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NHF-4140
AWS Specification: NONE
JIS Specification:

NONE

Other Specification:

I. APPLICATIONS:

NHF-4140 for welding and hardfacing of parts made from ASTM 4140 steels. In addition to its use for welding rolled plate steel, foundries are a principal user for repair welding high-tensile castings.

II. DESCRIPTION:

NHF-4140 is an all-position, low hydrogen electrode designed for welding SAE 4140 and similar heat-treatable steel where the weld metal must match the heat treating properties of the parent metal.

III.  NOTES ON USAGE:

PREHEAT:

When heat treatable steels are welded with any ferritic electrode, including NHF-4140, 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

Mo

0.35

0.86

0.4

0.012

0.014

0.85

0.35

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)

127,000 (875)

165,000 (1140)

Tenstile Strength, psi (MPa)

140,000 (965)

180,000 (1240)

% Elongation in 2” (51mm)

18

12.5

% Reduction of Area

52

40

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