300 series stainless coil is a flat-rolled austenitic stainless steel supplied in coils for cutting, forming, welding and continuous production. It is commonly chosen for its combination of formability, weldability and corrosion resistance. The right purchase starts with the actual service environment: 304 suits many general duties, 316L adds molybdenum for improved resistance to chloride-related pitting, and 310S is considered for elevated-temperature oxidation service. A grade name alone does not define the finish, dimensional tolerance or end-use approval.
Henan GDD Metal Materials Co., Ltd. sources and supplies 300 series coils for fabricators and distributors. Ask for an offer based on one grade, one delivery standard and a complete size/finish schedule. For the broader mix of 200, 300 and 400 series, see our stainless steel coil range; for narrow-width stamping feedstock, see precision stainless strip.
| Item | Order specification / options |
|---|---|
| Product / grades | 300 series austenitic stainless coil; 304, 304L, 316, 316L, 321 or 310S, subject to availability |
| Order standard | ASTM A240/A240M with applicable general requirements; EN 10088-2; JIS G 4304 / G 4305; or GB/T 4237 / GB/T 3280, as applicable to rolling route and contract |
| Rolling route | Cold rolled or hot rolled, specified with grade, gauge and finish |
| Indicative thickness | 0.20–12.00 mm across available routes; confirm grade-specific gauge, tolerance and stock before order |
| Indicative width | 600–2000 mm; narrower slit widths by agreed processing and tolerance |
| Surface | No.1, 2B, BA, No.4 or other approved finish; finish availability depends on rolling route and grade |
| Coil ID / mass | 508 or 610 mm ID; indicative 3–10 t per coil, confirmed against line and transport limits |
| Edge / processing | Mill or slit edge; slitting, leveling, cut-to-length or protective film by agreement |
| Inspection / documents | Heat-linked MTC, dimension and surface checks; third-party inspection and EN 10204 3.1 documentation if agreed before production |
| Packing / supply | Protected, strapped export coils with identification labels; MOQ and delivery schedule by quotation |
The ranges above describe possible supply across multiple grades and rolling routes; they are not a promise that every grade, thickness, width and finish combination is stocked together. Final tolerances and acceptance criteria follow the agreed standard edition and purchase order.
304 is a practical baseline for interior equipment, forming, kitchenware and many general fabrication jobs. 304L has lower specified carbon and is commonly considered when welding or corrosion resistance at the heat-affected zone matters. Specify the actual grade and fabrication route; neither is a universal solution for concentrated chlorides or every food-contact process.
Molybdenum in the 316 family improves resistance to chloride pitting relative to standard 304 in many conditions. 316L adds a low-carbon designation often chosen for welded equipment. Coastal air, cleaning chemicals, water chemistry, crevices and operating temperature still affect corrosion performance; the alloy is not immune to seawater or stress-corrosion cracking.
321 is titanium-stabilized and may be selected where a design needs resistance to sensitization during specified thermal exposure. 310S is a higher-chromium, higher-nickel heat-resistant grade used for suitable hot equipment and oxidation exposure. These grades answer different design problems: 310S should not be sold as a blanket upgrade for chloride service, and operating temperature limits require engineering review of the actual atmosphere, loading and thermal cycle.
“300 series” is a family description, not an inspection standard. ASTM A240/A240M specifies stainless flat products and chemistry for its scope, with relevant general requirements such as ASTM A480/A480M. In Europe, EN 10088-1 identifies grades, while EN 10088-2 gives delivery requirements for general-purpose corrosion-resistant sheet, plate and strip. In Japan, JIS G 4305 covers cold-rolled flat product and JIS G 4304 covers hot-rolled product. In China, GB/T 20878 identifies grades and chemistry, while GB/T 3280 and GB/T 4237 cover cold- and hot-rolled flat product respectively.
Typical designation cross-references include 304 / UNS S30400 / EN 1.4301 / SUS304 / GB S30408; 304L / S30403 / EN 1.4307 / SUS304L / GB S30403; 316L / S31603 / EN 1.4404 / SUS316L / GB S31603; 321 / S32100 / EN 1.4541 / SUS321 / GB S32168; and 310S / S31008 / EN 1.4845 / SUS310S / GB S31008. These are useful starting points for a drawing review, not automatic certifications of interchangeability. Chemical limits, mechanical delivery condition, thickness tolerance, surface terminology, sampling and inspection can differ; state one governing standard and edition on the purchase order, then check the heat-specific MTC against it.
