27SiMn pipe for boiler

The performance of 27SiMn steel is better than that of 30Mn2 steel, the hardenability is higher, the critical hardening diameter in water is 8~22mm, the machinability is good, the cold deformation plasticity and weld ability are medium; in addition, the toughness of steel is not much reduced during heat treatment. However, 27SiMn has a relatively high strength and wear resistance, especially when water quenching still has high toughness.

27SiMn Chemical Composition

C: 0.24~0.32
Si: 1.10~1.40
Mn: 1.10~1.40
P: ≤0.035
S: ≤0.035
Cu: ≤0.30
Cr: ≤0.30
Ni: ≤0.30
Mo: ≤0.15

Mechanical properties of 27SiMn Steel

Sample blank size (mm): 25
Tensile strength (σb/MPa): ≧980
Yield point (σs/MPa): ≧835
Elongation after break (δ5/%): ≧12
Area shrinkage (ψ/%): ≧40
Impact absorption work (Aku2/J): ≧39
Brinell hardness (HBS100/3000) (annealed or high temperature tempered state): ≦217