24 July 2021 Mould Steel Bar
SM50 Mould Steel Bar
SM50 steel is an excellent carbon mold steel. Its chemical composition is similar to medium-carbon high-quality structural steel - 50# steel, but SM50 steel has higher purity, smaller fluctuation range of carbon content, and more stable mechanical properties. The steel has certain hardness, strength and wear resistance after normalizing or quenching and tempering, and it is cheap and good in cutting performance. It is suitable for manufacturing small plastic molds with simple shapes or low precision and long service life. Plastic molds, etc. But SM50 steel has poor welding performance and cold deformation performance.
Chemical Composition (YB / T 094-199) w /%:
| C | Si | Mn | S | P |
|---|---|---|---|---|
| 0.47～0.53 | 0.17～0.37 | 0.50～0.80 | ≤0.030 | ≤0.030 |
Mechanical Properties:
| Proof strength Rp0.2(MPa) | Tensile strength Rm(MPa) | Impact energy KV(J) | Elongation at fracture A(%) | Reduction in cross section on fracture Z(%) | As-Heat-Treated Condition | Brinell hardness(HBW) |
|---|---|---|---|---|---|---|
| 659(≥) | 788(≥) | 14 | 22 | 44 | Solution and Aging,Annealing,Ausaging,Q+T,etc | 114 |
Physical Properties:
| Property | Density kg/dm3 | Temperature T °C/F | Specific heat J/kgK | Thermal conductivity W/mK | Electric resistance µΩ·cm | Modulus of elasticity kN/mm2 | Expansion rate |
|---|---|---|---|---|---|---|---|
| 444(≥) | 582(≥) | 42 | 13 | 22 | Solution and Aging,Annealing,Ausaging,Q+T,etc | 424 | |
| Temp. °C/°F | Creep strain limit (10000h) (Rp1,0)N/mm2 | Creep rupture strength (10000h) (Rp1,0)N/mm2 | |||||
| 436 | 236 | 214 |