The SUM12 chemical composition and mechanical properties

    ● Features and Scope:
SUM12 SP low carbon free cutting steel, is the existing cutting steel in the phosphorus content of up to a machinability compared with 15 steel

Improved significantly. Significant anisotropy of mechanical properties of the steel, longitudinal mechanical properties of cold-drawn, cold-drawn steel 15 steel close, often

Instead of 15 steel manufacturing less demanding mechanical properties of the various parts, such as bolts, nuts, pins, shafts, pipe fittings and spark plug

Jacket.
    ● Chemical Composition:
Carbon C: 0.08 ~ 0.16
Silicon Si: 0.15 ~ 0.35
Manganese Mn: 0.70 ~ 1.00
Sulfur S: 0.10 ~ 0.20
Phosphorus P: 0.08 ~ 0.15
● mechanical properties:
Tensile strength σb (MPa): (hot-rolled) 390 to 540; (cold drawn) steel thickness or diameter of 8 to 20: 530 to 755;> 20

30 to 30 hours: 510 to 735;>: 490 to 685
Elongation δ5 (%): (hot-rolled) ≥ 22; (cold rolled) ≥ 7.0
Reduction of area ψ (%): (hot-rolled) ≥ 36
Hardness: (hot) ≤ 170HB; (cold-drawn) 152 ~ 217HB
● Heat treatment and microstructure specifications:
● Delivery status: hot-rolled or cold-drawn state delivery, delivery status should be specified in the contract.