Stainless Steel 904L (UNS N08904) is a non-stabilized low carbon high alloy austenitic stainless steel. The addition of copper to this grade gives it greatly improved resistance to strong reducing acids, particularly sulfuric acid. It is also highly resistant to chloride attack—both pitting/crevice corrosion and stress corrosion cracking.
While 316L is the industry standard for general corrosion, 904L offers Information Gain in extreme environments. With 25% Nickel and 4.5% Molybdenum, 904L outperforms 316L in warm seawater and specialized chemical processing where standard grades fail within months.
As established in 2003, Shaanxi Kerlimar Engineers Co., Ltd. brings 21 years of specialized expertise in manufacturing pipes that meet ASTM, ASME, EN, and JIS standards. Our 904L pipes are engineered for the zero-tolerance requirements of modern industry.
| Element | Carbon (C) | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) | Copper (Cu) |
|---|---|---|---|---|---|
| 904L Content (%) | 0.02 max | 19.0 - 23.0 | 23.0 - 28.0 | 4.0 - 5.0 | 1.0 - 2.0 |
Established in 2003, Shaanxi Kerlimar Engineers Co., Ltd. has long been engaged in international trade business, mainly a variety of pipes, carbon steel, alloy steel, stainless steel material, seamless pipe, straight seam welded pipe, spiral welded pipe and matching pipe fittings.
Manufacturing standards for ASTM, ASME, EN, JIS and so on, in line with international standards. We are providing good quality, price competition, timely delivery, and perfect service!
China's stainless steel industry has evolved into a fully integrated ecosystem. From raw material sourcing to advanced cold-rolling and seamless extrusion technology, we offer a cost-to-performance ratio that is unmatched globally. Our factories leverage economies of scale to provide premium 904L at competitive prices.
Following the vision of Mr. Ming SUN, our company focuses on high-tech integration. We don't just manufacture pipes; we innovate in material science. Our participation in the China-Finland High Technology Match Conference and the Dubai COP28 Conference underscores our commitment to "Green Manufacturing."
We solve the "Trust Gap" in global sourcing through rigorous quality control. Every batch of 904L pipe undergoes Ultrasonic Testing (UT), Eddy Current Testing (ET), and Hydrostatic testing to ensure compliance with the most stringent global engineering codes.
904L is the primary choice for phosphate, sulfuric, and acetic acid production. Its resistance to phosphoric acid at all concentrations and temperatures makes it vital for agricultural chemical plants.
Used in offshore scrubbers, heat exchangers, and subsea pipelines where seawater exposure and sour gas (H2S) environments demand superior pitting resistance.
As highlighted in our company strength, we are pioneering New Vertical Axis Wind Power Technology. Stainless 904L components are essential for salt-mist environments in offshore wind farms.
Specifically used in bleaching equipment where chloride-rich chemicals are present, ensuring a service life 3x longer than standard stainless steels.
The chairman of Shaanxi Kerlimar, Mr. Ming SUN, is a strong environmentalist. Under his leadership, we've launched clean energy R&D, focusing on vertical axis wind turbine design—authorized with over 40 patents.
In 2020, we won the National High-tech Enterprise certification. Our pipes support not just industrial flow, but the grand goal of controlling global temperature rise below 1.5°C through "Double Carbon" goals.
The Pitting Resistance Equivalent Number (PREN) for 904L typically ranges between 34-36. This indicates its superior ability to resist localized pitting in high-chloride environments compared to 316L (PREN ~24).
904L is a fully austenitic grade, which means it is non-magnetic in the annealed condition and remains non-magnetic even after cold working.
Yes, it has excellent weldability using standard methods. However, because it is a fully austenitic material, it is more sensitive to hot cracking than grades like 304 or 316. We recommend using matching filler materials (904L) or high-nickel alloys like Inconel 625.
The cost is driven by the high levels of Nickel (25%) and Molybdenum (4.5%), which are expensive alloying elements but necessary for its extreme corrosion resistance.
Kerlimar
