ASTM A266 / A266M

ASTM A266 is a material specification for Carbon Steel forged products such as flanges, pipe fittings, valve component, rings, round bars and many other forging parts, used for boilers, pressure vessels & associated equipment. ASTM A266 covers four grades of carbon steel. ASTM A266 product can be ordered either to dimensions specified by the buyer or to dimensional standards such as ANSI, ASME, API or MSS.

Chemical Properties

Grade Carbon Manganese Phosphorus Sulphur Silicon
1 & 2 0.30 max 0.40 - 1.05 0.025 max 0.025 max 0.15 - 0.35
3 0.35 max 0.80 - 1.35 0.025 max 0.025 max 0.15 - 0.35
4 0.30 max 0.80 - 1.35 0.025 max 0.025 max 0.15 - 0.35

Mechanical Properties

Grades Tensile Strength, ksi Yield Strength, ksi Elongation, % Reduction of Area, %
1 60 - 85 30 min 23 min 38 min
2 & 4 70 - 95 36 min 20 min 33 min
3 75 - 100 37.5 min 19 min 30 min

Products