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GM ST21

IDENTIFICATION
GM ST-21, ERCoCr-E

CLASSIFICATION
AWS/SFA 5.21: ERCCoCr-E

DESCRIPTION
Cobalt base alloy mig wire providing excellent resistance to metal-to-metal wear, thermal shocks, oxidised corrosive environments at high temperatures.

CHEMICAL ANALYSIS (RANGE) %

C Mn Si Cr Ni Mo Fe Co
0.15 - 0.40 2.0 max 1.5 max 25 - 30 15 - 40 4.5 - 7.0 5.0 max Bal

TYPICAL APPLICATIONS

  • Extrusion dies, hot working tools, turbine injectors, valve seats, ingot tong bits.
  • Hardfacing of forging dies.

HARDNESS : 22 – 32 RC as deposited 38 – 40 Work hardened.

GENERAL CHARACTERISTICS

  • Microstructure : Austenitic matrix with dispersed precipitation of small Cr and Mo Carbides.
  • Machinability : Good
  • Deposit thickness : Depends upon application and procedure used.
  • Shielding gas : Pure argon or argon 98% + oxygen 2%

WELDING PARAMETER

Diameter (mm) Current intensity (A) Voltage (V) Stick-out (mm) Gas flow Weight / Spool (kg)
(1/mm)
1.2 110 - 180 20 -31 20 max Dec-15 12.5 / 15.0
1.6 150 - 250 20 - 31 20 max Dec-15 12.5 / 15.0
2.40 / 2.50 300 - 400 24 - 31 20 max 15 - 20 12.5 / 15.0