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NHF-HMn
NHF-HMn
AWS Specification: EFeMn-B
JIS Specification:

NONE

Other Specification:

 

 

 

I. APPLICATIONS:

Rebuilding of HADFIELD steel rail ends, shovel, dredge buckets, heavy crushing equipment, like the jaw crusher, gyratory crusher cones, mantles, swing hammer, tooth crusher rolls, ore crusher crown wheels, and many more.. 

II. DESCRIPTION:

 A HADFIELD TYPE 14 % manganese for austenitic, non-magnetic weld metal suitable for joining and rebuilding components of the same type, subject to abrasion service with impact. Prior to weld thick rebuilding deposits over HADFIELD STEEL, it is necessary to “buffer” first the base metal with one of two layers of an austenitic stainless steel.

     III. NOTES ON USAGE:

  • Avoid the continous welding and it is recommended to water cooling during welding.

  • It is necessary to underlay with austenitic stainless steel in such case when the base metal is not 13% manganese steel.

  • When the base metal of 13% manganese steel is hardened, remove it before welding.

  • Dry the electrodes at 150 - 200ºC for 30 – 60 minutes before use.

IV. TYPICAL CHEMICAL COMPOSITION OF WELD METAL (%):

 

C

Si

Mn

Cr

Mo

0.88

0.33

14.20

-

-

V. HARDNESS OF WELD METAL: 

Hardness, as welded, 3 layers weld metal  87-100 HRB (180 – 220 Hv)

work hardened                                             45 – 51 HRC (450 – 530 Hv)

VI. WELDING POSITIONS: FLAT, OVERHEAD, VERTICAL UP

VII.SIZES AVAILABLE AND RECOMMENDED CURRENTS (AC or DC + ):

 

Size (dia. mm)

3.2

4.0

5.0

Length (mm)

350

350

350

Current Range (Amp)

90 - 130

120 - 180

170 - 230