ISI 4140 Alloy steel material stockholders and suppliers from
China-OTAI SPECIAL STEEL . we have more 16 years experience in 4140
steel plate, round bar, flat bar, square supply.AISI 4140 alloy
steel is chromium, molybdenum, manganese containing low alloy
steel. It has high fatigue strength, abrasion and impact
resistance, toughness, and torsional strength. The following
datasheet gives an overview of AISI 4140 alloy steel.
4140 alloy steel material is a high quality Quenched and Tempered
Alloy Structural steel, It belong to the high quality medium carbon
alloy steel, Oil Quenched & Tempered Hardenss is 28-34 HRC.4140
Annealing delivery hardenss less than 250HB.
1. SAE AISI 4140 steel Form of Supply
ASTM / AISI 4140 Alloy structural steel, we can supply the round
bar, steel flat bar, plate, hexagonal steel bar and square, block.
4140 alloy steel Round bar can be cut to your required lengths as
one offs or multiple cut pieces. Rectangular pieces can be cut from
flat bar or plate to your specific sizes. Ground tool steel bar can
be supply, providing a quality precision finished bar to tight
tolerances.
Round
sheet
Square
Plate
Hexagonal
Pipe
2. AISI 4140 equivalent material
- JAPAN : JIS SCM440 alloy steel
- GERMANY: DIN WN-r 1.7255 / 42CrMo4 steel alloy
- CHINA : GB 42CrMo steel
- BRITISH: BS 708M40
3. AISI 4140 alloy steel Chemical composition
| ASTM A29/29M | C | Si | Mn | Cr | Mo | P | S |
| 4140 | 0.38~0.43 | 0.15~0.35 | 0.75~1.00 | 0.80~1.10 | 0.15~0.25 | ≤0.035 | ≤0.040 |
| DIN WN-r | C | Si | Mn | Cr | Mo | P | S |
| 1.7225 | 0.38~0.45 | ≤0.40 | 0.60~0.90 | 0.90~1.20 | 0.15~0.30 | ≤0.035 | ≤0.035 |
| GB/T | C | Si | Mn | Cr | Mo | P | S |
| 42CrMo | 0.38~0.45 | 0.17~0.37 | 0.50~0.80 | 0.90~1.20 | 0.15~0.25 | ≤0.030 | ≤0.030 |
| BS | C | Si | Mn | Cr | Mo | P | S |
| 708M40 | 0.36~0.44 | 0.10~0.35 | 0.70~1.00 | 0.90~1.20 | 0.15~0.25 | ≤0.035 | ≤0.035 |
| JIS | C | Si | Mn | Cr | Mo | P | S |
| SCM440 | 0.38~0.43 | 0.15~0.35 | 0.60~0.85 | 0.90~1.20 | 0.15~0.30 | ≤0.030 | ≤0.030 |
4. Applications
DIN 4140 Tool steel is a alloy structural steel, 4140 is used for
engineering structural, like high tensile shafts, bolts and nuts,
gears, pinions and spindles. Locomotive traction with the big gear,
supercharger drive gear, pressure vessel, rear axle, gear load of
connecting rod and a spring clip,4140 can also be used to under
2000 m deep well of oil drill pipe joint and the fishing tool, and
can be used for bending machine mould, etc
5. Supply Size range
Hot Rolled 4140 steel bar: Ø5mm-200mm
Forging 4140 steel bar: Ø140mm-3000mm
Hot rolled 4140 steel plate: Thickness 10mm-200mm x width 100-2300mm
Forged 4140 material steel plate: Thickness 150-1500mm x Width 100 x 3000mm
Others 4140 material have not specified size, pls contact our
experienced sales team.
