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 industrial heat treatment furnace rollers, kiln anchor nails, high-temperature furnace supports, annealing furnace tooling, incinerator flue shafts, petrochemical cracking furnace valve stems, boiler high-temperature fasteners, gas burner bars, carburizing furnace fittings, heat treatment tray support shafts, metallurgical high-temperature tooling, small nuclear power high-temperature structural parts, high-temperature furnace bolts, stressed bars for ceramic kilns, etc.
Widely applied in industrial heat treatment furnaces, waste incineration waste heat boilers, petrochemical high-temperature cracking units, metallurgical heating furnaces, ceramic kilns, thermal power boiler high-temperature auxiliary parts, aerospace high-temperature combustion chamber fittings, nitric acid chemical equipment, photovoltaic high-temperature sintering furnaces and other industries.

Core Advantages Over Competitors

1. High quality stability: Full closed-loop production and online spectral inspection strictly control core alloy elements including C, Cr, Ni, Si and Mn to fully meet ASTM and national 310S standards. Uniform and stable austenitic microstructure without segregation ensures negligible batch fluctuation in high-temperature oxidation resistance, creep strength and mechanical properties for consistent mass production of high-temperature furnace components.

2. Excellent surface quality: Dedicated high-precision cold drawing and centerless grinding lines produce bars free of peeling, oxide scale, scratches and pits with superior flatness and mirror finish. Smooth surface reduces tool wear and alternating high-temperature stress concentration to greatly extend fatigue life of parts under thermal service; secondary polishing is unnecessary for conventional 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 1045 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.