The SS 347 and 347H welded pipes from Metinox Overseas are niobium-stabilized austenitic pipes, highly valued for their resistance against intergranular corrosion and stability at higher temperatures. Metinox Overseas functions as a reliable supplier and exporter of SS 347 and 347H welded pipes, developed from superior quality materials and advanced welding techniques, conforming to ASTM A312 and ASME requirements. The addition of niobium serves to stabilize resistance at the weld region and also resists carbide precipitation, besides which the increased content of carbon in 347H enhances resistance at higher temperatures.
Our SS 347/347H welded pipes can be supplied in a range of sizes, thicknesses, schedules, and finishes to cater to different requirements. Our pipes are famous for their excellent weldability, resistance to oxidation, and durability characteristics. This makes them extensively used in heat exchanger applications, pressure vessel applications, petrochemical processes, power plants, refinery applications, aerospace applications, etc. Our pipes are tested for quality and can also provide test certificates along with chemical and mechanical properties, radiographic testing, and inspection certificates by third-party inspection agents. With secure packing arrangements and international shipping networks, we can deliver products to overseas buyers safely.
Table of Contents
- Specifications of Stainless Steel 347 / 347H Welded Pipe
- Chemical Composition of SS 347 / 347H Welded Pipes
- ASME SA312 SS TP347 Pipes / ASME SA312 SS TP347H Pipes Mechanical Properties
- Stainless Steel UNS S34700 Pipe / Stainless Steel UNS S34709 Pipes Equivalent Grades
- SS 347/347H Stainless Steel Pipe Price List
- AISI 347H Pipe Pressure Ratings
- Tolerance Level of Stainless Steel 347H Welded Tube
- Types of Stainless Steel 347 / 347H Welded Pipes
- Manufacturing Process of Stainless Steel 347 / 347H Welded Pipes
- Testing & Quality Certifications of Stainless Steel 347 / 347H Welded Pipes
- Applications & Industry Uses of Stainless Steel 347 / 347H Welded Pipes
- Frequently Asked Questions (FAQ)
Specifications of Stainless Steel 347 / 347H Welded Pipe
| Specifications | Details |
| Standard | ASTM A312 / ASME SA312 |
| Welded Pipes Size | 1/2? NB � 24? NB |
| Outside Diameter (OD) | 6.00 mm up to 914.4 mm (Sizes up to 24? NB available ex-stock) |
| Thickness Range | 0.3 mm � 50 mm (SCH 5, 10, 40, 80, 80S, 160, XXS, XS) |
| Type | Welded |
| Form | Round Pipes, Square Pipes, Rectangular Pipes |
| Length | Single Random, Double Random & Required Length |
| End Connection | Plain End, Beveled End, Threaded |
| Outside Finish | 2B, No.4, No.1, No.8 Mirror Finish, or as per customer requirements |
| Delivery Condition | Annealed and Pickled, Polished, Bright Annealed, Cold Drawn |
| EN 10216-5 Standard | Grade 347/347H (1.4550) Welded Steel Pipes for pressure purposes |
| EN 10217-7 Standard | Grade 347/347H (1.4961) Welded Pipes for pressure purposes |
Chemical Composition of SS 347 / 347H Welded Pipes
| Grade | C (%) | Mn (%) | Si (%) | P (%) | S (%) | Cr (%) | Cb (Nb) (%) | Ni (%) | Fe (%) |
| SS 347 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 � 20.00 | 10 �C � 1.10 | 9.00 � 13.00 | 62.74 min |
| SS 347H | 0.04 � 0.10 | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 � 19.00 | 8 �C � 1.10 | 9.0 � 13.0 | 63.72 min |
ASME SA312 SS TP347 Pipes / ASME SA312 SS TP347H Pipes Mechanical Properties
| Tensile Strength | Yield Strength (0.2% Offset) | Elongation | Hardness � Rockwell B (HR B) max | Hardness � Brinell (HB) max |
| 75,000 psi (515 MPa) | 30,000 psi (205 MPa) | 35% | 92 | 201 |
Stainless Steel UNS S34700 Pipe / Stainless Steel UNS S34709 Pipes Equivalent Grades
| STANDARD | UNS | WERKSTOFF NR. | EN | JIS | GOST |
