How to test the thickness of the galvanized layer of the square pipe? What standard is used to test

If it is a galvanized layer on the metal, it can be detected with Guangzhou Dongru coating thickness gauge, and the accuracy of DR360 is OK.

The national standard for the thickness of galvanized steel pipes is as follows: hot-dip galvanized pipes, in order to improve the corrosion resistance of steel pipes, galvanized general steel pipes. Galvanized steel pipes are divided into hot-dip galvanizing and electro-galvanizing, hot-dip galvanizing has a thick galvanized layer, low electro-galvanizing cost, and the surface is not very smooth.

Nominal wall thickness:;

Coefficient:. Note: The mechanical properties of steel are an important index to ensure the final use performance (mechanical properties) of steel, which depends on the chemical composition of the steel and the heat treatment regime. In the steel pipe standard, according to different use requirements, the tensile properties (tensile strength, yield strength or yield point, elongation) and hardness, toughness indexes, as well as the high and low temperature properties required by users are specified.

Grade of galvanized pipe steel: Q215A; q215b；q235a；q235b。

The national standard for the thickness of galvanized steel pipes is as follows:

There is a direct relationship between the wall thickness of the pipe and the pipe diameter, as well as the wall thickness grade, which standard is needed, you can check the national standard for seam pipe or welded pipe for comparison.

There are many current standards for welded pipes, and the standards for longitudinal welded pipes are: GB T3091-2008 welded steel pipes for low-pressure fluid transportation.

GB T9711 Oil & Gas Steel Pipe.

The national standard for the thickness of galvanized steel pipes is as follows:

The specific criteria are as follows:

Galvanized steel pipes are divided into cold-dip galvanized pipes and hot-dip galvanized pipes, the former has been banned, and the latter has been advocated by the state for temporary use. Galvanized steel pipes with hot-dip or electro-galvanized layers on the surface. Galvanizing can increase the corrosion resistance of steel pipes and prolong their service life.

Galvanized steel pipes with hot-dip or electro-galvanized layers on the surface. Galvanizing can increase the corrosion resistance of steel pipes and prolong their service life.

Galvanized pipe has a wide range of uses, in addition to the line pipe for water, gas, oil and other general low-pressure fluids, it is also used as oil well pipe, oil pipe, oil pipeline in the petroleum industry, especially in offshore oil fields, oil heater, condensate cooler, coal distillation and washing oil exchanger pipe, as well as trestle pipe pile, mine tunnel support frame pipe, etc.

1. Uniformity of galvanized layer: steel pipe samples shall not turn red (copper plating color) after being impregnated in copper sulfate solution for 5 consecutive times.

2. Surface quality: The surface of the galvanized steel pipe should have a complete galvanized layer, and there should be no black spots and bubbles that have not been plated, and small rough surfaces and local zinc tumors are allowed.

3. Weight of galvanized layer: According to the requirements of the buyer, the galvanized steel pipe can be used to determine the weight of the zinc layer, and its average value should not be less than 500g square meters, of which any sample shall not be less than 480g square meters.

The galvanized steel pipe of the national standard is a steel pipe with an outer diameter of 219 mm, and the national standard is millimeters.

Zinc pipe related material steel pipe weight calculation formula: [.]

(Outer diameter --- wall thickness) *wall thickness] *0 0 2 4 6 6 = k g /] *0 .

0 2 4 6 6 = k g /] *0 . 0 2 4 6 6 = k g /] *0 .0 2 4 6 6 = k g m ((weight per m))) gauge outer diameter m m wall thickness m m minimum wall thickness m m welded pipe 6 m fixed-length galvanized pipe (6 m fixed-footage m weight k g root weight k g root weight k g root weight k g root weight k g nominal inner diameter millimeters inch d n 1 5 1 2 2 1

1 4d n 2 0 3 / 4 2 6 . 9 2 . 8 2 .

7 6 1 0 . 5 6d n 2 5 1 3 3 . 7 3 .

4 6 2 . 5 5 4 1 5 . 3 2d n 3 2 1 .

5 6 2 1 . 3 6d n 4 0 1 . 5 4 8 .

6 0d n 5 0 2 6 0 . 3 3 . 8 3 .

6 0 7 3 3 . 6 4d n 6 5 2 . 5 7 6 .

2 1d n 8 0 3 8 8 . 9 4 . 0 8 .

2 8d n 1 0 0 4 1 1 4 . 3 4 . 0 1 0 .

1 8d n 1 2 5 5 1 4 0 4 . 5 1 5 . 0 4 9 0 .

2 4 1 5 . 9 4 2 9 8 . 6 5d n 1 5 0 6 1 6 8 .

0 8 1 9 . 2 7 1 1 5 . 6 2d n 2 0 0 8 2 1 9 .

1 6 .0 welded pipe 3 1 5 3 1 8 9 .

1 8d n 2 0 0 8 2 1 9 . 1 6 .5 hot-dip galvanized 3 6

Well, it's a bit of a mess, let's look at the references.

The thickness of the national standard of hot-dip galvanized steel pipe is from DN25-DN150

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How much is a ton of hot-dip galvanized steel pipe weighing 7 kg.

