2-inch stainless steel pipeAbout job characteristics and the existence of risk factors

announcer:hp717HP127443542 release time:2022-03-23 10:27:34

The cold working process performance and cold forming performance are much better than that of ferritic stainless steel.

Prepare materials and tools, prepare corresponding materials and tools and check whether they match and apply.

.Austenitic stainless steel can be used to manufacture stainless spring, clock spring and steel wire rope in aviation structure after deformation strengthening. If welding is required after deformation, spot welding process and deformation can only be used to increase the tendency of stress corrosion

Under plasma arc cutting corrosion conditions, there are dust containing other metal elements or attachments of dissimilar metal particles on the surface of stainless steel. In the air, the condensate between the attachments and stainless steel connects them into a micro battery,Price of stainless steel pipe, which causes electrochemical reaction and the protective film is affected, which is called electrochemical corrosion.

.From the perspective of metallography, because stainless steel contains chromium, a very thin chromium film is formed on the surface, which is separated from the corrosion resistance of oxygen invaded in the steel.

In order to protect the welding pool well with argon and facilitate the welding operation, the center line of tungsten electrode and the workpiece at the welding position shall be kept 80 ~ 85° Angle, the included angle between filler wire and workpiece surface shall be as small as possible, generally 0-DEG; about.

The steady creep rate is usually used to evaluate the long-time creep performance of materials. For the application of long-life materials, the steady-state creep rate of stainless steel pipe under high temperature and stress is the key index of the material, and can be extrapolated. The following are the test results of stainless steel pipe under different test conditions. The results show that the steady-state creep rate of stainless steel pipe sample is in the order of magnitude after creep at 550 ℃ (90mpa600 ℃ (85mpa) for 500h; when the temperature condition increases to 650 ℃ (the stress decreases to 70MPa), the creep performance of stainless steel pipe sample is good, and creep fracture occurs. See for the change of steady-state creep rate of stainless steel pipe sample under several conditions. When the temperature increases, the material maintains a low level of creep rate. Under 650 ℃ 70MPa, which shows little influence on the temperature and stress, and creep fracture occurs under this condition Compared with several other common structural materials, it can be seen that the creep performance of several materials is better than that of ordinary materials under all test conditions. After 500 hours of test, the total strain does not exceed 0.12%. The curve is relatively stable and the fluctuation is small, indicating that the test data is stable and reliable. Stainless steel pipes are widely used because of their excellent corrosion resistance It is widely used in petrochemical industry, pipeline transportation and other working conditions with strong corrosive media. The main reason for the corrosion resistance of stainless steel pipes is the addition of a large number of elements CrNi, and Cr is the main element determining the corrosion resistance of stainless steel pipes. The electrode potential of stainless steel pipes jumps with the increase of Cr content. However,Stainless steel quality, stainless steel pipes are in the subsequent heat treatment During the treatment, Cr element will precipitate into the matrix in the form of carbide. On the one hand, the hardness of Cr carbide is larger than that of the matrix, and the service wear process can improve the wear resistance of stainless steel pipe. On the other hand, the precipitation of Cr containing carbide will lead to Cr Element dilution zone in some parts of the matrix, increase the number of batteries of the material, reduce the electrode potential of stainless steel pipe and reverse the corrosion Therefore, in order to obtain good corrosion and wear resistance, the combination of mechanical properties and corrosion resistance of stainless steel pipe materials needs to be considered. At present, some scholars have studied the effects of austenitizing temperature and time, tempering temperature and time on the mechanical properties of stainless steel pipe by heat treatment to change the corrosion resistance of stainless steel pipe And corrosion resistance, it is found that austenitizing temperature can change mechanical properties, but has little effect on corrosion performance, while tempering temperature has a great effect on the corrosion resistance of materials. Appropriate austenitizing temperature and tempering temperature can improve the corrosion and wear resistance of materials. Some scholars use surface treatment to improve the corrosion and wear resistance of materials, It is concluded that low-temperature nitriding forms a diffusion layer on the surface of the material, improves the wear resistance of the material, interacts with Cr and chemically stable phase 07-fe3n to improve the corrosion resistance of the material.


2-inch stainless steel pipeAbout job characteristics and the existence of risk factors



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

Model 303 & mdash; Add a small amount of sulfur and phosphorus to make it easier to cut.

The power supply with vertical external characteristics is adopted, and the positive polarity is adopted in DC (the welding wire is connected to the negative pole).

knowledge.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,Stainless steel plate laminating machine, from the current situation of China's stainless steel foreign trade China's stainless steel export has encountered great resistance.

Corrosion resistance most stainless steel products require good corrosion resistance. Stainless steel pipe is similar to class I and II tableware, kitchen, water heater, water dispenser, and determine the weight loss to determine the degree of corrosion.

The steel strip can be delivered without heat treatment under the condition that all properties meet the standard requirements. Ordinary drawing grade steel strip is allowed to be delivered without heat treatment.


2-inch stainless steel pipeAbout job characteristics and the existence of risk factors



  SPCDSPCD—& mdash; Cold rolled carbon steel sheet and strip for stamping wash and dry the solution is to drain, equivalent to China 08Al (1323) high quality carbon structural steel.

quality index.  ≥205TS(Mpa)

High frequency welding high frequency welding: with relatively high power supply, it can reach a higher welding speed for steel pipes with different materials, outer diameter and wall thickness. Compared with argon arc welding, it is more than ten times its high welding speed. Therefore, stainless steel pipes for common use have a higher consumption rate. Due to the high speed of high frequency welding, it is difficult to remove burrs in welded pipes. At present, high frequency welding Welded stainless steel pipe can not be borne by chemical and nuclear industries, which is also one of the reasons.

4: stainless steel strip (stainless steel coil): or coil, coil, coil, plate coil. There are many names, and the hardness of the strip varies from dozens to hundreds. The customer needs to determine which hardness to use first. (8K mirror luminosity)

.Mechanical properties when the steel or sample is stretched, when the stress exceeds the limit, even if the stress is no longer increased, the steel or sample continues to have obvious plastic deformation, which is called yield, and the small stress value when the yield phenomenon occurs is the yield point.

It has excellent stress corrosion cracking resistance. Even duplex stainless steel with low alloy content has higher stress corrosion cracking resistance than austenitic stainless steel, especially in the environment containing chloride ions. Stress corrosion is a prominent problem that ordinary austenitic stainless steel is difficult to solve.

6 Density 400 & rdquo; Density of series: 93310s, ferrite, martensite, duplex (ferrite austenite) stainless steel cold rolled coil and stainless steel hot rolled coil.