Hengqiao (Shanghai) International Trading Co., Ltd.
Cold-rolled steel sheet material requests for parts forming large plastic deformation degree and the surface can not have wrinkle, crack and other parts. For different parts, use different grades of steel plate. Such as Japanese car by the standards of the steel plate is divided into three categories, the first kind is cold rolled steel sheet (SPCC), usually rimming steel rolling, the second category (SPCD) for rolling steel plate, the third class (SPCE or SPCEN) is the with cold rolled deep drawing steel.
| brand | Chemical composition% | |||||
| C | Mn | P | S | ALta | ||
| DC01 | ≤0.10 | ≤0.50 | 0.035 | ≤0.025 | ≥0.020 | |
| DC03 | ≤0.10 | ≤0.45 | ≤0.030 | ≤0.025 | ≥0.015 | |
| DC04 | ≤0.08 | ≤0.40 | ≤0.025 | ≤0.020 | ≥0.020 | |
| DC05 | ≤0.008 | ≤0.30 | ≤0.020 | ≤0.02 | ≥0.015 | |
| DC06 | ≤0.06 | ≤0.3 | ≤0.020 | ≤0.020 | ≥0.015 | |
| DC07 | ≤0.01 | ≤0.2 | ≤0.02 | |||
| brand | YS | TS | Break elongation | |||
| DC01 | 280 | 270-410 | 28 | |||
| DC03 | 240 | 270-370 | 34 | |||
| DC04 | 270 | 130-210 | 34 | |||
| DC05 | 110 | 260 | 38 | |||
| DC06 | 100 | 250 | 39 | |||
| DC07 | 150 | 250-310 | 44 | |||
Nature of the metal
According to the steelmaking process (melting, casting solidification) and plate of the deoxidization methods used are different, low carbon steel can be roughly divided into the steel and aluminium killed steel, concrete as shown in figure composition of the steel and aluminium killed steel science. Rimmed steel with carbon deoxidization, and killed steel deoxidized in aluminum. The difference of two kinds of steel carbon, oxygen, and the content of aluminum. Rimmed steel oxygen and carbon content, and most of them are non-metallic inclusions exist. Moreover, rimmed steel nitrogen is not fixed, and the nitrogen in the aluminium killed steel is fixed the aluminum. So both, compared to the steel aging degradation phenomenon (forming low tensile strain and the total elongation) is difficult to avoid, and aluminium killed steel is easy to form crystal collection organizations and have hope in the deep drawing of plastic anisotropy. So processing performance requirements of high steel plate (SPCD and SPCE, etc.) should be used in aluminium killed steel, but the boiling steel production of low cost and easy to maintain surface is beautiful, so much.
In addition to the above identification from the composition of the performance of the two kinds of steel plate, can also through the comparison of grain formation were identified from the metallographic. In addition, the size of the grain can use steel plate to control the annealing conditions, boiling steel plate is easy to dramatically change. Especially in order to improve the formability of the steel and processability of enamel products (e.g., not easy to blister), decarburizing annealing about it and made coarser grains and texture is soft cold rolled steel sheet. But if the grain coarsening too may reduce spinning forming limit.
In the face of all these hot rolled steel plate and cold rolled steel sheet in metal qualitative differences of induction. Hot rolled steel plate of the morphology of nonmetallic inclusions in the zonal elongated, with a combination of other metals is not good, and the grain size and shape and can compare the observed anisotropy, make the steel plate has a greater potential anisotropy, which is perpendicular to the rolling direction of low ductility. Cold rolled steel sheet can ease its internal anisotropic by annealing.