ASTM A312 TP347H Pipe

1. Standard: ASTM A213, ASME SA312
2. Size: 1/2''~48''
3. Thickness: SCH5~SCHXXS
4. Service: Cutting, Welding, Fabricated, Customized

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Product Introduction

ASTM A312 TP347H Pipe, which is a high-carbon version of the Alloy 347. 1.4961 stainless steel is a stabilized austenitic stainless steel alloy containing chromium, nickel, columbium (niobium), and a higher carbon content compared to 347. AISI 347H is specifically designed for high-temperature applications where elevated mechanical properties are required. The higher carbon content improves the high-temperature strength and creep resistance of 347H, making it suitable for service temperatures above 1000°C (1832°F).

ASTM A312 UNS S34709 Pipe Applications:

Power Generation
Chemical Processing
Refining Industry
Thermal Processing
Heat Exchangers
Aerospace and Defense

ASTM A312 TP347H Chemical Composition

Element	SUS 347H
Chromium	17.00 min.-19.00 max.
Nickel	9.00 min.-13.00 max.
Carbon	0.04 min.-0.10 max.
Manganese	2.00
Phosphorus	0.045
Sulfur	0.03
Silicon	0.75
Columbium & Tantalum	8 x (C + N) min.-1.00 max.
Iron	Balance

ASTM A312 Gr 347H Seamless Pipe Mechanical Properties

HeatTreatment		Solution
Temperure	Min.	1900 (1040) º F(º C)
Tensile Strength	Ksi (MPa), Min.	75(515)
Yield Strength	Ksi (MPa), Min.	30(205)
Elongation %, Min		35

ASME SA312 TP347H Welded Pipes Physical Properties

Properties	Metric
Density	7.96 g/cm³

Stabilization:

Both TP347 and TP347H are stabilized austenitic stainless steel alloys, meaning they contain elements such as columbium (niobium) and tantalum to prevent sensitization and intergranular corrosion. However, Type 347H is often preferred for applications involving sustained high temperatures due to its higher carbon content, which provides additional stabilization at elevated temperatures.