The implementation of the standards: EN 10028/2-2003
characteristics and the scope of application of:
With moderate-intensity, cold plastic deformation at high and
low temperature performance, with the corresponding carbon content
of carbon compared to the higher hardenability. Generally used as a
small cross-section of the parts, and considerable 20Cr steel and
can be used for carburizing pinion, small axes, steel kits, Piston
Pin, Engine sleeves, automotive steering wheel shaft, valve
push-rod, etc.; also can be used for quenching and tempering steel
used, such as cold heading of bolts or larger section of quenched
and tempered parts. .
Chemical Composition:
Carbon C: 0.10 ~ 0.22
Si Si: 0.17 ~ 0.37
Manganese Mn: 1.10 ~ 1.70
S S: to allow the residual content of0.35
P P: to allow the residual content of0.35
Chromium Cr: to allow the residual content of0.30
Ni-Ni: to allow the residual content of0.30
Cu Cu: to allow the residual content of0.30
Mechanical Properties:
Tensile strength b (MPa)785 (80)
Yield strength s (MPa)590 (60)
Elongation 5 (%)10
Shrinkage section (%)40
Impact energy Akv (J)47
Impact toughness values kv (J/cm2)59 (6)
Hardness187HB
Sample size: the sample size of 15mm rough
Heat Treatment and Microstructure norms:
Standardize treatment: 1) quenching 850 ℃, water-cooled,
oil-cooling; tempering, 200 ℃, water-cooled, air-cooled. 2)
quenched 880 ℃, water-cooled, oil-cooling and tempering, 200 ℃,
water-cooled, air-cooled.
delivery status: in order to heat treatment (normalizing,
annealing, or high-temperature tempering) heat treatment or the
status of delivery, delivery, the state should be specified in the
contract.
