NHF-7200

Specification

AWS Specification: AWS A5.13 EFeMn-A
JIS Specification: N/A
Other Specification: DIN 8555: E7-UM-250-KP

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
High Mn-content produces a fully austenitic deposit
Weld metal deposit is highly workhardening and hardens during service from originally 200-250 HB to 450 HB
Machining is possible with tungstene carbide tools

Application

Building industry
Quarries and mines for surfacing worn high Mn steel parts, such as excavator pins, buckets and teeth, mill hammers, crusher jaws, cones and beaters, impeller bars, railway building machinery, shunts, heart and cross pieces

Remarks

Hold electrode as vertically as possible

Welding should be done at low temperature

Interpass temperature should not exceed 250� C

Recommend 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 the water

Technical Data

TYPICAL CHEMICAL COMPOSITION OF ALL WELD METAL DEPOSITS (%):

C	Si	Mn	Cr	Mo	Ni
0.70	0.27	13.00	4.50	0.53	4.00

HARDNESS OF WELD METAL:

Hardness	Vickers (Hv)	Rockwell
As Welded	220 - 260	95 - 100 HB
Work Hardened	420 - 450	43 - 45 HRC

SIZE AND RECOMMENDED CURRENT RANGE: AC, DC (+)

DIAMETER (mm)	3.2	4.0	5.0
LENGTH (mm)	350	450	450
Current Amp	110 - 140	150 - 180	180 - 210

Welding Positions:	FLAT, VERTICAL UP, OVERHEAD
Approvals:	N/A

NOTE:

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.