Gear steel 20CrMo

Name: gear steel 20CrMo

Gear steel 20CrMo Features and Scope:
High hardenability, temper brittleness, very good weldability, cold cracking tendency to form small, can be a good machinability and cold plastic strain. Usually in the quenched state or carburizing used for the manufacture of infiltration in non-corrosive media and working temperatures below 250 ℃, pressure pipe and various fasteners containing nitrogen and hydrogen mixture of media work, more advanced carbon parts, such as gears, shafts, etc.

Gear Steel 20CrMo chemical composition:

C	Si	Mn	S	P	Cr	Ni	Cu	Mo
0.17～0.24	0.17～0.37	0.40～0.70	≤0.035	≤0.035	0.80～1.10	≤0.030	≤0.030	0.15～0.25

Gear steel 20 crmo mechanical properties:
Tensile strength of sigma b (MPa) : 885 (90) or higher
Yield strength sigma s (MPa) : 685 (70) or higher
Elongation delta (%) : 12 or more
Reduction of area bits (%) : 50 or more
Impact energy Akv (J) : p. 78
Impact toughness values of alpha kv (J/cm2) : 98 (10) or higher
Hardness: 197 hb or less
Sample size: blank sample size is 15 mm

Heat treatment specification and metallographic organization:
Heat treatment specification: 880 ℃ quenching, water cooling, oil cooling; 500 ℃ tempering, water cooling, oil cooling.

Delivery status: by heat treatment (normalizing, annealing and high temperature tempering) or heat treatment state delivery, delivery status should be indicated in the contract.