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4130 Steel

Shapes Available

  • Flat Bar
  • Hex Bar
  • Pipe
  • Plate
  • Round Bar
  • Sheet
  • Square Bar
  • Tubing


  • Aerospace
  • Manufacturing

Industry Names

  • 4130 Cond Annealed/Normalized
  • Chrome Moly 4130
  • CroMoly
  • Alloy 4130
  • 4130 Condition D
  • 4130 Condition F


  • Cold Finished and Alloy


  • AMS 6350 (Sheet-Plate)
  • AMS 6370 (Round Bar)
  • AMS 6371
  • MIL-S-6758
  • MIL-T-6736


  • Aircraft Engine Mounts
  • Welded Tubing Applications


  • Good Formability in the Annealed Condition
  • Good General Machinability
  • Good Weldability

4130 Steel is a low alloy steel that contains chromium and molybdenum as strengthening agents. With a nominal carbon content of 0.30% this alloy is excellent for fusion weldability. 4130 can also be hardened through heat treatment.

4130 can increase its wear quality through nitriding. 8630 and 4130 have similar properties. 4130 is known as a Chrome-Moly alloy. In addition alloy 4130 is stocked in a normalized, quench and tempered conditions.

4140 and 4130 are similar but 4130 has better weldability due to the smaller amount of Carbon but does give up through thickness strength based on that Carbon content as well.

4130 is available in the following forms: Flat bar, sheet, hex bar, pipe round bar, square bar and plate.

Please contact us to request a quote. We specialize in hard to find material.

We work closely with many manufacturers in the aerospace & defense industry. We work with NADCAP approved heat treaters and testing laboratories. We can supply DFARS compliant material.

Chemical Composition
C0.28 0.33
Cr0.80 1.1
Mn0.7 0.9
Mo0.15 0.25
P- 0.035
S- 0.04
Si0.15 0.35

DISCLAIMER: The information provided on this Web site, technical or otherwise, is merely for informational purposes, and is not intended to serve as a guide, manual, instructions, or any kind reference for proper safety procedures or material purchasing. Michlin Metals makes no warranty, express or implied, based on the statements on this Web site and, as such, will not be liable for any damages, either direct or indirect, including but not limited to consequential damages, such as damages for loss of profits, that may arise based on reliance on the information provided on this Web site. Some information has been referenced from reliable industry sources. Tradenames listed are the sole property of the tradename owners. Michlin Metals typically provides branded products through its relationships with mills and authorized re-sellers. Equivalent non-branded product is sometimes also available through certified sources of such products. Michlin Metals will never substitute non-branded product when branded product is requested.

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