Cold rolled steel for LED surface mount device supports and production method

• Main Authors: WU YUANDONG, XIAO SHUCHAO, SHI QIANG, DU XIANGSHENG, HU SHAOWEN, PENG DAFAN, HUANG FEI, KUANG WEI, WANG YONG, MAO YUERONG, XIONG LI, ZHU CHENGYOU, XIONG MINGSONG, WANG DAN, ZHANG ZHAOLI, LIU YONG, HE ZHENHUA
• Format: Patent
• Language: English
• Published: 25.02.2015
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; SEMICONDUCTOR DEVICES

A cold rolled steel for LED surface mount device supports comprises, by weight, 0.01% to 0.06% of C, 0.002% to 0.030% of Si, 0.120% to 0.300% of Mn, at most 0.020% of S, at most 0.020% of P, and 0.02% to 0.07% of Alt. The method includes the production steps that cold rolling is carried out after hot rolling; coiling is carried out; bright annealing is carried out in mixed gases in a bell-type furnace after conventional degreasing is carried out; flattening is carried out; splitting is carried out. The edge camber of the surface of a steel strip is smaller than or equal to 1.5 mm/m, the roughness Ra of the steel strip is smaller than or equal to 0.15 microns, the hardness HV of the steel strip ranges from 120 to 140, the thickness tolerance of the steel strip is controlled to be +/-0.01 to 0.015 mm, the width tolerance of the steel strip is +/-0.05 mm, product performance is stable, the plate shape is good, and the technology is simple.