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40Cr Alloy Structural Steel
| Brand Name : | XJS |
|---|
Product description
Description:
40Cr is under the standard of GB/T 3077-1999 inChina,
40Cr steel is one of the most widely used steel in machinery manufacturing
field. After quenching and tempering, 40Cr has good comprehensive mechanical
properties, good low temperature impact toughness and low notch sensitivity. its
hardenability is good , when water quench hardening can reach to Ф 28 ~ 60 mm,
when oil quenching hardening can reach to Ф 15 ~ 40 mm. In addition, except quenching
and tempering, it also fits for cyanide and high frequency quenching process. Has
good machinability, when hardness is HB174 ~ 229, the relative cutting
machining is 60%. The steel is suitable for manufacturing to medium-sized
plastic mold.
Equivalent grades:
JIS SCr440
DIN 1.7045
DIN 41Cr4/42G4
BS 41Cr4
SS 2245
ASTM 5140
ISO 41Cr4
Chemical composition
|
|
C% |
Si% |
Mn% |
P% |
S% |
Cr% |
Cu% |
Ni% |
|
40Cr |
0.37-0.44 |
0.17-0.37 |
0.50-0.80 |
0.035 |
0.035 |
0.80-1.10 |
0.03 |
0.03 |
Mechanical properties
|
|
Tensile Strength min |
Yield Strength min |
Elongation min. |
contraction min |
impact min |
Hardness Max |
|
σb/M Pa |
σs/M Pa |
δ5/% |
ψ/% |
Aku2/J |
HBS |
|
|
40Cr |
980 |
785 |
9 |
45 |
47 |
207 |
Heat treatment:
AC3= 780 C
Normalizing: 850 C, oil cooling, hardness 179~229HBS
Softening treatment: 740~760 C, holding 4~6 hours, slow cool at 5~10℃/h, cool to under 600 C,
Air cooling.
Application:
Widely used as Gear, sleeve, shaft, spindle, spindle, pin, connecting rod, crankshaft, screws.
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