What are the difficulties and countermeasures of galvanized pipe production

Galvanized pipe is deeply popular in the reinforced profile industry, deeply loved by everyone, but when we purchase galvanized pipe, we must also master some skills to distinguish the advantages and disadvantages of products, to help us choose high quality steel when purchasing.1.  Shoddy galvanized pipe is easy to scratch, the reason is that shoddy galvanized pipe manufacturers simple equipment, easy to produce burrs, scratch the steel surface.  Deep scratching reduces the strength of steel.2.  The fake and inferior galvanized pipe has no metallic luster and is light red or similar to pig iron.3.  The transverse bar of fake and inferior galvanized pipe is thin and low, and the phenomenon of filling is often dissatisfied.  The reason is that in order to achieve large negative tolerance, the pressure of the first few passes of the finished product is too large, the iron shape is too small, and the pass shape is not satisfied.4.  The cross section of the fake and inferior galvanized pipe is oval, because the manufacturer in order to save materials, the pressure of the first two lines of the finished roll is too large, the strength of the pipe is greatly reduced, and it does not meet the standard of the external size of the steel pipe.5.  The composition of galvanized pipe is uniform, the tonnage of cold shear machine is high, the end face of the cutting head is smooth and neat, and the shoddy galvanized pipe often has the phenomenon of meat falling off the end face due to the poor material, that is, uneven and no metallic luster.  And because the products of fake and inferior manufacturers cut the head less, the head and tail will appear big ears.6.  The material of the fake galvanized pipe contains more impurities, the density of the steel is small, and the size is out of tolerance, so in the absence of a vernier caliper, it can be weighed and checked.  In general, it is better to adjust the quantity, mainly because of the cumulative error and probability theory.

Galvanized pipe is one of the most commonly used pipe fittings in the construction of our greenhouse. Manufacturers use a variety of ways in manufacturing, and each way determines the different quality of galvanized pipe. We will test galvanized pipe in practical use to ensure that galvanized pipe can be used reasonably, so how do we test its appearance? And how should the physical and chemical properties of galvanized pipe be tested?

Check the geometric size and shape of galvanized pipe:

1, galvanized pipe wall thickness inspection: micrometer, ultrasonic thickness measuring instrument, at both ends of no less than 8 points and record.

2, galvanized pipe length inspection: steel tape, manual, automatic length measurement.

3, galvanized pipe bending check: straight ruler, level (1m), feeler ruler, fine line measurement of bending per meter, full-length bending.

4, galvanized pipe end groove Angle and blunt edge inspection: square, card.

Galvanized management performance test (agricultural galvanized pipe) :

1, galvanized pipe tensile test: test stress and deformation, determine the strength of the material (YS, TS) and plastic index (A, Z) longitudinal, transverse sample section, arc type, circular sample.

2, galvanized pipe impact test: CVN, notch C type, V type, work J, standard sample 10×10×55(mm), non-standard sample 5×10×55(mm).

3, galvanized pipe hardness test: Brinell hardness HB, Rockwell hardness HRC, Vickers hardness HV, etc.

4, galvanized pipe hydraulic test: test pressure, stable pressure time, p=2Sδ/D.