AMS 6346 4130 Aircraft Steel Bar
AMS 6346 Steel Bars 0.95Cr - 0.20Mo (0.28 to 0.33C) (SAE 4130) Hardened and Tempered, 125 Ksi (862 MPa) Tensile Strength, This specification covers an aircraft-quality, low-alloy steel in the form of heat treated bars. AISI 4130 is a chromium molybdenum alloy steel being a widely used Aircraft Steel due to its weldability, ease of fabrication and mild hardenability. The hardenability and weldability of Alloy 4130 are considered equivalent to 8630 (MIL-S-6250) . Alloy 4130 is also vacuum degassed to meet the magnetic particle inspection standards of AMS 2301. 
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| Alloy | Condition | Thickness | Tensile Strength ksi | Yield Strength ksi | Elongation | Hardness |
| Tube AMS 6371 | Cold Drawn | - | 95 | 70 | 12 | <25 |
| Bar AMS 6370 | Annealed | - | - | - | - | 29HB Max |
| Bar AMS 6346 | Hardened & Tempered | - | 125 | 100 | 17 | - |
| Sheet AMS 6350 | Annealed | - | - | - | - | <25 HRC |
| Sheet AMS 6345 | Normalised | <0.062" | 95 | 75 | 8 | - |
| Sheet AMS 6345 | Normalised | 0.062"- 0.125" | 95 | 75 | 10 | - |
| Sheet AMS 6345 | Normalised | 0.125"- 0.187" | 95 | 75 | 12 | - |
| Sheet AMS 6345 | Normalised | 0.187"- 0.250" | 90 | 70 | 15 | - |
| Sheet AMS 6345 | Normalised | 0.250"- 0.750" | 90 | 70 | 16 | - |
| Sheet AMS 6345 | Normalised | 0.750"- 1.500" | 90 | 70 | 18 | - |
| Sheet AMS 6345 | Normalised & Heat Treated | 0.249"- 0.375" | - | - | - | 42 |
| Sheet AMS 6345 | Normalised & Heat Treated | 0.375"- 0.500" | - | - | - | 38 |
| Sheet AMS 6345 | Normalised & Heat Treated | 0.500"- 0.625" | - | - | - | 32 |
| Sheet AMS 6345 | Normalised & Heat Treated | 0.625"- 0.750" | - | - | - | 29 |
| Sheet AMS 6345 | Normalised & Heat Treated | 0.750"- 0.875" | - | - | - | 27 |
| Sheet AMS 6345 | Normalised & Heat Treated | 0.875"- 1.500" | - | - | - | 26 |
Physical Properties
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
| Modulus of Elasticity | 205 GPa | 29.7 × 10⁶ psi |
| Thermal Conductivity | 42.7 W/m·K | 296 BTU·in/hr·ft²·°F |
| Electrical Resistivity | 0.22 µΩ·m | — |
| Magnetic Properties | Magnetic | — |
Applications of 4130 Chrome- Moly Aircraft Steel :
- Aerospace & Military: Aircraft structural parts, brackets, transmission components and auxiliary landing gear parts
- Automotive & Motorsports: Chassis, drive shafts, suspension systems and high-strength fasteners
- Industrial Manufacturing: Machine tool accessories, precision mechanical components
- Oil & Gas: High-pressure and wear-resistant downhole and drilling equipment parts
Product SpecificationsZYTC Alloy provides full-range 4130 alloy products covering diverse forms and industry standards: Product Forms: Round bars, square bars, hex bars, flat bars, sheets, plates, tubes, welding wires and powders SpecificationsAMS 6345 Sheet / Plate, Normalised AMS 6346 Bar Hardened & Tempered AMS 6350 Sheet / Plate AMS 6351 Sheet / Plate, spheroidised AMS 6370 Bar AMS 6348 Bar AMS 6371 Tube AISI 4130 ASTM A322 ASTM A331 |  |
Why Choose ZYTC Alloy for AMS 6346 4130 Aircraft Steel?
ZYTC Alloy is a leading AS9120B and ISO 9001 certified alloy steel supplier and manufacturer based in China, with decades of industry experience serving global aerospace, defense, automotive, and industrial clients.
Our Advantages:
✅ AS9120B & ISO 9001 certified – rigorous quality management
✅ AMS 6346, AMS 6348, AMS 6370, and AMS-S-6758 compliant materials
✅ Full material traceability from melt to delivery
✅ EN 10204 3.1 / 3.2 inspection certificates available
✅ Aircraft quality vacuum degassed material meeting AMS 2301 standards
✅ Multiple product forms: round bar, flat bar, hexagon bar, square bar
✅ Hardened and tempered condition per AMS 6346 (125 ksi / 862 MPa)
✅ Custom cutting, forging, and processing services available
✅ Competitive factory pricing with no intermediaries
✅ Fast global delivery from ex-stock inventory
✅ Technical support from experienced metallurgists
Contact ZYTC Alloy Today
📧 Email: daisy@zytcsteel.com
📲 WhatsApp: +86 17335753350
