Material Name: cutting structural steel
Grade: Y20
Standard: GB / T 8731-1988
● Features and Scope:
Low parathion composite cutting steel, which is better than the 20th cutting steel but lower than Y12 steel, but higher than the Y12 Y20 mechanical properties of the steel. Carburizing treatment can be carried out after cutting molding, used to make the surface hardness, high toughness instrumentation center shaft parts and wear parts.
● Chemical Composition:
Carbon C: 0.17 ~ 0.25
Si Si: 0.15 ~ 0.35
Mn Mn: 0.70 ~ 1.00
Sulfur S: 0.08 ~ 0.15
Phosphorus P: ≤0.06
● Mechanical Properties:
Tensile strength σb (MPa) :( hot) 450 to 600; (cold drawn) steel thickness or diameter of 8 to 20 o'clock: 570 to 785;> 20 to 30: 530 - 745;> 30: 510 - 705
Elongation δ5 (%) :( hot rolled) ≥20; (rolled) ≥7.0
Reduction of area ψ (%) :( hot rolled) ≥30
Hardness :( hot) ≤175HB; (cold drawing) 167 ~ 217HB
● Heat treatment and microstructure specifications:
● Delivery status: hot-rolled or cold-drawn delivery, the delivery status should be specified in the contract