ProFormance Metals – 4130 Chromoly Steel
4130 steel is a high tensile grade of steel that contains chromium and molybdenum, and as a result this grade is often referred to as chromoly steel, chrome-moly, CrMo, CRMO, CR-MOLY.
4130 contains an excellent strength to weight ratio and is considerably stronger and harder than standard carbon steels.
The material is not as easily weldable compared to other materials such as BS4 T45 to BS5 T100 or 15CDV6 (1.7734) as it requires pre and post weld heat treatment to avoid cold cracking. It is also unadvisable to weld Chromoly to other carbon steel grades due to the differences in chemical construction. It can be achieved but particular attention to vital stress areas and heat affected zones most be made.
Examples of applications for 4130 steel include aerospace and defence structures, bicycle frames, tubes for transportation of pressurised gases, clutch and flywheel components, and roll cage and chassis construction in particular drag racing and other American regulated classifications.
4130 Round tube availability
Highlighted in red are standard sizes
4130 Streamline availability
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4130 is available in the following forms:
Tube / Hollow
- Oval Section
- Box Section
- Aerofoil / Streamline Section
- AMS6345 Sheet & Plate (Normalised)
- AMS 6346: Bar (Hardened & Tempered)
- AMS 6350: Sheet & Plate (Annealed)
- AMS 6351: Sheet & Plate (spheroidised)
- AMS 6370: Bar
- AMS 6371: Tube
- AISI 4130
- ASTM A322
- ASTM A331MIL-S-6758
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