S32750 is high Cr-Mo-N super duplex stainless steel bright bar with balanced ferrite-austenite dual phase (40~60% each).
Triple passivation system of high Cr-Mo-N delivers superior resistance to pitting, crevice corrosion and chloride stress corrosion cracking, far exceeding S32205(2205), 316L and 904L. Nitrogen solid-solution hardening raises yield strength ≥550MPa, more than double of 316L, combining ferrite’s outstanding SCC resistance and austenite’s high toughness. Ultra-low carbon eliminates chromium depletion sensitization after welding, no post-weld annealing required for thin-wall parts.
Standard solution treatment: Rapid water quenching at 1020~1100℃ to stabilize balanced dual-phase ratio. It cannot be hardened by quenching; cold working induces work hardening, while re-solution annealing restores balanced duplex microstructure and high toughness.
Moderate thermoplasticity for forging & hot rolling within 920~1080℃ forming window, tight temperature control to avoid unbalanced single-phase structure. Supports cold forming including bending, cold heading and stamping, stable for mass CNC machining; higher hardness causes higher tool wear than standard duplex steel.
Core positioning: High-pressure components under severe corrosive environments such as high-concentration seawater, hot brine, pulp bleaching, FGD flue gas desulfurization, H₂S & chloride oil & gas media and hydrometallurgy. Its corrosion resistance sits between 2205 and S31254 super austenitic steel, with much lower cost than nickel alloys and titanium, premium anti-corrosion pressure material for marine, environmental and chemical industries.

Chemical element content (%)

Specification：1.00~300.00mm

Application:It is mainly used to manufacture high-pressure seawater valve stems for deep offshore platforms, high-temperature seawater desalination heat exchanger mandrels, pulp bleaching precision valve spools, high-chloride FGD pressure shafts for power plants, H₂S & high-chloride pump shafts for oil & gas extraction, heavy-corrosion fasteners for hydrometallurgy, high-temperature seawater pipe flanges for marine vessels, high-temperature desulfurization valve bodies for waste incineration, mandrels for high-salt high-pressure wastewater treatment equipment, seawater cooling system bolts for offshore wind power, etc.
Widely applied in deep-sea offshore oil & gas platforms, large-scale seawater desalination projects, complete paper bleaching production lines, power plant high-temperature flue gas desulfurization units, hydrometallurgy extraction equipment, ocean-going marine seawater systems, waste incineration waste heat boilers, offshore wind power seawater cooling facilities, high-pressure heavy-corrosion phosphorus chemical reaction equipment and other industries.

Core Advantages Over Competitors

1. High quality stability: Full closed-loop production with dual online spectral & metallographic inspection strictly control C, Cr, Ni, Mo, N with qualified Mo-N ratio. Stable 40~60% ferrite-austenite ratio without segregation ensures negligible batch fluctuation of PREN, yield strength, SCC resistance and weldability for consistent mass production of deep-sea, desulfurization and paper-making high-pressure severe corrosion parts.

2. Excellent surface quality: Dedicated high-precision cold drawing & centerless grinding lines produce bars free of scale, scratches and pits with mirror finish. Smooth surface reduces high-temperature chloride-induced surface stress concentration to greatly extend fatigue life under hot concentrated seawater and bleaching liquor cyclic 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.