OK 48 is E 7018 and is with Mn up to 1.2%
The impact strength is 80 J at -40 C. UTS values are app. 540 N/sq.mm.
Works win DCEP, DCEN & AC 90 OCV.
OK 55 is E 7018-1 and is with Mn up to 1.5%
The impact strength is 80 J at -50 C. UTS values are app. 590 N/sq.mm.
Works with only DCEP & AC 65 OCV t
U will get the values after a prolonged PWHT.
As U have seen, impact strength is higher in OK 55 and recommended
where more impact is needed.
The baking temp. weld ability is same except that, u will end up paying
bit more for OK 55.There is no necessity to change to OK 55 when not needed.
Regards,
C Sridhar.
Technical Adviser - Welding,
for Alsta Pristine Engineering Private Limited, --(SS fab). Bangalore
(A venture of Advance Eng. Training & Inspection Services). Chennai,
C Sridhar.
Technical Adviser - Welding,
for Alsta Pristine Engineering Private Limited, --(SS fab). Bangalore
(A venture of Advance Eng. Training & Inspection Services). Chennai,
Mobile nos: 0 94449 71097, 0 7406 326326, 0 94445 21267.
From: Mahesh Unninarayanan <mahesh84kumar@gmail.com>
To: materials-welding@googlegroups.com
Sent: Thursday, 26 June 2014 7:36 PM
Subject: [MW:21268] diferrence between E7018.. OK 55 & E7018.. OK 48
Dear all,
-- Was there any difference in the weld quality if we use one with E7018.. OK 55 and other with E7018.. OK 48..
Is there any difference in temperature range for baking and holding between the above two.. kindly share your information regarding this.
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