347H stainless steel is an austenitic heat-resistant steel stabilized with niobium (Nb), combining corrosion resistance, weldability, and high-temperature strength. Its chemical composition requires niobium content to be 8 times or more than the carbon content (Nb ≥ 8C - 1.00), significantly enhancing its intergranular corrosion resistance while maintaining stable performance in high-temperature environments ranging from 427°C to 816°C.
This material is widely used in large-scale boiler superheaters, reheaters, steam pipelines, and petrochemical heat exchanger components, with finished product forms including seamless pipes, hot-rolled plates, and bars, available in outer diameters ranging from Φ6mm to Φ630mm.
Specification
Size : OD: 1/2"-2000mm WT: 0.59-40mm, Length: 0.5mtr-20mtr
Standard & Grade : ASTM A312,ASME SA312/SA312M Grade 304, 304L, 310S, 316, 316L, 321, 347, 410, 904L, 347H, 316Ti, 317, 317L
ASTM A312 Gr. 347H Stainless Steel SMLS Pipes, ASTM A358 TP347H Stainless steel EFW pipes /smls Pipes & Tubes, ASTM A358 /A249/ A269/ ASME SA312 TP 347H Stainless steel tubes and Pipes in Welded;
Tubing End: Bevel end, Plain end; Threaded;
Chemical Composition of ASME SA312 347H Steel tube / ASTM A312 347H Stainless Steel tubes:
Mechanical Properties of ASME SA312 347H Steel tube / ASTM A312 347H Stainless Steel tubes:
Grade Specifications of ASME SA312 347H Steel tube / ASTM A312 347H Stainless Steel tubes:
