Cold drawn (rolled) seamless steel pipe: round billet → Heating → Perforation & rarr; Lead & rarr; Annealing & rarr; Pickling → Oiling (copper plating) → Multi pass cold drawing (cold rolling) → Blank tube & rarr; Heat treatment & rarr; Straightening & rarr; Hydrostatic test (flaw detection) → Mark & rarr; Warehousing.
Difference between L stainless steel pipe and stainless steel pipe: and L stainless steel are molybdenum containing stainless steel. The molybdenum content of L stainless steel is slightly higher than that of stainless steel. Due to the molybdenum in the steel, the overall performance of this steel is better than that of and stainless steel. Stainless steel has a wide range of applications under high temperature conditions when the concentration of is lower than 15% and higher than 85%. In addition, stainless steel also has good chloride corrosion performance, so it is usually used in marine environment. The large carbon content of L stainless steel is 0.0, of course, it is better to spend less under feasible conditions. For goods such as stainless steel pipes, we can often see that there will be packaging film bags on them. Although they are not heavy, if there are a large number of single purchases, they will also produce certain economic expenses, but why do many people clearly dislike this thing on stainless steel pipes, But I have to accept it. Next, xincoral Xiaobian will tell you why stainless steel pipes need packaging bags.
7. Distinguish between 316L and 304L. There are two kinds of commonly used stainless steel 30316l (or corresponding to the German / European standard 430844036l,Stainless steel cylinder with cover, the main difference in chemical composition between 316L and 304 is that 316L contains Mo, and it is generally recognized that 316 has better corrosion resistance than 304 in high temperature environment. Therefore, engineers generally choose 316L parts in high temperature environment. However, 316L should not be used at any higher temperature! No However, this is a big problem. People who study mechanics have all studied threads. Remember a black solid agent that needs to be applied to prevent threads from biting under high temperature: molybdenum disulfide (MOS), from which two conclusions are drawn: No:  Mo is indeed a high resistance material (know what crucible gold is melted in? Molybdenum crucible!).  : molybdenum can easily react with high valence sulfur ions to form sulfide. Therefore, no stainless steel is super corrosion resistant. In the final analysis, stainless steel is a steel with more impurities (but these impurities are more corrosion resistant than steel). If it is steel, it can react with other substances.
.(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
After hot rolling, it is subject to heat treatment and pickling treatment.
The product ground by the grinding belt.
Hot rolled belt, stainless steel etching belt, stainless steel stretching belt,304 stainless steel pipe welding method, stainless steel polishing belt, stainless steel soft belt, stainless steel hard belt, stainless steel medium hard belt, stainless steel high temperature resistant belt, etc.
Stainless steel has been used as a structural material for building new buildings and repairing historic sites for more than 70 years. Early designs were calculated according to basic principles. Today,309 stainless steel pipe, such as ANSI as of the American Society of civil engineers, are used
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 and an appropriate outer slope opening shall be opened at the same time to avoid damaging the sealing ring.
management.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).
The corrosion resistance of corrosion-resistant stainless steel plate mainly depends on its alloy composition (chromium, nickel, silicon, aluminum, manganese, etc.) And internal structure, 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.
409— Cheap model (British and American), usually used as automobile exhaust pipe, is ferritic stainless steel (chromium steel).
SPHESPHE—& mdash; Hot rolled steel plate and strip for deep drawing.
Safety and health.If packing is not required, it shall be indicated in the contract and will not bear the problem of scratching and scratching the surface of stainless steel pipe due to opening the packing bag.
When the stainless steel pipe with solid core welding wire is prefabricated the welded junction can usually be rotated for welding, and the ventilation is very easy. At this time, the blocking plate is usually used to block both sides of the welded junction in the pipe, and the bottom welding is carried out for the protection of ventilation (see Table 1), and the outside is blocked with adhesive cloth.
L is a model of stainless steel pipe, and its current use value and market demand are also very large. People who often pay attention to the price of stainless steel pipes will find that the price of stainless steel pipes fluctuates greatly, sometimes rising to an exaggerated degree, and sometimes falling to the bottom. Only after understanding the factors affecting the price of stainless steel pipe can we be keenly aware of the fluctuation of stainless steel pipe price and respond in advance. So what is the price of L steel pipe?
. — After that, the second widely used steel is mainly used in food industry and surgical equipment. Molybdenum is added to obtain a special corrosion-resistant structure. Because it has better chloride corrosion resistance than it it is also made & ldquo; Marine Steel & rdquo; To use. SS is usually used in nuclear fuel recovery units. Grade 1810 stainless steel generally meets this application grade.  Model 321 & mdash; Except that the risk of weld corrosion of the material is reduced due to the addition of titanium, other properties are similar.
However, stainless steel is relative, and it is just ordinary stainless steel. It's better not to use it in a particularly polluted environment. You can rest assured to use stainless steel pipes in your daily life.
Stainless steel pipe will rust? It will rust. The stainless steel pipe only means that it is not easy to rust, which does not mean that it will not rust. If it is placed in seawater, it will still be embroidered soon. It will not rust at room temperature. If it is in a high sulfate alkali environment for a long time, it will produce spot rust. It will not rust under normal circumstances, except in places with acid rain. Stainless steel pipe itself