.jpg "AISI 4130 alloy steel (UNS G41300)")
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Image credits: GeoArt / shutterstock.com
Alloy steels are designated by four-digit AISI numbers. They are more reactive to mechanical and thermal treatments than carbon steels. They include different types of steels with compositions which exceed the limits of B, C, Mn, Mo, Ni, Si, Cr and Va in carbon steels.
AISI 4130 alloy steel contains chromium and molybdenum as reinforcing agents. It has a low carbon content and can be easily welded. The datasheet below provides more details.
Chemical composition
The chemical composition of AISI 4130 alloy steel is shown in the following table.
| Element | Content (%) |
|---|---|
| Iron, Fe | 97.03 – 98.22 |
| Chrome, Cr | 0.80 – 1.10 |
| Manganese, manganese | 0.40 – 0.60 |
| Carbon, C | 0.280 – 0.330 |
| silicon, silicon | 0.15 – 0.30 |
| Molybdenum, Mo | 0.15 – 0.25 |
| Sulfur, S | 0.040 |
| Phosphorus, P | 0.035 |
Physical properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.85 g / cm3 | 0.284 lb / in³ |
| Fusion point | 1432 ° C | 2610 ° F |
Mechanical properties
| Properties | Metric | Imperial |
|---|---|---|
| Ultimate tensile strength | 560 MPa | 81,200 psi |
| Tensile strength, efficiency | 460 MPa | 66,700 psi |
| Elasticity module | 190-210 GPa | 27557-30458 ksi |
| Bulk modulus (typical for steel) | 140 GPa | 20300 ksi |
| Shear modulus (typical for steel) | 80 GPa | 11600 ksi |
| Poisson coefficient | 0.27-0.30 | 0.27-0.30 |
| Elongation at break (in 50 mm) | 21.50% | 21.50% |
| Reduction of the area | 59.6 | 59.60% |
| Hardness, Brinell | 217 | 217 |
| Hardness, Knoop (converted from Brinell hardness) | 240 | 240 |
| Hardness, Rockwell B (converted from Brinell hardness) | 95 | 95 |
| Hardness, Rockwell C (Converted from Brinell hardness, value less than normal HRC range, for comparison purposes only.) | 17 | 17 |
| Vickers hardness (converted from Brinell hardness) | 228 | 228 |
| Machinability (cold annealed and drawn. Based on 100% machinability for AISI 1212 steel.) | 70 | 70 |
Thermal properties
| Properties | Metric | Imperial |
|---|---|---|
| Thermal conductivity (100 ° C) | 42.7 W / mK | 296 BTU in / hr ft2. ° F |
Other designations
Other designations equivalent to AISI 4130 alloy steel are as follows:
| AMS 6348 | AMS 6371 | ASTM A331 | ASTM A829 | DIN 1.7218 |
| AMS 6350 | AMS 6373 | ASTM A506 | MIL S-18729 | UNI 25 CrMo 4 |
| AMS 6351 | AMS 6374 | ASTM A507 | MIL S-6758 | JIS SCCrM 1 |
| AMS 6360 | AMS 6528 | ASTM A513 | SAE J1397 | JIS SCM 2 |
| AMS 6361 | AMS 7496 | ASTM A519 | SAE J404 | SS 2225 |
| AMS 6362 | ASTM A29 | ASTM A646 | SAE J412 | BS CDS 110 |
| AMS 6370 | ASTM A322 | ASTM A752 | AFNOR 25 CD 4 (S) | SAE J770 |
Manufacturing and heat treatment
Machinability – AISI 4130 steel can be easily machined using conventional methods. However, machining becomes difficult when the hardness of the steel is increased.
Forming of AISI 4130 steel can be carried out in the annealed condition.
- Welding of AISI 4130 steel can be carried out by any commercial method.
- Heat treatment – AISI 4130 steel is heated to 871 ° C (1600 ° F) then quenched in oil. This steel is typically heat treated at temperatures ranging from 899 to 927 ° C (1650 to 1700 ° F).
- Forging of AISI 4130 steel can be performed at 954 to 1204 ° C (1750 to 2200 ° F).
- Hot working of AISI 4130 steel can be performed between 816 and 1093 ° C (1500 to 2000 ° F).
- AISI 4130 steel can be cold worked using conventional methods.
- AISI 4130 steel can be annealed at 843 ° C (1550 ° F) followed by air cooling to 482 ° C (900 ° F).
- Tempering of AISI 4130 steel can be done at 399 to 566 ° C (750 to 1050 ° F), depending on the desired strength level.
- The hardening of AISI 4130 steel can be carried out by work hardening or heat treatment.
Some of the main applications of AISI 4130 alloy steel are aircraft engine mounts and welded tubes.
This article was updated on the 31stst july 2019
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