Rugged Stainless Steel Coil – Polished 316

Rugged Stainless Steel Coil – Polished 316

Overview

Polished 316 Stainless Steel Coil is an austenitic, molybdenum-enhanced (2–3%) alloy renowned for supreme corrosion resistance in aggressive environments like marine, chemical, and pharmaceutical industries. Its polished surface (Ra ≤0.05µm) minimizes friction and microbial adhesion, making it ideal for hygienic applications and structural components exposed to salt, acids, or chlorides.

Technical Specifications

Table 1: Chemical Composition (ASTM A240)

Table 2: Mechanical Properties

Table 3: Physical Properties

Table 4: Size & Tolerance

Table 5: Processing Capabilities

Detailed Properties & Performance

1. Tensile Strength and Bendability

Polished 316 coils deliver minimum tensile strength of 485 MPa, ensuring structural integrity in high-pressure applications like chemical reactors or offshore platforms. The alloy’s elongation (≥40%) supports deep drawing and tight bending (radius ≤1.5× thickness) without fracture. Post-bend annealing (1050°C) restores corrosion resistance if work hardening occurs during forming of custom stainless steel coil geometries.

2. Bending and Formability

The austenitic microstructure provides exceptional ductility, enabling 180° bends for complex fabrications like heat exchanger housings. Polished surfaces reduce friction during bending, minimizing micro-crack initiation. For large stainless steel coil installations (>10 MT), stress-relief annealing is recommended to prevent distortion.

3. Identification & Certification

Each coil includes:

• Laser-etched grade markings (e.g., "316-P" for Polished) near the inner diameter.
• Mill Test Certificate (EN 10204 3.1) validating compliance with ASTM A240, EN 10088-2, and JIS G4303.
• Third-party validation (SGS, TÜV) for critical sectors like pharmaceuticals or marine engineering.

4. Weight Calculation

Calculate coil mass using:
Weight (kg) = Thickness (mm) × Width (mm) × Length (m) × Density (8.0) ÷ 1000
Example: A large stainless steel coil of 3.0mm × 1500mm × 1000m weighs ≈36,000 kg (±2% tolerance). Custom formulas adjust for non-standard coil range stainless steel dimensions.

5. Corrosion Resistance & Rust Prevention

Molybdenum enhances pitting/crevice corrosion resistance in chloride-rich environments (e.g., seawater with >500 ppm Cl⁻). Rust occurs only under extreme conditions:

• Thermal Damage: Carbide precipitation at 427–857°C reduces intergranular corrosion resistance.
• Galvanic Corrosion: Contact with carbon steel or copper in humid/electrolyte-rich settings.
• Surface Contamination: Iron particles or grease disrupt the passive chromium oxide layer.
  Preventive measures include:
• Electropolishing: Enhances passive layer uniformity for coastal custom stainless steel coil applications.
• Regular Cleaning: Neutral pH solutions (e.g., 10% nitric acid) remove chlorides without damaging polish.

Applications

• Chemical Processing: Reactor linings, pipework (resists sulfuric/phosphoric acids).
• Marine Architecture: Ship hulls, offshore platforms (immune to saltwater pitting).
• Medical & Food: Surgical trays, fermenters (polish prevents bacterial adhesion).
• Energy: Heat exchanger tubing (creep resistance ≤870°C).

Why Choose Our Polished 316 Stainless Steel Coils?

1. Zero-Defect Polish: Mirror finishes achieve ≤0.05µm Ra via triple-stage mechanical/electrolytic polishing.
2. Global Compliance: Certified to ASTM A240, PED 2014/68/EU, and ASME Sec. VIII for pressure vessels.
3. Customization Excellence: Slitting, annealing, and edge-milling for custom stainless steel coil orders (MOQ: 1 ton).
4. Rapid Logistics: 15-day delivery for large stainless steel coil orders (≤20 MT) worldwide.
5. Lifetime Warranty: 15-year guarantee against pitting and crevice corrosion in ISO 9223 C3-CX environments.