About ASTM A335 P22 Pipe
Trade Name: 2 ¼ Chrome
Grade: P22
UNS #: K21590
Pipe: A335/SA335
Forged/Bored Pipe: A369/SA369
A335/SA335 Grade P22 Alloy Steel Seamless Pipes are Carbon steel pipes with addition of chromium, molybdenum, and sometimes vanadium. Chromium, or chrome, improves high-temperature strength, increases oxidation resistance and raises the tensile, yield and hardness at room temperatures. Molybdenum increases the strength, elastic limit, resistance to wear, impact qualities and hardenability. It increases the resistance to softening, restrains grain growth and makes chromium steel less susceptible to embrittlement. Moly is also the most effective additive for increasing high temperature creep strength, or creep resistance, and it also enhances the corrosion resistance of steel and inhibits pitting. Grade P22 is used for high temperature service applications and is tolerant to variations in its microstructure.
P22 Pipe Chemical Requirements
Carbon - 0.05% - 0.15%
Manganese - 0.30% - 0.60%
Phosphorus, max - 0.025%
Sulfur, max - 0.025%
Silicon, max – 0.50%
Chromium - 1.90% - 2.60
Molybdenum - 0.87% - 1.13%
P2 Pipe Specifications
Tensile strength, min, PSI, (MPa) – 60,000 (415)
Yield Strength, min, (MPa) – 30,000 (205)
P22 Pipe Applications
P22 is suitable for high temperature environments including those found in the following industries:
Pharmaceutical equipment
Chemical equipment
Sea water equipment
Heat exchangers
Condensers
Pulp and paper industry
Off-shore oil drilling companies
Power generation
Petrochemicals
Gas processing
Specialty chemicals
Related informations:
European Standards for steel
ASTM Standards for steel pipes
JIS Seamless Pipe
Tubes for Mechanical and Automobile
ASTM A335 Pipe Specifications
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