ASTM A335 Schedule 40 alloy steel seamless pipe is a kind of seamless alloy steel pipe for high temperature use, which belongs to the American ASTM standard. This kind of steel pipe is mainly used to make high-temperature and high-pressure boiler superheaters, reheaters, steam pipes and other components. It has the characteristics of high lasting strength, high oxidation resistance, good organizational stability and good process performance.
The specifications of ASTM A335 Schedule 40 alloy steel seamless pipe are: outer diameter 19.05mm~762mm, wall thickness 2mm~140mm. The chemical composition includes carbon, silicon, manganese, phosphorus, sulfur, chromium, molybdenum and other elements. The carbon content is controlled below 0.15%, and the chromium and molybdenum contents are 4.0%~6.0% and 0.45%~0.65% respectively.
The production process of this kind of steel pipe includes billet heating, rough rolling, finish rolling, natural cooling, length setting, inspection, warehousing and other steps. The billet heating temperature is controlled at 1070~1180℃, and the temperature control of rough rolling and finish rolling is respectively 1000~1100℃ and 980~1050℃.
| Standard | ASTM A335 |
| Grade | P5 |
| Schedule | 40 |
| Outer Diameter (OD) | 19.05mm - 762mm |
| Wall Thickness (WT) | 2mm - 140mm |
| Chemical Composition | Carbon ≤ 0.15%, Manganese 0.30-0.60%, Phosphorus ≤ 0.025%, Sulfur ≤ 0.025%, Silicon ≤ 0.50%, Chromium 4.0-6.0%, Molybdenum 0.45-0.65% |
| Mechanical Properties | High tensile strength, high yield strength, good ductility, impact resistance, and toughness at elevated temperatures |
| Applications | Boiler superheaters, reheaters, steam piping, and other high-temperature service applications |
