Production method of novel medium-thickness steel plate

Abstract

The invention discloses a production method of a novel medium-thickness steel plate to achieve that furnace returning reconstruction of unqualified products in a special thickness (larger than or equal to 60 mm) or waste inferior-quality products, large plate heads and the like generated in the production process of the medium-thickness plate is achieved, and waste is turned into wealth. On the premise that normal production is not disturbed, the loss caused by the unqualified products can be reduced, the inventory can also be reduced, and funds which are tied up are reduced; and meanwhile, the production capacity of a steel factory for ultra-thin plates and small piece weight steel plates is enriched and improved, production supplementing means are innovated, and the initial production period is shortened.

Description

technical field [0001] The invention relates to the technical field of production of medium-thick steel plates, in particular to a production method of a novel medium-thick steel plate. Background technique [0002] Steel plates with a thickness > 4mm are medium-thick steel plates. Among them, steel plates with a thickness of 4.5-25.0 mm are called medium plates, those with a thickness of 25.0-60.0 mm are called thick plates, and those with a thickness of more than 60.0 mm are called extra-thick plates. Medium and heavy plates are mainly used in construction, machinery, shipbuilding, petroleum, electric power and other industries; the main processes of medium and heavy plate rolling can be divided into heating - rolling - straightening - cutting - inspection - finished product into Warehouse and other processes; the main equipment involved are heating furnaces, which are divided into pusher type and walking type heating furnaces with two different structures, as well as ...

AI Technical Summary

Problems solved by technology

[0009] The existence of unqualified medium and thick plates made by the above method will have the following impact on steel mills: a substantial increase in production costs, and the production of unqualified products means that re-feeding is required for secondary production. According to the cost price of steel plates, 3000 yuan / Tons, the average-scale steel mills have a monthly output of more than 150,000 tons. According to the 1% output rate of unqualified products, the cost loss caused by unqualified products in one month is about 4.5 million yuan; it is difficult to dispose of unqualified products. , The contracts signed for medium and heavy plates are generally fixed rolling contracts, and the steel plates are produced according to the size of the specific needs of customers. Once unqualified products are produced, the size of these unqualified products may not be able to meet the needs of other customers, and the existence of the steel plate itself Large or small defects, once the steel plate is judged as unqualified, it is very difficult to sell it again. Most of the unqualified steel plates are stranded in the warehouse for a long time and no one cares about it; resulting in a large amount of production funds. These unqualified products, If it can’t be disposed of in time and stays in the warehouse, it will cause a large amount of production funds to be occupied. If it accumulates for a long time, it will inevitably cause more than tens of millions of funds to be occupied, which will seriously affect the capital flow and profit output of the steel mill.