钢丝热处理—表面处理生产线表面处理工艺参数的确定

钢丝热处理—表面处理生产线工序复杂,在生产时钢丝要经过热处理、电解酸洗、电解碱洗、热水洗、化学酸洗、磷化、皂化、烘干等工序,各个环节的工艺参数都对钢丝拉拔性能有较大影响。经过反复试验,探索出使钢丝在38 s完成清洗、磷化的工艺参数:电解酸洗时,ρ(H2SO4)为200～300 g/L,ρ(FeSO4)<200 g/L,电流密度为10～17 A/dm2;电解碱洗时,ρ(NaOH)为220～320 g/L,温度为40～60℃,电流密度为21～35 A/dm2;磷化时,ρ(ZnO)为20～30 g/L,ρ(NO3-)为30～40 g/L,ρ(PO43-)为20～30 g/L,总酸度为75～95点,游离酸度为7～15点,温度为85～95℃。用处理后φ2.8 mm钢丝拉拔φ1.0 mm钢丝,总压缩率为87.2%、拉拔速度为800～1 000 m/min,拉拔结果均达到要求。

Determination of surface treatment process parameters of steel wire heat treatment and surface treatment line

The procedures of steel wire heat treatment and surface treatment are complex： such procedures as heat treatment, electrolysis pickling, electrolysis alkali washing, hot water washing, chemical pickling, phosphating, saponification and drying are carried out as steel wire production, the parameters of each link have bigger effect on the drawing properties of steel wire. The parameters to complete steel wire cleaning and phosphating within 38 seconds are explored out by tests again and again： the mass concentration of sulphuric acid is 200 to 300 g/L, the mass concentration of FeSO4 is less than 200 g/L and the electrolysis current density is 10 to 17 A/dm^2 as electrolysis pickling; the mass concentration of NaOH is 220 to 320 g/L, temperature is 40 to 60 ℃, electrolysis current density 21 to 35 A/dm^2 as electrolysis alkali washing; the mass concentration of ZnO, nitrite radical and phosphate radical is 20 to 30 g/L, 30 to 40 g/L, 20 to 30 g/L respectively, the total acidity is 75 to 95 points, free acidity is 7 to 15 points and the temperature is 85 to 95℃ as phosphating. The diameter 2.8 mm steel wire was drawn to 1.0 mm after treatment, whose total draught reached 87.2% , the drawing speed was 800 to 1 000 m/min, the drawing result reaches requirement.