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Alloy 347 and 347H is a kind of high carbon Niobium Stabilized Austenitic stainless steel with the addition of Niobium. The addition of element Nb, making TP347H has a good intercrystalline corrosion resistance, especially to corrosive media such as acid, alkali and salt. It is widely used in heat exchanger, superheater pipe, reheater pipe, steam pipe in boiler of power generation, petroleum, chemical industry, synthetic fiber, food and paper industry. The element Nb is less vulnerable to burning loss than Ti, so it can be used as the welding rod for Cr-Ni Austenitic stainless steel. Similar to 18-8 Austenitic stainless steel which containing Ti, Grade 347H has higher high temperature strength and better oxidation resistance than 316 stainless steel.

Stainless steel 347/347H equivalent grade：
Available Forms and Specifications:
Chemical composition:

1.4550/ 1.4912

UNS S34700/ S34709

AISI 347/347H

TP 347/347H

SUS 347/347H

X6CrNiNb18-10/ X7CrNiNb18-10

GB 0Cr18Ni11Nb/ 1Cr19Ni11Nb

Grade 347H steel pipe & tube: ASTM A 213, A312, A 269; AMS 5556,  5558, 5575, 5571

Grade347H sheet & plate: ASTM A240; AMS 5512

Grade 347H round bar: ASTM A 276, A479

Grade 347H forging: ASTM A182

Alloy 347 and 347H is generally used where require severe corrosive conditions such as superheater pipe, reheater pipe, steam pipe for large boiler and heat exchanger, oil refineries for petrochemical processing.