Stainless Steel 904L Welded Tubes
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Midland Alloys Inc. is a leading manufacturer of welded tubes made with very precise measurements. We are a top exporter and supplier of 904L welded tubes and we focus on making high performance products that can handle the toughest conditions. Our knowledge of stainless steel makes sure that every tube we make meets the high standards of today’s industry.
Stainless steel 904L welded tubes are made from a high-alloy austenitic grade. We design these tubes specifically for aggressive and corrosive settings where standard steel fails. This grade is a low carbon alloy that includes molybdenum and copper. These additions provide a massive boost in resisting corrosion compared to common grades.
These tubes offer excellent protection against pitting, crevice corrosion, and stress corrosion cracking. We ensure full compliance with international standards, including ASTM A312, ASTM A358, ASME SA312, and EN specifications.
We use cutting edge technology to make tubes out of high-quality stainless steel coils or plates in our factory. We have a lot of different sizes, wall thicknesses and surface finishes to fit your needs. We have ISO certification and are a global exporter, so we constantly have stock on hand for quick delivery around the world. We are a trusted supplier of ss 904L welded tubes and we make quality our top priority in every shipment.
What is SS 904L Welded Tube?
An SS 904L welded tube is basically a flat stainless steel sheet or plate initially. We employ extremely precise equipment to roll this metal into a round shape. After the edges come together we perform longitudinal welding to fuse them. Thus a sturdy uninterrupted tube is formed with the seam running down the length of it. Usually we apply TIG or automatic welding methods to guarantee that the joint is equally strong as the metal.
After the welding is complete, the tubes undergo heat treatment and specialized finishing. This step ensures the weld seam is uniform and the metal reaches its full strength. 904L is a low-carbon alloy, so it stops carbide from building up during welding’s high heat. This keeps the tube from rusting at the seam and makes it stronger. The high levels of nickel and molybdenum in the stainless steel 904L welded tube make it a top choice for handling harsh acids and salty marine environments where other steels might fail.
Benefits of SS 904L Welded Tubing
Choosing 904L welded tubing provides clear advantages in chemical processing and high-moisture areas. These tubes are built to last longer and perform better under stress.
- Excellent Resistance to Pitting and Crevice Corrosion: When there is a lot of salt or chloride in the air, tiny holes called pits can form in metal. 904L has a lot of chromium and molybdenum in it to stop this from developing which keeps the surface smooth and solid.
- Superior Resistance to Sulfuric and Phosphoric Acids: This alloy has more copper in it. This particular addition lets the tube handle very strong acids that would normally rust lower grades of steel.
- High Resistance to Stress Corrosion Cracking: Many metals crack when they are under physical tension in a hot or corrosive setting. The high nickel content in 904L helps the tube stay structurally sound without cracking under pressure.
- Low Carbon Content Improves Weldability: We use a low-carbon version of this alloy to prevent “carbide precipitation.” This means the area around the weld stays just as strong and rust-resistant as the rest of the tube.
- Good Oxidation Resistance: These tubes can handle high temperatures without reacting with oxygen. This prevents the metal from scaling or weakening when the heat turns up.
- High Durability in Marine Environments: Saltwater is incredibly harsh on most metals. 904L is a top choice for offshore work because it resists the constant attack of sea spray and submerged conditions.
- Smooth Internal Surface for Efficient Flow: Our manufacturing process ensures the inside of the tube is clear and even. This helps fluids move quickly without getting stuck or causing buildup along the weld seam.
Specification of Stainless Steel 904L Welded Tubes
We follow strict rules to make sure that every tube meets the needs of the industry. We use the following standard specifications to make sure our tubes are safe and of high quality.
Tube OD : 1 / 2" NB - 16" NB
ASTM B673 / ASTM SB673
Welded
Round, Square, Rectangular, Hydraulic Etc
Single Random, Double Random, Standard & Cut length
Plain Ends (PE), Threaded Ends (TE), Bevelled Ends (BW), Grooved Mechanical Joints or Grooved Ends, TBE (Treaded Both Ends)
SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS
2B, No.4, No.1, No.8 Mirror Finish for Stainless Steel Tubes, Finish as per customer Requirements
Types of SS 904L Welded Tubes
We produce these tubes using longitudinal welding to ensure structural reliability. They come in various shapes and finishes for different industrial jobs.
