Technical development trend of galvanized sheet

First, environmental protection coating material breakthrough

1. Chromium-free passivation technology

By using silane composite film instead of traditional chromate, the hexavalent chromium content decreased from 120mg/m² to less than 0.1mg/m². The C5 type chromium-free treatment agent developed by Risteel has a salt spray resistance time of 720h.

2. Zinc, aluminum and magnesium alloy coating

The new Zn-6%Al-3%Mg coating improves the notch protection performance by 10 times, and the occurrence time of red rust is extended from 3 years to 15 years. It has been applied to outdoor scenes such as photovoltaic supports.

Second, intelligent production technology

1. Digital twin system

The 3D temperature field model was established for Angang CGL production line, and the prediction accuracy of coating phase structure was 98%. Real-time data acquisition by 1000+ sensors can dynamically adjust the alloying furnace temperature (accuracy ±1.5℃).

2. Green manufacturing breakthrough

The waste acid recycling unit can recover 98% of HCl, and the acid consumption per ton of steel is reduced from 35kg to 1.2kg. Induction heating technology saves 30% energy and reduces CO₂ emissions by 12 tons/tons of production.

Third, the expansion of new application areas

Construction field: Steel silo adopts 275g/m² coating, with a service life of 25 years; In the automotive field, the application of galvanized aluminum-magnesium plate in battery shell increased by 300%; Home appliances: Fingerprint resistant coating (AF) market share exceeded 40%.