When sourcing industrial blades on Alibaba.com, sellers encounter three primary surface treatment configurations: heat treated, coated, and polished. Each treatment serves distinct purposes and appeals to different buyer segments. Understanding these options is critical for Southeast Asian exporters looking to position their products effectively in global B2B markets.
Heat treatment involves controlled heating and cooling of metal to alter its microstructure, improving hardness, toughness, and wear resistance. This is considered a foundational treatment—most quality blades undergo some form of heat treatment regardless of additional surface finishes. The process typically includes austenitizing (heating to 1000-1100°C), quenching (rapid cooling), and tempering (reheating to 150-400°C to reduce brittleness) [5].
Coated blades feature thin film applications such as Titanium Nitride (TiN), Titanium Carbonitride (TiCN), Diamond-Like Carbon (DLC), or PTFE. These coatings provide additional benefits beyond the base metal properties: enhanced hardness (TiN reaches 85RC), reduced friction, corrosion resistance, and in some cases, non-stick properties for food processing applications [2].
Polished blades undergo mechanical or electrochemical finishing to achieve smooth surfaces, often measured in Ra (roughness average) values. Polishing serves both aesthetic and functional purposes—reducing friction, preventing material buildup, and meeting hygiene standards for food and medical applications. Mirror finishes (Ra < 0.1μm) command premium pricing but require specialized equipment [2].
Surface Treatment Comparison: Technical Specifications
| Treatment Type | Hardness Range | Primary Benefits | Typical Cost Premium | Common Applications |
|---|---|---|---|---|
| Heat Treated Only | 55-62 HRC | Core hardness, toughness, edge retention | Base price (no premium) | General purpose cutting, woodworking, packaging |
| TiN Coated | Up to 85RC surface | Wear resistance, golden appearance, reduced friction | +20-35% | Metal cutting, abrasive materials, high-volume production |
| TiCN Coated | 80-84RC surface | 3-10x longer life vs uncoated, corrosion resistance | +30-50% | Food processing, packaging, corrosive environments |
| DLC Coated | Up to 80RC surface | Extreme hardness, biocompatible, black finish | +40-60% | Medical devices, precision cutting, premium consumer products |
| Polished (Mirror) | N/A (surface finish) | Hygiene, non-stick, aesthetic appeal | +15-25% | Food grade, medical, cleanroom applications |
| PTFE Coated | N/A (non-stick) | Material release, easy cleaning | +25-40% | Adhesive cutting, sticky materials, food processing |
