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NHF-ST6
AWS Specification: ECoCr-A
JIS Specification:

D CoCr-A

Other Specification:

I. APPLICATIONS:

Hard surfacing of valve seats, forging dies, crushers, hammer, edges, cutting knives and blowers.

II. DESCRIPTION :

NHF-ST6 Covered electrode produce a medium hardness cobalt-chromium deposit for high temperature applications with good abrasive wear and good impact resistance. NHF-ST6 is the most versatile and widely used cobalt alloy with a good balance of abrasion and impact resistance. Chromium carbides contained in the deposit, have excellent resistance to many forms of chemical and mechanical degradation, including galling and cavitation erosion. It bonds well with all weldable steels, including stainless.

     III. NOTES ON USAGE:

  • Preheat at 300ºC and over in general. Use NIHONWELD temperature indicating sticks or NIHONWELD interpass temperature gauge to determine if proper temperature is achieve before welding. For more details see NIHONWELD Chart 4 Easy Steps for welding. 

  • It is effective to postheat at 600ºC and to slow cool after welding to prevent cracking.    

  • Dry the electrodes at 150-200ºC for 30 – 60 minutes before use.  Use NIHONWELD portable drying ovens.

IV. HARDNESS OF WELD DEPOSIT: 38 – 44 HRC (370 – 440 Hv)

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

 

C

Si

Mn

Cr

W

Co

0.84

0.57

0.97

30.46

4.53

Balance

VI. WELDING POSITIONS: FLAT, VERTICAL UP, OVERHEAD

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

 

Size

Dia

3.2

4.0

5.0

(mm)

Length

350

350

350

Current Range

90-120

110-150

140-180

 

 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.