| SS 347 | S34700 | 1.4550 | X6CrNiNb18-10 | SUS 347 | 08Ch18N12B |
| SS 347H | S34709 | 1.4961 | X6CrNiNb18-12 | SUS 347H | � |
SS 347/347H Stainless Steel Pipe Price List
| Item Description | Price in US ($) | Price in Indian (INR) |
| 347 Stainless Steel Pipe Price | 325 - 750 | 250 |
| 347H Stainless Steel Pipe Price | 650 - 825 | 200 |
| SS 347 Pipe Price | 450 - 650 | 210 |
| 347H SS Pipe Price List | 540 - 860 | 220 |
| 347 SS Pipe Price In Delhi | 370 - 740 | 215 |
| SS 347H Price List | 630 - 850 | 280 |
| SS 347 Pipe Price List | 800 - 860 | 200 |
AISI 347H Pipe Pressure Ratings
| Pipe Size (in) | Schedule | OD (in) | Wall Thickness (in) | 100�F | 200�F | 300�F | 400�F | 500�F | 600�F | 650�F | 700�F | 750�F |
| 1 | 40 | 1.315 | 0.133 | 2205 | 2205 | 2205 | 2047 | 1902 | 1783 | 1743 | 1703 | 1664 |
| 80 | 1.315 | 0.179 | 3061 | 3061 | 3061 | 2841 | 2640 | 2475 | 2420 | 2365 | 2310 | |
| 160 | 1.315 | 0.250 | 4493 | 4493 | 4493 | 4170 | 3874 | 3632 | 3552 | 3471 | 3390 | |
| 1 1/2 | 40 | 1.900 | 0.145 | 1629 | 1629 | 1629 | 1512 | 1404 | 1317 | 1287 | 1258 | 1229 |
| 80 | 1.900 | 0.200 | 2303 | 2303 | 2303 | 2138 | 1986 | 1862 | 1821 | 1779 | 1738 | |
| 160 | 1.900 | 0.281 | 3362 | 3362 | 3362 | 3120 | 2899 | 2717 | 2657 | 2597 | 2536 | |
| 2 | 40 | 2.375 | 0.154 | 1371 | 1371 | 1371 | 1272 | 1182 | 1108 | 1083 | 1059 | 1034 |
| 80 | 2.375 | 0.218 | 1985 | 1985 | 1985 | 1843 | 1712 | 1605 | 1569 | 1534 | 1498 | |
| 160 | 2.375 | 0.344 | 3283 | 3283 | 3283 | 3047 | 2831 | 2654 | 2595 | 2536 | 2477 | |
| 3 | 40 | 3.500 | 0.216 | 1301 | 1301 | 1301 | 1208 | 1122 | 1052 | 1028 | 1005 | 982 |
| 80 | 3.500 | 0.300 | 1844 | 1844 | 1844 | 1712 | 1590 | 1491 | 1458 | 1425 | 1391 | |
| 160 | 3.500 | 0.438 | 2787 | 2787 | 2787 | 2587 | 2403 | 2253 | 2203 | 2153 | 2103 | |
| 4 | 40 | 4.500 | 0.237 | 1102 | 1102 | 1102 | 1023 | 950 | 891 | 871 | 851 | 831 |
| 80 | 4.500 | 0.337 | 1596 | 1596 | 1596 | 1482 | 1377 | 1291 | 1262 | 1233 | 1204 | |
| 160 | 4.500 | 0.531 | 2611 | 2611 | 2611 | 2424 | 2255 | 2111 | 2064 | 2017 | 1970 | |
| 5 | 40 | 5.563 | 0.258 | 965 | 965 | 965 | 896 | 832 | 780 | 763 | 746 | 728 |
| 80 | 5.563 | 0.375 | 1428 | 1428 | 1428 | 1325 | 1231 | 1154 | 1129 | 1103 | 1077 | |
| 160 | 5.563 | 0.625 | 2474 | 2474 | 2474 | 2296 | 2133 | 2000 | 1955 | 1911 | 1866 | |
| 6 | 40 | 6.625 | 0.280 | 877 | 877 | 877 | 814 | 756 | 709 | 693 | 677 | 661 |
| 80 | 6.625 | 0.432 | 1379 | 1379 | 1379 | 1280 | 1189 | 1115 | 1090 | 1065 | 1040 | |
| 160 | 6.625 | 0.719 | 2382 | 2382 | 2382 | 2211 | 2054 | 1925 | 1883 | 1840 | 1797 | |
| 8 | 40 | 8.625 | 0.322 | 771 | 771 | 771 | 716 | 665 | 623 | 610 | 596 | 582 |
| 80 | 8.625 | 0.500 | 1218 | 1218 | 1218 | 1131 | 1050 | 985 | 963 | 941 | 919 | |
| 160 | 8.625 | 0.906 | 2298 | 2298 | 2298 | 2133 | 1982 | 1858 | 1817 | 1775 | 1734 | |
| 10 | 40 | 10.750 | 0.365 | 699 | 699 | 699 | 649 | 603 | 565 | 553 | 540 | 528 |
| 80 | 10.750 | 0.594 | 1159 | 1159 | 1159 | 1075 | 999 | 937 | 916 | 895 | 874 | |
| 160 | 10.750 | 1.125 | 2289 | 2289 | 2289 | 2124 | 1974 | 1850 | 1809 | 1768 | 1727 |
Tolerance Level of Stainless Steel 347H Welded Tube
| Nominal Pipe Size Designator | Over (Inches) | Under (Inches) |
| 1/8 to 1-1/2, incl | 1/64 (0.015) | 1/32 (0.031) |
| Over 1-1/2 to 4, incl | 1/32 (0.031) | 1/32 (0.031) |
| Over 4 to 8, incl | 1/16 (0.062) | 1/32 (0.031) |
| Over 8 to 18, incl | 3/32 (0.093) | 1/32 (0.031) |
Types of Stainless Steel 347 / 347H Welded Pipes
ERW Welded Pipes
EFW Welded Pipes
Manufacturing Process of Stainless Steel 347 / 347H Welded Pipes
Raw Material Selection: The stainless steel coils or plates of grade 347 and 347H are chosen according to their chemical and mechanical characteristics. The materials meet the relevant standards, so as to prohibit intergranular corrosion and resistance to high temperature.
