Metinox Overseas is a renowned manufacturer of Stainless Steel 347/347H EFW Pipe, manufacturer of columbium-stabilized alloys, which resist extreme temperatures and also corrosion resistance. We have designed our Stainless Steel 347 EFW Pipe to be alloyed with Columbium (Niobium) and Tantalum that offers resistance to intergranular corrosion when subjected to the range of carbide precipitation of 800-1500degF (427-816degC). Where the highest creep and stress rupture strength is needed as well as other applications that require effective thermal performance, we offer the SS 347H EFW Pipe that has a higher carbon content to achieve high thermal performance. These pipes are manufactured based on the ASTM A358 standards and are required in aircraft engine components, oil refinery devices and high pressure steam pipes. The stabilization of 347/347H is responsible for rendering it the stronger competitor of 321 EFW pipes that are used in the highly oxidizing environments. In the 2026, the application of 347H pipes in the green hydrogen and ammonia plants in the Middle East showed an increase of 4.8 percent. Metinox Overseas is making sure that every 347 series pipes are being heat-treated and subjected to the highest level of safety to our customers in the USA, Europe and South East Asia.
Table of Contents
- Stainless Steel 347/347H EFW Pipe Manufacturer and Supplier
- More About SS 347/347H EFW Pipes
- Testing of SS 347/347H EFW Pipes
- Stainless Steel 347/347H EFW Pipe Specification
- Stainless Steel UNS S34700/S34709 Electric Fusion Welded Pipes Equivalent Grades
- 347/347H Stainless Steel EFW Pipes Chemical Composition
- ASME SA312 SS TP347/TP347H EFW Pipes Mechanical Properties
- Other types of Stainless Steel 347/347H Electric Fusion Welded Pipes
More About SS 347/347H EFW Pipes
The EFW in the SS 347/347H EFW Pipes is shortened as Electric Fusion Welded type of pipes. The pipe division comprises of JCO forming press, spiral or helical mill, inside or outside welding system, heat treatment and testing division. There are various application industries in which it can be applied such as offshore industry, petrochemical industries, refining industries, gas industries, oil industries etc.
The SS 347/347H EWF Pipes comes in either type of martensitic, austenitic and ferritic depending on the structure of the product. This kind of pipes is easily shock-resistant, vibration resistant and high temperature. The intergranular corrosion is resisted by the addition of the niobium to this Stainless Steel 347/347H EFW pipes. It is also made out of high creep strength.
A majority of the parts being intermittently heated and cooled are made using the grade 347 to the temperature of between 800 deg F -1600 deg F.
Testing of the product
Once the manufacturing process of the product is completed, SS 347/347H EFW Pipes are tested a number of times in order to check and assure the quality of the end product. That is done to ensure long term relations with our clients which are structured according to the industry guidelines. The tests which the product undergoes are some of third party, chemical test, positive material test, mechanical test, flattening test, flaring test, hardness test, intergranular resistance test, etc.
Stainless Steel 347/347H EFW Pipe Specification
| Specifications | ASTM A312/ ASME SA312 |
| EFW Pipes | 6" NB - 24" NB |
| Outside Diameter | 6.00 mm OD up to 914.4 mm OD, Sizes up to 24" NB available Ex-stock, OD Size Steel Tubes available Ex-stock |
| Thickness Range | 0.3mm � 50 mm, SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS |
| Type | EFW |
| Form | Round Pipes, Square Pipes, Rectangular Pipes |
| Length | Single Random, Double Random & Required Length |
| End | Plain End, Beveled End, Treaded |
| Outside Finish | 2B, No.4, No.1, No.8 Mirror Finish for Stainless Steel Pipes, Finish as per customer Requirements |
| Delivery Condition | Annealed and Pickled, Polished, Bright Annealed, Cold Drawn |
| EN 10216-5 | EN 10216 347/347H EFW Steel Pipe, EN 10216-5 1.4550 EFW Steel Pipes for pressure purposes |
| EN 10217-7 | EN 10217 347/347H EFW Steel Pipe, Steel EN 10217-7 1.4961 EFW Pipes for pressure purposes |
Stainless Steel UNS S34700/S34709 Electric Fusion Welded 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 | - |
347/347H Stainless Steel EFW Pipes Chemical Composition
| Grade | C | Mn | Si | P | S | Cr | Cb | Ni | Fe |
| SS 347 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 - 20.00 | 10xC � 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 | 8xC � 1.10 | 9.0 -13.0 | 63.72 min |
ASME SA312 SS TP347/TP347H EFW Pipes Mechanical Properties
| Tensile Strength | Yield Strength (0.2%Offset) | Elongation | Hardness Rockwell B (HR B) max | Hardness Brinell (HB) max |
| Psi � 75000, MPa � 515 | Psi � 30000, MPa � 205 | 35 % | 92 | 201 |
Other types of Stainless Steel 347/347H Electric Fusion Welded Pipes
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