SS 904L Welded Pipes Manufacturer
- Home
- Steel Pipes
- Stainless Steel 904L Welded Pipes
Midland Alloys Inc. is a trusted manufacturer and supplier of SS 904L welded pipes, providing high-performance solutions for industries where standard stainless grades simply fail. As a leading SS 904L welded pipe manufacturer, we specialise in producing high-alloy austenitic pipes with a low carbon footprint, specifically engineered to withstand aggressive chemical environments. These pipes are manufactured using a chemical composition consisting of nickel, chromium, molybdenum, and copper, which provides them with outstanding resistance to phosphoric and sulphuric acids. Our products comply with ASTM, ASME, or EN standards, which provide a wide range of wall thicknesses and surface treatments to meet the exact specifications. We maintain a large supply of stainless steel 904L welded pipe ready for immediate delivery. Our ISO-certified procedures ensure that each 904L stainless steel welded pipe provides complete traceability for global export. We ensure that our 904L welded pipe can withstand the most harsh chloride-rich conditions.
What is SS 904L Welded Pipe?
An SS 904L welded pipe is a high-performance conduit made by cold-forming stainless steel strips or plates into a cylindrical shape and then joining the seam with precise welding procedures. Unlike standard grades, this is a super-austenitic alloy designed specifically for applications where pitting and stress corrosion cracking are common hazards. These pipes often adhere to manufacturing standards such as ASTM A312 or A358, ensuring that they can withstand the mechanical demands of industrial process systems. The 904L stainless steel welded pipe is significantly more stable as a result of the copper addition to its key material. This enables it to withstand significant amounts of sulphuric acid. In order to prevent sensitisation during the welding process, we prioritise minimal carbon content when fabricating 904L welded process pipes. This results in an extremely durable final product that is suitable for use in the chemical industry and on oil rigs, as it is a reliable and strong option for the transportation of heavy-duty fluids.
Benefits of Welded SS 904L Piping
Choosing the right material saves a lot of money on maintenance and replacement costs over the long term. These pipes offer a unique combination of fabricability and extreme chemical stability.
- 904L welded pipe benefits include high nickel and molybdenum for resisting crevice corrosion.
- The added copper content provides a rare defence against varying concentrations of sulphuric acid.
- Low carbon levels ensure the pipe remains resistant to intergranular corrosion after welding.
- 904L corrosion-resistant pipe performs exceptionally well in salty marine and brackish water.
- The material exhibits strong mechanical properties, staying stable even under high-pressure loads.
- Excellent weldability allows for easy on-site fabrication without the risk of cracking.
- SS 904L welded pipe advantages include a long service life in harsh pharmaceutical processing.
- Resistance to stress corrosion cracking is significantly higher than that of 300-series stainless steels.
Specification of Stainless 904L Welded Pipes
The table below summarises the standard manufacturing specifications used for stainless steel 904L welded pipes, including dimensions, tolerances, and applicable international standards for industrial service.
Seamless Pipe OD : 1/8 -12" NPS
ASTM /ASME SA312/A312
Welded
Round, Square, Rectangular, Hydraulic Etc
Single Random, Double Random & Cut Length.
Plain End, Beveled End, Treaded
SCH5, SCH10, SCH20, SCH30, SCH40, STD, SCH80, SCH 80S, SCH60, SCH80, SCH120, SCH140, SCH160, SCH XXS, SCH XS
No. 2B - Mill finish/ Matte finish, No.8 - Mirror finish, No. 4 - Brushed finish, Bright, Annealing, Polished, Mirror
Types of SS 904L Welded Pipes
We manufacture these pipes in several geometries because industrial layouts are rarely just straight lines. Our range supports everything from heavy industrial refineries to sleek architectural supports.
Pipe Forms
-
Round PipeThe standard choice for moving fluids and gases in chemical process systems.
-
Square PipeIdeal for structural frameworks in offshore environments where corrosion is a factor.
-
Rectangular PipeOften used in construction and support structures that require high alloy strength.
-
Polished PipeOffers a smooth, aesthetic finish for architectural or sanitary applications.
- Industrial Process Pipe
Heavy-duty piping designed specifically for refineries and acid-handling plants.
Contact us today to discuss how Stainless Steel 904L Welded Pipes can benefit your application. Whether you need guidance in selecting the right pipes or have specific requirements, our team of experts is here to help you find the optimal solution.
Technical Details & Delivery Condition
This table presents the controlled chemical composition of SS 904L welded pipes, highlighting the high nickel, chromium, molybdenum, and copper content responsible for superior corrosion resistance.
| Element | C | Mn | Ni | Cr | S | Mo | N | Cu | P | Si |
| Min | – | – | 23 | 19 | – | 4 | – | 1 | – | – |
| Max | 0.2 | 2 | 28 | 23 | 0.3 | 5 | 0.1 | 2 | 0.03 | 0.7 |
| Property | Tensile Rm | R.p. 0.2% Yield | Elongation (2” or 4D gl) |
| Value | 71 ksi / 490 MPa (min) | 32 ksi / 220 MPa (min) | 35% (min) |
| Unit | ksi / MPa | ksi / MPa | % |
Stainless Steel Welded Pipe Grades We Also Offer
How SS 904L Seamless Pipes Are Manufactured
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 Pipes
The versatility of this alloy finds its way into the most demanding sectors, including oil and gas, petrochemical, and power generation. In chemical processing, these pipes handle everything from acetic to phosphoric acids without flinching. Marine and offshore industries rely on them for seawater cooling systems because the chloride levels there would eat through lesser steels in months. We also supply these to pulp and paper bleaching plants and pharmaceutical laboratories where cleanliness and corrosion resistance are essential. Welded construction is a more cost-effective alternative to seamless pipes while maintaining the structural strength required for heat exchangers and acid handling equipment. It is the base of the current aggressive-environment infrastructure.
Why Choose SS 904L Welded Pipes?
SS 904L welded pipes are used in systems exposed to strong acids, chlorides, and unstable chemical conditions, where standard grades fail prematurely. The alloy’s high nickel and molybdenum levels enhance resistance to pitting, crevice corrosion, and stress corrosion cracking, while copper improves performance in sulphuric acid service. Welded construction provides for precise dimensions and constant wall thickness while maintaining corrosion resistance at the seam. Fabrication is reliable due to the low carbon concentration, which prevents weld-zone deterioration. Over extensive service cycles, these pipes maintain their strength and integrity with minimal maintenance. As an ISO-certified company, we supply export quality 904L pipes that meet global compliance needs. Midland Alloys Inc. operates as a dependable stainless steel 904L welded pipe supplier for critical applications.
Why Choose SS 904L Welded Pipes?
904L has significantly higher nickel and molybdenum content than 316L, plus added copper. This makes 904L far more resistant to strong acids and chloride pitting, where 316L might fail.
Yes. SS 904L pipes are engineered to withstand crevice corrosion and pitting in chloride-rich environments, such as seawater, which makes them perfect for offshore applications.
Yes. They are the preferred option for the transportation of dilute sulphuric acid and other aggressive chemicals in process piping.
We offer sizes ranging from 1/8″ NB to 24″ NB in various schedules, including SCH 10, 40, and 80.
