A672 GR C70

ASTM A672 C70 pipes are available in a wide range of sizes, with outer diameters ranging from 16 inches (405 mm) to 100 inches (2540 mm) and wall thicknesses from 6.4 mm to 150 mm. The pipes conform to various schedules, including SCH 40, SCH 80, SCH 120, and SCH 160. They can be customized for specific project requirements with single, double random, or custom lengths of up to 13 meters. The end types include beveled, plain, and threaded ends, with additional protection provided by plastic caps.

The mechanical properties of ASTM A672 Grade C70 pipes are tailored for high-pressure environments:

• Yield Strength: Minimum 260 MPa
• Tensile Strength: Minimum 485 MPa
• Elongation: 21%
  The chemical composition includes Carbon (C: 0.27%), Manganese (Mn: up to 1.30%), Silicon (Si: up to 0.45%), and trace elements like Phosphorus and Sulfur (max 0.035%).

These pipes are extensively used in industries requiring high-pressure resilience at atmospheric or lower temperatures. Key applications include:

• Oil and Gas: Transporting hydrocarbons under high pressure.
• Power Plants: Steam distribution and boiler components.
• Petrochemical and Fertilizer Industries: Handling corrosive chemicals and gases.
• Marine and Shipbuilding: Structural integrity in ship construction.

The electric fusion welding process enhances strength and ensures uniformity, making them durable and suitable for critical environments. Pre-heating before welding and filler materials allow compatibility with other grades of pipes.

ASTM A672 C70 pipes are categorized into different classes based on heat treatment and testing requirements:

• Class 12: No heat treatment, with radiographic testing (RT) as per section 9.
• Class 22: Stress-relieved with RT and pressure testing.
• Class 32: Normalized for enhanced durability, subjected to RT and hydrostatic testing.

These stringent testing protocols ensure reliability under extreme operating conditions.

To combat corrosion and extend service life, these pipes can be treated with black painting, varnish, galvanized coating, or 3LPE (Three-Layer Polyethylene) coating. Packaging options include bundles, wooden crates, or custom solutions to ensure damage-free transportation.