Alloy Pipes/Tubes

Alloy Steel pipe contains substantial quantities of elements other than carbon such as nickel, chromium, silicon, manganese, tungsten, molybdenum, vanadium and limited amounts of other commonly accepted elements such as manganese, sulfur, silicon, and phosphorous.

  • Chromium is added in smaller amounts (0.5-2%) to increase hardenability and larger amounts (4-18%) to increase corrosion resistance.
  • Molybdenum is added in amounts of 0.25-0.40% to increase the toughness of the steel.
  • Nickel is added in smaller amounts (2-5%) to increase toughness and in larger amounts (12-20%) to increase corrosion resistance.
  • Silicon is added to steel in smaller amounts (0.2-0.7%) to increase strength and in larger amounts (>2%) to improve its magnetic properties.


  • Hydrogen Sulfide Corrosion Services
  • NACE Applications
  • Creep Rupture Applications
  • NACE-MRO 175 Sour Service
  • hydrogen attack and embrittlement
  • Chemical Industry
  • Oil and Gas PipeLine
  • Plumbing

Alloy Steel Pipe Specification

Specifications : ASTM A, ASME SA335, A213, A691

Standard : ASTM, ASME, API

Size : 1/2″ ~ 36″

Schedule : Sch 20, Sch 30, Sch STD, Sch 40, Sch 80, Sch 160, Sch XS, Sch XXS, All Sch

Grades : ASTM A335 Gr, P5, P9, P11, P12, P21, P22, P91, ASTM A213 – T5, T9, T11, T12, T22, T91, ASTM A691

Length : Single Random, Double Random, Cut Length

Type : seamless, Welded, Fabricated, ERW, CDW

Form : Square, Round, Rectangular, Hydraulic, “U” Shape

End : Bevelled End, Threaded, Plane End

Chemical Composition

UNS Designation K11597
Carbon 0.05-0.15
Manganese 0.30–0.60
Phosphorus 0.025
Sulfur 0.025
Silicon 0.50-1.00
Chromium 1.00-1.50
Molybdenum 0.44-0.65

Mechanical Properties

Tensile strength(min) 415Mpa
Yield strength(min) 220Mpa
Elongation 30%