Metinox Overseas offers Welded Pipes made of Stainless Steel 304H, preferred in hostile environments where there are high-temperature and pressure industrial uses. We are also the most relied manufacturer and distributor of SS304H welded pipes that is very popular in the market as it has a high heat resistance at a low cost. Stainless Steel 304H 304H is a higher carbon austenitic steel that is chromium-nickel. This is useful in high temperatures where strength is enhanced by creep. The petroleum industry, petrochemicals, power plants, chemical processing, boilers, and heat exchangers use such SS 304H welded pipes. These characteristics of heat resistance and high size allow the use of SS 304H welded pipes in structural pipe work, as well as industrial facilities.
Produced using high-quality stainless steel plates, coils, and strips, the 304H welded pipes are rolled into cylinders and then welded using advanced methods with or without the filler material. An added advantage of the Stainless Steel 304H welded pipes lies in the high oxidation resistance and creep strength displayed at high temperatures, coupled with the availability of a more economical alternative to seamless pipes. Though the strength displayed by the weld area might be less when compared to other variants, SS 304H welded pipes prove to be a strong performer and a reliable choice when exposed to the most demanding industrial and thermal conditions.
| Specification Parameter | Technical Details & Range |
| Industry Standards | ASTM A312 / ASME SA312 |
| Welded Pipe Size | 1/2" NB to 24" NB (Standard Stock available) |
| Outside Diameter (OD) | 6.00 mm to 914.4 mm (Custom sizes available) |
| Thickness Range | 0.3 mm � 50 mm |
| Schedules | SCH 5, 10, 40, 80, 80S, 160, XXS, XS |
| Type | Welded (ERW, EFW, or Plasma Arc Welded) |
| Form | Round, Square, and Rectangular Pipes |
| Length | Single Random, Double Random & Required Cut Length |
| Pipe Ends | Plain End, Beveled End, Threaded |
| Outside Finish | 2B, No.1, No.4, No.8 Mirror Finish; Custom Polishing |
| Delivery Condition | Annealed & Pickled, Polished, Bright Annealed, Cold Drawn |
| EN 10216-5 (Ref) | EN 10216-5 1.4948 Welded Steel Pipes for pressure purposes |
| EN 10217-7 (Welded) | EN 10217-7 1.4948 Welded Pipes for pressure purposes |
| Grade | C (%) | Mn (%) | Si (%) | P (%) | S (%) | Cr (%) | Mo (%) | Ni (%) | N (%) |
| SS 304H | 0.04 - 0.10 | 2.0 max | 0.75 max | 0.045 max | 0.03 max | 18.0 - 20.0 | � | 8.0 - 10.5 | � |
| Grade | Tensile Strength (min) | Yield Strength (0.2% Proof) (min) | Elongation (min) | Hardness (HR B) max | Hardness (HB) max |
| SS 304H | 515 MPa | 205 MPa | 40% | 92 | 201 |
| NPS (Inches) | OD (Inches) | OD (mm) | Sch 5S (in/mm) | Sch 10S (in/mm) | Sch 40S (in/mm) | Sch 80S (in/mm) |
| 1/8 | 0.405 | 10.29 | 0.049 / 1.24 | 0.068 / 1.73 | 0.095 / 2.41 | � |
| 1/4 | 0.540 | 13.72 | 0.065 / 1.65 | 0.088 / 2.24 | 0.119 / 3.02 | � |
| 3/8 | 0.675 | 17.15 | 0.065 / 1.65 | 0.091 / 2.31 | 0.126 / 3.20 | � |
| 1/2 | 0.840 | 21.34 | 0.065 / 1.65 | 0.083 / 2.11 | 0.109 / 2.77 | 0.147 / 3.73 |
| 3/4 | 1.050 | 26.67 | 0.065 / 1.65 | 0.083 / 2.11 | 0.113 / 2.87 | 0.154 / 3.91 |
| 1 | 1.315 | 33.40 | 0.065 / 1.65 | 0.109 / 2.77 | 0.133 / 3.38 | 0.179 / 4.55 |
| 1 1/4 | 1.660 | 42.16 | 0.065 / 1.65 | 0.109 / 2.77 | 0.140 / 3.56 | 0.191 / 4.85 |
| 1 1/2 | 1.900 | 48.26 | 0.065 / 1.65 | 0.109 / 2.77 | 0.145 / 3.68 | 0.200 / 5.08 |
| 2 | 2.375 | 60.33 | 0.065 / 1.65 | 0.109 / 2.77 | 0.154 / 3.91 | 0.218 / 5.54 |
| 2 1/2 | 2.875 | 73.03 | 0.083 / 2.11 | 0.120 / 3.05 | 0.203 / 5.16 | 0.276 / 7.01 |
| 3 | 3.500 | 88.90 | 0.083 / 2.11 | 0.120 / 3.05 | 0.216 / 5.49 | 0.300 / 7.62 |
| 3 1/2 | 4.000 | 101.60 | 0.083 / 2.11 | 0.120 / 3.05 | 0.226 / 5.74 | 0.318 / 8.08 |
| 4 | 4.500 | 114.30 | 0.083 / 2.11 | 0.120 / 3.05 | 0.237 / 6.02 | 0.337 / 8.56 |
| 5 | 5.563 | 141.30 | 0.109 / 2.77 | 0.134 / 3.40 | 0.258 / 6.55 | 0.375 / 9.52 |
