Stainless steel plateQualified testing standards

announcer:hp717HP127443542 release time:2022-01-13 18:18:23

Before connecting the pipe fittings, mark the depth on the pipe first, so as to prevent it from being inserted in place and stuck.

Air pressure and water pressure test: conduct water pressure test for pressure resistant pipes one by one, f stainless steel, a stainless steel and A-F duplex stainless steel according to the microstructure of steel in normalized state.

When transporting domestic and drinking water, the pipeline shall not pass through the toxic pollution area. If necessary, protective measures shall be taken.

.Seamless stainless steel pipe also known as stainless steel pipe, is made of steel ingot or solid pipe blank through perforation, and then made by hot rolling, cold rolling or cold drawing. The specification of seamless steel pipe is expressed by outer diameter * wall thickness mm. With the implementation of China's reform and opening up, the national economy has achieved rapid growth, and a large number of urban houses, public buildings and tourism facilities have been built, which puts forward new requirements for hot water supply and domestic water supply. In particular, people pay more and more attention to the problem of water quality, and the requirements are also increasing. Galvanized steel pipe, a common pipe, will gradually withdraw from the historical stage under the influence of relevant countries because of its corrosivity. Plastic pipe, composite pipe and copper pipe have become common pipes in the pipeline system. However, stainless steel pipe has more advantages, especially the stainless steel pipe with wall thickness of only 0.6 ~ 2mm. In high-quality drinking water system, hot water system and water supply system that puts safety and sanitation first, it has the characteristics of safety, reliability, sanitation, economy and applicability. It has been proved by engineering practice at home and abroad that it is one of the new, energy-saving and environmental protection pipes with good comprehensive performance of water supply system. It is also a very competitive water supply pipe which will play an incomparable role in improving water quality and people's living standards.

Among the steel products exported by China, steel pipe has always been the focus of foreign anti-dumping and countervailing investigations. The Russian Ministry of industry and trade announced an anti-dumping investigation on China's cold-rolled stainless steel seamless steel pipes exported to the Russian Belarus Kazakhstan customs union. Before that, the Brazilian foreign trade chamber also said that it would impose an anti-dumping tariff of US $743 per ton (about RMB 4748 yuan) on China's steel pipe products, which is valid for five years.

For example, the raw material difference of the three materials, such as 20 and, which are common in the market, is more than 5000 yuan per ton.


Stainless steel plateQualified testing standards



  ·Oil and gas pipeline, heat exchanger and pipe fittings.

Refining and transportation industries are in great demand. Secondly, geological drilling, chemical industry, construction industry, machinery industry, aircraft and automobile manufacturing, boiler, medical equipment, furniture and bicycle manufacturing also need a large number of various steel pipes. With the development of new technologies such as atomic energy, rocket, missile and aerospace industry, stainless steel pipe plays an increasingly important role in national defense industry, firm, fine and stable chromium rich oxide film (protective film) formed on its surface. It prevents oxygen atoms from penetrating and oxidizing, and obtains corrosion resistance. Once this film is continuously damaged for some reason, oxygen atoms in the air or will continue to separate out, forming loose iron oxide. For a long time, stainless steel plate, stainless steel coil and stainless steel belt will be provided, Stainless steel pipe, a 20-year-old brand, has advantages in price and guaranteed quality! The metal surface is constantly corroded

original.In the past few years, the United States has imposed anti-dumping and countervailing duties on a variety of steel pipe products exported from China, including ring welded pipe, rectangular pipe, pipeline pipe welded stainless steel pressure pipe, oil well pipe and seamless steel pipe. These foreign double back pressures have greatly reduced the number of steel pipes exported by China.

(II) The price of steel has been running at a low level. From January 31 to June 2012, the overall performance of the domestic steel market was depressed. With the substantial release of crude steel production capacity, the market supply and demand fell into an imbalance, and the steel price entered a downward channel, which has been weak for more than four months. As of June 26, 2013, the steel price index had dropped to 100.48 points, lower than the first 6 points. The prices of eight steel varieties mainly counted by the iron and steel industry association were lower than the first 6 points

The two ends of the 6m long steel pipe are mechanically cut, and the pipe end is relatively sharp to prevent direct contact with the sealing ring of the pipe fitting. It is necessary to cut off a small section at both ends of the pipe or grind off the corner edge with a hand grinder and then clamp the pipe fittings.


Stainless steel plateQualified testing standards



After the pipeline is installed and the pressure test is qualified, it is better to wash with low chloride ion water and disinfect with 0.03% potassium permanganate.

Inspection items.The rolling of cold drawn (rolled) seamless steel pipe is more complex than that of hot rolled (seamless steel pipe). The first three steps of their production process are basically the same. The difference starts from the fourth step. After the round tube blank is emptied, it needs to be started and annealed. After annealing, pickling shall be carried out with special acid. After pickling, apply oil. Then it is followed by multi pass cold drawing (cold rolling) and special heat treatment. After heat treatment, it will be straightened.

Bidirectional Product Description: the tensile strength of the material is 980 ~ 1180mpa, it is divided into semi Ferritic and semi martensitic stainless steel pipe, martensitic stainless steel pipe, austenitic ferritic stainless steel pipe, etc.

[hot rolled strip / sheet] has the advantages of low hardness, easy processing and good ductility.

Relevant information stainless steel export is an important part of China's export economy. It plays an important role in stimulating China's economic growth. However from the current situation of China's stainless steel foreign trade, China's stainless steel export has encountered great resistance.