GB Standard S32100 321 Cold Rolled Stainless Steel Sheet Plate With Bright Polished

GB Standard S32100 321 Cold Rolled Stainless Steel Sheet Plate With Bright Polished

Grade Mark: S32100 / 321 Titanium Stabilized Austenitic Stainless Steel, compliant with GB national standard & international ASTM specification

Production Craft: Precision multi-pass cold rolling + special stabilization annealing, finished with customized bright polished finish

Available Surface: Base 2B cold rolled surface + high-gloss bright polished finish as core supply, No.4 hairline optional upon client request

Core Alloy Feature: Titanium fixed carbon structure, outstanding anti-sensitization performance under continuous 420~815℃ temperature fluctuation

Product Differentiation Point: Different from low-carbon anti-weld-corrosion 317L/316L and high-molybdenum acid-resistant 317 series, 321 relies on titanium element to lock free carbon, targeting medium-high temperature alternating service environment; bright polished version combines high-temperature stability and premium ornamental texture

Application Orientation: High-temperature pipeline accessories, boiler interior components, heat treatment equipment casing, high-temperature exhaust equipment and high-end heat-resistant decorative engineering

Key attributes

Products Description

321 S32100 cold rolled stainless steel is a classic titanium-stabilized heat-resistant stainless steel under GB standard, developed specially for equipment exposed to repeated heating and cooling circulation. Unlike 316/317 family which rely on molybdenum to realize anti-chloride corrosion and low-carbon design to avoid weld corrosion, 321’s core alloy design centers on titanium element addition. Titanium preferentially combines free carbon inside metal matrix into stable titanium carbide, fundamentally stop chromium carbide precipitation when staying in sensitization temperature range for long hours. Our stock products take high-gloss bright polished finish as core selling point, different from conventional industrial matte 2B ordinary 321 sheet in market. After fine cold rolling and mirror polishing treatment, the plate owns compact seamless bright surface without scratch, oxide spot and grinding trace, satisfying dual demands of high-temperature structural performance and high-grade appearance decoration at the same time. All raw material composition, mechanical indicators and dimensional tolerance are fully inspected per GB standard before leaving factory, suitable for domestic engineering matching and global export customs acceptance.

Unique Alloy Advantage & Processing Craft Superiority

The core competitive strength of GB standard 321 stainless steel originates from titanium stabilization mechanism. For regular 304,316 steel, long-term service between 420℃ and 815℃ will trigger carbon precipitation at grain boundary, cause local chromium depletion and subsequent intergranular corrosion, leading to equipment crack and leakage in later stage. With fixed titanium composition, 321 will not produce sensitization corrosion no matter long-time constant temperature staying or frequent cold-hot alternating operation, either after factory welding or long-term field splicing construction. Even without post-weld solution heat treatment, weld zone keeps consistent anti-corrosion and high-temperature stability same as base material, greatly cutting post-processing cost for high-temperature equipment manufacturers.

Our cold rolling production strictly follows GB manufacturing norms, raw material slab passes chemical composition spot check first, then goes through multi-pass precision rolling to control thickness tolerance in narrow range; subsequent closed nitrogen protection annealing removes rolling residual stress and homogenizes internal grain, laying good foundation for later bright polishing. The bright polishing process adopts multi-stage fine grinding technology step by step to remove tiny surface flaws of cold rolled base plate, finally forming uniform mirror bright surface with strong metal texture. Compared with pickled hot rolled 321 plate with rough dark surface, our polished cold rolled sheet can be directly installed for exposed decoration without secondary on-site polishing, shorten construction period and reduce extra processing expense of finished projects. Meanwhile, refined grain structure after cold rolling improves ductility of raw material, the polished sheet can finish bending, stamping and arc forming smoothly without surface bright layer peeling or cracking.

In terms of comprehensive environmental adaptability, besides prominent medium-high temperature anti-sensitization property, 321 also retains excellent atmospheric and weak corrosive gas resistance. It works steadily under dry hot flue gas, industrial high-temperature waste gas and normal humid air, no surface rust and discoloration occurs for long-term outdoor placement. Without high molybdenum addition like 317 series, 321 cannot stand high-concentration chloride and strong acid medium erosion, which makes it cost-effective professional material focusing on heat-resistant working condition instead of heavy anti-corrosion chemical equipment.

