AISI S30908 309S Cold Rolled Stainless Steel Sheet 0.3mm 0.7mm 1.2mm Thick

309S S30908 is a professional medium-high heat resistant stainless steel positioned between general 304 and ultra-high temperature 310S, completely different from stamping-focused 305, kitchen-specific 304J1 and deep drawing 304Cu grades. With upgraded high chromium and nickel alloy proportion, this material is purposely developed to cope with cyclic high-temperature working environment, effectively resisting high-temperature oxidation and scaling under continuous heating conditions. Our stocked 0.3mm, 0.7mm and 1.2mm three common thin gauges adopt advanced cold rolling process, achieving ultra-precise thickness tolerance and superior flatness, avoiding the coarse surface and poor forming performance of traditional hot rolled heat-resistant plates. It can be cut, bent and fabricated flexibly while retaining inherent high-temperature stability, becoming the mainstream thin-size heat-resistant raw material for thermal industrial accessory production.

Product Performance & Unique Advantages

The core competitiveness of 309S cold rolled sheet lies in outstanding cyclic high-temperature oxidation resistance. Under continuous working temperature up to 850℃~950℃, the material surface will not produce large-area peeling oxide layer, and internal structure stays intact after repeated cold and hot alternation, solving the short service life defect of ordinary stainless steel under long-term high-temperature circulation. Compared with thick hot rolled 309S plates, these three thin specifications own better ductility and bending property, easy to wrap irregular furnace inner wall and complex heat insulation structure without pre-heat treatment before forming. Meanwhile, 309S holds decent resistance to high-temperature flue gas and weak acid volatile corrosion generated inside heating equipment, outperforming common 300-series room-temperature anti-rust steel in harsh thermal atmosphere. Precision cold rolling eliminates internal residual stress, so finished accessories keep stable shape after long-term heating and will not warp or deform.

Wide Application Fields

This three-spec thin 309S cold rolled sheet mainly serves thermal processing and high-temperature industrial supporting manufacturing. It is widely used as inner lining and shielding panel for small industrial electric furnaces, experimental heating equipment and heat treatment oven shells. In boiler and heat exchanger accessory production, it works as inner protective thin plate for flue pipeline and heat insulation wrapping material. It also gets popular in petrochemical low-medium temperature thermal reaction equipment inner lining and high-temperature exhaust pipeline inner anti-oxidation cladding. Besides thermal industry, it is applied for high-temperature resistant protective casing of heating equipment in food baking and heat processing machinery industries.

Processing and Daily Usage Tips

Thanks to cold rolled fine grain structure, 309S thin sheets can finish conventional cutting, bending and partial welding smoothly without cracking during cold forming. When used in high-temperature equipment installation, reserved expansion gap is suggested to match its small thermal expansion coefficient for longer service cycle. For finished surface maintenance, wipe accumulated high-temperature dust with dry cloth regularly; avoid long-term contact with strong corrosive liquid at room temperature to preserve original surface integrity. Its inherent anti-oxidation characteristic greatly cuts periodic replacement cost of high-temperature vulnerable parts for end manufacturers.

Reasons to Choose Our 309S S30908 Cold Rolled Sheet

First, targeted high Cr-Ni alloy formula brings reliable cyclic high-temperature anti-scaling capacity unavailable for regular 304 derivative grades. Second, three mature thin thicknesses cover most small-sized high-temperature accessory production, sufficient spot goods support fast delivery for bulk orders. Third, cold rolling production improves flatness and processability, lowering material loss during bending and wrapping construction. Fourth, balanced cost between 304 and expensive 310S realizes favorable cost performance for medium-temperature heat-resistant projects. Fifth, flexible custom surface finish and size cutting satisfy personalized accessory fabrication from global industrial buyers.

Contact us to acquire original factory inspection certificate, sample support and latest factory wholesale price.