Production problems of galvanized steel sheet in some developing countries
For the production of galvanized steel sheet in some developing countries,on the one hand,the production capacity can not meet the demand,on the other hand,the production capacity of existing units has not been brought into full play.As most of the galvanized steel sheet units in some developing countries have been put into operation in recent years,the production technology has not been fully mastered,and the varieties can not match the market demand in time.In addition,due to the insufficient supply of raw materials,the impact of imported products and other factors,the capacity of galvanized steel sheet units can not be brought into full play,and the operating rate of units is only about 70%.
The capacity of a single set of hot-dip galvanizing unit is relatively small,and the large-scale unit has great advantages in reducing production cost,improving product quality and competitiveness.The main problems existing in the production of galvanized steel sheets in some developing countries in terms of varieties,specifications and quality are as follows:
The production variety of galvanized steel sheet is incomplete
The output of high-quality hot-dip galvanized steel sheet is small.Most of the units producing building materials sheet have large zinc flower,small zinc flower and finishing zinc flower,and the galvanized steel sheet without zinc flower cannot be produced;The production of hot-dip galvanized steel sheet is insufficient,which is difficult to meet the needs of automobile and household appliance industry.
Single production specification of galvanized steel sheet
In terms of thickness,most of the units producing building material sheets in some developing countries have insufficient production capacity and small production capacity.Due to the large market demand,the import volume has increased sharply.In terms of width,most of the production lines are about 1250mm,which can not meet the requirements of automobile sheet in terms of specification.
Lack of zinc alloy galvanized steel sheet
Zinc coated steel sheets with zinc iron,zinc nickel,zinc aluminum,aluminum zinc and other alloy coatings occupy a considerable market share in developed countries.At present,some developing countries do not have the production capacity of such varieties.At present,galvanized steel sheet for automobile basically depends on import.
The self-sufficiency rate of raw materials of galvanized steel sheet is low
The raw materials of galvanized steel sheet production lines in some developing countries are almost completely purchased.The main reason for the purchase of raw materials is that the varieties can not meet the requirements,including high-quality galvanized steel sheet substrates for automobiles and household appliances and thin specification building materials substrates.
In short,high-quality and high-grade hot-dip galvanized steel sheets,especially galvanized steel sheets for automobiles and household appliances,are required to have very high surface quality,excellent sheet shape,different alloying coatings,good deep drawing performance and high strength.Therefore,the production of high-quality hot-dip galvanized steel sheet is a systematic project.It puts forward the requirements of consistent quality system for a series of production processes such as smelting,continuous casting,hot rolling,cold rolling and galvanizing,which is difficult to produce.