| 6 | 6.625 | 168.28 | 0.109 / 2.77 | 0.134 / 3.40 | 0.280 / 7.11 | 0.432 / 10.97 |
| 8 | 8.625 | 219.08 | 0.109 / 2.77 | 0.148 / 3.76 | 0.322 / 8.18 | 0.500 / 12.70 |
| 10 | 10.750 | 273.05 | 0.134 / 3.40 | 0.165 / 4.19 | 0.365 / 9.27 | 0.500 / 12.70 |
| 12 | 12.750 | 323.85 | 0.156 / 3.96 | 0.180 / 4.57 | 0.375 / 9.52 | 0.500 / 12.70 |
| 14 | 14.000 | 355.60 | 0.156 / 3.96 | 0.188 / 4.78 | � | � |
| 16 | 16.000 | 406.40 | 0.165 / 4.19 | 0.188 / 4.78 | � | � |
| 20 | 20.000 | 508.00 | 0.188 / 4.78 | 0.188 / 4.78 | � | � |
| 24 | 24.000 | 609.60 | 0.218 / 5.54 | 0.250 / 6.35 | � | � |
| Category | Standard / Reference | Details |
| Common Name | Stainless Steel 304H | High Carbon 18-8 Stainless Steel |
| Werkstoff Nr. | 1.4948 | German/European numeric designation |
| UNS Number | S30409 | Unified Numbering System (USA) |
| AISI / SAE | 304H | American Iron and Steel Institute |
| EN Name | X6CrNi18-11 | European symbolic designation |
| JIS Grade | SUS 304H | Japanese Industrial Standard |
| AFNOR | Z6CN18-10 | French Standard |
| GOST | 08Kh18N10 | Russian Standard |
| NPS (Nominal Pipe Size) | Over (+) Inches | Over (+) mm | Under (-) Inches | Under (-) mm |
| 1/8" � 1 1/2" | 1/64" (0.015) | 0.4 | 1/32" (0.031) | 0.8 |
| > 1 1/2" � 4" | 1/32" (0.031) | 0.8 | 1/32" (0.031) | 0.8 |
| > 4" � 8" | 1/16" (0.062) | 1.6 | 1/32" (0.031) | 0.8 |
| > 8" � 18" | 3/32" (0.093) | 2.4 | 1/32" (0.031) | 0.8 |
| > 18" � 26" | 1/8" (0.125) | 3.2 | 1/32" (0.031) | 0.8 |
| > 26" � 34" | 5/32" (0.156) | 4.0 | 1/32" (0.031) | 0.8 |
| > 34" � 48" | 3/16" (0.187) | 4.8 | 1/32" (0.031) | 0.8 |
SS 304H Welded pipes are produced by a high technology process to assure structural integrity, high accuracy in dimensions, and evenness of welded metallurgical properties.
Welded SS 304H Pipes offer a number of technical and economic benefits over seamless pipes.
Welded pipes are cheaper to produce and thus more economical when the diameter of the pipe is large or longer in length.
The welded pipes can be made with a greater diameter and length than those made of seamless pipes.
Manufacturing is controlled to maintain uniform thickness in all parts of the length of the pipe.
The reduced lead time and enhanced project planning are due to faster production cycles.
Welded pipes also generally have cleaner inside and outside flows, and this contributes to better flow.
The use of modern technology in welding guarantees high strength and reliability at high temperatures.
SS 304H welded pipes find a lot of application in the industries that demand heat resistance, strength, and durable pipes.
Applied in boilers, heat exchangers, and furnace tubing.
Usually used in thermal power plants, steam piping systems, and pressure vessels.
Applied in refineries and petrochemical plants to transport fluids under high temperatures.
Appropriate in chemical reactors, process piping and heat-handling systems.
Applied in piping networks of large diameter where durability and low costs are needed.
Used in construction structures and machinery used in industries that have high temperatures.
Choose Metinox Overseas � Your Reliable SS 304H Welded Pipe Manufacturer, Supplier & Exporter.
Let us support your high-temperature projects with quality, precision, and performance.
The Stainless Steel 304H welded pipes are high-carbon austenitic stainless steel pipes made by welding, designed for strength and performance at high temperatures.
Yes, SS 304H welded pipes are often solution annealed or heat-treated to improve strength and performance.
SS 304H pipes can easily work in high temperatures up to approximately 870�C.
The density of Stainless Steel 304H seamless pipe is about 8.0 g/cm�.
Yes, 304H welded pipes are widely used in power plants due to their excellent high-temperature strength and durability.
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