INDEPENDENCE, Ohio--(BUSINESS WIRE)--GrafTech International Ltd. (NYSE:GTI) will report earnings for the first quarter ended March 31, 2015, on Thursday, April 30, 2015. GrafTech’s webcast and conference call with investors and analysts will be held on the same day at 11:00 am Eastern Time. The live webcast will be available at www.graftech.com in the investor relations section. The dial-in telephone numbers for the live audio are: Domestic – (877) 736-7716International – (706) 501-7465 The reb