321H  is high-carbon titanium-stabilized austenitic heat-resistant stainless steel bright bar, high-temperature enhanced grade based on standard 321. 
It adopts dual strengthening of high carbon and titanium: Titanium combines carbon preferentially to form stable TiC and avoid chromium depletion at grain boundaries, solving intergranular corrosion under long-term heating at 425~850℃. Carbon solid-solution strengthening greatly improves stress rupture strength and creep resistance at 500~800℃, with much higher allowable stress than standard 321 and 304H, resisting creep deformation and fracture under long-term high-temperature pressure, specially developed for medium-high temperature pressure parts in boilers, thermal power and petrochemical industries.

Chemical element content (%)

Specification：1.00~300.00mm

Application: It is mainly used to manufacture boiler superheater & reheater mandrels, thermal power steam pipe bolts and flanges, medium-high temperature pressure valve stems for petrochemical refining, stressed bars for medium-temperature heat exchangers, medium-high temperature pipe fittings for waste incineration, load-bearing shafts for heat treatment high-temperature tooling, fasteners for power plant medium-temperature auxiliary machines, high-temperature hot air circulation valve bodies, high-temperature stressed standard parts for thermal pipe networks, connectors for chloride-free high-temperature reactor equipment, etc.
Widely applied in thermal power boiler auxiliary equipment, petrochemical medium-high temperature cracking units, waste incineration waste heat boilers, HVAC medium-high temperature heat exchange systems, industrial heat treatment furnaces, thermal steam transmission pipe networks, high-temperature reactor equipment with chloride-free media 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 C, Cr, Ni, Ti, carbon stably limited 0.04~0.10% with qualified Ti/C ratio. Uniform controllable austenitic grain structure ensures negligible batch fluctuation of high-temperature creep strength, anti-sensitization and mechanical properties for consistent mass production of boiler and petrochemical high-temperature pressure parts.

2. Excellent surface quality: Dedicated high-precision cold drawing & centerless grinding lines produce bars free of scale, scratches and pits with smooth flat finish. Smooth surface reduces alternating thermal stress concentration to extend fatigue life of parts under long-term high-temperature service; secondary polishing is unnecessary for most 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 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.