304/304L Stainless Steel Coils

Good Corrosion Resistance: Excellent resistance to oxidation and corrosion in fresh water, mild chemical media, atmospheric conditions, and food products. The 304L grade provides additional protection against intergranular corrosion after welding.

Excellent Formability and Ductility: Superior elongation (≥40%) allows for deep drawing, bending, stamping, spinning, and roll forming, making 304/304L the most formable austenitic stainless steel grade.

Cost-Effective Solution: Lower alloy content (no molybdenum) compared to 316/316L makes 304/304L a more economical choice for applications where chloride-induced pitting is not a concern.

Precise Dimensional Tolerances: Tight thickness tolerances (up to ±0.03mm for cold-rolled coils) ensure consistent material feeding for automated production lines and high-volume stamping operations.

Excellent Weldability: 304L grade ensures low carbon content for superior weld performance, with reduced risk of intergranular corrosion in welded fabrications. Suitable for TIG, MIG, laser, spot, and seam welding.

Smooth Surface Quality: Available in 2B (cold-rolled bright finish), BA (bright annealed), No.1 (hot-rolled annealed and pickled), No.4 (polished), HL (hairline), and mirror finishes.

Good Mechanical Strength: Adequate tensile and yield strength with excellent ductility for structural supports, equipment frames, and pressure applications.

Wide Temperature Range: Suitable for cryogenic applications down to -196°C and continuous service up to 800°C (1472°F). Retains excellent toughness at low temperatures.

International Certifications: Coils can be certified by ABS, BV, DNV, LR, GL, RINA, CCS, KR, and NK, and comply with NORSOK and ASME standards for general industrial applications.

These standards ensure that our 304/304L stainless steel coils meet global requirements for chemical composition, mechanical performance, dimensional tolerances, and testing methods for general industrial and sanitary applications.

The lower carbon content in 304L minimizes carbide precipitation during welding, providing enhanced resistance to intergranular corrosion compared to standard 304, especially in welded fabrications and service in the sensitization temperature range (425–870°C).

High-Temperature Tensile Properties (Typical Values):

Heat Treatment Condition:
Both 304 and 304L stainless steel coils are normally supplied in the annealed condition. Solution annealing at 1010–1080°C followed by rapid cooling restores full corrosion resistance, relieves internal stresses from rolling, and ensures optimal ductility for further forming operations.

Delivery Condition Options:

Hot-Rolled (HR): Annealed and pickled (No.1 finish) or black hot-rolled

Cold-Rolled (CR): 2B finish (bright cold-rolled), 2D finish (dull cold-rolled), BA finish (bright annealed)

Thickness Tolerances (Cold-Rolled – ASTM A480):

Width Tolerances (Cold-Rolled – ASTM A480):

Flatness Tolerances:

Raw Material Selection: High-quality 304/304L stainless steel slabs from certified mills (Baosteel, TISCO, POSCO, Outokumpu, Jindal) with certified chemical composition and traceability.

Reheating: Slabs heated to 1200–1250°C in reheating furnaces for hot rolling.

Hot Rolling: Heated slabs passed through roughing and finishing stands (continuous hot strip mill) to reduce thickness to 3-12mm (hot-rolled coils).

Laminar Cooling: Controlled water cooling to achieve desired microstructure and mechanical properties.

Coiling: Hot-rolled strip coiled at approximately 600-700°C.

Annealing: Hot-rolled coils undergo solution annealing at 1010–1080°C to restore corrosion resistance.

Pickling: Removal of oxide scale using mixed acid (HNO₃ + HF) for No.1 finish.

Cold Rolling: Hot-rolled coils further reduced to 0.3-6mm through 2-3 cold rolling passes.

Bright Annealing (Optional): Cold-rolled coils annealed in hydrogen atmosphere furnace for BA finish, producing bright, oxide-free surface.

Skin Pass (Temper Rolling): Light cold rolling (0.5-1.5% reduction) to improve flatness, surface finish, and mechanical properties.

Slitting (Optional): Wide coils cut into narrower strips per customer requirements (20mm to 600mm width).

Inspection & Testing: Dimensional check, PMI, mechanical testing, surface inspection.

Coiling & Packaging: Coiled to specified ID/OD, wrapped with moisture barrier paper, steel strapped.

Chemical Analysis: Spectrometer verification or PMI for alloy elements (Cr 18-20%, Ni 8-12%).

Mechanical Testing: Tensile strength, yield strength, elongation, hardness per ASTM A370.

Dimensional Inspection: Thickness gauge, width measurement, flatness check, coil ID/OD verification.

Surface Inspection: Visual check for surface defects (scratches, pits, roll marks, edge cracks).

Intergranular Corrosion Test: ASTM A262 Practice E for 304L (upon request).

Pitting Corrosion Test: ASTM G48 (upon request).

Positive Material Identification (PMI): Upon customer request.

Third-Party Inspection: SGS, BV, DNV, TUV, Intertek available upon customer request.

Food & Beverage Industry: Dairy processing tanks, brewery fermentation vessels, food storage silos, commercial kitchen equipment, countertops, sinks, refrigeration panels, baking trays, mixing bowls.

Pharmaceutical Equipment: Cleanroom panels, pharmaceutical vessels, sterile process equipment, WFI storage tanks, bioreactor shells, laboratory tables.

