20mntib Alloy structural steel pipe

20mntib alloy structural steel with good mechanical properties and process performance. The critical hardenability diameter in oil is 14~27mm. 20mntib steel pipe cutting performance is good after normalizing. The fatigue strength and deformation after heat treatment and the notch sensitivity under the bending load after carburizing are both no less than 20CrMnTi.

Chemical Composition of 20mntib Alloy Steel

C: 0.17~0.24
Si: 0.17~0.37
Mn: 1.30~1.60
S: Allowable residual content≤0.035
P: Allowable residual content≤0.035
Cr: Allowable residual content≤0.030
Ni: Allowable residual content≤0.030
Cu: Allowable residual content≤0.030
Ti: 0.04~0.10
B: 0.0005~0.0035

20mntib Alloy structural steel Mechanical Property

Sample blank size (mm): 15
Heat treatment:
First quenching heating temperature (°C): 860; coolant: oil
Second quenching heating temperature (°C):-
Tempering heating temperature (°C): 200; coolant: water, empty
Tensile strength σb (MPa): ≥1130 (115)
Yield strength σs (MPa): ≥ 930 (95)
Elongation δ5 (%): ≥10
Area shrinkage ψ (%): ≥ 45
Impact work Akv (J): ≥ 55
Impact toughness value αkv (J/cm;sup2;): ≥69(7)
Brinell hardness (HBS100/3000) (annealed or high temperature tempered state): ≤ 187

Delivery status of 20mntib Alloy structural steel pipe

Delivery by heat treatment (normalizing, annealing or high temperature tempering) or no heat treatment, the delivery status should be stated in the contract.