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NHF-4340
AWS Specification: NONE
JIS Specification:

NONE

Other Specification:

I. APPLICATIONS:

NHF-4340 for welding and hardfacing of parts mode from ASTM 4340 steels.

II. DESCRIPTION:

NHF-4340 is an all-position, low hydrogen electrode developed for the welding of heat-treatable, high strength steels such as SAE 4130, 4330, 4340 and steel castings with similar hardening properties.

III. NOTES ON USAGE:

PREHEAT:

When heat treatable steels are welded with any ferritic electrode, including NHF-4340, it is necessary that the weldments be preheated to 400-600ºF (204-316ºC), with the same temperature held at interpass, in order to prevent cracking.

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

 

C

Mn

Si

P

S

Cr

Ni

0.36

0.83

0.52

0.011

0.014

0.81

1.82

V. HARDNESS OF WELD METAL: (as welded without oil quenched) 27-30 HRC

VI. TYPICAL MECHANICAL PROPERTIES:

 

 

Oil Quenched @ 871°C

Tampered @ 621°C

Oil Quenched @ 871°C

Tampered @ 510°C

Yield Strength, psi (MPa)

138,000 (950)

171,000 (1180)

Tenstile Strength, psi (MPa)

160,000 (1105)

189,000 (1305)

% Elongation in 2” (51mm)

15

12.5

% Reduction of Area

43

38.5

VII. WELDING POSITIONS: FLAT, OVERHEAD, VERTICAL

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

 

Size

(mm)

Dia.

2.6

3.2

4.0

5.0

Length

350

350

350

350

Current Range F

55~85

90~120

120~170

170~220

V, OH

50~80

80~110

100~160

140~190

 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.