N08904  is ultra-low carbon high Ni-Mo-Cu super austenitic stainless steel bright bar.
High molybdenum forms dense passivation film, copper enhances resistance to reducing acids, and high nickel restrains chloride stress corrosion cracking. Ultra-low carbon eliminates chromium carbide precipitation between 425~850℃, no intergranular corrosion sensitization after welding, post-weld solution annealing is unnecessary for thick weldments.
Trace nitrogen solid-solution strengthening doubles yield strength vs 304, with outstanding plasticity, deep drawability and cold heading performance, uniform plastic deformation without brittle fracture risk. It cannot be hardened by heat treatment; cold working induces work hardening, while high toughness can be restored via solution rapid cooling at 1030~1100℃, fully non-magnetic after solution annealing with single-phase austenite matrix.

Chemical element content (%)

Specification：1.00~300.00mm

Application: It is mainly used to manufacture dilute sulfuric acid reactor shafts, pulp bleaching valve spools, FGD heat exchanger mandrels for power plants, hydrometallurgy extraction pump shafts, medium-corrosion seawater desalination pipe flanges, connectors for phosphoric & acetic acid equipment, waste incineration desulfurization fasteners, high-salt wastewater treatment valve bodies, heavy-corrosion mandrels for pharmaceutical pipelines, stainless steel bolts for pickling equipment, etc.
Widely applied in sulfuric & phosphoric chemical units, paper bleaching production lines, power plant flue gas desulfurization systems, hydrometallurgy, seawater desalination supporting facilities, fine organic acid chemical lines, high-salt wastewater environmental equipment, complete pharmaceutical anti-corrosion plants and coastal medium-corrosion heat exchange devices.

Core Advantages Over Competitors

1. High quality stability: Full closed-loop production and online spectral non-destructive inspection strictly control key alloy elements C, Cr, Ni, Mo, Cu, N with carbon stably limited ≤0.02% and qualified Mo-Cu-Ni ratio. Uniform segregation-free austenitic microstructure ensures negligible batch fluctuation of sulfuric acid resistance, pitting resistance and weldability for consistent mass production of chemical and desulfurization corrosion parts.

2. Excellent surface quality: Dedicated high-precision cold drawing and centerless grinding lines produce bars free of scale, scratches and pits with mirror finish. Smooth surface reduces chloride & acid-induced surface stress concentration to greatly extend fatigue life of parts under pickling, desulfurization and seawater service; secondary polishing is unnecessary for most precision machining.

3. Ultra-high dimensional accuracy: Precision cold rolling mills and automatic online dimension detectors narrow tolerance range with tiny single-bar error and strong batch uniformity. Unified part specifications during automatic mass production significantly raise finished yield and machining precision.

4. Rich product variety: According to market demand and customer's special requirements, customized products are provided to meet the use requirements under various complex working conditions, providing customers with more choices.

5. Perfect after-sales service: The perfect after-sales service system can respond to customer needs and feedback in a timely manner. For problems encountered by customers during use, technical support and solutions are provided to customers quickly.

We mainly engage in cold heading wire, bar, peeled bar, and profiled bar; our products cover 11 series and more than 300 grades, and we continue to develop a variety of professional steels. We can provide all-round solutions such as cold heading finishing line manufacturing and high-precision bright bar customization, and provide one-stop procurement services and package procurement solutions for global customers. The website displays some grades. If you don’t have the grade you need, please contact us by phone or email.