304H  is a high-carbon heat-resistant austenitic stainless steel bright bar derived from grade 304 series, with controlled carbon content of 0.04%~0.10%, higher than standard 304 and 304L. It adopts classic 18Cr-8Ni austenitic matrix and is non-magnetic under solution annealed state.
Carbon delivers solid-solution strengthening, greatly improving high-temperature rupture strength and creep resistance. It resists softening, deformation and creep failure under long-term high-temperature pressure service at 500~870°C, and withstands short-term oxidation up to 925°C. It features balanced room-temperature mechanical properties, stable tensile & yield strength and outstanding ductility, enabling uniform plastic deformation under load to avoid brittle fracture. It cannot be hardened via heat treatment; cold working causes work hardening, while annealing restores toughness.
It offers stable machinability for CNC turning, milling and drilling, excellent thermoplasticity for smooth hot rolling & forging, and supports cold forming including bending, stamping and cold heading. Its room-temperature resistance to atmosphere, fresh water and mild acid & alkali is comparable to standard 304. Due to high carbon content, chromium carbide precipitation easily occurs with long-term exposure at 450~850°C, leading to intergranular corrosion sensitization after welding. It is mainly applied for high-temperature pressure-bearing and non-severe corrosive environments, serving as core raw material for high-temperature heat exchange and pressure parts in boilers, power generation and petrochemical industries.

Chemical element content (%)

Specification：1.00~300.00mm

Application:It is mainly used to manufacture high-temperature pressure-bearing shafts, boiler superheater mandrels, steam pipe connectors, petrochemical high-temperature heat exchanger valve stems, power plant furnace fittings, heat treatment furnace tooling, high-temperature reactor fasteners, industrial hot air pipe accessories, small high-temperature pressure flanges, gas high-temperature valve bodies, etc.
Widely applied in thermal power generation, boiler pressure vessels, petrochemical refining, industrial heat treatment furnaces, high-temperature heat exchange equipment, gas thermal equipment, high-temperature fluid pipelines, metallurgical high-temperature auxiliary machinery and other industries.

Core Advantages Over Competitors

1. High quality stability: Full closed-loop production and online quality inspection strictly control carbon, chromium, nickel, silicon and manganese elements, with carbon precisely limited within 0.04%~0.10%. Minimal batch fluctuation in high-temperature creep strength, hardness and mechanical properties ensures consistent performance for 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 extend fatigue life of parts under high temperature; secondary polishing is unnecessary for most 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.