Nowadays, many spiral pipe manufacturers through the production and processing of spiral pipe in the surface did not meet the standard requirements, but there are still successive spiral pipe. Here are some spiral pipe manufacturers to understand some of the requirements for the surface of the pipe.
Although the standard specifies the spiral pipe “surface finish”, but some manufacturers in the production of manufacturing, due to a variety of reasons leading to the surface of the steel pipe up to 10 kinds of problems. Many of the problems mainly include: spiral pipe surface slits (cracks), hairline, internal folding, external folding, rolled, internal straight channel, external straight channel, delamination, scabs, dents, convex packet, pitting (pitting), abrasion (scratching), internal spiral channel, external spiral channel, green line, correcting concave, roll marks and so on.
In the above mentioned problems on the surface of the steel pipe, some of the problems of the spiral pipe pipe performance indicators on the degree of harm is very serious, known as hazardous problems, such as steel pipe cracks (cracks), internal folding, external folding, rolled, off the layer, scabs, pulling the concave, convex packet, etc.; some of the problems on the performance indicators of the steel pipe direct impact on the relative small, known as conventional problems, such as spiral pipe pockmarks (surfaces), green line, rubbing (scratching, touching) injuries, light Some problems have a relatively small direct impact on the performance indicators of steel pipe, which are called conventional problems, such as spiral pipe pitting (surface), blue line, abrasion (scratch, touch) injury, mild internal and external straight channel, mild internal and external spiral channel, correction of concave, roll mark, etc..
Although some very mild conventional problems with minimal direct impact on the utility of the spiral pipe can remain on the pipe, the standard still has very stringent limitations on the depth and length (size) of the problem.
Hazardous problems on the surface of the spiral pipe are selected for complete elimination by excision or regrinding. When grinding is completed on those steel pipe surface problems that allow grinding, the depth of the standard grinding place and the shape of the grinding point must be in accordance with the standard criteria. So in order to better enhance the surface quality of the spiral pipe, sometimes the internal and external surfaces of the steel pipe will be completed shot blasting (sand), sand grinding or machining turning treatment.
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