Annealing hardness
HBS |
Cold pull hardness
HBS |
Preheating temperature
℃ |
Quenching temperature
℃ |
Holding time
min |
Hardening medium
|
Temper temperature
℃ |
After tempering hardness
≥HRC | |
salt-bath furnace
|
controlled atmosphere furnace
| |||||||
235
|
262
|
788
|
1191
|
1204
|
5~15
|
air cooling
|
522
|
60
|
Steel plate/Sheet
thickness / mm |
σb
MPa |
σs
≥/MPa |
δ
Samples from the standard for 50 mm (2 in) |
180 ° of cold bending test
| |
longitudinal
|
horizontal
| ||||
Hot-rolled/Cold rolling:5 - 150
|
520
|
415
|
16~18
|
2a
|
3.5a
|
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