Description
Global Compliance & Surface Finish Standards
| Region | Material Standard | Finish Specification |
|---|
| USA | ASTM A314 | AMS 2700 (Electrochemical Polish) |
| Europe | EN 10088-2 | DIN 50939 (Black Oxide Coating) |
| Japan | JIS G4303 | SUS 321-BP (Class 4 Reflectivity) |
| International | ISO 9444 | Ra ≤0.2μm (Post-Polish Roughness) |
Material Innovation
Core Alloy Attributes
Titanium Stabilization: Ti ≥5×C% prevents intergranular corrosion, even after prolonged exposure to 800°C.
Black Oxide Layer: 3–5μm thickness via controlled electrochemical oxidation, enhancing scratch resistance and light absorption.
Enhanced Surface Properties
Gloss Level: 85–95 GU (Gloss Units) at 60° angle.
Adhesion Strength: 15 MPa (Per ASTM D3359 Crosshatch Test).
UV Stability: ΔE <1.5 after 1.000 hrs Xenon arc testing (ASTM G155).
Technical Superiority
| Category | Performance | Benchmark |
|---|
| Corrosion Resistance | 1.500 hrs neutral salt spray (ASTM B117) | 10x better than normal coating |
| Thermal Cycling | 500 cycles (200°C ↔ 800°C) without finish delamination |
|
| Load Capacity | 600 MPa tensile strength (cold-drawn) |
|
| Hygienic Compliance | FDA 21 CFR 175.300 (Indirect food contact) |
|
5 Market-Differentiating Features
Stealth-Grade Aesthetics
Matte-black finish minimizes glare in optical/laser systems while meeting MIL-STD-3009 low-reflectivity criteria.
Biofilm Resistance
Nano-textured surface inhibits bacterial adhesion (ISO 22196: >99% reduction vs. unpolished 321).
Zero Maintenance Appeal
Self-healing oxide layer regenerates in oxygen-rich environments, eliminating repainting needs.
Thermal-Emissivity Control
Black finish enhances radiative heat dissipation (ε=0.85 at 500°C per ASTM E903).
Circular Economy Ready
100% reclaimable via alkali stripping; achieves Cradle-to-Cradle Bronze certification.
Cross-Industry Applications
| Sector | Innovative Use Cases |
|---|
| Luxury Architecture | Facade cladding, avant-garde sculptures |
| Semiconductor | Vacuum chamber components, black-body radiators |
| Automotive | High-end exhaust tips, heat-shielded trim |
| Consumer Tech | Wearable device frames, premium audio hardware |
| Energy | Solar absorber tubes, geothermal sensor housings |
Procurement & Application FAQs
Q1: How does black polishing affect 321’s heat resistance?
A: The oxide layer amplifies thermal emissivity, improving heat dissipation without compromising base alloy integrity up to 800°C.
Q2: Can the finish withstand chemical cleaning?
A: Yes—resists pH 2–12 solutions. Use non-abrasive cleaners to preserve gloss.
Q3: Is onsite welding feasible?
A: Yes, but use argon shielding to prevent finish oxidation. Post-weld local polishing kits available.
Collaboration Incentives
Certified Precision
TUV-certified dimensional tolerances: ±0.03mm (≤50mm Ø), ±0.05mm (>50mm Ø).
Custom Solutions
Lengths: 0.5m–12m | Anti-fingerprint coatings | RFID traceability tagging.
Logistics Network
Air-freight priority from Dubai/Singapore hubs; damage-proof crating with desiccant.
Keywords: 321 Black Polished Round Bar, Titanium-Stabilized Aesthetic Steel, Architectural-Grade Stainless, Low-Reflectivity Metal, Luxury Finish Alloy
