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NHF-73G4 (low hydro)
AWS Specification: NONE
JIS Specification:

NONE

Other Specification:

DIN 8555 E3-UM-40-PT

I. APPLICATIONS:

On the strength of its toughness, toughness and high-temperature resistance, NHF-73G4 is employed for surfacing on machine components exposed to impact, compression and abrasion at operating temperatures up to 1020ºF(550ºC). Accordingly, NHF-73G4 is particularly suited for building-up dies. It can also be used to good effect for surfacing rollers, drive clover leaves, hot shear blades etc.

NHF-73G4 is also employed for the economic manufacture or these workpieces. As parent metal a carrier steel with tensile strength in excess of 144,000 psi (1,000 N/mm2) is recommended.

II. DESCRIPTION:

Low-hydrogen electrode for high-temperature resistant surfacings exposed to compression and abrasion. The deposit is machinable.

III. NOTES ON USAGE:

Preheat the workpiece to 480 - 570ºF (250 –300ºC). Guide the electrode as vertically as possible, with medium-long arc. Let the workpiece cool slowly under asbestos. Finish by grinding.

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

 

C

Si

Mn

Cr

Mo

0.17

0.54

0.62

6.50

3.60

V. HARDNESS OF WELD METAL:

38-42 HRC (310-410 Hv)

High-temperature resistant up to 1020ºF (550ºC)

VI. WELDING POSITIONS: FLAT, FILLET, VERTICAL UP

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

 

Size

Dia.

3.2

4.0

5.0

(mm)

Length

350

350

350

Current Range

80-130

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.