Carburizing and nitriding treatment equipment in continuous annealing furnace

Abstract

Abstract Translated from Japanese (57)【要約】 【目的】焼鈍工程において加熱・均熱された鋼帯を、浸 炭・浸窒に最適な板温に制御してから浸炭又は浸窒を行 うことにより、冷延鋼板に均一な表面浸炭・浸窒層を形 成し得る連続焼鈍炉における浸炭浸窒処理設備を提供す る。 【構成】竪型連続焼鈍炉における連続焼鈍工程である加 熱帯２、均熱帯３と、浸炭工程である浸炭帯５との間 に、送給される鋼帯Ａを浸炭に適した板温に調節する板 温調節帯４を設けた。そしてこの板温調節帯４の入側と 出側には板温分布センサ１０，１１を設けて鋼帯Ａの板 幅方向及び長手方向への温度分布を検出し、その検出信 号に基づいて板温調節帯４のタワー内において送給され る鋼帯に対向して複数組設けられているガスジェット冷 却装置１２のうち、板幅方向に分割されたガスジェット ノズルの流量弁を制御して、鋼帯Ａの板幅方向の板温の ばらつきを解消する構造とした。 (57) [Summary] [Purpose] The steel strip heated and soaked in the annealing process is controlled to the optimum plate temperature for carburizing and nitriding, and then carburized or nitrified to obtain uniform cold rolled steel sheets. Provide a carburizing / nitriding treatment facility in a continuous annealing furnace capable of forming a smooth surface carburizing / nitriding layer. [Structure] Steel strip A fed between heating zone 2 and soaking zone 3 which is a continuous annealing step in a vertical type continuous annealing furnace, and carburizing zone 5 which is a carburizing step has a plate temperature suitable for carburizing. A plate temperature adjusting zone 4 for adjusting is provided. Then, plate temperature distribution sensors 10 and 11 are provided on the inlet side and the outlet side of the plate temperature adjusting zone 4 to detect the temperature distribution in the strip width direction and the longitudinal direction of the steel strip A, and based on the detection signal, the strip temperature is detected. Among the gas jet cooling devices 12 provided in a plurality of sets facing the steel strip fed in the tower of the temperature control zone 4, by controlling the flow valves of the gas jet nozzles divided in the plate width direction, The structure is such that the variation of the plate temperature of the steel strip A in the plate width direction is eliminated.

Inventors

• 👤 Makoto Shitomi
• 👤 誠 侍留
• 👤 Satoshi Shibuya
• 👤 聡 渋谷

Bibliographic Details