Overview
Alloy 347 (UNS S34700) is columbium stabilized austenitic stainless steel with good general corrosion resistance and somewhat better resistance in strong oxidizing conditions than 321 (UNS S32100). It has excellent resistance to intergranular corrosion after exposure to temperatures in the chromium carbide precipitation range of 800 – 1500°F (427 – 816°C). The alloy has good oxidation resistance and creep strength to 1500°F (816°C). It also possesses good low temperature toughness.
Alloy 347H (UNS S3409) stainless steel is the higher carbon (0.04 – 0.10) version of the alloy. It's developed for enhanced creep resistance and for higher strength at temperatures above 1000°F (537°C). In most instances, the carbon content of the plate enables dual certification.
Specification
ASTM A213/A213M-21a Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes.
347H Stainless Steel Pipe & Tubes Specification | ASTM A269, ASTM A213, ASTM A312, ASME SA269, ASME SA213, ASME SA312 |
347H Stainless Steel Pipe & Tubes Grades | 202, 304, 304L, 304H, 304LN, 309S, 310S, 316, 316L, 316H, 316Ti, 316LN, 317L, 321, 321H, 347, 347H, 904L, SMO 254, ALLOY 254, 6MO, 6MOLY, UNS S31254 ETC. |
347H Stainless Steel Pipe & Tubes Type | Seamless / Welded / ERW / EFW / Cold Draw / Hot Finish / Cold Finish |
347H Stainless Steel Pipe & Tubes Outer Diameter Size | Seamless - 1/2"NB TO 18"NB |
347H Stainless Steel Pipe & Tubes Wall Thickness | Schedule 10 to Schedule 160 (3 mm to 100 mm Thickness) |
347H Stainless Steel Pipe & Tubes Length | 01 Meter to 12.5 Meters, Single Random Length, Double Random Length And Customize Size. |
347H Stainless Steel Pipe & Tubes Ends | Plain Ends / Beveled Ends |
347H Stainless Steel Pipe & Tubes Delivery Conditions | As Rolled, Formed, Stress Relieved, Annealed, Hardened, Tempered, Cold Draw |
347H Stainless Steel Pipe & Tubes Coating | Electropolish, Mechanical Polish, Satin Finish, Passivated |
347H Stainless Steel Pipe & Tubes Other Testing | Product Analysis, Transverse Tension Test, Flattening Test, Etching Test, Radiograph HIC Examination, Stabilizing Heat Treatment, Intergranular Corrosion Test, Weld Decay Test, Magnetic Particle Detection, Grain Size Test, NACE 0175, Dual Grade, PWHT (POST WELD HEAT TREATMENT), Flare Test, Bend Test, Hardness Test, Tensile Test etc |
347H Stainless Steel Pipe & Tubes Material Test Certificate | Manufacturer Test Certificate As Per EN10204 3.1, 3.2 / Laboratory Test Certificate From NABL Approved Lab. / Under Third Party Inspection Agency Like SGS, TUV, DNV, LLOYDS, ABS ETC |
Chemical Composition
Element | 347 | 347H |
Chromium | 17.00 min.-19.00 max. | 17.00 min.-19.00 max. |
Nickel | 9.00 min.-13.00 max. | 9.00 min.-13.00 max. |
Carbon | 0.08 | 0.04 min.-0.10 max. |
Manganese | 2.00 | 2.00 |
Phosphorus | 0.045 | 0.045 |
Sulfur | 0.03 | 0.03 |
Silicon | 0.75 | 0.75 |
Columbium & Tantalum | 10 x (C + N) min.-1.00 max. | 8 x (C + N) min.-1.00 max. |
Iron | Balance | Balance |
Mechanical Properties
Yield Strength | Ultimate Tensile Strength | Elongation in 2 in. | Hardness | ||
psi(min.) | (MPa) | psi(min.) | (MPa) | %(min.) | (max.) |
30,000 | 205 | 75,000 | 515 | 40 | 201 Brinell |
Applications
1. Aerospace.
2. Laboratory benches & equipment.
3. Coastal architectural panelling, railings & trim.
4. Boat fittings.
5. Chemical Processing.
6. Heat Exchangers.
7. Woven or welded screens for mining, quarrying & water filtration.
8. Threaded fasteners.
9. Springs.
