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NHF-7200
AWS Specification: E FeMn-A
JIS Specification:

NONE

Other Specification:

DIN 8555 E7-250KP

                              

I. APPLICATIONS:

The main application areas are the building industry, quarries and mines for surfacing worn high Mn steel parts e.g. excavator pins, buckets and teeth, mill hammers, crusher jaws, cones and beaters, impeller bars, railway building machinery, shunts, heart and cross pieces.

II. DESCRIPTION:

NHF-7200 is predominantly suited for tough and crack resistant joinings and surfacings on parts of high Mn-steel subject to extreme impact, compression and shock. Buildups on C-steel are also possible. The High Mn-content produces a fully austenitic deposit. The deposit is highly workhardening and hardens during service from originally 200-250 HB to 450 HB. Machining is possible with tungstene carbide tools 

III. NOTES ON USAGE:

Hold electrode as vertically as possible. Welding should be done at low temperature. Interpass temperature should not exceed 250° C. It is therefore recommended to weld short beads and to allow for continuous cooling during welding or to place the workpiece in a cold water bath with only the welding area sticking out of water.

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

 

C

Si

Mn

Cr

Mo

Ni

0.70

0.27

13.00

4.50

0.53

4.00

V. HARDNESS OF WELD METAL:

Hardness,as welded, 3 layers weld metal     95 - 100 HRB (220 – 260 Hv)

work hardened                   43 – 45 HRC (420 – 450 Hv)

VI. WELDING POSITIONS: FLAT, VERTICAL UP, OVERHEAD

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

 

Electrodes

Ø mm x L

3.2 x 350

4.0 x 350

5.0 x 350

Amperage

A

110-140

150-180

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.