ASTM A335 specification covers seamless ferritic alloy-steel pipe for high-temperature service. The pipe shall be suitable for bending, flanging, and similar forming operations, and for fusion welding. Grade P2 and P12 steel pipes shall be made by coarse-grain melting practice. The steel material shall conform to chemical composition, tensile property, and hardness requirements. Each length of pipe shall be subjected to the hydrostatic test. Also, each pipe shall be examined by a non-destructive examination method in accordance to the required practices. The range of pipe sizes that may be examined by each method shall be subjected to the limitations in the scope of the respective practices. The different mechanical test requirements for pipes, namely, transverse or longitudinal tension test, flattening test, and hardness or bend test are presented.

ASTM A335 Seamless Alloy-Steel Pipe

Scope: This specification covers nominal wall and minimum wall seamless chrome moly seamless pipes for the power generation and petrochemical industries. ASTM A335 Seamless Steel Pipe ordered to this specification shall be suitable for fusion welding, bending, flanging (vanstoning), and similar forming operations. With chrome and moly element added, ASTM A335 offers good tensile strength, fine resistance to high temperature and corrosion.

ASTM A335 Grades

It covers steel grades from P1 to P5, P9, P11, P12, P91. Grades P11/P22 and P91/92 are commonly used in power stations, while A335 grade P5 and P9 are mostly used for application in the petrochemical industry.

ASTM A335 Seamless Steel Pipe Specifications:
Name: ASTM A335 alloy steel pipe
Diameter:16-1016mm
Thickness: 2---120mm
Steel grade: P1 P2 P5 P9 P11 P12 P22
Surface: oiled, black painted to prevent rust
Nansteel Manufacturing Co.,Ltd supplies a full range of the following ASTM A335 Seamless Alloy-Steel Pipe, click to check View of ASTM A335 Dimensional Table.

Applications of ASTM A335 Pipes
The most common use of grades P11, P22, and P91 is in the power industry and petro-chemical plants, Grades P5 and P9 are commonly used in refineries.

ASTM A335 is often called as chrome moly pipe because of the chemical contain of Molybdenum (Mo) and Chromium (Cr). Molybdenum increases the strength of steel and Chromium (or chrome) is the essential constituent of stainless steel.

The composition chrome moly alloy steel pipe make it ideal for use in power plants, refineries, petro chemical plants, and oil field services where fluids and gases are transported at extremely high temperatures and pressures.

Chrome moly pipe under ASTM & ASME specification A/SA 335 P1, P2, P11, P12, P15, P22, P91, P92, P122 are used for power industries whereas ASTM/ASME A/SA 335 P5, P9 are used for petrochemical industries
Strong resistance to rupturing at high temperatures and high pressures
May be used for Hydrogen Sulfide Corrosion Services
Resistant to cracking from hydrogen attack and embrittlement
Resistant to hot sulfide corrosion cracking
Can be used for NACE Applications where sour environments are under high temp and pressure
Can be used in NACE-MRO 175 Sour Service
Ideal for creep rupture applications
Can handle high temperatures with very low elasticity
Certitifcation: Chrome Moly pipe are certified as PER DIN 50049 3.1, EN 10204 3.1/3.2 and NACE MR-0175 & NACE MR-0103
Chemical Composition
These pipe bear high resistance to rupture at high temperature and pressures. With hydrogen crack resistance and sulfide stress corrosion cracking chrome moly pipe are highly preferred over Carbon pipe.