スチール用の耐摩耗性コーティング

鋼用の耐摩耗性コーティング are engineered surface layers applied to improve abrasion resistance, erosion resistance, and service life of steel components. Instead of replacing entire structural parts with high-hardness materials, coating technology allows manufacturers to enhance surface performance while maintaining core strength and weldability.

These coatings are widely used in mining, セメント, 発電, 鉄鋼生産, バルクマテリアルハンドリング産業.

1. 硬化肉盛溶接 (Overlay Welding Process)

Hardfacing is one of the most common manufacturing methods for producing wear resistant coatings.

プロセス原理:

A high-alloy welding wire or flux-cored wire is deposited onto a mild steel base plate using arc welding processes. The deposited layer contains high chromium carbides or complex alloy carbides that provide superior hardness.

Common Welding Methods:

• サブマージアーク溶接 (見た)

• オープンアーク溶接 (OAW)

• Gas Metal Arc Welding (GMAW)

• フラックス入りアーク溶接 (FCAW)

特徴:

• Surface hardness: typically 55–65 HRC

• Strong metallurgical bond between coating and base steel

• Suitable for large surface areas

• Customizable overlay thickness (3–20 mm or more)

アプリケーション:

• シュートライナー

• Crusher components

• Fan blades

• Cement mill liners

Hardfacing creates a composite wear plate with both structural strength and extreme abrasion resistance.

2. 溶射塗装

Thermal spraying applies molten or semi-molten materials onto a prepared steel surface.

Common Thermal Spray Technologies:

• プラズマ溶射

• 高速酸素燃料 (HVOF)

• Flame spraying

• Arc spraying

Process Steps:

1. Surface preparation (grit blasting for roughness)

2. Heating and accelerating coating material

3. Spraying onto substrate

4. Cooling and finishing treatment

利点:

• Minimal heat input compared to welding

• Low distortion of base metal

• Suitable for precision components

• Excellent resistance to abrasive and erosive wear

This method is widely used for shafts, ローラー, pump parts, and rotating equipment.

3. レーザークラッディング

Laser cladding is an advanced surface engineering technology.

Process Description:

A high-energy laser beam melts alloy powder together with a thin layer of the steel substrate, forming a dense metallurgical bond.

特徴:

• Precise heat control

• Minimal dilution rate

• Low deformation

• Fine microstructure

• Excellent bonding strength

Laser cladding allows accurate control of coating thickness and is suitable for high-value components requiring precision wear resistance.

4. Chromium Carbide Overlay Plate Manufacturing

Chromium carbide overlay (CCO) plates are produced through automated welding systems.

製造工程:

• Base plate preparation

• Automated multi-layer weld deposition

• Controlled cooling

• Surface finishing and flattening

The overlay layer contains hard chromium carbides distributed in a martensitic matrix, providing outstanding sliding abrasion resistance.

These plates are commonly fabricated into:

• ホッパーライナー

• コンベヤライナー

• Pipe linings

• Industrial wear panels

5. PTA (Plasma Transferred Arc) 溶接

PTA welding is a precision hardfacing method used for high-performance coatings.

Process Benefits:

• Low dilution

• Strong metallurgical bonding

• Uniform coating structure

• 優れた耐摩耗性と耐腐食性

PTA is commonly applied to:

• Valve seats

• Extruder screws

• Rollers

• Heavy-duty industrial tools

6. Surface Preparation and Quality Control

Regardless of coating method, proper surface preparation is essential:

• Degreasing

• Sandblasting or shot blasting

• Removal of oxides and contaminants

Quality inspection typically includes:

• 硬さ試験 (HRC or HV)

• Coating thickness measurement

• Ultrasonic testing for bonding integrity

• Visual inspection for cracks or defects

Proper process control ensures durability and consistent coating performance.

7. Selection of Coating Process

Choosing the correct wear resistant coating depends on:

• 摩耗の種類 (スライディング, インパクト, 侵食, または組み合わせた)

• 動作温度

• Required hardness level

• Component geometry

• Budget and production scale

General guidance:

• Large flat structures → Overlay welding

• Precision components → Laser cladding or HVOF

• Severe sliding abrasion → Chromium carbide overlays

• インパクト + abrasion → Alloy hardfacing systems