Products

YAWATA 7018 (For 490N/mmHigh Tensile Strength Steel)

Classification : AWS A 5.1 : E7018 JIS Z 3211 : E4918

Approvals : ABS, BV, DNV GL, LR

Applications : Welding of 490 N/mm2 high tensile strength steels for ships, steel frames, bridges and pressure vessels.

PDFYawata-Pamphlet-7018.pdf 



YAWATA 7018 is an iron powder low hydrogen type electrode containing a large amount of iron powder in coating flux. Deposited metal gives excellent mechanical properties, crack resistance and X-ray quality. Weldability is good and high welding efficiency is obtained.
AWS A 5.1 : E7018 
JIS Z 3211 : E4918
 
C
Si
Mn
P
S
Cr
Mo
Ni
V
C.L.
Req.    
≤0.15
≤0.75
≤1.60
0.035
0.035
≤0.20
≤0.30
≤0.30
≤0.08
1.75
Typ.    
0.07
0.63
1.20
0.010
0.011
0.11
0.01
0.07
0.01
1.40
Req. = Requirement
Typ. = Typical results
N.S. = Not Specified
C.L. = Combined Limit for Mn + Ni + Cr + Mo + V

 
  Tensile Strength
N/mm2 (kgf/mm2)
Yield Strength
N/mm2 (kgf/mm2)
Elongation
%
Charpy 
2V-notch

ที่ -20oC, J (kgf.m)
Diffusible H2 Content
 
Req.    ≥430 (42) ≥430 (42) ≥17 ≥ 47 ≤ 10 ml/100g
Typ.    530 (54) 460 (47) ≥33  ≥ 170 (17.3)  ≤ 5 ml/100g
Diameter/
Length (mm)
2.6/300,350 3.2/350,400 3.2/450 4.0/350,400,450 5.0/400,450
Welding Position Current (A)
F 70-100 100-140 90-130 150-200 190-240
V, OH 60-90 80-120 80-120 120-160 140-180
1. Use dry electrodes only. Damp electrodes should be re-dried at 300~350℃ for 60 minutes before use.
2. Backstep method should be applied to prevent blowholes and pits at arc starting and arc length should be kept as short as possible during welding.
3. All water, rust and oil in groove should be completely removed to prevent cracks and blowholes.

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