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Tham khảo tài liệu 'handbook of extractive metallurgy 1 part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 350 Handbook of Extractive Metallurgy . Operated in which pickling rolling and con- correspond. The maximum economic output tinuous annealing have been combined de- of a continuous annealing plant is 800 000 t a spite the fact that the outputs of the continuous while tandem rolling mills can easily achieve annealing process and the rolling mill do not twice this production rate. Hof-rolled strip Austenite Ferrite . I . Hood furnace 800 C A 1100 C B Yes EP - CP HNO HF A -B Yes EP -CP HN03 HF Polishing if required Cold rolling Polishing if required Cold rolling Bright annealing A 800 C B -EP Ha2S04 CP HNOj HF A 800 c B -EP Na2S04 CP HNOj passive Bright annealing A -B -EP -CP HN03 passive CP HN03 passive Skin-pass rolling Skin-pass rolling Finishing Finishing Figure 6.120 Flow diagram of a combined annealing pickling line. A. annealing B abrasive blasting EP electrolytic pickling CP chemical pickling. h V a h c d Feed section- Direction of motion of strip Treatment Section- tn Exit section Figure 6.121 Annealing pickling line for stainless steel a Pay-off reel 1 b Pay-off reel 2 c Welding machine d Trimming shears e Looper 1 f Roll stand g Furnaces h Cooling zone i Abrasive blasting j Pickling k Spray washing 1 Looper m Take-up reel. Steel 351 Hof-rolled strip Figure 6.122 Surface coating in relation to other production processes. 6.5 Surface Coating 6.5.1 Introduction Technical developments in recent years have greatly increased the output of surface-coated steel strip. The demand for improved coưosion protect ion is not the only driving force. The properties of coated strip such as the yield point expansion properties and cold workability needed to be improved before these products could be used e.g. in the automotive industry. New processes had to be developed to improve welding and paint application properties for large-scale industrial manufacture. These involved close cooperation between the producers and consumers of coated steel sheet. Within the steel .
