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Application of seamless steel pipe-A335P11 alloy steel pipe in industrial projects

Views: 2     Author: Site Editor     Publish Time: 2024-10-21      Origin: Site

ASTMA335 P11 seamless steel pipe, seamless ferritic alloy steel nominal pipe for high temperature, used for heating surface, economizer, header, superheater, reheater, petrochemical industry pipe, etc. of high-pressure boiler. It belongs to the category of seamless steel pipe. The manufacturing method is the same as that of seamless steel pipe, but there are strict requirements on the steel type used to manufacture steel pipe. High-pressure boiler steel pipes are often in high-temperature and high-pressure conditions during use. Under the action of high-temperature flue gas and water vapor, the steel pipe will oxidize and corrode. The steel pipe is required to have high strength, high corrosion resistance, and good preparation stability. High-pressure boiler steel pipes are mainly used to manufacture superheater tubes, reheater tubes, gas guide tubes, main steam pipes, etc. of high-pressure and very high-pressure boilers.


①A335 P11 chemical composition: C: 0.05~0.15 Si: 0.50~1.00 Mn: 0.30~0.60 P≤0.025 S≤0.025 Cr: 1.00~1.50 Mo: 0.44~0.65

②A335 P11 high pressure boiler steel pipe mechanical properties: tensile strength ≥415Map, yield strength ≥205Mpa, elongation after fracture ≥30%,

③A335 P11 pipe for pipe fittings delivery status: fully annealed or isothermal annealed, normalized + tempered.

④A335 P11 pipe fittings pipe specifications: 60.3-765*2-120, commonly used diameters 60.3, 73, 88.9, 114.3, 168.3, 219.1, 273.1, 323.9, 355.6, 406.4, 457.2, 508, 559, 610, 660, 711, 762, can also be customized according to customer requirements.

⑤A335 P11 seamless alloy steel pipe main use: seamless alloy steel pipe for boilers, superheaters, and heat exchangers in the petrochemical industry


P11 is a low-alloy heat-resistant steel, which belongs to alloy steel. The most prominent advantage is that it is 100% recyclable. According to the manufacturing process, P11 can be divided into hot-rolled seamless steel pipe and cold-rolled seamless steel pipe. Among them, cold-rolled pipes are divided into round pipes and special-shaped pipes.


The production process of hot-rolled seamless steel pipe is round tube billet, heating, perforation, three-roller oblique rolling, continuous rolling or extrusion, tube removal, stem set, cooling, billet tube, straightening, water pressure test, marking, and storage.


The production process of cold-rolled seamless steel pipe is round tube billet, heating, perforation, heading, annealing, pickling, oiling, multi-pass cold drawing, billet tube, heat treatment, straightening, water pressure test, marking, storage,


General boiler steel pipes are mainly used to manufacture water-cooled wall tubes, boiling water tubes, superheated steam tubes, superheated steam tubes for locomotive boilers, large and small smoke pipes arch brick tubes, etc. High-pressure boiler steel pipes are mainly used to manufacture superheater tubes, reheater tubes, gas guide tubes, main steam pipes, etc. for high-pressure and very high-pressure boilers.


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