Description

ASTM A335 Grade P22 Alloy Steel Seamless Pipe

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.

ASTM A335 Standard Specification

ASTM A335 specificaton covers nominal wall and minimum wall seamless ferritc alloy-steel pipe intended for high-temperature services. The pipe ordered to this specification shall be suitable for bending, flanging (vanstoning), and similar formtion operations, and for fusion welding. Selection will depend upon design, mechnical properties, service conditions and high-temperature characteristics. Ferritic steels in this specification are defined as low-and intermediate-alloy steels containing up to and including 10% chromium.

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)
ASTM A335 Grade P22 Alloy Steel Seamless Pipe

PIPE 6IN S40 A335 P22 Marking

Referred standards for making ASTM A335 P22 Pipe

a. ASTM A999/ A999M, Standard specification for common requirements for stainless and alloy steel pipe
b. ASTM A92, Hardness test methods for steel materials
c. E213, Instructions and practice for ultra sonic testing of steel pipe and tube
d. E309 Eddy-Current Examniation methods for steel pipe products
e, E381, Inspection methods for steel bars, beams, profiles, billets and forgings.
f, E527, Numbering metals and alloys practices
g, E570, Instructions for flux leakage examniation of ferromagnetic steel pipe products

Dimension standard: ASME B36.10M
Manufacturing process: Hot finished or Cold drawn
Heat treatment methods:

Full or isothermal anneal or normalize and temper or subcritical anneal
Normalize and temper

Tests

Tensile tests: Transverse and Longitudinal
Flattening test
Hardness test
Bend Test

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

Call C&N HongCheng today to learn more about our Chrome Moly Alloy Seamless P22 Pipe inventory.