Aluminized zinc, colour coated steel coil, hot dip galvanized steel coil and other coated steel coil prefixes are mostly the following grade standards.

The first one is DX51D, where D stands for "plated", which means that the surface of the steel plate is plated steel. 51D stands for general structural steel. If the grade is 52D, it means that the plate is for stamping. In the case of 53D, the plate is for deep drawing. As the X number in 5XD increases, the better the steel and the softer the stamping. The European standard is generally used by some early state-owned steel mills, such as Anshan Steel, Ben Steel, Wuhan Steel, etc. European standard grades are generally such as: DX51D+Z/AZ DX52D+Z/AZ DX53D+Z/AZ DX54D+Z/AZ.

The second, the American Standard ASTM A792, as for the American Standard I contact less, temporarily can not use words to express all, please understand. However, as far as we know, the American Standard is generally adopted by some domestic joint ventures. Such as: Korea United and other steel mills. The foreign trade orders of joint ventures are large for domestic enterprises, so in order to cater for the export trade, it is natural to adopt the American standard.

The third type, the Japanese SGCC, is particularly important to introduce the letters and numbers of the zinc content behind the Japanese standard, such as the general Japanese SGCC + Z. The Z will be followed by the weight of the zinc layer, such as SGCC + Z27. No. Z27 is the same as Z270 in the European standard above, which means 270 grams of zinc.

The fourth type is the enterprise standard. The enterprise standard is a steel number developed by some large domestic steel mills according to international standards such as the European, American and Japanese standards. For example:Q/BQB 440-2009 TDC51D+Z/AZ is the standard. Steel Corporate Standard (Q/BQB) The steel grades in the Corporate Standard can be broadly divided into three sources: the Japanese JIS standard, the German DIN standard and the steel grades developed by Chinese steel company itself. The steel number transplanted from the Japanese JIS standard, the first place is often S (Steel); the steel number transplanted from the DIN standard.