Forming Process: The roller or forming machines are used to make the stainless steel strips take a cylindrical shape. Edge preparation is done properly, in order to provide proper alignment and quality welding.
Welding: The resulting edges are welded with hi-tech welding machines like the TIG or laser welding machines. The result of such a process is a strong, uniform weld seam with minimum defects that provide structural integrity and long service life.
Heat Treatment: The pipes are welded and then subjected to solution annealing or appropriate heat treatment to eliminate internal stresses and increase their resistance to corrosion. This action also enhances the welding metallography of the welding region.
Finishing and Testing: The pipes are straightened, cut to the necessary sizes, and dimensional checks as well as surface checks are made. Non-destructive testing is conducted so as to offer consistency, reliability, adherence, and quality.
Testing & Quality Certifications of Stainless Steel 347 / 347H Welded Pipes
Stainless steel 347 / 347H passes through the series of tests and quality control measures that guarantee adherence to international standards and the ability to operate honestly in the conditions of intensive service. These operations assure mechanical integrity, resistance to corrosion and dimensional accuracy.
Mechanical and Chemical Testing: Tensile strength, yield strength, elongation and hardness are tested to ensure that the pipes perform well in a mechanical way. The chemical analysis is done to ascertain the right alloy composition, such as the stabilization of niobium, and in line with the required material specifications.
Non-Destructive Testing: Such non-destructive tests as ultrasonic testing, eddy current testing, radiographic inspection, and hydrostatic testing are conducted to find surface and internal flaws. These are techniques that made sure that the soundness of welds and the structural reliability of the product would not be harmed.
Dimensional and Visual Inspection: The tests of outer diameter, wall thickness, length, and straightness are performed by conducting strict dimensional control. The eye test is used to guarantee a smooth surface finish, even weld line and the absence of any observable flaws.
Quality Certifications: The stainless steel 347 / 347H welded pipes are produced and tested in accordance to the known standards like ASTM, ASME, EN, and ISO. To make sure that there is traceability, quality assurance and customer confidence, mill test certificates and third-party inspection reports are provided.
Applications & Industry Uses of Stainless Steel 347 / 347H Welded Pipes
Because of their excellent resistance to corrosion, oxidation and high temperature conditions, stainless steel 347 / 347H welded pipes have been extensively applied in applications that need such characteristics. They are stabilized with niobium and therefore can serve long under thermal stress.
High Temperatures and PressuresThe pipes are also popular in the heat exchangers, boilers, superheaters and pressure vessels where high temperatures and pressure require in high-quality mechanical stability and creep resistance.
Chemical and Petrochemical industries: Stainless steel 347 / 347H welded pipe is used in chemical processing facilities, refineries and petrochemical facilities because it is resistant to intergranular corrosion as well as aggressive chemical applications.
Power generation and energy: These pipes find application in steam lines, exhaust systems and high-temperature piping networks in power plants and offer good performance during continuous thermal cycling.
Industrial and Manufacturing Applications: Industrial furnaces, food processing equipment, and manufacturing systems also use the pipes in industries where the ease of operation is very essential because the pipes are strong, durable, and resistant to corrosion.
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Frequently Asked Questions (FAQ)
It is a stainless steel pipe made by welding, designed to resist corrosion and perform well at high temperatures.
The 347H has higher carbon content than 347, which gives it better strength at high temperatures.
Yes, both are well-suited for high-temperature and heat-resistant applications.
They are available in a wide range of diameters and wall thicknesses as per standard pipe schedules.
Yes, they can be used for pressure applications when manufactured according to applicable standards.
Other types of Stainless Steel Welded Pipe
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