| Customization: | Available |
|---|---|
| Type: | Round |
| Standard: | AISI, ASTM, DIN, JIS, GB, BS |
|
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Introduction:
AISI 4130 alloy steel is a medium carbon, low alloy steel in ASTM A29 standard. ASTM 4140
steel is also commonly referred to as a chromoly steel, or chrome moly steel, containing nominally
0.28-0.33% Carbon, 0.8-1.1% Chromium and 0.15-0.25% Molybdenum. It is similar to 4140 steel
which has a higher carbon level (0.28-0.33%), giving 4130 material improved weldability, at the
expense of through thickness strength. With the proper heat treatment it is also readily machined.
Annealing ASTM 4130 alloy steel offers excellent ductility. AISI 4130 steel is usually supplied as
round bar commonly in the hardened and tempered condition.
AISI/SAE 4130 steel grade is a versatile alloy with good atmospheric corrosion resistance and
reasonable strength up to around 315º C (600º F). It shows good overall combinations of strength,
toughness and fatigue strength.
Chemical Composition
| C | Mn | P | S | Si | Cr | Mo |
| 0.28-0.33 | 0.40-0.60 | 0.035 | 0.040 | 0.15-0.35 | 0.80-1.10 | 0.15-0.25 |
| Properties | Metric |
| Tensile strength, ultimate | 560 MPa |
| Tensile strength, yield | 460 MPa |
| Modulus of elasticity | 190-210 GPa |
| Bulk modulus (Typical for steel) | 140 GPa |
| Shear modulus (Typical for steel) | 80 GPa |
| Poissons ratio | 0.27-0.30 |
| Elongation at break (in 50 mm) | 21.50% |
| Reduction of area | 59.6 |
| Hardness, Brinell | 217 |
| Hardness, Knoop (Converted from Brinell hardness) | 240 |
| Hardness, Rockwell B (Converted from Brinell hardness) | 95 |
| Hardness, Rockwell C (Converted from Brinell hardness, value below normal HRC range, for comparison purposes only.) | 17 |
| Hardness, Vickers (Converted from Brinell hardness) | 228 |
| Machinability (Annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.) | 70 |
| Properties | Metric |
| Thermal conductivity (100°C) | 42.7 W/mK |
Forging of 4130 Alloy Steel
ASTM A29 Grade 4130 steel should be forged between 1230 and 950 º C (2250 and 1750 º F).
The lower the finishing temperature from forging, the finer will be the grain size. If the 4130 alloy
steel is forged at too low a temperature, there is a risk of the formation of a non-uniform structure
in certain areas of the forged part, necessitating a normalizing treatment, prior to further heat treatment.
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