Tube Forms
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Round TubeThis is the most common shape, primarily used for process piping and transporting fluids in chemical plants.
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Square TubeThese tubes provide excellent strength-to-weight ratios for structural frames and custom fabrication projects.
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Rectangular tubesEngineers often choose this shape for heavy support structures and construction in corrosive environments.
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Polished TubeThese undergo extra surface treatment for a shiny look, making them ideal for architectural and decorative designs.
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Process TubeWe build these specifically to handle the high-heat and high-pressure demands of petrochemical systems.
Contact us today to discuss how Stainless Steel 904L Welded Tubes can benefit your application. Whether you need guidance in selecting the right Tubes or have specific requirements, our team of experts is here to help you find the optimal solution.
Technical Details & Delivery Condition
The secret to the strength of 904L lies in its chemical makeup. By balancing copper and nickel with other elements, we create a tube that resists rust better than almost any other grade.
| Element | Min | Max |
| C | – | 0.2 |
| Mn | – | 2 |
| Ni | 23 | 28 |
| Cr | 19 | 23 |
| S | – | 0.3 |
| Mo | 4 | 5 |
| N | – | 0.1 |
| Cu | 1 | 2 |
| P | – | 0.03 |
| Si | – | 0.7 |
Our tubes are not just rust resistant it is also physically strong. It can handle high pressure and physical impact without breaking or deforming.
| Temper | Annealed | |
| Elongation (2” or 4D gl) | 35 | % (min) |
| Tensile Rm | 490 | MPa (min) |
| Tensile Rm | 71 | ksi (min) |
| R.p. 0.2% Yield | 220 | MPa (min) |
| R.p. 0.2% Yield | 32 | ksi (min) |
Stainless Steel Seamless Tubes Grades We Offer
Round Bar
Analytic
Cut to Length
Centering
Heating
Perforation
Inspection of Size
Pickling
Inspection of Surface
Lubricating
Cold Drawing (Cold Rolling)
Degreasing
Annealing
Straightening
Cut
Pickling / Passivating
Inspection
Analytic
Marking
Packing & Shipping
Industrial Applications for SS 904L Welded Tubes
These tubes are essential in many heavy industries. In the oil and gas sector, they handle raw materials that would corrode other metals. Petrochemical and chemical plants use them to move hazardous acids safely. They are also common in power generation and marine industries where salt air is a constant threat.
Because they handle high pressure so well, you will find them in process piping and acid handling systems. They are the top choice for seawater cooling systems and heat exchanger tubing. These tubes are an affordable and long-lasting way to deal with any harsh environment, whether they are used in structural frameworks or complicated piping.
Why Choose 904L SS Welded Tubes
904L SS welded tubes are widely used in very harsh conditions. Most standard steels, like 304 or 316, can’t stand high levels of salt or strong acids for very long. Later, those grades may develop pits or cracks that need costly repairs. 904L is a high-alloy metal that stays strong even in chloride-rich environments and offshore settings. This makes it a top choice for the marine and chemical industries where safety and durability come first.
The main reason to pick this grade is its long service life. Because it resists corrosion so well, you won’t have to replace your piping as often. This decreases your long-term maintenance costs and keeps your plant running without any unexpected shutdowns. As a reliable supplier of stainless steel 904L welded tubes, we only offer tubes that meet international quality standards. Our ISO-certified production means you get a reliable and lasts longer than almost any other material on the market when it comes to handling aggressive media.
FAQs – Stainless Steel 904L Tubes
They follow the ASTM A312 or A358 standards which set out the sizes, welding methods and testing requirements for stainless steel.
Yes. The added copper and high nickel content make it specifically resistant to strong acids like sulfuric acid.
Absolutely. It is much more resistant to salt water and chloride pitting than standard 316 stainless steel.
