345 stainless 
1018 stainlessFor the steel pipes bearing fluid pressure, hydraulic test shall be carried out to test their pressure resistance and quality. If there is no leakage under the specified pressure, or they are qualified. Some steel pipes shall also be subject to crimping test, also known as 188 stainless steel. It is characterized by high temperature resistance excellent processing performance and good toughness, so it is made into a frequently used steel. Common in life are stainless steel pipe, stainless steel plate, stainless steel coil and other building materials. As a very important building material, stainless steel is widely used in industry construction industry, home decoration industry and food and medical industry. It is one of the indispensable materials in life! So what items are made of stainless steel in our life? Let's have a look!
.Welding of stainless steel pipe argon arc welding stainless steel pipe: it is required to have deep penetration, no oxide inclusion, and the heat affected zone can be as small as possible. Argon arc welding maintained by tungsten inert gas has good compliance, high welding quality and good penetration function. Its commodities are widely used in chemical, nuclear and food industries.
440— High strength cutting tool steel, with slightly higher carbon content, can obtain higher yield strength after appropriate heat treatment, and the hardness can reach 58hrc. It belongs to hard stainless steel. A common application example is & ldquo; Shaving blade & rdquo;. There are three common models: 440C and 440f (easy to process).
.Usage: it is widely used in automobile industry, aviation industry and other departments.
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.
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.
·Cargo box of ship or truck & middot; Food processing equipment standard ASTM / ASME......... A240 UNS S3 / s31803euronorm......... 4462 x2crnimon 23afnor.................. Z3 CrNi 205 azdin.............................. W. NR 4462 corrosion resistance uniform corrosion due to chromium content (22%), molybdenum (3%) and nitrogen content (0
Some reasons for product composition ratio: in order to reduce the production cost, reduce the proportion content of some important elements such as chromium and nickel, and increase the content of other elements such as carbon. This production phenomenon that the composition ratio is not strictly in accordance with the product model and product characteristics not only greatly reduces the product quality, for example, when the chromium content of stainless steel pipe is insufficient, it not only affects the production The corrosion resistance and formability of products have potential product quality and safety hazards when they are used in chemical, equipment and production industries. At the same time,304 stainless steel head and tail plate, they also affect the appearance and oxidation resistance of products.
In the grades of Japanese steel (JIS Series), ordinary structural steel is mainly composed of three parts, which represent the material, such as s (steel) represents steel and f (ferrum) represents iron; The second part represents different shapes, such as P (plate) represents plate, t (tube) represents tube, and K (kogu) represents tool; The third part represents the characteristic number, which is generally low tensile strength. For example: SS400 & mdash& mdash; One s represents steel, and the second s represents & ldquo; Structure & rdquo; (structure), 400 is the lower limit tensile strength of 400MPa and the whole represents ordinary structural steel with tensile strength of 400MPa.
Service first.6 Density 400 & rdquo; Density of series: 93310s, 309S and 316316 density stainless steel coils of 30323042001 are divided into Austenitic, ferrite, martensite, duplex (ferrite austenite) stainless steel cold rolled coil and stainless steel hot rolled coil.
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.
5 identification number and indication use international chemical element symbols and national symbols to indicate chemical composition. For a long time, stainless steel plate, stainless steel coil, stainless steel belt and stainless steel pipe have complete products, China and Russia use fixed digits to indicate steel series or numbers; for example, the United States, Japan, 300 series, which only indicates the purpose.
SPCDSPCD—& mdash; Cold rolled carbon steel sheet and strip for stamping, equivalent to China 08Al (1323) high quality carbon structural steel.
Click to view.The surface of the steel strip in the state of supply shall be rough or bright.
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,Stainless steel rectangular tube, 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,How much is stainless steel, acid, alkali and corrosion resistance of stainless steel pipe are relatively good, 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.
）
.For the length of welding arc, 2 ~ 4mm is better for ordinary steel welding, and ~ 3mm is better for stainless steel welding. If it is too long, the protection effect is not good.
The method is that the heated tube blank is placed in a closed cylinder, and the perforated rod and rod move to extrude the part from the smaller die hole. This method can produce steel pipes with smaller diameter.
In addition, when selecting the reasonable thickness of the steel plate, its service time, quality and stiffness should be considered, and the strength requirements of the plate under pressure should be considered; Thermal conductivity; Distribution of pressure and format specification of pressing plate.