Plaque d'acier plaquée
Hardfacing plates are a type of clad steel because they consist of two metallurgically bonded layers avec different compositions and functions.
Le base layer fournit une résistance structurelle, tandis que le carbide-rich overlay layer provides exceptional resistance to wear and heat.
This composite structure is the essence of clad steel technology—delivering the performance of multiple materials in a single, durable plate.
- Description
UN Plaque d'acier plaquée refers to a plaque d'acier composite made by bonding two or more layers of metal materials with different properties.
The purpose of cladding is to combine the résistance et ténacité de l'acier de base avec le special surface properties—such as wear resistance, résistance à la corrosion, or heat resistance—of the cladding layer.
One of the most common examples of clad steel in industrial applications is the hardfacing or overlay plate, often known as a Carbide or Chromium Carbide Overlay (Chef de la conformité) Plaque.
1. Definition of Clad Steel Plate
| Composant | Description | Fonction |
|---|---|---|
| Assiette de base | Usually made of carbon steel, low alloy steel, or stainless steel | Fournit une résistance structurelle, dureté, et soudabilité |
| Bardage / Calque de superposition | Made of wear-resistant or corrosion-resistant alloy (such as chromium carbide, nickel, or stainless alloy) | Provides protection against wear, corrosion, and heat |
| Bonding Interface | Metallurgical fusion zone created during welding or explosion bonding | Ensures strong and permanent adhesion between layers |
The combination of these layers forms a metallurgically bonded composite plate—which is why a plaque de rechargement is also considered a clad steel plate.
2. Why Hardfacing Plates Are a Type of Clad Steel
(1) Two-Layer Composite Structure
Hardfacing plates consist of a métal commun (substrate) et un welded overlay layer.
The overlay—typically a chromium carbide alloy—is lié métallurgiquement to the steel substrate.
This dual-layer structure is the defining feature of clad steel.
(2) Different Functional Purposes
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Le base plate provides mechanical strength, allowing the plate to withstand bending, impact, or vibration.
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Le couche de superposition provides surface protection against abrasion, érosion, or high temperatures.
The combination allows the plate to maintain both mechanical integrity et surface durability, similar to other cladding technologies like stainless-clad plates ou nickel-clad plates.
(3) Permanent Bonding (Metallurgical Fusion)
Unlike coatings or painting, the overlay in a hardfacing plate is not just attached mechanically—it’s fused at the atomic level through welding.
This metallurgical bond ensures the cladding layer does not peel off even under extreme wear or thermal stress.
(4) Composite Performance
The result is a steel plate that behaves as a single integrated material, but with dual performance zones:
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Tough and ductile base layer
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Ultra-hard and wear-resistant couche superficielle
This is precisely the engineering principle behind clad steel design.
3. Typical Structure of a Hardfacing (Clad) Plaque
| Couche | Typical Material | Fonction | Dureté |
|---|---|---|---|
| Recouvrir / Cladding Layer | Fe-Cr-C (Carbure de chrome), Fe–Cr–Nb–Mo–C (Complex Carbide) | Provides wear and heat resistance | 58–65 HRC |
| Zone de transition | Fusion boundary | Bonds overlay and base plate | — |
| Assiette de base | Acier doux (Q235, A36), low alloy steel (Q345), or stainless steel | Provides strength and weldability | 160–220 HB |
4. Comparaison: Clad Steel vs Regular Steel
| Propriété | Regular Steel Plate | Clad (Rechargement) Plaque d'acier |
|---|---|---|
| Structure | Single metal layer | Two-layer composite (base + recouvrir) |
| Dureté | 150–300 HB | 600–750 HV (≈ 58–65 HRC) |
| Résistance à l'usure | Faible | Très élevé |
| Corrosion / Résistance à la chaleur | Limité | Haut (depending on overlay alloy) |
| Durée de vie | Court | 5–20× plus long |
| Rentabilité | Lower initially | Higher long-term value |
5. Types of Cladding Methods
There are several ways to manufacture clad steel, depending on the type of service required:
| Cladding Method | Description | Utilisation typique |
|---|---|---|
| Welding Overlay (Rechargement) | A molten alloy is welded onto the base plate surface | Wear-resistant plates (Carbide Plates) |
| Explosion Cladding | Plates bonded using controlled explosive force | Corrosion-resistant stainless clad plates |
| Roll Bonding / Hot Pressing | High pressure and temperature diffusion bonding | Large pressure vessel plates |
| Revêtement laser / PTA | Thin, precise overlay using laser or plasma | Tooling, aérospatial, and valve components |
Parmi ceux-ci, welding overlay is the most common for plaques d'usure en carbure, as it provides high hardness and strong fusion at an economical cost.
6. Applications of Hardfaced Clad Plates
Because of their composite design, clad wear plates are widely used in industries exposed to abrasion, impact, and heat:
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Mines et carrières – chutes, trémies, concasseurs, écrans
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Industrie du ciment – clinker coolers, cyclones, convoyeurs
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Centrales électriques – coal feeders, canalisations de cendres, pales de ventilateur
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Aciéries – sinter plant liners, goulottes de transfert
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Engins de chantier – loader buckets, lames de bulldozer, mixing arms
Leur dual-layer composition makes them the ideal solution for extending equipment life and reducing maintenance frequency.
7. Résumé
| Fonctionnalité | Plaque d'acier plaquée (Rechargement) |
|---|---|
| Structure | Plaque de base + metallurgically bonded overlay |
| Matériau de superposition | Carbure de chrome, carbure complexe, or alloy layer |
| Dureté | 58–65 HRC |
| Bond Type | Metallurgical fusion |
| Fonction | Combines toughness and surface protection |
| Secteurs | Exploitation minière, ciment, pouvoir, acier, construction |
