304L 2BA Finish Stainless Steel Sheet

Core Statement: 304L (UNS S30403 / EN 1.4307) cold-rolled stainless steel sheet featuring a 2BA (Bright Annealed) finish. Designed for applications requiring low carbon content for intergranular corrosion resistance after welding, combined with a smooth, reflective, and scale-free surface.

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Product Introduction

Key Features

Low Carbon Chemistry (<= 0.030% C): Inhibits chromium carbide precipitation during welding at temperatures between 425 °C and 815 °C, eliminating the need for post-weld annealing in most structural configurations.

2BA Surface Finish (Bright Annealed): Annealed in a controlled protective atmosphere furnace and skin-passed on polished rolls. Delivers a clean, smooth, reflective surface with a typical roughness of Ra <= 0.5 um, reducing initial mechanical polishing time for sanitary fabrications.

Formability & Ductility: Excellent elongation properties (A >= 40%) supporting deep drawing, roll forming, and complex CNC press-brake bending without micro-cracking.

Traceability: Each master coil and cut sheet batch is traceable via a unique heat number stamped on the protective film and linked directly to the Mill Test Report (MTR).

Technical Specifications

Parameter	Specification / Limit	Test Standard
Grade Equivalents	UNS S30403	EN 1.4307
Density	7.93 g/cm3 (20 °C)	ASTM A240
Tensile Strength (Rm)	>= 500 MPa	ASTM E8 / EN ISO 6892-1
Yield Strength (Rp0.2)	>= 200 MPa	ASTM E8 / EN ISO 6892-1
Elongation (A50)	>= 40%	ASTM E8 / EN ISO 6892-1
Hardness	<= 92 HRB (or <= 200 HV)	ASTM E18 / EN ISO 6507-1
Thickness Tolerance	Precision cold-rolled tolerance class (e.g., +/- 0.03 mm to +/- 0.08 mm depending on gauge)	ASTM A480 / ISO 9445
Surface Roughness (Ra)	<= 0.5 um (Typical value for 2BA)	ISO 4287

Available Grades and Material Options

Alternative Low-Carbon Grades: 316L / EN 1.4404 (molybdenum-bearing for enhanced marine/chloride resistance).

Surface Finish Variants

No. 4 / Brushed: Directional polished finish (grit 150-240) available via our in-house dry/wet polishing lines.

BA (Bright Annealed): Standard 2BA bright reflective finish.

HL (Hairline): Long continuous fine polishing lines.

Protective Film Options: Laser-cut PE film (fiber laser compatible, non-residue leaving), PVC black & white film (70 um - 100 um).

Applications

Pharmaceutical & Biotech

Cleanroom wall panels, sterile storage tanks, pharmaceutical grade piping outer jackets.

Food & Beverage Processing

Milk storage silos, brewery fermentation vessels, conveyor belt components.

HVAC & Architecture

High-end elevator interiors, architectural metal trim, ventilation ductwork in corrosive environments.

Chemical & Petrochemical

Light-gauge corrosion-resistant ducting, vessel lagging, heat exchanger baffles.

Custom Thickness and Dimensions

Stock Thickness Range: 0.4 mm to 3.0 mm (Imperial gauges: 26 GA to 11 GA).

Slitting Service: Precision slitting down to a minimum width of 20 mm with burr-free edges.

Cut-to-Length & Blanking: Servo-driven leveling and shearing lines providing length tolerances within +/- 1.0 mm and diagonal squareness control within +/- 0.5 mm.

Laser Film Application: Automatic dual-side PVC/PE film lamination during leveling to prevent surface scratching during subsequent laser cutting or stamping.

Quality Control and Surface Inspection

Spectrometric Analysis: Direct-reading optical emission spectrometer (OES) used on every raw material master coil to verify precise chemical composition before rolling.

Mechanical Testing: Universal tensile testing machine verifying yield strength, tensile elongation, and hardness on transverse and longitudinal specimens per ASTM standards.

Surface Defect Inspection

Automated surface inspection systems (pinholes, scratches, oil pits).

Manual visual inspection under standardized 1000 lux lighting conditions prior to packaging.

Certification: Each shipment includes an EN 10204 3.1 Mill Test Report containing actual melt chemistry, mechanical test results, and heat treatment logs.

Packaging and Shipping

Export-Standard Wooden Pallets: Fumigation-free plywood skids or solid wooden pallets with waterproof inner kraft paper and outer moisture-proof plastic wrapping.

Edge Protection: Steel edge protectors on all four corners and steel strapping (minimum 4 horizontal, 3 vertical bands) to prevent shifting during container transit.

Lifting & Handling: Forklift channels and overhead crane lifting provisions built into master skid designs for safe unloading at destination service centers.

Container Loading: Standard 20GP/40GP container configurations optimized for heavy metal coil and sheet distribution (maximum payload up to 26-28 metric tons per container, subject to port axle-load regulations).

FAQ

Q: What is the primary difference between 304 and 304L stainless steel sheets in welded applications?

A: 304L has a maximum carbon content of 0.030%, compared to 0.08% for standard grade 304. This lower carbon level prevents chromium carbide precipitation at grain boundaries during welding (425 °C to 815 °C), eliminating intergranular corrosion susceptibility without requiring post-weld annealing.

Q: Can 2BA finish sheets be laser cut without damaging the surface?

A: Yes. Our sheets are supplied with optional laser-protective PE film (70 um to 100 um) designed to withstand fiber and CO2 laser cutting processes without leaving adhesive residue or delaminating.

Q: Are Mill Test Reports (MTRs) provided with each shipment?

A: Yes. Every delivery includes an EN 10204 3.1 certified MTR detailing the exact heat number, chemical analysis, and mechanical test results matching the coil/sheet identification tags.

Q: What is the standard thickness tolerance for your cold-rolled 2BA sheets?

A: Tolerances comply strictly with ASTM A480 or EN ISO 9445 specifications. For example, a 1.0 mm thickness sheet has a standard tolerance band of +/- 0.04 mm. Closer custom tolerances can be negotiated upon order placement.

Q: What is your minimum order quantity (MOQ) for custom cut lengths?

A: Standard stock sizes have an MOQ of 1 metric ton per thickness. For custom slitting or cut-to-length orders from master coils, the MOQ is 2 metric tons per specification to account for setup optimization.

Request a Quote

To receive a formal quotation (FOB/CIF/DDP), please provide the following technical parameters:
Thickness x Width x Length (in mm or inches)
Quantity (Total tonnage or sheet count)
Surface Finish & Film Requirements (2BA standard, with or without laser protective film)
Destination Port / Delivery Location
Special Inspection or Certification Requirements (e.g., third-party inspection by SGS/TUV, specific packaging requests)

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