How to identify the model of galvanized pre-buried casing?

For some scenes with low decorative requirements, galvanized pre-buried casing is one of the commonly used waterproof casing. Advantages in the low price, simple workmanship, fast shipping rate, is the current low-end decorative market widely used in stainless steel materials. The disadvantage is that it is not resistant to corrosion, easy to rust, and requires a high degree of dryness in the use environment, mainly due to the high manganese content of galvanized pre-buried casing, easy to rust. In addition, the appearance of galvanized pre-buried casing pipe is relatively dull, not so bright and clean.
The general nominal diameter = the average of the inner diameter + wall thickness, the internal diameter of galvanized pre-buried casing with the letter D, followed by the size of the additional inner diameter and wall thickness, for example, the inner diameter of 200 200 galvanized pre-buried casing wall thickness of 6MM, with DN200 * 6.0 to say. DN125, DN200, DN450 and other models belong to the common specifications.
 
Melting argon arc welding using welding wire, according to its diameter, there are fine wire and coarse wire. It is generally believed that the diameter of the wire is less than ф1.6mm, a fine wire welding; greater than ф1.6mm, a coarse wire welding, coarse wire diameter up to ф6mm. wire diameter is different, the arc form and the use of current range is also different. In recent years, the coarse wire high current molten argon arc welding has been rapidly developed, usually using a diameter of more than 3.2mm coarse wire and more than 500A high current, is also a kind of welding method can achieve thick plate welding. Galvanized pre-buried casing is used in a wide range of fields, such as petroleum, chemical and many other equipment in the construction is inseparable from the galvanized pre-buried casing, then in the usual production process of galvanized pre-buried casing will also produce carbide. This material also has its own characteristics. We should try our best to find out how it is formed. The principle of alloying of galvanized pre-buried casing materials, through the correct heat treatment, give full play to the role of alloying elements.