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Cold Rolled Steel
Hot rolled steel coil is used as raw material, and the oxide skin is removed by acid pickling before cold continuous rolling. The finished product is hard rolled coil. The cold work hardening caused by continuous cold deformation makes the strength and hardness of hard rolled coil increase, the toughness and plasticity index decrease, and the stamping performance deteriorates, so it can only be used for simple deformed parts.
| Standard | KR | B/QBQ | JFS | JIS |
| Grade | CSP1 | DC01 | JFE-CC | SPCC |
| CSP1D | DC03 | JFE-CD | SPCD | |
| CSP2 | DC03 | JFE-CD | SPCD | |
| CSP3 | DC04 | JFE-CE | SPCE | |
| CSP3E | DC05 | JFE-CF | ||
| CSP3E | DC06 | JFE-CG | ||
| CSP3X | DC07 | JFE-CGX |
■Stamping steel
| Standard | Q/BQB 408-2003 | JFS A 2001-1998 | GB 5213-2001 |
| Grades | BLC | JSC270C | - |
| BLD | JSC270D | - | |
| BUSD | JSC270E | SC1 | |
| BUFD | JSC270F | SC2 | |
| BSUFD | JSC260G | SC3 |
Material Features
Because it has not been annealed, its hardness is very high (HRB is greater than 90), and its machinability is extremely poor. Only simple directional bending of less than 90 degrees (perpendicular to the coiling direction) can be performed. In simple terms, cold rolling is processed and rolled on the basis of hot rolled coils. Generally speaking, it is a processing process of hot rolling → pickling → cold rolling.
Cold rolling is processed from hot-rolled sheets at room temperature. Although the temperature of the steel sheet will be heated up during the processing, it is still called cold rolling. Cold-rolled coils formed by continuous cold deformation of hot-rolling have poor mechanical properties and high hardness. They must be annealed to restore their mechanical properties. Those without annealing are called hard-rolled coils. Hard-rolled coils are generally used to make products that do not need to be bent or stretched, and are bent on both sides or four sides with a thickness of 1.0 or less.
