Grade LF1 is part of the ASTM A350 standard, which encompasses valves, flanges, fittings, and other components exposed to pressure and temperature conditions. This standard pertains to carbon and low-alloy steel materials. Grade LF1 is classified under forged steels.
The buyer is responsible for specifying the grade of items such as valves, fittings, flanges, etc., that need to be procured. This selection depends on the design requirements, operating conditions, mechanical properties, high-temperature specifications, or corrosion resistance characteristics.
All grades under ASTM A350, including LF1, LF2, LF3, LF5, LF6, LF9, and LF787, must undergo appropriate heat treatment to meet the required design and chemical specifications.
Grade LF1, categorized as forged steel, possesses chemical properties outlined in the following table
| Carbon | Manganese | Phosphorus | Sulfur | Silican | Nickel | Chromum | Molybdenum | Copper | Columbium | Vanadium | Nitrogen |
| 0.3 | 0.6-1.35 | 0.35 | 0.04 | 0.15-0.3 | 0.4 | 0.3 | 0.12 | 0.4 | 0.02 | 0.05 | —– |
| TENSILE STRENGTH KSI (Mpa) | Yield strength ksi (Mpa) | Elongation in 2in. Or 50mm |
| 60-85 (415-585) | 30 (205) | 25 |
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