In view of the continuous vibration of stainless steel pipe shopping malls, even & ldquo; Roller coaster & rdquo; Market, stainless steel pipe market participants are implementing it carefully & ldquo; Fast forward and fast Exit & rdquo; Therefore, the national stainless steel pipeline inventory has been at a low level. High price various specifications of stainless steel plate, stainless steel coil, stainless steel belt and stainless steel pipe. Waste merchants, industrial companies, the social inventory of stainless steel pipes should progress with the progress of economic aggregate, and with the progress of total output and demand. However, stainless steel pipe inventory did not increase too much, or even did not increase, low-temperature equipment components in refrigeration industry, and can be used as stainless steel spring and clock spring after deformation strengthening.
The corrosion resistance of corrosion-resistant stainless steel plate mainly depends on its alloy composition (chromium, nickel, titanium, silicon, aluminum, manganese, which mainly acts on chromium. Chromium has high chemical stability can form a passive film on the steel surface, isolate the metal from the outside, protect the steel plate from oxidation and increase the corrosion resistance of the steel plate. After the passive film, the corrosion resistance decreases.
.The internal and external greasy dirt and sundries at the pipe end shall be completely removed to keep the pipe inside the pipe fittings clean.
Mechanical machinability in high-speed machine, the feed rate and cutting speed of alloy are the same as L. If carbonization is adopted, the cutting speed is reduced by about 20% compared with L. the performance of machinery and equipment and their components plays a key role here.
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.
However, some people will still communicate online or by telephone to ask whether the stainless steel pipe we produce can be used as a water pipe.
Editor's note on the causes of steel rusting: chloride ions exist widely such as salt, sweat stains, seawater, sea breeze, soil, etc. stainless steel corrodes rapidly in the presence of chloride ions, even surpassing ordinary low-carbon steel. Chloride ions form complexes with Fe in alloy elements, reducing the positive potential of Fe, and then being stripped of electrons and oxidized [1].
300 series & mdash; Chromium nickel austenitic stainless steel.
Discount.Check whether the sealing ring of pipe fittings is complete and clean and whether the placement position is correct. If there is dirt, it must be replaced again.
Check the clamping forming effect after each clamping, and there shall be no clamping in place or serious depression of pipe clamping. According to visual inspection, the pipe fitting end and the pipe are tightly bonded. The smaller the diameter of the diamond edge of the pipe fitting above DN25 is slightly smaller than the outer diameter of the pipe, ranging from 0.1-2mm. The larger the pipe diameter, the greater the difference.
303— Add a small amount of sulfur and phosphorus to make it easier to cut.
In the building water supply pipe system, since the galvanized steel pipe has ended its glorious history of one hundred years, various new plastic pipes and composite pipes have developed rapidly. The professional stainless steel plate stainless steel coil, stainless steel belt and stainless steel pipe have advanced technology, strict testing, more affordable price and more preferential treatment. Welcome to consult. However, there are still some deficiencies in various pipes to varying degrees, It is far from fully meeting the needs of water supply pipeline system and national requirements for drinking water and related water quality. Therefore, relevant experts: building water supply pipes will eventually return to the era of metal pipes. According to foreign application experience, stainless steel pipe is recognized as one of the pipes with good comprehensive performance in metal pipe. Chemical analysis: carry out chemical analysis on the chemical composition of the material, and the chemical composition meets the requirements
total cost. 301— Good ductility, used for molding products. It can also be machined to harden rapidly. Good weldability. The wear resistance and fatigue strength are better than those of stainless steel.
Decorative stainless steel pipe: usually the outer wall is relatively bright, so its name is considered. Decorative stainless steel pipe is used for decorative purposes. The stainless steel pipe for general decorative purposes is relatively thin. Because it is different from the manufacturing process of stainless steel product pipe, the price also varies greatly. The general production process of decorative stainless steel pipe is ordinary welded stainless steel pipe. Guangdong stainless steel product pipe stainless steel product pipe: generally, the surface of stainless steel product pipe is also a bright surface, and a small number of pipes with acid pickling industrial surface. As mentioned above, stainless steel product pipe belongs to the purpose of stainless steel products, because the outer diameter size, mechanical properties, acid, alkali and corrosion resistance of stainless steel pipe are relatively good, Therefore, stainless steel pipes are generally used as anti-corrosion materials or hardware products in large-scale production enterprises. The production process of stainless steel pipes is one-time forming, and nitrogen protection is also added during welding.
All decreased in varying degrees, with an average decrease of 7%. In terms of varieties, the prices of construction wire rod and rebar, which account for a large proportion of China's steel output, fell by 9% and 7% respectively, and the prices of medium and heavy plate and hot rolled coil fell by 7% and 7% respectively.
.Classification and grading of standards 4-1 classification: national standard GB industry standard Yb local standard enterprise standard Q / cb4-2 classification: product standard packaging standard basic standard 4-3 standard level (divided into three levels): y level: international advanced level I level: international general level H level: domestic advanced level 4-4 national standard stainless steel bar (level I) gb4241-84 stainless welding disc Park (level H)
The pipes for pipe cutting shall be professionally cut by stainless steel. Rotate it for two circles, then slightly tighten the piece, and then rotate it for two circles until it is cut off. It must not be enough to allow personal strength to be in place at one time to lock the piece to cut off the pipe, otherwise the pipe end will be cut off, and the pipe fittings or rubber rings cannot be inserted; After the pipe above DN65 is cut the internal and external burrs must be removed with a hand grinder, chemical fertilizer and chemical fiber, such as containers, pipelines and structural parts.