding, in particular to a 420N1 stainless steel continuous annealing and pickling welding method. Background technique [0002] With the maturity of the domestic stainless steel market, the demand for 420N1 stainless steel as a substitute for 420J1 is gradually increasing under the trend of steel grade function subdivision. 420N1 stainless steel belongs to martensitic stainless steel and contains nitrogen element. Compared with 420J1, it has significantly improved processability, enhanced corrosion resistance, strength and wear resistance of steel grades and is magnetic. Used to make knives and scissors, medical equipment, turbine blades, etc. When carrying out continuous annealing and pickling production of stainless steel, in order to ensure the continuity of production, it is necessary to weld steel coils with a welding machine, and the MIG welding method is used in the prior art. T...

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Problems solved by technology

[0003] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a continuous annealing and pickling welding method for 420N1 stainless steel, which is simple to operate, effectively increases the strength of the welded part, and avoids broken strips during the annealing and pickling process, resulting in poor material quality and poor surface quality. Scratches and other problems, thereby improving the surface quality and success rate of 420N1

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