Cold rolling production process
Cold-rolling and commonly used way. Cold rolling production process generally include raw material preparation, pickling, rolling, degreasing, annealing (heat treatment), finishing and so on. Cold to hot-rolled products as raw materials, cold raw material before first removal, to ensure that the surface of the cold rolled products clean. Rolling the material deformation is the main step. The purpose is to be attached to skim grease rolled on the rolling is removed, to prevent pollution of the steel surface during annealing, but also to prevent the stainless steel by carbon. Annealing including intermediate annealing and final heat treatment, the intermediate annealing is through recrystallization work hardening produced eliminate cold deformation, to recover plastic material and reduce the deformation resistance of the metal.
Finished purpose of heat treatment except through recrystallization eliminate hardening outside. In that according to the technical requirements for products to obtain tissue (such as a variety of texture, etc.) and the desired product properties (such as deep drawing, electromagnetic properties, etc.). Finishing includes inspection, shear, straightening (flat), printing, packaging and other content classification. Cold-rolled products have a high packing requirements, to prevent product during transport surface is scratched.
The step when external production of some special products in addition to each have their own special process. As time rolled silicon steel sheet before cold rolling to decarburization annealing, after rolling to conduct film, high-temperature annealing, stretching straightening (see tension straightening) and tempering.
Chemical composition
|
Grade |
C |
Si |
Mn |
P |
S |
Cu |
|
SPCC |
0.02～0.08 |
≤0.10 |
0.15～0.30 |
≤0.045 |
≤0.050 |
≤0.050 |
|
Q195 |
0.06～0.12 |
≤0.30 |
0.25～0.50 |
≤0.045 |
≤0.050 |
≤0.050 |
|
Q235-B |
0.12～0.20 |
≤0.30 |
0.30～0.70 |
≤0.045 |
≤0.050 |
≤0.050 |
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Mechanical Properties
|
Grade |
Yield Strength RcL |
tensile strength Rm |
Elongation A80mm |
Impact test (longitudinal) |
|
|
temperature℃ |
Impact energy AkvJ |
||||
|
SPCC |
≥195 |
315～430 |
≥33 |
|
|
|
Q195 |
≥195 |
315～430 |
≥33 |
|
|
|
Q235-B |
≥235 |
375～500 |
≥25 |
20 |
≥27 |
