316L Stainless Steel Strip Cold Rolled 2B Surface 0.4-3.0mm

ASTM A240 AISI316L Stainless Steel Sheet Strips Cold Rolled 2B Surface TISCO BAOSTEEL POSCO

1. Standard Compliance

316L stainless steel sheets/strips primarily adhere to ASTM A240/A240M-2018, which governs chromium and chromium-nickel stainless steel for pressure vessels and general applications158. This standard ensures consistent chemical composition, mechanical properties, and dimensional tolerances. Supplementary standards include:

• JIS G4305/4313 (Japan)

• GB/T 3280 (China)

• DIN EN 10088-2 (Europe).

2. Chemical Composition & Key Properties

Chemical Requirements (Weight %)

Enhanced Corrosion Resistance:

• Low carbon (≤0.03%) prevents sensitization (carbide precipitation at grain boundaries), enabling welding without post-annealing.

• Molybdenum addition (2–3%) significantly improves pitting and crevice corrosion resistance in chloride-rich environments (e.g., seawater, chemical plants).

Mechanical Properties

• Cold rolling enables higher hardness states (e.g., 1/4H, 1/2H, EH), with hardness up to HV 600.

• Retains toughness at cryogenic temperatures (as low as –253°C), suitable for liquid hydrogen storage tanks.

3. Dimensions and Tolerances

Cold-rolled 316L strips/sheets are available in versatile dimensions:

• Thickness: 0.03 mm (ultra-thin for electronics) to 6.0 mm.

• Width: 10–2,000 mm (standard), with precision slitting for narrow widths (e.g., 20–610 mm).

• Coil Parameters: Inner diameters of 200–508 mm; weights customized per tonnage requirements.

4. Surface Finishes: 2B and Beyond

• 2B Finish: Smooth, moderately reflective surface achieved by cold rolling, annealing, pickling, and light temper rolling. Standard for industrial and architectural applications.

• Alternative Finishes:

  • BA (Bright Annealed): Mirror-like finish (6K–9K) for decorative parts.

  • No.1: Rough industrial surface for further processing.

  • Hairline/Matte: Brushed or satin textures for aesthetic components.

5. Equivalent Grades Across Standards

316L is globally standardized under multiple designations:

6. Major Manufacturers and Quality Assurance

• TISCO & BAOSTEEL: Dominate Chinese supply chains, providing cold-rolled strips with SGS, ISO, and MTC certifications.

• POSCO: Supplies advanced variants like 316HN for hydrogen embrittlement resistance in cryogenic tanks9.

• Quality Tests: Chemical analysis (spectroscopy/XRF), tensile testing (ASTM E8), hardness checks (ASTM E18), and surface roughness validation.

7. Industrial Applications

• Corrosion-Resistant Equipment: Chemical tanks, heat exchangers, dyeing machinery.

• Marine & Coastal: Ship fittings, desalination plants, offshore railing.

• Cryogenic Systems: Liquid hydrogen fuel tanks for ships (e.g., KRISO-POSCO collaboration).

• Precision Components: Watchcases, springs, fasteners, medical devices.