Ship carbon steel seamless pipe (GB5213-85) is to create Class I pressure vessels piping, Ⅱ grade pressure piping, boiler and Superheater carbon steel seamless pipe. Carbon steel seamless pipe wall temperature does not exceed 450 ℃, alloy steel seamless pipe wall temperature exceeds 450 ℃.

GB5312-1999 (ship with carbon and carbon manganese steel seamless pipe). Mainly used for ship boilers and Superheater I, II level pressure tubes. Representative material for 360,410,460 steel grade and so on.

The method of calculation of structural steel

Calculation method for structural steel: structural steel weight of = 0.25 × π × (outer diameter of the square - the square of the inner diameter) × L × steel proportion, where: π = 3.14 L = length of pipe steel structure proportion taking 7.8

Therefore, the weight of the structure pipe = 0.25 × 3.14 × (outer diameter of the square - the square of the inner diameter) × L × 7.8 * If the size of the unit to take meter (M), the weight of the results of the calculation in kilograms (Kg).