Chemical and mechanical properties of 15MnVB alloy structural steel

15MnVB alloy structural steel, as a low carbon martensitic quenching steel, after quenching and low temperature tempering, it not only has the characteristics of high strength combined with good plasticity and toughness, but also has low cold brittle transformation temperature.

Chemical composition of 15MnVB alloy structural steel:
C: 0.12-0.18, Si: 0.17-0.37, Mn: 1.20-1.60, B: 0.0005-0.0035, V: 0.07-0.12, P:≤0.035, S:≤0.035, Cu: 0.30, Cr: 0.30, Ni: 0.30, Mo: 0.15

Mechanical properties of 15MnVB alloy steel:
Sample blank size (mm): 15
Tensile strength (σb/MPa): ≥885
Yield point (σs/MPa): ≥635
Elongation after break (δ5/%): ≥10
Area shrinkage (ψ/%): ≥45
Shock absorption energy (Aku2/J): ≥55
Brinell hardness (HBS100/3000) (annealed or tempered at high temperature): ≤207

15MnVB steel heat treatment:
The first quenching heating temperature (℃): 860; coolant: oil
The second quenching heating temperature (℃):-
Tempering heating temperature (℃): 200; coolant: water, air

Main characteristics of 15MnVB alloy structural steel:
15MnVB steel has excellent cold formability and weldability inherent in ordinary low-carbon steels. The decarburization tendency and quenching deformation during heat treatment are small, and the diameter of complete hardening in oil is 12-18mm (>95℃ martensite) ; Under static load, fatigue and multiple impact loads, its notch sensitivity and overload sensitivity are low.

Application analysis of 15MnVB alloy structural steel:
15MnVB steel can be used to replace 40Cr steel to manufacture important bolts that require high strength, such as connecting rod bolts, cylinder head bolts, and half shaft bolts on automobiles.