4130 (AMS 6345/ AMS 6346 / AMS 6350)
Chrome-Moly Aircraft Steel
Technical Data Sheet
Alloy 4130 (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.
Aircraft Quality 4130 per 6345 & 6350 Cold Rolled Sheet
Chromaloy Steel 4130 (E4130) combines Chromium and Molybdenum to maximize strength in this heat-treatable Aircraft Quality AISI 4130 alloy steel. The term Aircraft Quality (or AQ Steel) which is common to all steel at Benedict-Miller means it is suitable for the production of aircraft parts which are subject to magnetic particle inspection after machining.
Specifications
AMS 6345 Sheet / Plate, Normalised
AMS 6346 Bar Hardened & Tempered
AMS 6350 Sheet / Plate
AMS 6351 Sheet / Plate, spheroidised
AMS 6370 Bar
AMS 6371 Tube
MIL-S-6758
MIL-S-18729
MIL-T-67366
AISI 4130
Applications of 4130 Chrome- Moly Aircraft Steel :
Automotive
Military / Commercial Aircraft
Machine Tools
Components
Motorsports
Aerospace
Oil and Gas industry
Chemical Composition Limits
| Weight% | C | Mn | P | S | Si | Cr | Ni | Mo | Cu |
| 4130 Bar/Tube | 0.28 – 0.33 | 0.40-0.60 | 0.025 max | 0.025 max | 0.15 – 0.35 | 0.80-1.10 | 0.25 max | 0.15-0.25 | 0.35 |
| 4130 Sheet/Plate | 0.28 – 0.33 | 0.40 – 0.60 | 0.025 max | 0.025 max | 0.20-0.35 | 0.80-1.10 | – | 0.15 – 0.25 | – |
Typical Mechanical Properties
| 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 |
