ASTM A691 grade 1 1/4Cr alloy welded steel pipe

ASTM A691 is a standard specification for electric-fusion-welded (EFW) carbon and alloy steel pipes designed for high-pressure service at elevated temperatures. This specification covers chrome-molybdenum alloyed pipes that offer excellent strength and durability under extreme conditions. The SA A691 Grade 1 1/4Cr variant is composed of 1.25% chromium and 1.5% molybdenum, providing enhanced corrosion and oxidation resistance, especially in high-temperature environments. Made from A387/A387M Grade 11 plate, it’s widely used in industries requiring reliable performance in aggressive applications.

Key Specifications of ASTM A691 Grade 1 1/4Cr

- Class Designations:

Various class options, including Class 11, 12, 22, 23, 30, 31, 32, 33, 34, and 60, allowing customization for specific strength and service requirements.

- Outer Diameter:

457 to 1422 mm, accommodating a range of industrial piping needs.

- Wall Thickness:

2 to 60 mm, offering flexibility in structural strength depending on application demands.

- Length Options:

Available in single random and double random lengths to suit various installation setups.

- Applications:

ASTM A691 Grade 1 1/4Cr alloy steel pipes are specially designed for high-stress applications where temperatures could damage standard carbon steel pipes. They are ideal for:

Extraction Gas or Steam Lines: Resilient under high heat and pressure, making them suitable for gas and steam transport in extraction processes.

Crude Oil Distillation Units: Withstanding temperatures up to 1050ºF (565.6ºC), these pipes perform effectively in distillation processes where consistent thermal and mechanical integrity is required.

With their high chromium and molybdenum content, ASTM A691 Grade 1 1/4Cr pipes provide excellent strength and oxidation resistance, making them a dependable choice for high-pressure, high-temperature industrial applications.

ASTM A691 Grade1 1/4 Cr Alloy Welded Steel Pipe Chemical Analysis:

ASTM A691 Grade1 1/4 Cr Alloy Welded Steel Pipe Physical Property: