球墨铸铁管的生产是在原材料经严格选择的铁 水中，添加了镁、钙等碱土元素

The production of nodular cast iron pipes is made by adding magnesium, calcium and other alkaline earth elements or rare earth elements to molten iron whose raw materials are strictly selected to make the graphite structure in the cast iron spherical, thereby eliminating the flake graphite in the gray cast iron pipe. The continuity of the metal crystal is cut off, and the mechanical properties are improved. Has good elongation, strength and toughness.

The production of spratly cast iron tube is in the raw materials by strictly selected iron water, added magnesium, calcium and other alkaline elements or rare earth elements, so that the graphite tissue in cast iron spline, thus eliminating the gray-mouth cast iron tube in the sheet graphite caused by the metal crystal continuity cut defects, mechanical performance can be improved. It has good elongation, strength and toughness.

In the production of ductile iron pipe, magnesium, calcium and other alkaline earth elements or rare earth elements are added to the molten iron with strictly selected raw materials, so that the graphite structure in cast iron is spherical, thus eliminating the gap of metal crystal continuity caused by flake graphite in gray cast iron pipe, and the mechanical properties are improved. It has good elongation, strength and toughness.<br>