Tubing

Seamless and Welded Austenitic Stainless Steel Tubing for General Service

Specifies requirements for seamless and welded austenitic stainless steel tubing for general corrosion-resisting and low- or high-temperature service. Tubing is dimensioned by actual outside diameter (OD) and wall thickness — not by nominal pipe size (NPS) — making it compatible with compression (twin-ferrule) tube fittings. Grades covered include TP304, TP304L, TP316, TP316L, TP317, TP321, and TP347 among others. This is the dominant instrument and small-bore tubing specification for process plants, refineries, and chemical facilities worldwide.

Seamless Ferritic/Austenitic Boiler, Superheater, and Heat-Exchanger Tubes

Specifies seamless ferritic (chrome-moly alloy) and austenitic stainless steel tubes for boilers, superheaters, and heat exchangers operating at elevated temperature under pressure. Ferritic grades range from simple 0.5Mo (T1) through 1.25Cr-0.5Mo (T11), 2.25Cr-1Mo (T22), up to the advanced 9Cr-1Mo-V (T91) and 9Cr-0.5Mo-1.8W-V-Nb (T92). Austenitic grades include TP304H, TP316H, TP321H, and TP347H. All tubes are seamless; welded austenitic boiler tube falls under ASTM A249. Dimensional sizing follows OD and wall thickness (not NPS/schedule).

Seamless Copper Tube

Specifies seamless copper tube for general engineering, heat transfer, and light-industrial applications where dimensional accuracy and material integrity are required. Covers copper alloys including C10200 (oxygen-free copper) and C12200 (phosphorus-deoxidised copper, the most common grade), supplied in annealed (soft) or hard-drawn temper. Tube is sized by outside diameter and wall thickness. B75 is the foundational seamless copper tube standard; plumbing (B88), refrigeration/ACR (B280), and condenser/heat-exchanger tube (B111) each have their own dedicated specifications built on similar principles.