Products

YAWATA 7018 (For 490N/mm²High 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

Property

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.

Classification

AWS A 5.1 : E7018
JIS Z 3211 : E4918

Chemical Composition

	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	0.36	1.03	0.010	0.011	0.09	≤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

Mechanical Properties

	Tensile Strength N/mm² (kgf/mm²)	Yield Strength N/mm² (kgf/mm²)	Elongation %	Charpy 2V-notch ที่ -20^oC, J (kgf.m)	Diffusible H₂ Content
Req.	≥430 (42)	≥430 (42)	≥17	-29^oC/-30^oC = ≥27 (AWS A5.1) -46^oC = ≥27 (AWS A5.1) -29^oC/-30^oC = ≥47 (ISO 2560-A) -49^oC/-50^oC = ≥47 (ISO 2560-A)	≤ 10 ml/100g
Typ.	530 (54)	460 (47)	≥33	≥ 110 (11.2)	≤ 5 ml/100g

Recommended Size and Power Range

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

Recommendations for Use

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.