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 municipal wastewater heat exchanger mandrels, pulp mild bleaching valve spools, low-chloride pump shafts for oil refining, fasteners for dilute organic acid chemical reactors, low-pressure seawater desalination pipe flanges, circulating cooling water system bolts, mild corrosion bars for hydrometallurgy, low-temperature desulfurization fittings for waste incineration, chloride wastewater treatment valve bodies, small pressure-bearing stainless steel standard parts, etc.
Widely applied in municipal wastewater treatment projects, paper mild bleaching lines, petrochemical low-chloride units, atmospheric fine chemical equipment, coastal low-pressure seawater cooling facilities, environmental reclaimed water reuse equipment, hydrometallurgy mild corrosion production lines, complete low-temperature flue gas desulfurization equipment and other industries.

Core Advantages Over Competitors

1. High quality stability: Full closed-loop production with dual online spectral & metallographic inspection strictly controls C, Cr, Ni, Mo, N, balancing ferrite-austenite ratio within 40~60%. Uniform dispersed Mo-N precipitates ensure negligible batch fluctuation of yield strength, SCC resistance and weldability for consistent mass production of wastewater & paper-making corrosion parts.

2. Excellent surface quality: Dedicated high-precision cold drawing & centerless grinding lines produce bars free of scale, scratches and pits with smooth uniform finish. Smooth surface lowers initiation risk of chloride pitting to extend fatigue life under circulating cooling and bleaching 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 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.