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NHF-6700 (low hydro)
AWS Specification: NONE
JIS Specification:

NONE

Other Specification:

DIN 8555 E6-60 coated

I. APPLICATIONS: 

 

This electrode can be used for single and multi pass hardfacings. With multi-pass welding, it is advisable to deposit interpasses with NHF-CrMn or NHF-630. The full hardness is then attained in the third pass. For hardfacing on low alloy steels, preheating to 480-570 deg F or 250-300 deg C is recommended. Cooling after welding should proceed slowly, in an oven or under insulation. If peak hardnesses of 60 Rockwell C are to be obtained, hardening is accomplished by quenching in oil at 1920 deg F (1050 deg C). If machining is necessary softening must be induced by annealing 5 hours at 1470 def F (800 deg C).

II. DESCRIPTIONS:

NHF-6700 is used for hardfacing workpieces exposed to abrasion accompanied by impact stressing. The base metal may be steel, cast steel or hard manganese steel. Special applications are surfacings on die blocks, pressing, drawing and cold pressing tools, excavator parts, shear blades, slideways and guide rails. NHF-6700 has good weldability in the horizontal position. Good slag removal and smooth seams.

III. TYPICAL CHEMICAL COMPOSITION OF WELD METAL (%)

C

Si

Mn

Cr

0.50

2.30

0.40

9.00

 IV. HARDNESS OF WELD METAL:

 Pure weld metal deposit : 56-58 HRC

After soft annealing: 780-820 deg C in oven 25 HRC

After hardening : 1000-1050 deg C in oil 60 HRC

1 later on hign Mn-steel : 22 HRC

2 laters on high Mn-steel : 40 HRC

V. WELDING POSITIONS: FLAT, HORIZONTAL VERTICAL, VERTICAL UP, HORIZONTALL

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

Size

Dia.

3.2

4.0

5.0

(mm)

Length

350

350

350

Current Range

100-140

140-180

180-210

 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.