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Home > Steel Pipe> A691 1-1/4CR Alloy Steel EFW Pipes
A691 1-1/4CR Alloy Steel EFW Pipes image
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A691 1-1/4CR Alloy Steel EFW Pipes

Class Designation: Class 11, 12, 22, 23, 30, 31, 32, 33, 34, 60...

Outer Diameter: 457-1422mm

Wall Thickness: 2-60mm

Length: Single random length/Double random length

Application: Used in extraction gas or steam line and crude oil distillation units in temperatures that would cripple traditional carbon steels up to 1050ºF (565.6ºC )

ASTM A691 Gr.1 1/4 CR ERW Pipe Alloy A691 ERW Pipe ASME SA691 Gr.1 1/4 CR Seamless Pipe ASTM A691 Gr.1 1/4 CR Welded Pipe

A691 1-1/4 CR EFW Pipe Supplier And Manufacturer 

ASTM A691, Standard Specification for Carbon and Alloy Steel Pipe, Electric-Fusion-Welded for High-Pressure Service at High Temperatures. As a type of chrome molybdenum alloyed pipe, SA A691 Grade1 1/4 Cr containing 1.25% chromium and 1.5% molybdenum made from A387/A387M grade 11 plate.

A691 1-1/4 CR Alloy Steel EFW Pipes Specification

Type ASTM A691 1-1/4CR, 2-1/4CR, 5CR, 9CR, 91 LSAW / SAW / EFW Pipe
Grades 1-1/4CR, 2-1/4CR, 5CR, 9CR, 9, P5, P9, P11, P12, P22, P91
ASTM A691 Standard Specification for Carbon and Alloy Steel Pipe, Electric-Fusion-Welded for High-Pressure Service at High Temperatures
Class Designation Class 10, 11, 12, 13, 20, 21, 22, 23, 30, 31, 32, 33, 34, 40, 41, 42, 43, 50, 51, 52, 53, 60, 61, 62, 63, 70, 71, 72, 73.
Outer Diameter Seamless  17-914 mm (3/8-36 inch)
LSAW 457-1422 mm (18-56 inch)
Wall Thickness 2-60mm
SCH10 SCH20 SCH30 STD SCH40 SCH60 XS SCH80 SCH100 SCH120 SCH140 SCH160 XXS
Length Single random length/Double random length
5m-14m, 5.8m, 6m, 10m-12m, 12m, or as customer’s actual request
Surface Treatment Bare, painted black, varnished, galvanized, anti-corrosion
PE PP/EP/FBE coating
Technical Methods Hot-rolled/Cold-drawn/Hot-expanded
Testing Methods Eddy current testing, Hydrostatic testing or Ultrasonic examination, NDT and also with chemical and physical property inspection
Packaging Small pipes in bundles with strong steel strips, large pieces in loose form; Covered with plastic woven bags; Suitable for lifting operation; Loaded in 40ft or 20ft container or in bulk
Also, according to the customer’s requests
Application Conveying oil, gas and water

ASTM A691 1-1/4 CR Pipe Application

  • Oil and Gas equipment
  • Offshore Technology
  • Seawater Desalination Plants
  • Chemical Industry
  • Airports, Malls, Buildings
  • Storage Tanks
  • Medical Industry
  • Civil Engineering
  • Pressure vessels, Reactor tanks, and Heat exchangers
  • Rotors, impellers and shafts
  • Power Plants
  • Petrochemical
  • Shipbuilding Industry
  • Mining Industry
  • Food Equipment Industry
Specification Parameters
Basic Information

Chemical Composition of A691 1-1/4CR, 2-1/4CR, 5CR, 9CR, 91 Alloy Steel EFW Pipes
(cast analysis, % by mass, maximum permitted unless indicated otherwise)

1CR 1-1/4CR 2-1/4 CR 5 CR 9 CR 91
C 0.05-0.17 0.05-0.17 0.05-0.15 0.15 0.15 0.08-0.12
Mn 0.40-0.65 0.40-0.65 0.30-0.60 0.30-0.60 0.30-0.60 0.30-0.60
P 0.025 0.025 0.025 0.025 0.025 0.020
S 0.025 0.025 0.025 0.025 0.025 0.010
Si 0.15-0.40 0.50-0.80 0.50 0.50 1.00 0.20-0.50
Cr 0.80-1.15 1.00-1.50 2.00-2.50 4.00-6.00 8.00-10.00 8.00-9.50
Mo 0.45-0.60 0.45-0.65 0.90-1.10 0.45-0.65 0.90-1.10 0.85-1.05
V – – – – 0.04 0.18-0.25

*Grade 91 also includes restrictions on Nickel 0.40 max, Columbium 0.06-0.10, Nitrogen 0.030-0.070, Aluminium 0.02 max, titanium 0.01 max, Zirconium 0.01 max.

Tensile Requirements of A691 1-1/4CR, 2-1/4CR, 5CR, 9CR, 91 Alloy Steel EFW Pipes

Class 1

Grade Tensile (MPa) Yield (MPa) Elong. (50mm) Reduc’n of Area*
1CR 380 – 550 230 min 22% min –
1-1/4CR 415 – 585 240 min 22% min –
2-1/4CR, 5CR, 9CR 415 – 585 205 min 18% min 40% min
91 415 – 585 205 min 18% min 40% min

* Measured on a flat specimen

Class 2

Grade Tensile (MPa) Yield (MPa) Elong. (50 mm) Reduc’n of Area*
2 485 – 620 310 min 22% min –
1-1/4CR 515 – 690 310 min 22% min –
1CR 450 – 585 275 min 22% min –
2-1/4CR, 5CR, 9CR 515 – 690 310 min 18% min 40% min
91 585 – 760 415 min 18% min –
Service Support
A691 1-1/4CR Alloy Steel EFW Pipes

Types of Packaging:

  • – Bundles (hexagonal)
  • – Wooden Boxes
  • – Crates (steel/wooden)
  • – Special crates for U-Bend tubes with each radius separated
  • – Packaging for A691 1-1/4CR, 2-1/4CR, 5CR, 9CR, 91 Alloy Steel EFW Pipe as per customer’s requirements
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