Stainless Steel 347 and 347H are high-performance austenitic stainless steel alloys known for their exceptional corrosion resistance and elevated temperature stability. These alloys belong to the family of heat-resistant stainless steels and are widely utilized in various industrial applications, particularly in environments where exposure to high temperatures and corrosive elements is common.
Composition and Properties: Stainless Steel 347 is essentially a stabilized version of Stainless Steel 304, containing additions of columbium (niobium) and tantalum. These stabilizing elements enhance the alloy's resistance to intergranular corrosion, making it suitable for applications involving prolonged exposure to high temperatures. On the other hand, Stainless Steel 347H is the high-carbon version of 347, offering improved high-temperature strength.
Both alloys exhibit excellent mechanical properties, such as high tensile strength, toughness, and hardness, making them suitable for a wide range of applications, including the production of bars.
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Bars and Their Applications: Bars made from Stainless Steel 347 and 347H are highly sought after in various industries due to their unique combination of properties. These bars are available in different forms, including round bars, square bars, and hexagonal bars, providing versatility for different applications.
The bars find extensive use in industries such as chemical processing, petrochemical, power generation, and aerospace, where they are employed in the manufacturing of valves, fittings, pumps, and other critical components. The corrosion resistance of these alloys ensures longevity and reliability in harsh operating conditions.
Heat Treatment and Machinability: Stainless Steel 347 and 347H bars can be subjected to various heat treatment processes to optimize their mechanical properties. Annealing, solution annealing, and quenching are some of the common heat treatment methods employed to enhance the bars' performance in specific applications.
Machining of these bars is generally carried out using standard methods for austenitic stainless steels. However, it is essential to consider the high strength and hardness of these alloys, which may require suitable tooling and machining parameters to achieve optimal results.
ASTM A276, ASTM A479, AMS 5513, AMS 5511, AMS 5647
EN, DIN, JIS, ASTM, BS, ASME, AISI
3 ~ 800mm
H8, H9, H10, H11, H12, H13K9, K10, K11, K12 or as per clients requirements
Hex Bar Size:- 2-100mm A/F
Flat Bar Size:- Thickness: 2 -100mm, Width: 10 to 500mm.
Square Bar Size:- 4 to 100mm
Rectangular Bar Size:- 33 x 30mm to 295 x 1066mm, Thickness: 3.0 to 12.0mm.
Hollow Bar Size:- 32mm OD x 16mm ID to 250mm OD x 200mm ID)
Cold (bright) drawn, centreless ground, hot rolled, smooth turned, peeled, slit rolled edge, hot rolled annealed, Rough Turned, Bright, Polish, Grinding, Centreless Ground & Black
Bright, Hot Rolled Pickled, Cold Drawn, Sand Blasting Finished, Polished, Hairline
Round, Rod, T-Bar, Channel Bar, Precision Ground Bar, Flat Bar, Square, Blocks, Round Rod, Half Round Bar, Forged Hex bars, Forged Square Bars etc.
| STANDARD | UNS | WNR. | EN | JIS | GOST |
| SS 347 | S34700 | 1.4550 | X6CrNiNb18-10 | SUS 347 | 08Ch18N12B |
| SS 347H | S34709 | 1.4961 | X6CrNiNb18-12 | SUS 347H | - |
| Element | C | Cr | Mn | Ni | P | S | Si | Cb/Ta |
| 347 | 0.08 max |
min: 17.0 max: 20.0 |
2.0 max |
min: 9.0 max: 13.0 |
0.04 max |
0.30 max |
0.75 max |
min:10x C max: 1.0 |
| 347H |
min: 0.04 max: 0.10 |
min: 17.0 max: 20.0 |
2.0 max | min: 9.0 max: 13.0 |
0.03 max | 0.30 max |
0.75 max |
min:10x C max: 1.0 |
| Grade | Tensile Strength ksi (MPa) min | Yield Strength 0.2% ksi offset ksi (MPa) min | Elongation (% in 50mm) min | Hardness (Brinell) MAX | Hardness (Rockwell B) MAX |
| 347/347H |
75 (515) |
30 (205) |
40 | 201 | 95 |
Oil & Gas Industrires
Chemical Industries
Construction Industries
Offshore Pipelines & Pipe Works
Petrochemical Industry
Shipbuilding Industries
Hydraulic Applications
Piping Systems
Refining Industry
Food Processing Industry
Pulp & Paper Industry
Power Plant Industry
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