Performance Characteristics:
High strength, high tenacity, good hardenability, and high resistance to thermal properties.
Applications:
Used for the important quenched and tempered parts which request high strengh , high toughness and large section size, such as the transmission of the horizontal forging machine eccentric shaft, forging crankshaft.It is also used for manufacturing big sized important quenched-and-tempered parts which request good toughness and high strength. such as top load shaft ,steam turbine shaft, vane, and heavy-load transmission parts, fastening piece, crankshaft, gears etc.
Chemical Composition(%):
|
Standard
|
Steel Grade
|
C
|
Si
|
Mn
|
P
|
S
|
Cr
|
Mo
|
Ni
|
|
DIN
|
1.6511
|
0.35-0.43
|
≤0.40
|
0.50-0.80
|
≤0.025
|
≤0.035
|
0.60-1.00
|
0.15-0.25
|
0.70-1.20
|
|
ASTM
|
4340
|
0.38-0.43
|
0.15-0.35
|
0.60-0.80
|
≤0.035
|
≤0.040
|
0.70-0.90
|
0.20-0.30
|
1.65-2.00
|
|
GB
|
40CrNiMoA
|
0.37-0.44
|
0.17-0.37
|
0.50-0.80
|
≤0.025
|
≤0.025
|
0.60-0.90
|
0.15-0.25
|
1.25-1.65
|
Annealed Hardness:
|
HBS≤248
|
Process Of Production
|
EAF+LF+VD+ESR+Forged +Heat Treatment(optional)
|