GB708 .

Cold rolling: the hot rolled steel coil is used as raw material, and then the oxide scale is removed by pickling, and the finished product is hard rolled steel coil. Because of the cold work hardening caused by continuous cold deformation, the strength and hardness of hard rolled coil increase, and the toughness and plasticity index decrease, so the stamping performance will deteriorate and it can only be used for simple deformed parts.

Extended data:

SPHC-The first S stands for steel, P stands for plate, H stands for heat, and C stands for commerce, usually referring to hot-rolled steel plates and strips.

SPHD-stands for hot rolled steel plate and strip for stamping.

Steel stands for hot rolled steel plate and strip for deep drawing.

SPCC-stands for commonly used cold-rolled carbon steel plate and steel strip, and is equivalent to China Q 195~Q2 15A brand and German ST 12 brand. The third letter c of Qizong is the abbreviation of cold cold. When it is necessary to ensure the mechanical properties, add T such as SPCCT at the end of the brand.

SPCD—— stands for cold-rolled carbon steel plate and steel strip for stamping, which is equivalent to China 08AL( 13237) high-quality carbon structural steel and German brand ST 13.

SPCE—— refers to the cold-rolled carbon steel plate and steel strip used for deep drawing, which is equivalent to China 08AL(52 13) deep drawing steel and German brand ST 14. Aging treatment, add n at the end of the brand, such as SPCEN.

Baidu encyclopedia-electromagnetic pure iron cold rolled plate (GB/T6985