ABSTRACT
In recent years, the demand for wide heavy-thickness coils has increased dramatically. The demand comes mainly from projects of spiral-seam and straight-seam steel pipes used for piles, water, and natural gas lines. The most common sizes are 15.5-25.4 mm thick and 1220-2440 mm wide. Generally, carbon steel and low grades of high strength, low alloy (HSLA) steel are employed for piles and water lines. Medium and high grades of HSLA steel are adopted for natural gas lines.
