公开(公告)号：US20020128144A1

公开(公告)日：2002-09-12

申请号：US09989548

申请日：2001-11-20

Applicant: NKK CORPORATION

Inventor： Manabu Tano ,  Hideto Takasugi ,  Hirohisa Nakajima ,  Akira Shirayama ,  Manabu Arai ,  Atsushi Tsunoda ,  Masaki Komatani

IPC: C04B035/52 ,  B32B005/16

CPC classification number: F27D3/1536 ,  B22D41/46 ,  C21C5/4653 ,  Y10T428/2982

Abstract: A filler sand for a ladle tap hole valve contains 45 to 55 mass % of zircon sand, 30 to 40 mass % of chromite sand and 10 to 20 mass % of silica sand and is blended externally with 0.05 to 5 mass % of carbon black calculated based on the total amount of the sands; or contains 30 to 90 mass % of chromite sand and 10 to 70 mass % of silica sand and is optionally blended externally with 0.05 to 5 mass % of carbon black, wherein 95 mass % or more of the chromite sand consists of particles having diameters falling within a range of 150 to 850 nullm, 60 mass % or more of the chromite sand consists of particles having diameters falling within a range of 212 to 600 nullm, 95 mass % or more of the silica sand consists of particles having diameters falling within a range of 300 to 1180 nullm, and 90 mass % or more of the silica sand consists of particles having diameters falling within a range of 600 to 1180 nullm.

Abstract translation: 钢包龙头孔阀的填砂砂含有45〜55质量％的锆石砂，30〜40质量％的铬铁矿砂和10〜20质量％的硅砂，并与0.05〜5质量％的炭黑混合， 基于砂的总量; 或含有30〜90质量％的铬铁矿砂和10〜70质量％的硅砂，任选地与0.05〜5质量％的炭黑混合，其中，95质量％以上的铬铁矿由直径下降的粒子构成 在150〜850μm的范围内，铬铁矿的60质量％以上的粒子由直径在212〜600μm的范围的粒子构成，所述硅砂的95质量％以上的粒子由直径为 300〜1180μm的范围，和90质量％以上的硅砂由直径在600〜1180μm的范围内的粒子构成。