GAS BLOWING PLUG FOR MOLTEN METAL STIRRING

• Main Authors: FUJIYOSHI RYOMA, IMAI SHINOBU, TOMITANI NAOSHI
• Format: Patent
• Language: English; Japanese
• Published: 02.08.2021
• Subjects: BLASTING; CHEMISTRY; DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS,IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KINDOF FURNACE; FURNACES; HEATING; KILNS; LIGHTING; MECHANICAL ENGINEERING; METALLURGY; METALLURGY OF IRON; OVENS; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; RETORTS; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; WEAPONS

To provide a multi-hole plug with a long service life solving the dissolution of a wind box and carburization and embrittlement to the wind box and stably usable without damaging durability and functions.SOLUTION: A multi-hole plug (10A) comprises an introduction pipe (2) through which gas stirring a molten metal flows, a wind box (1A) connected with the introduction pipe (2), including a wind box upper face (1a), a wind box side face (1b) and a wind box lower face (1c) and having an inside formed into a hollow shape, a piping group (3A) being a hollow pipe including stationary parts (3a) and opening parts (3b) and having a plurality of capillaries (31) in which the respective stationary parts (3a) are fixed to the wind box (1A) in a state of being communicated with the inside of the wind box (1A), a primary refractory (4) formed so as to burry the plurality of capillaries (31) and a secondary refractory (7) formed so as to cover the wind box (1A). The secondary refractory (7) is a non-carbon refractory having a fire-resisting degree of 28 SK or more, and the wind box side face (1b) and the wind box lower face (1c) are covered with the secondary refractory.SELECTED DRAWING: Figure 2 【課題】風箱の溶解、及び風箱への浸炭と脆化を解決し、耐用や機能を損なうことなく安定して使用できる長寿命のマルチホールプラグを得ること。【解決手段】溶融金属を撹拌するガスが流れる導入管（２）と、導入管（２）が接続され、風箱上面（１ａ）と風箱側面（１ｂ）と風箱下面（１ｃ）とを有し、内部が中空に形成されている風箱（１Ａ）と、固定部（３ａ）と開口部（３ｂ）とを有する中空管であり、風箱（１Ａ）の内部と連通した状態で各々の固定部（３ｂ）が風箱（１Ａ）に固定されている複数の細管（３１）を有する配管群（３Ａ）と、複数の細管（３１）を埋設して形成されている第１耐火物（４）と、風箱（１Ａ）を覆って形成されている第２耐火物（７）と、を備えるマルチホールプラグ（１０Ａ）であって、第２耐火物（７）は耐火度がＳＫ２８以上のノンカーボン耐火物であり、風箱側面（１ｂ）と風箱下面（１ｃ）とは、第２耐火物で覆われている。【選択図】図２