Architectural & Construction: Building cladding, roofing panels, curtain walls, handrails, balustrades, elevator interiors, escalator trim, door frames, window trim.

Kitchenware & Housewares: Cookware, pots and pans, sinks, kitchen utensils, flatware, mixing bowls, bakeware, refrigerator liners.

Automotive & Transportation: Trim components, exhaust system parts, fuel tanks, radiator components, railcar body panels, bus body panels.

Cryogenic Applications: Liquid nitrogen storage tanks, LNG equipment, low-temperature process vessels (304 retains toughness at -196°C).

General Industrial Fabrication: Equipment frames, machine guards, hoppers, chutes, workbenches, conveyors, storage bins.

Water Treatment: Filtration equipment, aeration tanks, chemical feed tanks, pipe supports.

HVAC Systems: Ductwork, air handler housings, fan housings, diffusers.

Pressure Vessels: ASME code pressure vessels, storage tanks, receivers, accumulators.

Electronics: Enclosures, chassis, brackets, battery cases, precision components.

Standard Packaging:

Coils wrapped with moisture-proof paper and VCI (Vapor Corrosion Inhibitor) film

Outer steel strapping (4-8 straps per coil depending on weight)

Wooden pallet or steel skid for coil protection during transport

Plastic end caps for slit coils (to protect edges)

Export cartons for small slit coils (less than 50kg)

Clear labeling with grade (304/304L), heat number, dimensions, coil weight, standard, and order number

Womic Steel's Shipping Strengths:

Direct cooperation with global shipowners (Maersk, MSC, COSCO, Hapag-Lloyd) for competitive freight rates

Professional loading and securing teams prevent coil damage during transit (horizontal or eye-to-sky positioning)

Efficient document preparation (EN 10204 Type 3.1 MTR, packing list, commercial invoice, certificate of origin) minimizes customs delays

Rapid delivery time – standard coils (thickness 0.5-4mm, width 1219mm) maintained in ready stock over 10,000 tons

Continuous cargo tracking and after-sales follow-up with destination agent support

1. What is the difference between 304 and 304L stainless steel coils?
The main difference is carbon content. 304L has lower carbon (≤0.03% vs ≤0.08%), which prevents chromium carbide precipitation during welding and provides better resistance to intergranular corrosion. For welded fabrications exposed to temperatures between 425-870°C, 304L is preferred.

2. Can 304/304L coils be used in marine environments?
304/304L is not recommended for seawater or high-chloride environments. For marine applications, use 316/316L or duplex stainless steel coils which contain molybdenum for enhanced pitting resistance.

3. What is the standard coil width for 304 stainless steel coils?
Standard widths are 1000mm, 1219mm (4 feet), 1250mm, 1500mm, 1524mm (5 feet), and 2000mm. Custom widths from 600mm to 2000mm available through slitting.

4. What surface finish is best for deep drawing applications?
2B finish (cold-rolled bright annealed) is recommended for deep drawing applications due to its uniform surface and consistent lubricant retention. BA finish also works well for severe forming.

5. Can you provide coils with trimmed (slit) edges?
Yes. We offer slitting services to produce narrow strips from 20mm to 600mm width with slit edge tolerances of ±0.5mm. Slit coils are ideal for stamping and roll forming operations.

6. Are 304L coils suitable for cryogenic service?
Yes. 304L retains excellent impact toughness down to -196°C (-321°F) and is widely used for liquid nitrogen, liquid oxygen, and LNG applications. No ductile-to-brittle transition occurs.

7. What is the maximum temperature for continuous service?
800°C (1472°F) for 304 and 304L. For intermittent service, up to 850°C (1562°F). Above 800°C, consider 310S or 321 stainless steel coils.

8. Do you provide material test reports (MTR) and certification?
Yes, every shipment includes EN 10204 Type 3.1 MTR with chemical analysis and mechanical properties. Third-party inspection (SGS, BV, DNV, TUV, Intertek) available upon customer request.

Complete Size Range: Thickness from 0.3mm to 12mm, width from 600mm to 2000mm – all standard sizes in stock

Strict Quality Control: ISO 9001:2015, PED 2014/68/EU, and API Q1 certified facilities

Full Traceability: Heat number on each coil – traceable to original mill certificate

Slitting Services: In-house slitting capability for narrow strips (20mm to 600mm)

Surface Finish Options: 2B, BA, No.1, No.4, HL, Mirror, Embossed – all available

Large Inventory: Over 10,000 tons in stock – ready for immediate dispatch

Global Delivery: Exported to over 50 countries with reliable logistics support

Competitive Pricing: Direct mill sourcing eliminates middlemen costs

Tel / WhatsApp:

Victor: +86 15575100681

Jack: +86 18390957568

E-mail: info@womicstainless.com

Website: www.womicsteel.com

Contact Womic Steel today for a competitive quote on 304/304L stainless steel coils. We offer certified quality, slitting services, rapid delivery, and reliable global shipping for your industrial manufacturing and fabrication projects.

Stock Examples (Cold-Rolled 304L Coils – 2B Finish – Width 1219mm / 4 feet):

Stock Examples (Cold-Rolled 304 Coils – BA Finish – Mirror Surface – Pharmaceutical Grade):

Stock Examples (Hot-Rolled 304L Coils – No.1 Finish – Annealed & Pickled):

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