Dear Adi,
-- The designation of 1 in E 7018-1 represents that the electrode will meet the Charpy V-Notch Impact toughness
requirements at low tempearture. Actually, 7018-1 has better toughness at very lower sub-zero temperature as
well as more Manganese content than E7018.
The purpose of having higher Mn% is to reduce the Ductile/Brittle Transition Temperature and to improve the low
temperature impact values of the weld metal.
The E 7018 will offer impact value of 47 Joules at -30 degree celcius and E7018-1 will give 47 joules at -50 degree
celcius.
Thanks and Regards,
Mani SarojKumar.
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