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Carbon Steel Pipe Uneven Thickness Of The Reasons
Jul 12, 2017

Carbon Steel Pipe Uneven thickness of the reasons

Corrosion-resistant steel pipe coating thickness unevenness mainly in the circumferential direction of the distribution of the test points on both sides of the uneven thickness. The uniformity of thickness in the industry standard SY / T0413-2002 is not specified, and the minimum thickness of the coating is specified, but the minimum thickness value of the coating is not to be lower than the lowest point, rather than the number of test points average value.

3PE anti-corrosion steel coating coating process if the coating thickness is not uniform, will inevitably cause the waste of the butcher material, this is because the thinnest coating to ensure that the minimum thickness of the standard, the thick part of the thickness will be greater than Apply the standard thickness. And the case of uneven coating is easy to cause 3PE anti-corrosion steel pipe thinnest coating thickness of less than the standard situation.

There are several reasons for the uneven thickness of the production process. An effective way to control the unevenness of the 3PE anticorrosive pipe coating is to adjust the extruding molds to make the thickness of the anticorrosive coating as uniform as possible, and the unqualified steel pipe is not on-line. 1. Glass wool insulation

Glass wool is a category in glass fiber, is a kind of artificial inorganic fiber. Glass wool is the melting glass fiber, the formation of cotton-like material, chemical composition of glass, is a kind of inorganic fiber, with a good shape, small density, thermal conductivity, thermal insulation, sound-absorbing performance, corrosion Decorated, chemical stability. Generally used in high temperature steam insulation tube, steel casing steel insulation pipe, insulation anti-corrosion steel pipe.

2. Polyurethane foam insulation

Polyurethane foam is a special polyurethane product that encapsulates polyurethane prepolymer, foaming agent, catalyst and other components in pressure-resistant aerosol cans. When the material is ejected from the aerosol can, the foamy polyurethane material swells rapidly and forms a foam with the moisture in the air or in the matrix in contact with it. After the curing of the foam with caulking ﹑ ﹑ ﹑ ﹑ seal, heat insulation, sound absorption and other effects, is a kind of environmentally friendly and energy-saving, easy to use building materials, can be applied to seal plugging, fill in fill, fixation, Noise, especially for steel or aluminum doors and windows and walls between the sealed plugging and waterproof. Use a wide range of low cost! Anticorrosion straight seam steel pipe coating In the coating process, the quality of the project will often show the subject, is the coating bite the end, part of the bubble, and even the bottom of the film lost with the output. The cause of this weather is:

(1) coating supporting function is not good, primer and finish are not matched. Apply a coating with a strong polar solvent to the surface of the coating made of a weaker solvent. Such as in the upper alkyd paint or grease paint plus nitro-based paint; rosin-containing resin after the film coated with a large paint; paint on the oil paint alkyd paint; alkyd or grease coated with oxidized rubber coating, Polyurethane coatings and so on. The penetration and swelling of the strong solvent on the film causes the base coating to bite.

(2) coating is not dry to paint the next paint. Such as vinyl chloride enamel or varnish is not dry, plus the second coating. (3) in the paint or paint the next coat, the choice of too thin thinner, the bottom of the paint swelling.

For the reasons for the above growth, we may wish to organize the following procedures to control:

(1) Seriously coated with paint instructions. Ordinary similar coatings can be set with each other. (Epoxy, polyurethane, etc.), paint with a weak solubility of the paint (chlorinated rubber, alkyd, phenolic, etc.), such as the use of paint, In the rosin resin film coated with a large paint is split appropriate, to paint, must be selected by the grinding control, brushing the filter layer, dry and then use a clean cloth to remove the surface omission particles, sandpaper polished, and then painted Big paint





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