Category » Cobalt Alloys » Cobalt Coated Electrode

# 1 Coated

# 1 Coated is the highest hardness standard cobalt alloy in the group of cobalt alloys used for elevated temperature abrasive wear associated with corrosion. Deposits of this alloy have a large volume of chromium carbides that impart outstanding abrasive wear resistance. The addition of tungsten enhances high temperature hardness and matrix toughness for excellent adhesive and solid particle erosion wear resistance. It bonds well with all steels including stainless.

Typical Deposit Analysis
C Ni Other Cr Fe Mn
2.1 3.0 max 1.0 max 29.6 5.0 max 2.0 max
Mo Si W Co    
1.0 max 2.0 max 12.1 Rem    
  • Specifications: AWS 5.13, ASME SFA 5.13
  • Classification: ECoCr-C
Typical Deposit Characteristics
Abrasion Resistance Excellent
Impact Resistance Fair
Corrosion Resistance Good
Hardness HRC 48 - 56
Hot Hardness Very Good

# 6 Coated

# 6 Coated electrodes produce a medium hardness cobalt-chromium deposit for high temperature applications with good abrasive wear and good impact resistance. # 6 Coated is the most versatile and widely used cobalt alloy with a good balance of abrasion and impact resistance. Chromium carbides contained in the deposit have excellent resistance to many forms of chemical and mechanical degradation, including galling and cavitation erosion. It bonds well with all weldable steels, including stainless.

Typical Deposit Analysis
C Ni Other Cr Fe Mn
1.1 3.0 max 1.0 max 28.8 5.0 max 2.0 max
Mo Si W Co    
1.0 max 2.0 max 5.0 Rem    
  • Specifications: AWS 5.13, ASME SFA 5.13
  • Classification: ECoCr-A
Typical Deposit Characteristics
Abrasion Resistance Very Good
Impact Resistance Very Good
Corrosion Resistance Good
Hardness HRC 38 - 46
Hot Hardness up to 1200?F

# 12 Coated

# 12 Coated electrodes produce a high hardness cobalt-chromium deposit for high temperature applications with good abrasive wear associated with corrosion. It is similar to the # 6 coated electrode except for a slightly higher carbide content. Chromium carbides contained in the deposit provide excellent resistance to many forms of chemical and mechanical degradation, including galling. It bonds well with all weldable steels, including stainless.

Typical Deposit Analysis
C Ni Other Cr Fe Mn
1.4 3.0 max 1.0 max 28.8 5.0 max 2.0 max
Mo Si W Co    
1.0 max 2.0 max 8.5 Rem    
  • Specifications: AWS 5.13, ASME SFA 5.13
  • Classification: ECoCr-B
Typical Deposit Characteristics
Abrasion Resistance Excellent
Impact Resistance Good
Corrosion Resistance Good
Hardness HRC 44 - 50
Hot Hardness Excellent

# 21 Coated

# 21 Coated electrodes deposit a low carbon austenitic type cobalt alloy with excellent work hardenable high temperature strength and impact resistance. These deposits are quite stable during thermal cycling, making them a favorite for hot die materials. They have good strength and ductility in temperatures up to 1600? F. Resistance to galling (self-mating), corrosion, and cavitation erosion make # 21 Coated a good choice for valve trim on steam and fluid control valve bodies and seats. It bonds well to all weldable steels, including stainless.

Typical Deposit Analysis
C Ni Other Cr Fe Mn
0.3 2.5 1.0 max 27.0 5.0 max 1.5 max
Mo Si W Co    
5.2 1.5 max 0.50 max Rem    
  • Specifications: AWS 5.13, ASME SFA 5.13
  • Classification: ECoCr-E
Typical Deposit Characteristics
Abrasion Resistance Fair
Impact Resistance Excellent
Corrosion Resistance Good
Hot Hardness Excellent
Hardness (2 Layers) HRC 22 - 26
Hardness: Work Hardened HRC 40 - 45