Cold rolling production method of medium-chromium ferrite stainless steel for vehicle exhaust system
A technology of automobile exhaust system and production method, applied in metal rolling, metal rolling, rolling mill control device and other directions, can solve the problems of increasing manufacturing cost, wrinkling and cracking, poor formability, etc., to reduce production cost, The effect of large shear strain energy, improving production efficiency and yield
Inactive Publication Date: 2016-11-23
BAOSTEEL DESHENG STAINLESS STEEL
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Problems solved by technology
Exhaust system components are prone to various wrinkles and cracks due to poor formability during the stamping production process, resulting in scrapped parts, which not only increases manufacturing costs, but also causes waste of materials
Method used
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Embodiment 1
[0043] The longitudinal grain structure of the cold-rolled annealed sheet of embodiment 1 is as follows figure 1 As shown, the corresponding grain size is grade 7. The grain structure of comparative example 1 is as figure 2 As shown, the grain size is 6.5.
[0044] Depend on figure 1 , figure 2 It can be seen that the steel grains produced by five continuous rolling of the present invention are smaller and more uniform than the steel grains produced by twenty-rollers of Comparative Example 1. big. Therefore, the present invention has a high recrystallization nucleation rate, finer grains after annealing, and uniform grain size in the thickness direction.
[0045] Example 1 and comparative example 1 steel plate longitudinal section shear strain after cold rolling is respectively as follows image 3 , Figure 4 shown. Depend on image 3 , 4 It can be seen that on the longitudinal section of the slab corresponding to Example 1, a shear strain ring with a large amplitu...
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Abstract
The invention discloses a cold rolling production method of medium-chromium ferrite stainless steel for a vehicle exhaust system. Cold rolling steps adopt five passes of continuous cold rolling by a five-stand tandem rolling unit; the reduction rate in the first pass is 19-21%; the reduction rate in the second pass is 34-36%; the reduction rate ratio in the third, fourth and fifth passes is 6-7: 4-5: 3; the total reduction rate is not lower than 70%; and the plate thickness after cold rolling is within 0.8-1.5 mm. The steel has the r value of 1.5-1.8, the yield strength of not less than 240 MPa, the tensile strength of not less than 415 MPa, the ductility of not less than 36% and the roughness of not more than 0.7 microns; the molding strain ratio of the steel is increased; the forming performance is enhanced; the roughness satisfies the use conditions of the vehicle exhaust system; and a new technology is provided for industrial production of the medium-chromium ferrite stainless steel for the vehicle exhaust system.
Description
technical field [0001] The invention belongs to the field of preparation of medium-chromium ferritic stainless steel cold-rolled plates, and in particular relates to a cold-rolled production method of medium-chromium ferritic stainless steel used in an automobile exhaust system. Background technique [0002] In recent years, with the rapid development of my country's automobile industry, the requirements for the classification of automobile emissions and the weight reduction of automobiles for energy saving have been further increased. Stainless steel materials, especially high-performance medium-chromium ferritic stainless steel materials, have been widely used, and their usage is increasing year by year, mainly for exhaust systems. [0003] The medium-chromium ferritic stainless steel used in automobile exhaust system is usually cold-rolled plate. The reciprocating cold-rolled plate developed in the 1950s is the main production method of stainless steel cold-rolled plate a...
Claims
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Login to View More IPC IPC(8): B21B1/28B21B37/00
Inventor 张志霞毕洪运李鑫刘春粟沈继程
Owner BAOSTEEL DESHENG STAINLESS STEEL