S30432   is a high-grade austenitic heat-resistant stainless steel bright bar strengthened by composite alloying elements Cu, Nb, N and B. Optimized based on 304H, it contains 0.07%~0.13% carbon, 2.5%~3.5% copper, 0.2%~0.6% niobium plus trace nitrogen and boron, specially developed for ultra-supercritical power generation units.
Dispersion strengthening from nano copper-rich precipitates, Nb(C,N) and M₂₃C₆ carbides delivers outstanding creep and stress rupture resistance under long-term high-temperature & high-pressure steam service at 600~680℃. Its allowable stress at 600℃ is 25%~30% higher than TP347H, and it maintains stable short-term oxidation resistance up to 700℃.
It features balanced room-temperature mechanical properties, sufficient tensile & yield strength and excellent ductility for uniform plastic deformation without brittle fracture. It cannot be hardened by heat treatment; cold working induces work hardening, while solution annealing restores high toughness. It has excellent thermoplasticity for smooth hot rolling & forging, and supports cold forming processes including bending, cold heading and stamping, with stable machinability for CNC turning, milling and drilling.
Niobium binds carbon to significantly reduce intergranular corrosion sensitization after welding. It boasts superior high-temperature steam oxidation resistance with dense, non-spalling oxide scale and stable microstructure without embrittlement during long-term high-temperature service. It serves as cost-effective premium heat-resistant raw material for high-temperature pressure-bearing shafts, high-temperature valve bodies and boiler fasteners in thermal power, solar thermal and petrochemical industries.

Chemical element content (%)

Specification：1.00~300.00mm

Application:It is mainly used to manufacture high-temperature pressure-bearing shafts for ultra-supercritical boilers, superheater & reheater mandrels, high-temperature header flanges, steam pipe connecting bolts, petrochemical cracking furnace high-temperature valve stems, fasteners for solar thermal heat exchange equipment, heat treatment furnace tooling, stressed bars for high-temperature reactors, small high-temperature structural parts of gas turbines, power plant furnace fittings, etc.
Widely applied in supercritical & ultra-supercritical thermal power units, solar thermal heat exchange equipment, petrochemical high-temperature cracking devices, industrial heat treatment furnaces, gas thermal high-temperature equipment, waste incineration waste heat boilers, high-temperature high-pressure fluid pipelines and other industries.

Core Advantages Over Competitors

1. High quality stability: Full closed-loop production and online spectral inspection strictly control key alloy elements including C, Cr, Ni, Cu, Nb, N and B to fully meet GB and ASME standards. Uniform precipitation of copper-rich phases and Nb carbonitrides ensures negligible batch fluctuation in high-temperature creep strength, hardness and weldability for consistent mass production of high-temperature pressure parts.

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

3. Ultra-high dimensional accuracy: Precision 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 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.