ASTM A335 P22 Seamless Ferritic Alloy-Steel Pipe
ASTM A335 P22 Seamless Ferritic Alloy-Steel Pipe is 2.25cr-mo high temperature ferritic steel pipe for boiler and superheater. furnished in the normalized and tempered condition, the minimum tempering temperature are 1250°F [675°C].

Description

ASTM A335 P22 Seamless Ferritic Alloy-Steel Pipe

Standard:ASTM A 335/A 335M
Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
ASTM A335 P22 Seamless Ferritic Alloy-Steel Pipes cover nominal (average) wall seamless alloy-steel pipe intended for high-temperature service.

ASTM A335 P22 Steel

P22 is the steel grade in ASTM A335 alloy seamless steel pipe standard. P22 is 2.25cr-mo high temperature ferritic steel for boiler and superheater.
The thermal strength of ASTM A335 P22 steel is relatively high, and its creep rupture strength and allowable stress at the same temperature (temperature ≤ 580 ℃) are even higher than that of 9Cr Mo steel, and it has good processability and weldability, and good durable plasticity. Therefore, it has been widely used in the harsh working environment, such as in thermal power, nuclear power and some hydrogen equipment, such as various heating pipe belts and high-pressure vessels. ASTM A335 P22 steel has been widely used in the United States, Japan and Europe. ASTM A335 P22 steel is a mature steel with stable performance and good process performance.

Equivalent steel grade

Grade Standard Country
STBA24 JIS G3462 Japan
10CrMo910 DIN 17175 Germany
12Cr2MoG GB/T 5310 China

Heat Treatment:
Grade P22 Seamless Ferritic Alloy-Steel Pipe will be reheated and furnished in the full-annealed, isothermal annealed, or normal-ized and tempered condition. If furnished in the normalized and tempered condition, the minimum tempering temperature are 1250°F [675°C].

Chemical Composition of ASTM A335 P22

Grade Chemical Composition(%)
C Mn P S Si Cr Mo
P22 ≤0.015 0.30-0.60 ≤0.025 ≤0.025 ≤0.50 1.90-2.60 0.87-1.13

Mechanical Properties of ASTM A335 P22

Grade Mechanical property
Tensile Strength(MPa) Yield Strength(MPa) Elongation(%)
P22 ≥415 ≥205 ≥30

Outside diameter tolerances of ASTM A335 Seamless Ferritic Alloy-Steel Pipe

NPS Designator Over Under
in. mm in. mm
1⁄8 to 1 1⁄2 , incl. 1 ⁄ 64 (0.015) 0.40 1 ⁄ 64 (0.015) 0.40
Over 1 1⁄2 to 4, incl. 1 ⁄ 32 (0.031) 0.79 1 ⁄ 32 (0.031) 0.79
Over 4 to 8, incl. 1 ⁄ 16 (0.062) 1.59 1 ⁄ 32 (0.031) 0.79
Over 8 to 12, incl. 3 ⁄ 32 (0.093) 2.38 1 ⁄ 32 (0.031) 0.79
Over 12 ± 1 %