language

Home

Products

Cr7c3 Carbide Content

Cr₇C₃ carbide is a critical strengthening phase in chromium-based wear-resistant materials. Its high hardness and excellent abrasion resistance make it the primary contributor to the performance of chromium carbide overlay plates. When properly controlled and distributed within the weld matrix, Cr₇C₃ significantly enhances wear life while maintaining acceptable structural stability in industrial applications.

Keywords:

Cr7c3 Carbide Content

Category:

Hardfacing Wear-resistant Plate

Inquiry Now

Send E-mail

File Download

sales1@tedaganghua.com

+86 22 86896631、+86 15822676888

Product Details

Cr₇C₃ (Chromium Carbide) is one of the most important hard phases formed in chromium-based wear-resistant materials such as Chromium Carbide Overlay (CCO) plates and hardfacing wear plates. It plays a key role in determining hardness, abrasion resistance, and service life of the material.

In industrial wear systems, the content and distribution of Cr₇C₃ directly influence the overall performance of the overlay layer.

What is Cr₇C₃ Carbide

Cr₇C₃ is a chromium-rich carbide compound formed during the solidification of weld overlay materials containing high chromium and carbon.

Chemical formula: Cr₇C₃
Structure: Hard ceramic-like phase embedded in metallic matrix
Formation: Occurs during welding or solidification of chromium-rich alloys

It is one of the primary strengthening phases in wear-resistant overlays.

Formation Mechanism

Cr₇C₃ is formed when chromium and carbon react under high-temperature welding conditions:

Chromium (Cr) combines with Carbon (C)
Controlled cooling allows carbide precipitation
Carbides are distributed within the iron-based matrix

The amount and morphology of Cr₇C₃ depend on:

Chromium content in alloy
Carbon concentration
Cooling rate during welding
Welding process parameters

Chemical Composition Role in Wear Layers

In chromium carbide overlay systems, typical alloy composition supporting Cr₇C₃ formation includes:

Element	Typical Range (%)	Function
Chromium (Cr)	20–35	Main carbide former
Carbon (C)	3–5	Essential for carbide formation
Iron (Fe)	Balance	Matrix material
Manganese (Mn)	Small amount	Improves toughness
Silicon (Si)	Small amount	Stabilizes welding process

Performance Characteristics of Cr₇C₃ Carbide

1. Extremely High Hardness

Cr₇C₃ is a ceramic-like phase with very high microhardness:

Much harder than steel matrix
Major contributor to surface hardness (55–65 HRC range in overlays)

2. Excellent Abrasion Resistance

Cr₇C₃ particles resist:

Sliding wear
Particle erosion
Grinding and cutting action

This makes it ideal for severe wear environments.

3. Brittle but Strong in Matrix Support

While Cr₇C₃ itself is brittle, it is supported by a ductile metallic matrix:

Carbides provide hardness
Matrix provides toughness
Combined structure ensures balanced performance

4. Wear Resistance Mechanism

The wear resistance of Cr₇C₃ is based on:

Hard particle barrier effect
Resistance to material penetration
Reduction of surface deformation

Distribution in Weld Overlay

In chromium carbide overlay plates, Cr₇C₃ is typically:

Uniformly distributed in the overlay layer
Formed as elongated or blocky carbide structures
Embedded in iron-based matrix
Aligned depending on welding direction and cooling rate

A uniform distribution improves wear consistency across the surface.

Comparison with Other Carbides

Carbide Type	Hardness	Toughness	Wear Performance
Cr₇C₃	Very High	Low–Medium	Excellent
Cr₂₃C₆	Medium	Medium	Good
WC (Tungsten Carbide)	Extremely High	Low	Extremely High