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NHF-73G2
AWS Specification: NONE
JIS Specification:

NONE

Other Specification:

DIN 8555 E3-UM-55-ST

I. APPLICATIONS:

On the strength of its great hardness, toughness and high-tempearture resistance, NHF-73G2 is employed for surfacing on machine components and tools exposed to abrasion and compression with moderate impact loads and operating temperatures up to 930ºF (550ºC).  These include dead centers, tongs, slide-and guideways, hot and cold cut-off attachments, valves, slides, hot shear blades, extrusion press pistons, dies, strippers, deburrers, sheet punching tools.

NHF-73G2 is also used to good advantage for the economic manufacture of cold and hot working tools.  In such cases the carrier steel must have a tensile strength of more than 158,000 psi (1100N/mm2) is used as parent metal for the tool.

II. DESCRIPTION:

Low-hydrogen electrode for high-temperature resistant surfacings on hot work steels exposed to impact, compression and abrasion.

     III. NOTES ON USAGE:

Bigger workpieces must be preheated to 750-1110ºF (400-600ºC) and kept at this temperature during welding.

A lower preheat temperature is enough for smaller work, because it is heated adequately by the arc. Certain jobs on smaller workpieces may even be welded without preheating. The depth of the build-up may amount to 15mm max.

Slowly cool in an oven or under asbestos after welding. The weld can be machined only by grinding after it cools. If other cutting operations have to be performed on a build-up weld, annealing is necessary.

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

 

C

Si

Mn

Cr

Mo

0.35

0.55

1.35

7.10

2.55

V. HARDNESS OF ALL WELD METAL DEPOSIT:

As welded                       55-58 HRC (600-650 Hv)

Soft annealed                  about 25 HRC

Hardened                         64-66 HRC

VI. WELDING POSITIONS: FLAT, FILLET, 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)

80 - 110

100 - 140

130 - 170

 TEST RESULT

The information contained or otherwise referenced herein is presented only as “typical” without guarantee or warranty, and Industrial Welding Corporation expressly disclaims any liability incurred from any reliance thereon. Typical data and Test results for mechanical properties, deposit or electrode composition and other properties were obtained from a weld produced and tested according to prescribed standards, and should not be assumed to be the expected results in a particular application or weldment. Actual results will vary depending on many factors, including, but not limited to, weld procedure, plate chemistry and temperature, weldment design and fabrication methods. Users are cautioned to confirm by qualification testing, or other appropriate means, the suitability of any welding consumable and procedure before use in the intended application.