ASTM A691 Grade 91 Alloy Steel EFW Pipes  are specially designed for use in high-pressure and high-temperature environments. These pipes are widely used in industries like oil and gas, power generation, and chemical processing due to their strength and durability.

The manufacturing process starts with high-quality pressure vessel plates that offer excellent mechanical properties and resistance to extreme conditions. These plates are selected carefully to ensure the final product meets strict industry standards.

The pipes are made using the Electric Fusion Welding (EFW) process, which creates strong, seamless joints by melting and fusing the edges of the plates using electric current. This method ensures high structural integrity and allows the pipes to handle intense pressure and stress.

To guarantee performance, the pipes go through strict testing like hydrostatic testing for pressure resistance and non-destructive methods such as ultrasonic and radiographic inspection to check weld quality. These tests ensure the pipes are safe and reliable for demanding applications.

Thanks to their alloy composition, these pipes also offer excellent resistance to heat, oxidation, and corrosion. This makes ASTM A691 Grade 91 EFW Pipes a dependable choice for long-term use in tough industrial environments.

Table of Contents

1. ASTM A691 Pipe Price in India
2. ASTM A691 Pipe Equivalent
3. ASTM A691 Pipe Specifications
4. ASTM A691 Chemical Composition
5. ASTM A691 Mechanical Properties
6. Heat Treatment
7. Tensile Requirements

ASTM A691 Pipe Price in India (USD $/Ton)

Note: Prices applicable for SCH 40, SCH 60, SCH 80 & SCH XS.

ASTM A691 Pipe Equivalent Grades

ASTM A691 Pipe Specifications

• Grades: 1CR, 1-1/4CR, 2-1/4CR, 3CR, 5CR, 9CR, 91, CM65, CM70, CM75
• Sizes: 1/2” NB to 36” NB
• Wall Thickness: 3mm to 12mm
• Type: Seamless / ERW / Welded / Fabricated / LSAW
• End Type: Plain, Beveled, Threaded
• Form: Round, Square, Rectangular, Hydraulic
• Length: Standard, Double Random, Cut Length
• Manufacturing Origin: Indian, European, US, Korean, Japanese (No Chinese origin)
• Special Testing: NACE MR0175, HIC Test, SSC Test, IBR, H2 Service

ASTM A691 Chemical Composition

Grade 91 also includes: Ni ≤ 0.40%, Nb 0.06–0.10%, N 0.030–0.070%, Al ≤ 0.02%, Ti ≤ 0.01%, Zr ≤ 0.01%

 ASTM A691 Mechanical Properties