ASTM B622 UNS N08031 Alloy 31 Seamless Pipe Sch40

ASTM B622 UNS N08031 Alloy 31 Seamless Pipe Sch40

MTSCO——Your Trusted Partner in Industrial Piping

Established in 2006, MTSCO is a comprehensive solution provider for global industrial piping systems. We integrate manufacturing capabilities through a "factory group" model, focusing on the precision manufacturing of high nickel alloys and special stainless steels. From raw material entry to final delivery, MTSCO maintains a complete ISO quality management system and global logistics coordination, providing precise piping support for large-scale projects. For urgent stock or cut-to-length requirements, please contact us. Every choice is an efficiency boost—inquire now to learn about our delivery capabilities.

Piercing Process

Piercing is the first critical step in converting solid round billets into hollows. The billet must be heated to approximately 1200℃ to ensure plasticity before being formed into a hollow shape under cross-rolling and a mandrel. Improper control during this stage can easily lead to wall eccentricity or internal cracks. MTSCO utilizes high-precision piercing units to strictly control rolling angles and speeds. This ensures high concentricity and uniform wall thickness for the hollows, eliminating peeling defects at the source and laying a solid quality foundation for the subsequent cold rolling process.

Specifications at a Glance

Inspection Methods

ASTM B622 explicitly requires hydrostatic testing or nondestructive electric testing for nickel alloy seamless pipes. For high-value alloys like UNS N08031, subcutaneous cracks or inclusions must be eliminated. MTSCO conducts 100% Ultrasonic Testing (UT) and Eddy Current Testing (ET) on every finished pipe, complemented by PMI test to verify chemical composition. This comprehensive QC process ensures that every batch from MTSCO successfully passes on-site Third-Party Inspection.

Where Can Our Alloy 31 seamless pipe Perform?

Alloy 31 seamless pipes are widely used in Flue Gas Desulfurization (FGD) systems, phosphoric acid production equipment, pulp bleaching, and fine chemical heat exchangers. These conditions often involve high temperature, high pressure, and strong acid corrosion, demanding extreme erosion resistance. MTSCO supplies seamless pipes for such harsh environments that undergo strict flattening and flaring tests. We ensure every delivered pipe maintains stable physical properties during long-term acidic medium transport, helping EPC contractors reduce maintenance frequency.

FAQ

Q1: What length of seamless pipe can you provide?

A1: We supply a wide range of dimensions. Beyond standard lengths, thanks to advanced equipment at our holding factory, we can provide extra-long pipes up to 25 meters. This helps reduce the number of welds in your project and improves overall system reliability.

Q2: Can the length and end finish be customized?

A2: Yes. MTSCO can provide different lengths and end finishes, such as Plain Ends (PE) or Beveled Ends (BE), according to customer requirements to ensure convenient construction.

Q3: Can you provide matching fittings or flanges for N08031?

A3: Yes. MTSCO offers "one-stop" piping system solutions. We can supply matching fittings and flanges in the same material to ensure material consistency and welding compatibility across the entire piping system.