Identification of nodular cast
iron pipe and inferior method 1.
And inferior ductile cast iron
pipe is easy to fold.
Fold is formed on the surface of the ductile iron pipe line, this kind of defect often throughout the entire product longitudinal.
Causes of fold is due to the pursuit of the false and inferior, high efficiency, large reduction, handle, when the next rolling produce folding, folding products will craze, after bending strength of the nodular cast iron pipe big decline.
And inferior nodular cast iron pipe appearance often have pitted surface phenomenon.
Textured was caused by worn groove with irregular nodular cast iron pipe surface uneven defects.
Due to shoddy ductile cast iron pipe manufacturer to pursuit of profit, often appear the groove rolling.
And inferior nodular cast iron tube surface are prone to scarring.
For two reasons: (1) and inferior uneven nodular cast iron pipe material, impurities.
(2) and inferior material manufacturer guide equipment simple, easy to stick steel, these impurities after the roll bite are prone to scarring.
And inferior material surface cracks easily, because its billet is adobe, adobe air, adobe in the process of cooling due to the effect of thermal stress, cracks, after rolling there is crack.
And inferior nodular cast iron pipe is easy to scratch, the reason is false and inferior material manufacturer equipment simple, easy to produce burr, scratch surface of nodular cast iron pipe.
Deep scratches to reduce the strength of the nodular cast iron pipe.
And inferior ductile iron pipes without metallic luster, reddish or similar to the color of the pig iron, two point two, its billet is adobe reasons.
And inferior transverse reinforcement of the ductile iron pipe and low, often appear phenomenon of discontent, because manufacturers to achieve big minus tolerance, finished product quantity of the previous way slants big, small iron type, groove filling.
And inferior ductile cast iron pipe cross-section oval, because the factory in order to save material, the quantity of the finished product roll before 2 slants big, the strength of rebar is greatly decreased, but also do not conform to the standard of rebar shape size.
High quality uniform composition of the ductile iron pipe, cold shearing machine high tonnage, cutting head end face smooth and neat, and shoddy material because the material is poor, cutting head end face often have meat, or uneven, and no metallic luster.
And due to low and inferior material manufacturers cut head, end there will be a big handle.
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