300 series: Austenitic chromium-nickel grades such as 304 and 316L offer strong all-round forming and welding characteristics; molybdenum-bearing 316L can perform better in many chloride environments. Nickel content and alloying typically increase material cost. These steels are generally low in magnetic response in the annealed condition, but cold work can change that response.
200 series: Grades such as 201 are also austenitic, using more manganese and nitrogen with less nickel in many compositions. They can suit selected indoor decorative and forming work at a different alloy cost. Do not infer that every 200-series grade has the same corrosion performance: confirm the exact grade and environment instead of substituting 201 for 304 or 316L solely by appearance.
400 series: This is not one microstructure. Ferritic 430 is magnetic and useful for certain appliance and decorative parts; martensitic 410 can be hardened for wear-oriented components after suitable heat treatment. Some 400-series alloys offer useful oxidation performance or lower nickel exposure, but grade, forming, welding and corrosion behavior differ substantially. For wet or chloride-prone equipment, compare the specific alloy and service conditions before substituting.
For stamping or continuous forming, provide the target thickness tolerance, minimum usable width, edge condition and maximum coil mass accepted by your line. A 2B cold-rolled finish is often specified for clean, consistent processing, while No.1 is a hot-rolled finish commonly sent to further industrial fabrication. BA, No.4 or brushed appearances require a sample or agreed surface reference if cosmetic consistency matters. Ask for inner/outer coil protection, orientation, ID, label/heat number and a packing plan before shipment.
A 0.8 mm × 1219 mm coil with a 5 t target weight is a quotation example, not a current stock guarantee. Coil length and yield depend on density, actual thickness, edge trim and processing loss; send your press-feed or slitting plan so the offered coil size fits the equipment. For equipment requiring sanitary, pressure or regulated end-use approval, identify the relevant final-product rules separately from the steel grade and MTC.
A buyer making formed panels could request 304 or 304L cold-rolled 2B coil, an agreed thickness tolerance and protective film. The practical decision is whether the forming severity and joining method justify a low-carbon grade, plus whether the delivered surface matches the visible finish requirement.
For outdoor housings exposed to salt spray and washdown, a buyer could compare 304 with 316L and specify drainage, crevice details and cleaning regime. The quotation should identify the grade and surface, while the designer evaluates actual chloride exposure rather than relying on a generic “marine grade” label.
For a high-temperature sheet-metal part, the engineering team could evaluate 310S with the expected peak/continuous temperature, atmosphere and cycling. A 321 option may be relevant to a different thermal or welded service. The material choice must be checked against the whole design, not decided from a single temperature number.
These are illustrative purchasing scenarios, not claims about completed orders or customer testimonials.
On an agreed order, we can coordinate heat or coil identification, the mill test certificate (MTC), certificate of origin (COO), commercial invoice, packing list and transport/customs papers. An EN 10204 3.1 certificate, third-party inspection and any applicable export license should be confirmed for the product and destination before the order is finalized. Export paperwork can be arranged for compliant shipment under the agreed trade terms; an MTC verifies reported material tests and does not by itself certify a finished tank, pressure vessel, food-contact article or medical device.
No. It often offers better pitting resistance in chloride exposure, but 304 may meet a milder duty at lower alloy cost. Check concentration, temperature, surface condition and crevice design.
No. Austenitic grades can become more magnetic after cold work, while magnetic response alone cannot establish chemistry. Use grade marking, heat traceability and the MTC, with independent analysis when required.
No. Multi-standard claims require the actual heat, product condition and test results to satisfy every stated edition and any added contract tests. Ask for the governing standard and agreed dual certification before ordering.
Send grade and governing standard, cold/hot-rolled route, thickness and tolerance, width, finish, edge, ID, target coil mass, quantity, destination port, application environment and requested inspection/documents. Attach a drawing or sample finish if appearance or forming is critical.
Ready to compare grades or place an RFQ? Send your coil schedule and required certificate wording through our contact page. We will quote the available specification and identify any grade, finish or size combination that needs mill confirmation.
