Analysis of Factors as Affecting Cold-forming Performance of TP439 Strip Steel
Tow TP439 strip steels with same thickness,different chemical compositions and made with different ma-nufacturing processes are used to produce the products with the same size via the same cold-bending formation process.The key factors as affecting the cold-bending forming performance of the TP439 strip steel,i.e.,the chemical composition and the finish-rolling temperature are identified by means of testing and analyzing the metallographic structure,the residual stress(via the C Type Method),the tensile property and the hardness,etc.Comparatively Elements C and N in the chemical composition produces more obvious influences mainly on the hardness,the strength and the elongation of the strip steel,while the finish-rolling temperature mainly affects the grain size;and the low hardness,the low yield strength,the high elongation and the fine grain size of the strip steel are helpful for cold-bending formation of the strip steel.The result of the above mentioned analyses is worth using as the guide for controlling the performance of the strip steel for cold-bending formation purpose.
cold-bending formationTP439residual stressfinish-rolling temperature
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