G-TECH 1010

SMAW
  • COBALT ALLOYS
Gr. 1

Description

Hardfacing electrode with rutile-basic coating
Rutile-basic coated electrode with good weldability and easy to remove slag. It is used for recharging parts of rolling mill guides, pump shafts, extrusion dies, etc. subjected to severe metal abrasion and very strong erosion, corrosion and cavitation. The deposit has a certain tendency to crack so preheating temperature of 300-450 °C is necessary and possibly a first pass with Gr.6 or Gr.12. It deposits Co-Cr-W alloy high in carbon for hardfacing resistant to wear and corrosion up to 900 ° C. It retains its hardness, 43–58 HRC, at temperatures up to 760°C. Only machinable by grinding.
Specifications
AWS A5.13
ECoCr-C
DIN 8555
E 20-UM-55-CTZ
Shielding
-
Positions
PA, PB, PC, PD, PF
Current
DC+
Packaging Type
Carton box
Asme qualifications
F-No (QW432)
71
A-No (QW442)
-

Hardness

52HRC - 54HRC
Chem. Comp. %
DEFAULT
C
2
Mn
0.5
Ni
1.8
Cr
32
Si
0.7
Fe
2.5
W
12.5
Mechanical Properties
min
variant
Tensile strength Rm MPa
-
240
Yield strength Rp0.2 MPa
0
170
Elongation A (L0=5d0) %
0
24
Impact Charpy ISO-V
-
-
Impact Charpy ISO-V
-
-
Welding Parameters
2.5 mm
3.2 mm
4 mm
Ampere
80A - 120A
100A - 140A
150A - 200A
Voltage
-
-
-
Packaging
pcs/kg
pcs/kg
pcs/kg
Packaging Type
Carton box
Carton box
Carton box
Anti-wear Characteristics
Adhesive wear
Abrasive wear
Corrosion
Heat
Gr. 1
Description

Application

The high percentage of carbides gives the alloy higher wear resistance accompanied by reductions in the impact and corrosion resistance. The higher hardness also means a greater tendency to check during cooling. The checking tendency may be minimized by closely monitoring preheating, interpass temperature, and postheating techniques. While the cobalt-chromium deposits soften somewhat at elevated temperatures, they normally are considered immune to tempering. Weld metal deposited by ERCoCr-C electrodes and rods is used to build-up items such as mixers, rotors, or wherever harsh abrasion and low impact are encountered. Suitable also for applications such as pump sleeves, rotary seal rings, wear pads, expeller screws and bearing sleeves. The addition of tungsten enhances high temperature hardness and matrix toughness for excellent adhesive and solid particle erosion wear resistance. It retains its hardness, 43–58 HRC, at temperatures up to 760°C. Preheat at 300°C and over in general.

Alloy Type

Cobalt alloy for hardfacing with excellent corrosion and abrasion resistance with low impact.

Microstructure

Primary hypereutectic carbides (approximately 19%) are found in in an austenitic type matrix.

Materials

It bonds well with all steels including stainless.

Welding & PWHT

Ensure thorough cleaning of both the joint surface and its adjacent area prior to welding, diligently removing any contaminants such as grease, oil, crayon marks, sulfur compounds, and other foreign matter. Exercise caution to avoid any contact between the joint area and copper or copper-bearing materials. While it is preferable, albeit not mandatory, for the alloy to be in a solution-annealed condition during welding, preheating is typically deemed unnecessary as long as the base metal temperature remains above 0°C. Throughout the welding process, maintain consistently low interpass temperatures for optimal results. For further enhancement, it is advisable to implement postheating at 600°C and facilitate a slow cooling process after welding to effectively prevent the occurrence of cracking.

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