Chemical composition and mechanical properties of 27SiMn alloy structural steel

27SiMn belongs to alloy structural steel. The performance of 27SiMn alloy structural steel is better than that of 30Mn2 steel, the hardenability is high, the critical hardenable diameter in water is 8-22mm, the machinability is good, the cold deformation plasticity and weldability are moderate; in addition, the toughness of the 27SiMn steel is not much reduced during heat treatment. However, it has quite high strength and wear resistance, especially when it is water quenched, it still has high toughness; but 27SiMn steel has high sensitivity to white point, and has a tendency to temper brittleness and overheating sensitivity during heat treatment.

27SiMn alloy structural steel mechanical properties:
Sample blank size (mm): 25
Tensile strength (σb/MPa): ≧980
Yield point (σs/MPa): ≧835
Elongation after break (δ5/%): ≧12
Area shrinkage (ψ/%): ≧40
Shock absorption energy (Aku2/J): ≧39
Brinell hardness (HBS100/3000) (annealed or tempered at high temperature): ≦217

27SiMn steel application:
27SiMn steel is mainly used in the quenched and tempered state for the manufacture of hot stamping parts requiring high toughness and wear resistance; it can also be used in normalized or hot rolled supply conditions, such as tractor track pins.

27SiMn alloy steel 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

27SiMn alloy structural steel heat treatment:
The first quenching heating temperature (℃): 920; coolant: water
The second quenching heating temperature (℃):-
Tempering heating temperature (℃): 450; coolant: water, oil