A kind of preparation method of 410 stainless steel strip material for nuclear power

Abstract

The invention discloses a method for preparing a 410 stainless steel strip for nuclear power, which comprises the following steps: step 1, performing nondestructive flaw detection treatment on a 410 stainless steel forged slab; step 2, subjecting the treated slab to first annealing, hot rolling and the second annealing; step 3, surface treatment and pickling of the hot-rolled slab after the second annealing; step 4, cold rolling; step 5, carrying out non-destructive flaw detection treatment on the cold-rolled slab; After the treatment, the cold-rolled slab is cut and rolled; Step 7, annealing the cold-rolled plate, and then finishing; Step 8, performing non-destructive testing on the stainless steel plate; Step 9, removing the flaw detection blind area of ​​the treated stainless steel plate, Then carry out strip rolling; Step 10, anneal the finished strip to obtain 410 stainless steel strip for nuclear power. The method of the invention can effectively eliminate the opening and closing defects generated in the processing process, ensure the smooth progress of the plate in the strip rolling and other processes, and improve the product yield.

Description

technical field [0001] The invention belongs to the field of processing stainless steel strips, in particular to a method for preparing 410 stainless steel strips for nuclear power. Background technique [0002] ASTM410 stainless steel belongs to martensitic hardenable stainless steel, the national standard is 1Cr13, and the American standard AISI is S41000. The content of C element in this alloy is about 0.15%, and the content of Cr element is 13%. The stainless steel can form martensite and strengthen through quenching, and its strength and toughness can be adjusted through different tempering temperatures. Therefore, this type of alloy can change its mechanical properties by adjusting its heat treatment system. [0003] 410 stainless steel has good oxidation resistance, adjustable strength and toughness, and excellent machinability. In addition, this stainless steel has a large thermal conductivity and a very small thermal expansion coefficient. Its comprehensive perform...

AI Technical Summary

Problems solved by technology

[0006] Raw materials use forged slabs or cast slabs, and the material grains cannot be evenly distributed, which may cause differences in the quality of finished products;

[0007] In addition, non-destructive testing methods are not added in the processing process, which can directly cause defects to remain hidden and exposed in the finished product processing stage to reduce the yield, and even exist in the finished strip without being found, resulting in defective products

[0008] Conventional stainless steel pickling mostly uses a concentrated acid ratio. Due to the high concentration of the acid solution, the pickling process is difficult to control. In addition, the violent reaction of the acid solution will release a large amount of NO 2 , N 2 o 4 and HF gas, which can damage the health of operators in severe cases

[0009] The conventional cold rolling method of stainless steel is to directly roll to the required size of the finished product. The defects of this type of cold rolling method are: such as indentation, folding, cracks and other defects that cannot be eliminated in the rolling process if they are not found in time, and the subsequent surface treatment is difficult or even ground. Resulting in size out-of-tolerance or plate damage, leading to defective and scrapped finished plates, increasing the difficulty of follow-up work and reducing the yield of finished products.

[0010] In addition, if a defect is found in the conventional cold rolling process, the cold rolling will continue directly after grinding, and it is impossible to judge whether the defect is completely ground, and the grinding marks will also affect the surface quality of the finished plate