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The wall thickness of the national standard 20*40 galvanized square pipe is between, and the allowable deviation shall not exceed plus or minus 10% of the nominal wall thickness when the wall thickness is not more than 10mm, and when the wall thickness is greater than 10mm, it is plus or minus 8% of the wall thickness, except for the wall thickness of the corner and weld area.

This wall is much thicker,,, etc., and my family can do it with the thickest.

The last one is thick, Shanghai Xiagang Industrial ****021-57699647 is the total distribution of Tianjin galvanized square pipe manufacturers in Shanghai, and it has an advantage.

The length is 6 meters, and the thickness is about .

Zinc is easily soluble in acids and alkalis, so it is called an amphoteric metal. Zinc is almost unchanged in dry air. In moist air, a dense basic zinc carbonate film is formed on the zinc surface.

In sulfur dioxide, hydrogen sulfide and marine atmosphere, zinc corrosion resistance is poor, especially in high temperature and high humidity atmosphere containing organic acid, zinc coating is easy to be corroded. The standard electrode potential of zinc is that for the steel matrix, the zinc coating is an anodic coating, which is mainly used to prevent the corrosion of steel, and its protective performance has a great relationship with the thickness of the coating. Zinc coatings can be passivated, dyed or coated with a protective agent to significantly improve their protective and decorative properties.

According to the "Safety Technical Code for Fastener Steel Pipe Scaffolding for Building Construction JGJ130-2011", the steel pipe specification should be, that is, the wall thickness is.

Representation method of wall thickness grade of steel pipe.

The method of representation of the wall thickness class series of steel pipes varies from standard to standard.

There are three main ways to represent it:

1) Indicated by pipe table number (SCH): For carbon steel pipe wall thickness, there are 10 grades such as SCH (if the number is followed by S, it means stainless steel pipe); For stainless steel wall thickness series there are:

There are four grades of 5s, 10s, 40s and 80s.

2) Expressed by tube weight, such as STD (standard weight), XS (thickened tube), XXS (extra thick tube).

3) It is expressed as the wall thickness of the steel pipe, that is, the "outer diameter of the pipe wall thickness", such as 89x4

The development of steel pipe production technology began with the rise of bicycle manufacturing, the development of oil in the early 19th century, the manufacture of ships, boilers and airplanes during the two world wars, the manufacture of thermal power boilers after World War II, the development of the chemical industry, and the drilling and transportation of oil and gas, all of which have strongly promoted the development of the steel pipe industry in terms of variety, output and quality.

Galvanized square pipes are divided into hot-dip galvanized square pipes and cold-dip galvanized square pipes from the production process. It is precisely because the processing of these two galvanized square pipes is not the same, which also creates many different physical and chemical properties.

The hot-dip galvanized square pipe is a square pipe made by welding after using steel plate or steel strip crimping, and on the basis of this square pipe, the square pipe is placed in the hot-dip galvanizing pool and formed after a series of chemical reactions.

The production process of hot-dip galvanized square pipe is relatively simple, and the production efficiency is very high, and there are many varieties and specifications, and the equipment and capital required for this kind of square pipe are very small, which is suitable for the production of small galvanized square pipe manufacturers. However, in terms of strength, the strength of this steel pipe is much lower than that of seamless square pipe.

1. Specification table of square pipe and rectangular pipe, name specification wall thickness mm name specification wall thickness mm

Square tube 20*20 20*25*20*

Square tube 30*30 25*40*30*

Square tube 50*50 30*60*40*

Square tube 70*70 40* 80*50*

Square tube 90*90 50*100*60*

Square tube 120*120 50*140*140 50*150

Square tube 150*150 60*160*160 100*150

Square tube 180*180 100*200 200*200 100*250

Square tube 250*250 150*300 300*300 200*300

Square tube 400*400 200*400 500*500 400*600

A square tube is a hollow square cross-section lightweight, thin-walled steel tube, also known as a steel refrigeration bend profile. It is a square cross-sectional shape and size steel made of Q235 hot-rolled or cold-rolled strip or coil as the base metal, formed by cold bending, and then welded by high frequency. In addition to the thickening of the wall thickening, the corner size and edge straightness of the hot-rolled extra-thick wall square pipe reach or even exceed the level of resistance welded cold-formed square pipe.

Extended content: The process flow of the production tube:

Material selection--- material inspection--- material warehousing--- roll extrusion forming--- straightening --- operation inspection, intermediate inspection--- heat treatment--- mechanical property inspection--- chemical analysis--- tensile test--- finished product warehousing--- finished product inspection--- product warehousing.

Galvanized square pipe specification table:

Have you seen these, galvanized water pipe model and size comparison table, are you interested in learning it?

The hot-dip galvanizing specifications are for your reference, for example, 40*40*, is a whole piece of 100 pieces, and 50*100 is a whole piece of 32 pieces.

There are many types of galvanized square pipe specifications, but the specifications commonly used in the square pipe industry are also obvious. Therefore, in the process of production and manufacturing, the square pipe factory will also focus on production with some commonly used specifications, unless it is specially customized. Usually the usual production specifications are: