310S, also known as 2520 stainless steel bright bar, national standard grade 06Cr25Ni20, UNS S31008, EN 1.4845, is a high-chromium high-nickel low-carbon austenitic heat-resistant stainless steel. It contains 24%~26% chromium, 19%~22% nickel and carbon ≤0.08%. High chromium forms dense anti-oxidation film, high nickel stabilizes austenitic matrix, and low carbon restricts carbide precipitation during welding & high-temperature service to avoid intergranular corrosion sensitization.
It delivers balanced room-temperature mechanical properties with sufficient tensile & yield strength, outstanding plasticity, deep drawability and cold heading performance. Uniform plastic deformation occurs under load without brittle fracture risk. It cannot be hardened by heat treatment; cold working causes work hardening, while solution annealing restores high toughness.
It boasts excellent thermoplasticity for smooth high-temperature forging and hot rolling, and supports cold forming including bending, stamping and cold heading, with stable machinability for turning, milling, drilling and CNC processing.
Its core strengths lie in ultra-high-temperature oxidation resistance and superior high-temperature creep strength. It can operate continuously at 1000~1100℃ under oxidizing atmosphere, and withstand short-term peak temperature up to 1150℃, with far better resistance to thermal cycling scaling, sulfidation and carburization than 304, 304H and 347H. It retains high impact toughness down to -268℃ and is fully non-magnetic after solution annealing.
It performs well against oxidizing acids such as nitric acid, but has poor resistance to chloride ions and strong reducing acids. Long-term constant temperature service at 425~860℃ tends to precipitate σ-phase and cause embrittlement. It is specially applied to high-temperature furnace, heat treatment, petrochemical cracking, incinerator and other high-temperature environments without severe chloride corrosion, serving as premium dedicated heat-resistant raw material for industrial equipment.

Chemical element content (%)

Specification：1.00~300.00mm

Application:It is mainly used to manufacture seawater desalination equipment shafts, offshore platform seawater valve stems, FGD heat exchanger mandrels, pulp bleaching precision valve spools, high-chloride pump shafts for oil & gas extraction, corrosion-resistant fasteners for hydrometallurgy, stressed bars for high-corrosion chemical reactors, marine seawater pipeline flanges, seawater cooling system bolts, high-chloride sensor mandrels for instruments, waste incineration desulfurization fittings, etc.
Widely applied in seawater desalination projects, offshore oil & gas platforms, power plant flue gas desulfurization units, paper bleaching production lines, hydrometallurgy, marine ship equipment, fine chemical high-corrosion devices, high-salt water treatment equipment, offshore wind power seawater cooling systems and other industries.

Core Advantages Over Competitors

1. High quality stability: Full closed-loop production and online spectral non-destructive inspection strictly control key alloy elements including C, Cr, Ni, Mo, Cu and N to fully meet ASTM A276 and national standards. Uniform distribution of molybdenum and nitrogen ensures negligible batch fluctuation in PREN, mechanical strength and weldability for consistent mass production of marine and chemical corrosion parts.

2. Excellent surface quality: Dedicated high-precision cold drawing and centerless grinding lines produce bars free of oxide scale, scratches and pits with mirror finish. Smooth surface reduces tool wear and chloride-induced surface stress concentration to greatly extend fatigue life of parts under seawater and high-chloride 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 S31254 bright bar 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.