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Model No: 4340 Alloy Steel
AMS 6359 / UNS G43406 / 4340 Alloy Steel
AMS 6359 is a sub-type specification of Steel 4340, nickel-chromium-molybdenum steel with medium carbon content. The alloy is deep-hardening, meaning it possesses excellent tensile strength in the hardened and tempered form.
Delivery :
FOB
minimum order :
50 kilograms
Supply Ability :
5000Tonkilograms / Month
Stock Time :
7-10Day
Country of Origin :
CHINA
Quantity :
AMS 6359 is a sub-type specification of Steel 4340 (UNS G43406) , nickel-chromium-molybdenum steel with medium carbon content. The alloy is deep-hardening, meaning it possesses excellent tensile strength in the hardened and tempered form. Furthermore, AMS 6359 parts can have excellent surface hardness after flame hardening or nitriding.
Similar rules apply for welding. AMS 6359 can be readily welded using most methods, but only in the annealed condition. When welded in the hardened condition, there is a danger of quench cracking.
Nonetheless, if necessary, a good weld can be achieved by preheating the area from 400-580 °F to (≈200-300 °C), followed by after-welding stress relief at 1020-1200 °F (≈550-650 °F).
AMS 6359 / 4340 alloy steel possesses multiple positive properties, including excellent toughness, good abrasion resistance, very good shock, and impact resistance, and good atmospheric corrosion resistance. As a result, it’s mostly used in the heavy machinery industry for manufacturing transmission components, including shafts, gears, and axles.
Chemical Composition
| Element | Content (%) |
|---|---|
| Iron, Fe | 95.195 - 96.33 |
| Nickel, Ni | 1.65 - 2.00 |
| Chromium, Cr | 0.700 - 0.900 |
| Manganese, Mn | 0.600 - 0.800 |
| Carbon, C | 0.370 - 0.430 |
| Molybdenum, Mo | 0.200 - 0.300 |
| Silicon, Si | 0.150 - 0.300 |
| Sulfur, S | 0.0400 |
| Phosphorous, P | 0.0350 |
Physical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm3 | 0.284 lb/in³ |
| Melting point | 1427°C | 2600°F |
Mechanical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 745 MPa | 108000 psi |
| Yield strength | 470 MPa | 68200 psi |
| Bulk modulus (typical for steel) | 140 GPa | 20300 ksi |
| Shear modulus (typical for steel) | 80 GPa | 11600 ksi |
| Elastic modulus | 190-210 GPa | 27557-30458 ksi |
| Poisson's ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at break | 22% | 22% |
| Reduction of area | 50% | 50% |
| 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 below normal HRC range, for comparison purposes only) | 17 | 17 |
| Hardness, Vickers (converted from Brinell hardness) | 228 | 228 |
| Machinability (annealed and cold drawn. Based on 100 machinability for AISI 1212 steel.) | 50 | 50 |
Thermal Properties
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient (20°C/68°F, specimen oil hardened, 600°C (1110°F) temper | 12.3 µm/m°C | 6.83 µin/in°F |
| Thermal conductivity (typical steel) | 44.5 W/mK | 309 BTU in/hr.ft².°F |
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