Category » Cobalt Bare Rod

# 1 Bare

# 1 Bare rod has the highest hardness of the standard # cobalt alloys and is used in elevated temperature wear applications. It has a large volume of chromium carbides in a cobalt matrix giving the alloy excellent resistance to abrasion and solid particle erosion. It can be machined with difficulty using carbide tools or ground. It bonds well with stainless and other weldable grade steels.

Typical Deposit Analysis
C Ni Other Cr Fe Mn
2.3 3.0 max 0.50 max 30.0 3.0 max 1.0 max
Mo Si W Co    
1.0 max 2.0 max 13.0 Rem    
  • Specifications: AWS A5.21-2001
  • Classification: ERCoCr-C
Typical Deposit Characteristics
Abrasion Resistance Excellent

# 6 Bare

# 6 Bare rod provides resistance to many forms of chemical and mechanical degradation over a wide temperature range. It is the most versatile and widely used cobalt alloy, with a good balance of abrasion and impact resistance. Particular attributes of # 6 Bare are it's outstanding anti-galling properties, high temperature hardness and high resistance to cavitation erosion that results in its wide use as a valve seat material. It bonds well to all weldable grade steels and stainless.

Typical Deposit Analysis
C Ni Other Cr Fe Mn
1.1 3.0 max 0.50 max 28.0 3.0 max 1.0 max
Mo Si W Co    
1.0 max 2.0 max 4.7 Rem    
  • Specifications: AWS A5.21-2001
  • Classification: ERCoCr-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 Bare

# 12 Bare rod is slightly harder than # 6 Bare rod with better abbrasive and metal-to-metal wear resistance. It produces a high hardness cobalt-chromium deposit. The 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 0.50 max 29.0 3.0 max 1.0 max
Mo Si W Co    
1.0 max 2.0 max 8.0 Rem    
  • Specifications: AWS A5.21-2001
  • Classification: ERCoCr-B
Typical Deposit Characteristics
Abrasion Resistance Excellent
Impact Resistance Good
Corrosion Resistance Good
Hardness HRC 44 - 50
Hot Hardness Excellent

# 21 Bare

# 21 Bare rod deposits a low carbon austenitic cobalt type alloy with excellent work hardenability, 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 2100? F. Resistance to galling (self-mated) corrosion and cavitation erosion make # 21 Bare is 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 0.50 max 27.0 3.0 max 1.5 max
Mo Si W Co    
5.0 1.5 max 0.5 max Rem    
  • Specifications: AWS A5.21-2001
  • Classification: ERCoCr-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