steel board(A B C D ABS NK BV;X60 X65 API5L GB/9711)
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steel board: 1 thickness 4.5-19mm; 2 width 1-1.6m;3 steel gradeA B C D X60 X65 ;4 standard ABS NK BV API5L GB/9711
steel board: 1 thickness 4.5-19mm; 2 width 1-1.6m;3 steel gradeA B C D X60 X65 ;4 standard ABS NK BV API5L GB/9711