L stainless steel pipe has become a very popular material in the market because of its many advantages. Today, Xiaobian will tell you in detail about L stainless steel pipe installation technology.
SPHCSPHC—& mdash; In the first place, s is the abbreviation of steel, P is the abbreviation of plate, h is the abbreviation of hot heat, which can be used to determine the hardness of very thin metal materials and surface layers. It has the main advantages of Brinell and Rockwell methods and overcomes their basic disadvantages, but it is not as simple as Rockwell method. Vickers method is rarely used in steel pipe standards.
(II) The price of steel has been running at a low level. From January 31 to June 2012, 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 application range is wider than that of ferritic stainless steel. Compared with ferritic stainless steel duplex stainless steel has the following disadvantages: high alloy element content and relatively high price. Generally, ferritic stainless steel does not contain nickel.
L stainless steel pipe is a kind of hollow long round steel, which is mainly used for industrial transmission pipelines and mechanical structural components such as petroleum, chemical industry, medical treatment, food, light industry, machinery and instruments, etc. In addition, when the bending and torsional strength are the same, the weight is light, so it is also widely used in all kinds of manufacturing mechanical parts and engineering structures.
Prepare materials and tools, prepare corresponding materials and tools, and check whether they match and apply.
It is a kind of product manufacturing enterprise. It has long been specialized in L stainless steel pipe s stainless steel pipe and 904L stainless steel pipe. Therefore, the specification of a group of slightly larger formed pipes used in the production of pipe molds is about 6000-20000.
After molten steel casting, stainless steel pipe fittings generally adopt the same vertical, vertical bending or arc continuous caster as carbon steel. The refined molten steel is poured into the ladle, the ladle to be poured is transferred above the tundish mouth through the rotary table, and then the molten steel is tundish through the long nozzle. The molten steel in tundish enters the mold through the submerged nozzle for forming, condensation and continuous downward movement.
Stainless steel pipe will rust? Stainless steel pipe is a food grade stainless steel pipe recognized by the state. It is not absolutely non rusting, but it is not easy to rust compared with other steel grades. Many people will think that the stainless steel pipe is not rusty, especially the stainless steel pipe has high nickel content, which is more difficult to rust. If it is rusty, they will doubt whether it is fake, whether it will be replaced by 201 stainless steel pipe, or there is a problem with the raw materials of the steel strip. In fact, these questions and judgments are one-sided views on the lack of understanding of stainless steel pipes. Stainless steel pipes may also produce rust and rust spots under certain conditions.
query.Since last year, foreign countries have frequently carried out & ldquo; Double inverse & rdquo; This has a great impact on China's stainless steel casting industry. Export is a large part of the development of China's stainless steel industry and occupies a huge market share in its industrial development. In the face of the current economic downturn and slow development speed, the development of China's stainless steel industry should continuously improve product quality, Better develop overseas trade and deal with trade protectionism, energy resources and cultural environment and improve the competitiveness of stainless steel products. Only in this way can we achieve an invincible position in foreign trade.
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.
With the development of social economy, the application of stainless steel pipe has been more and more popular. It will bring new changes in various fields.
The inner and outer surfaces of steel pipes shall be free of cracks folds, cracks crazing, rolling folds, delaminations and scabs. These defects shall be completely removed (except for pipes for machining). After removal, the wall thickness and outer diameter shall not exceed the negative deviation. Other minor surface defects that do not exceed the allowable negative deviation may not be removed.
Recommendation and consultation.Corrosion fatigue resistant dual phase steel has high corrosion fatigue strength due to its high strength and corrosion resistance. Processing equipment is vulnerable to corrosive environment and loading cycle, and its characteristics are very suitable for such applications. The chemical composition of was determined after 1900 DEG/ 1922° After f (1040 & deg; / 1080 & deg; c) solid melt annealing, the ideal microstructure 50 & alpha/ 50 γ . If the temperature of heat treatment is higher than 2000 DEG; F, which may lead to the increase of ferrite composition. Like other duplex stainless steels, alloys are susceptible to intermetallic precipitation. Intermetallic phase at 1300 DEG; F and 1800 & deg; F, at 1600 & deg; At temperature F, the precipitation rate is fast. Therefore, we need to test to ensure that there is no intermetallic phase. Refer to ASTM A 923 for the test. For hot forming, we suggest that the forming should be at 600 DEG; Below F. During hot forming treatment, the whole workpiece shall be heated as a whole, which shall be at 1750 DEG; F to 2250 & deg; F, and the alloy is very stable at this temperature. If the temperature is too high, the alloy is prone to hot tearing. Below this temperature, austenite will fracture. Below 1700 DEG; At F, the intermetallic phase will be formed quickly due to the influence of temperature and deformation. After hot forming, it should be immediately adjusted to 1900 DEG; F and quench to restore its phase balance, toughness and corrosion resistance. We do not recommend stress relief, but if this is necessary, the material should be as low as 1900 & deg; F, followed by rapid cooling and water quenching.
The domestic prospect is promising, and there is a large demand for building water supply pipes. According to the 'Ninth Five Year Plan' of construction and the outline of long-term objectives in 2010, the demand for each pipe is 500000 ~ 600000 km from 2001 to 2010, including 400000 km of cold and hot water pipes in residential construction areas. Some people believe that the development of stainless steel water pipes is of great significance to improve the grade of modern urban buildings.
The Chinese brand of stainless steel plate is 0cr18ni12mo3ti (0Cr18Ni12Mo2Ti with paper should also be this brand). The new brand is 06cr17ni12mo2ti stainless steel plate. The stainless steel plate is added with Ti in SUS316 steel to improve the intergranular corrosion resistance. It is applied to the equipment of, phosphoric acid, Xiaobian will tell you in detail about L stainless steel pipe installation technology.
409— Cheap model (British and American), usually used as automobile exhaust pipe, is ferritic stainless steel (chromium steel).
The heat-treated alloy should be 1900 DEG at low temperature; Annealing treatment at the temperature of F, then rapid cooling and water quenching. This treatment is applied to solid melt annealing and stress relief. Stress relief treatment, such as below 1900 DEG; F