AISI 4140 Alloy Steel | 1.7225 | SCM440 | 42CrMo4
Alloy Steel Plate 4140 is a flat shaped, plate of oil-hardening,
chromium-molybdenum 4140 steel.
It has good strength and wear resistance, excellent toughness and
ductility. 4140 Alloy steel has the ability to resist stress and
creep at prolonged high temperatures (up to 1000°F).
4140 Alloy Steel is also available in leaded grades which greatly
improves machinability. However leaded grades should not be used in
applications where the temperature is elevated. This can cause
lower ductility in these grades.
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.
MORE DETAILS ABOUT 4140 STEEL PLATE
- Specifications: AMS-S-6395
- Characteristics:Machinability: Moderate; Weldability: Moderate;
Fatigue Resistance: Good
- Uses: Ships, Vehicles, Aircraft, Missiles, Weapons, Railways,
Bridges, Pressure vessels, Machine tools
- More Info
- Density: 0.284 lb/in3
- Poissons Ratio: 0.29
- Melting point: 2580°F
- Hardness Brinell: 197
- Elastic modulus: 27557-30458 ksi
- Tensile strength : 95000 psi
- Yield strength: 60200 psi
- 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
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
|
Mechanical Properties of 4140 alloy steel
| Properties | Metric | Imperial |
| 1.Tensile strength | 655 MPa | 95000 psi |
| 2.Yield strength | 415 MPa | 60200 psi |
| 3.Bulk modulus (typical for steel) | 140 GPa | 20300 ksi |
| 4.Shear modulus (typical for steel) | 80 GPa | 11600 ksi |
| 5.Elastic modulus | 190-210 GPa | 27557-30458 ksi |
| 6.Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
| 7.Elongation at break (in 50 mm) | 25.70% | 25.70% |
| 8.Hardness, Brinell | 197 | 197 |
| 9.Hardness, Knoop (converted from Brinell hardness) | 219 | 219 |
| 10.Hardness, Rockwell B (converted from Brinell hardness) | 92 | |
| 11.Hardness, Rockwell C (converted from Brinell hardness. Value
below normal HRC range, for comparison purposes only) | 13 | 13 |
| 12.Hardness, Vickers (converted from Brinell hardness) | 207 | 207 |
| 13.Machinability (based on AISI 1212 as 100 machinability) | 65 | 65 |
Forming
AISI 4140 alloy steel has high ductility. It can be formed using
conventional techniques in the annealed condition. It requires more
pressure or force for forming because it is tougher than plain
carbon steels.
Welding
AISI 4140 alloy steel can be welded using all conventional
techniques. However, the mechanical properties of this steel will
be affected if it is welded in the heat treated condition, and post
weld heat treatment should be performed.
Forging
AISI 4140 alloy steel is forged at 926 to 1205°C (1700 to 2200°F)
Hot Working
AISI 4140 alloy steel can be hot worked at 816 to 1038°C (1500 to
1900°F)
Cold Working
AISI 4140 alloy steel can be cold worked using conventional methods
in the annealed condition.
Processing
AISI 4140 steel can be cut to the size you need.
