Without the packaging steel strip surface treatment

Without the packaging steel strip surface treatment, as a general rule, be hot rolled and cold rolled steel coils or steel belt. Steel plate is also available. The thickness of the size of the raw material range is from 0. 1 to 25 mm. From 10 mm to 4 mm, width 2500 mm, length over 12 m. Volume weight is the most commonly used 45 t biggest under 3 mm thickness and width under 600 mm steel belt. Steel can be carbon structural steel, quality carbon structural steel and low alloy steel and stainless steel, etc. Generally USES the carbon content in 0. Less than 1% of low carbon steel, the second is the carbon content in 0. 1? 0. 2% of the mild steel. High carbon content of steel must by annealing, or easy to crack during forming. The carbon content in 0. 9% of the carbon steel, you can't even after annealing treatment for cold bending forming. Phosphorus, sulfur, and inclusion have influence on the processing properties of carbon steel. Of non-metallic inclusions in rolling along the rolling when they asked the formation of fibrous tissue, easy cause crack when roll type cold bending forming. Roll type cold bending forming usually use rimming steel killed steel and silicon steel strip, for easy to crack during cold bending steel, molding the billet aluminum killed steel must be adopted. The material of cold bending steel in China is low carbon steel and high strength low alloy steel, successively has adopted the following material: Q215 - 一个( F) Q235 - 一个( F) Q215 - B( F) Q235 - B( F) 15、16 mn, mnv 15 mnvni, 0。 9 pv, lOPCuRe, 12 MNPV etc. , which is commonly used for Q215 and Q235 ( The yield point is 240 mpa) And 16 mn ( The yield point is 350 mpa) 。