We are offering tungsten boat. grade:w1, wal1, wal2;specification:f0.1 60mm, 0.2 10 200 300mm;category:sintering, forging, drawing, straightening, polishing, rolling;standard:gb3459-82, gb4187-84, gbt4181-97, gb3875-83, qbs1331-91, other standards: astm b760-86 astm b777-87