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NHF-800
NHF-800
AWS Specification: NONE
JIS Specification:

JIS Z351

Other Specification:

DF3C-700B

I. APPLICATIONS: 

Hard surfacing of pump casings, cutter knives, etc.

II. DESCRIPTION:

The deposited metal of NHF-800 is martensitic structure, which contains C, Cr and B as principal alloy elements. It has extremely high hardness caused by precipitation of chrome carbide and chrome boride. It is most suitable for overlaying of the parts subjected to heavy soil abrasion.

III. NOTES ON USAGE:

  • 1. Usually over 200ºC preheating and 500~600ºC postheating are required.

  • 2. Take care of the increase of cracking tendency when used for over triplelayer welding.

  • 3. Underlaying with low hydrogen type electrodes (N-7016 or N-18) is required.

  • 4. Dry the electrodes at 150~200ºC for 30~60 minutes before use.

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

 

C

Si

Mn

Cr

B

W

0.91

1.88

1.32

3.87

0.52

2.54

V. HARDNESS OF WELD METAL: 62 – 64 HRC (740 – 800 Hv)

VI. WELDING POSITIONS: FLAT, OVERHEAD, HORIZONTAL

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

 

Size

(mm)

Dia.

3.2

4.0

5.0

6.0

Length

350

400

400

450

Current Range

90~130

120~180

170~230

210~280

 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.