Graded Application Scenarios Based On Bright Polished Feature

High-Temperature Industrial Equipment Manufacturing

Conventional 2B base material of 321 is used for hidden boiler inner lining, heat exchanger internal baffle and industrial furnace auxiliary structural plate; bright polished finished sheets are applied for exposed outer shell of small experimental high-temperature furnace, heat treatment equipment outer decorative enclosure and high-temperature oven visible panel. The bright polished surface keeps neat appearance under long-term radiant heat, not easy to yellow and lose gloss, matching high-standard finished equipment appearance requirement.

Exhaust & Flue System Supporting Components

Polished 321 sheets are widely processed into exhaust pipe outer decorative wrapping plate, engine high-temperature exhaust shielding casing and waste heat recovery equipment outer cover in machinery, automobile and environmental protection industry. Frequent temperature rise and fall will not trigger weld corrosion and surface aging, the bright surface effectively blocks surface soot adhesion and is convenient for daily wiping cleaning.

High-End Heat-Resistant Architectural Decoration

It is the exclusive preferred material for high-temperature workshop facade decorative panel, industrial park heat equipment peripheral decoration and sauna/constant temperature equipment outer decorative parts. In spaces with ambient temperature higher than ordinary room temperature all year round, common decorative stainless steel is easy to deform and fade under long-term heat radiation, while polished 321 maintains flat shape and stable bright texture permanently.

Petrochemical Low-Temperature Heat Exchange Auxiliary Parts

Used for low-medium temperature heat exchange equipment outer protective plate and non-corrosive furnace pipeline decoration accessories in petrochemical factory, adapt to workshop high-temperature environment without corrosion failure, bright surface promotes overall grade of factory facility layout.

On-Site Processing & Long-Term Maintenance Specification

Bright polished 321 cold rolled sheet needs to stick customized PVC protective film on bright surface before delivery to avoid scratch during cutting, transportation and installation; tear off the protective film only after all construction is completed to keep original mirror gloss. During welding construction, properly control welding temperature to reduce high-temperature smoke spatter splashing on polished surface; if local spatter appears, wipe with neutral polishing paste and soft cloth to restore smoothness quickly.

Daily maintenance cost of finished products is extremely low, wipe surface floating dust and slight oil stain with soft cotton cloth dipped in neutral water-based cleaning agent regularly, no need for regular anti-rust paint spraying and special anti-corrosion maintenance. Placed in ventilated dry environment, polished layer can keep original gloss for many years without peeling and fading. Even after long-term periodic high-temperature heating, internal titanium stabilized structure ensures no hidden grain boundary corrosion inside plate, greatly extend service cycle of finished equipment and decorative components.

Core Reasons to Select Our GB Standard Bright Polished 321 Cold Rolled Sheet

1. First, titanium stabilized alloy design realizes permanent anti-sensitization under medium-high temperature alternating environment, the core advantage unavailable for 304,316 and high-molybdenum 317 series.
2. Second, double supply of original 2B plate and customized bright polished finish realizes structural and decorative dual-purpose, one material meets hidden lining and exposed decoration two different project needs.
3. Third, all products implement GB national standard inspection, complete inspection documents can be provided to support domestic project acceptance and overseas import customs clearance.
4. Fourth, precision cold rolling plus fine polishing craft guarantees stable flatness and uniform bright effect, reduce customer’s later surface rework loss.
5. Fifth, cost-effective formulation without excessive high molybdenum element lowers comprehensive procurement cost compared with 317/317L high-alloy steel for heat-resistant projects.
6. Sixth, flexible customized service including arbitrary thickness cutting, fixed size slitting and partial surface polishing satisfies personalized drawing demand from various equipment manufacturers and decoration contractors.

We can supply GB standard material test report, free sample test and targeted bulk quotation according to your working temperature and application environment.