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In order to ensure quality of welding, the welder training and exam, qualified mount guard.

Points, according to use thick walls of precision steel tube of general purpose and high temperature and high pressure, etc., the latter with tubes are often alloy steel, you need to consider and solve the problem of welding seam shrinkage crack in the welding process and Cold Drawn Steel Tubes the heat affected zone of tubing mechanical properties is not too big change due to welding operation effect.

When many people see: 304 stainless steel pipe is used in indoor or indoors? May think this is used in indoor is a good choice, of course, for this statement, correct or not, so to speak, why so? If adopted 304 stainless steel pipe is aluminium coated tubes the use of service pipe class, so, interior and interior is can use, because of the corrosion resistant performance is good, not easy to rust, is building water supply of high quality pipe.

Passivation is a kind of passive film, due to the effect of metal and oxide, the passive film on the metal surface is very thin, dense, good coverage, strong adsorption. Is usually a metal oxide, usually of metal oxide compound. It will be completely separate metal and corrosion media, prevent metal contact with the corrosive medium, to dissolve metal ground to a halt, passivity, anti-corrosion effect.

Jagged on the stainless steel pipes, currently on the market is not the same as the raw material price nature have high low, as a general consumer, how you tell the difference between 304 and 201 stainless steel pipe. Below small make up with the three methods, to teach you the difference between 304 and 201 stainless steel pipe:

304 stainless steel performance
304 stainless steel is magnetic, to the chemical, oil, air source, textile and food industries with high corrosion resistance and oxidation resistance.
It has good stretchability, the combination of low yield strength and high elongation, making it possible to processed into complex shapes, shape should immediately after full annealing measures).

For those goods need to use plastic turnover box for storage, turnover and transport companies, buy a batch of high quality plastic turnover box is very important. So, what features of high quality plastic turnover box should have? Have certain criteria. We believe that high quality turnover box should have the following three characteristics:

In the modern material industry, in order to transport more convenient, there are many tools, plastic turnover box is one of them. Many industries use plastic turnover box transportation, so also plays an important role in the process of transportation. The utilization rate of turnover box also require it of quality control in the process of production, but there will still plastic bulk containers be unqualified plastic turnover box, reasons are as follows:

Bí quyết sử dụng tiền trúng số để giàu càng giàu thêm

In the production and living, for the moment, we can not do without plastic turnover box. Since the invention of plastic products, plastic products more and more varieties, application field in geometric progression growth. Its plasticity is very strong, can produce a variety of appearance and shape of the products. Because the market competition, every enterprise has to drum spill pallet improve production efficiency and competitiveness.