ASTM A312 TP347H Stainless Steel Studded Tubes For Industrial Process Heating

ASTM A312 covers seamless, straight-seam welded, and heavily cold worked welded austenitic stainless  steel pipe intended for high-temperature and general  corrosive service. ASTM A312 TP347H (stabilized austenitic stainless steel with Nb/Cb addition) is a high-temperature, corrosion-resistant alloy widely applied in industrial process heating systems due to its creep resistance, oxidation resistance, and strength at elevated temperatures. ASTM A312 TP347H stainless steel pipes are suitable for refinery & chemical heating processes with corrosive gases. With Niobium (Nb) element, can prevents sensitization & intergranular corrosion in weld zones.

In a short, A312 TP347H stainless steel pipes are ideal for high-temperature process heating in petrochemical, refining, power, and chemical industries,etc., especially where creep resistance, oxidation resistance, and weld stability are critical.

Chemical Composition (%)

^J The columbium content shall be not less than eight times the carbon content and not more than1.0%.

Mechanical Properties

Studded fin tubes significantly increase the surface area for heat transfer compared to other finned tubes. Studded fin tubes are made by welding specially formed studs (round pins) onto the surface of a base tube. Typically formed with materials such as carbon steel, stainless steel, alloy or copper, providing durability and resistance to corrosion.

A312 TP347H stainless steel studded fin tubes are used in high-temperature, corrosive, and high-pressure process heating systems where standard carbon steel or lower-grade stainless steels fail. With niobium (Nb) element-stabilized austenitic structure, which provides excellent creep resistance, oxidation resistance, and mechanical strength at elevated temperatures (up to 900°C / 1652°F).

Primary Applications in Industrial Process Heating

Petrochemical & Refinery Heaters

Cracking Furnaces (Ethylene, Steam Crackers)
Hydrogen Reformers & Hydroprocessing Heaters

Power & Energy (Waste Heat Boilers, HRSGs)

Superheaters & Reheaters (TP347H handles high-pressure steam >550°C).
Exhaust Gas Ducting in gas turbine combined cycles.

Chemical Process Heating

High-Temperature Reactors & Thermal Oil Heaters
Syngas & Ammonia Production Heaters

Food, Pharma & Pulp/Paper Industry

Sterilization Systems & High-Temp Fluid Transfer
Recovery Boilers in Paper Mills (resists corrosion from black liquor).

Specifications