Chemical Composition (Typical wt.%) Element 347 347H Carbon (C) ≤0.08 0.04-0.10 Chromium (Cr) 17.00-20.00 17.00-20.00 Nickel (Ni) 9.00-13.00 9.00-13.00 Niobium (Nb) 10×C-1.00 10×C-1.00 Molybdenum (Mo) ≤0.75 ≤0.75 Iron (Fe) Balance Balance

Mechanical Properties (Annealed Condition) Property 347 347H Tensile Strength ≥515 MPa ≥515 MPa Yield Strength ≥205 MPa ≥205 MPa Elongation ≥35% ≥35% Hardness ≤201 HB ≤201 HB

High-temperature piping systems Furnace components Heat exchangers Boiler and superheater tubes Petrochemical equipment Aerospace components Thermal processing equipment

Chemical Composition (Typical wt.%) Element 347 347H Carbon (C) ≤0.08 0.04-0.10 Chromium (Cr) 17.00-20.00 17.00-20.00 Nickel (Ni) 9.00-13.00 9.00-13.00 Niobium (Nb) 10×C-1.00 10×C-1.00 Molybdenum (Mo) ≤0.75 ≤0.75 Iron (Fe) Balance Balance

Mechanical Properties (Annealed Condition) Property 347 347H Tensile Strength ≥515 MPa ≥515 MPa Yield Strength ≥205 MPa ≥205 MPa Elongation ≥35% ≥35% Hardness ≤201 HB ≤201 HB

High-temperature piping systems Furnace components Heat exchangers Boiler and superheater tubes Petrochemical equipment Aerospace components Thermal processing equipment

347/347H Stainless Steel Coil

Grade: 347/347H/UNS S34700/UNS S34709/W.Nr 1.4550/W.Nr 1.4908

Hot rolled: 3mm-16mm

Cold Rolled: 0.3mm-3.0mm

Width: 1.0m/1.22m/1.5m/1.8m/2.0m/2.2m or as client’s requirement.

Standard: ASTM A240/A240M, JIS G4304, JISG 4305, EN 10088/3

Finish: 2B, 8K, HL, 240#, No.1, 1D

347 and 347H are niobium-stabilized austenitic stainless steels designed for high-temperature service. Niobium prevents chromium carbide precipitation during welding and elevated-temperature exposure. 347H contains higher carbon content, providing improved creep resistance and high-temperature strength for long-term service.

Chemical Composition (Typical wt.%)

Element	347	347H
Carbon (C)	≤0.08	0.04-0.10
Chromium (Cr)	17.00-20.00	17.00-20.00
Nickel (Ni)	9.00-13.00	9.00-13.00
Niobium (Nb)	10×C-1.00	10×C-1.00
Molybdenum (Mo)	≤0.75	≤0.75
Iron (Fe)	Balance	Balance

Mechanical Properties (Annealed Condition)

Property	347	347H
Tensile Strength	≥515 MPa	≥515 MPa
Yield Strength	≥205 MPa	≥205 MPa
Elongation	≥35%	≥35%
Hardness	≤201 HB	≤201 HB

High-temperature piping systems
Furnace components
Heat exchangers
Boiler and superheater tubes
Petrochemical equipment
Aerospace components
Thermal processing equipment

Introduction

Specification

Chemical Composition (Typical wt.%)

Element	347	347H
Carbon (C)	≤0.08	0.04-0.10
Chromium (Cr)	17.00-20.00	17.00-20.00
Nickel (Ni)	9.00-13.00	9.00-13.00
Niobium (Nb)	10×C-1.00	10×C-1.00
Molybdenum (Mo)	≤0.75	≤0.75
Iron (Fe)	Balance	Balance