Stainless stee
Stainless steethe 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. [1] 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.
.Only soluble paper or the combination of soluble paper and blocking plate is used for blocking ventilation protection (i.e. solid core welding wire + TIG + water-soluble paper)
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.
.The process of this product determines its limited performance. Generally, the precision of seamless steel pipe is low: uneven wall thickness, low brightness on the inner and outer surface of the pipe, high sizing cost, and there are pockmarks and black spots on the inner and outer surface, which are not easy to remove; its detection and shaping must be processed offline. Therefore, it embodies its advantages in high pressure, high strength and mechanical structure materials.
409— Cheap model (British and American), usually used as automobile exhaust pipe,2205 duplex stainless steel pipe, is ferritic stainless steel (chromium steel).
When brown rust spots appear on the surface of stainless steel pipes, people will be surprised: & ldquo; Stainless steel pipes are not rusty. Is there a problem with the steel quality;. In fact, this is a one-sided wrong view because the understanding of stainless steel pipe is not comprehensive enough. You should know that stainless steel pipe will rust under certain conditions.
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).
Stainless steel grade group 200 Series & mdash; Chromium nickel manganese austenitic stainless steel 300 series & mdash; Chromium nickel austenitic stainless steel model 301 & mdash; 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.
The thickness of cold rolled steel strip is ultra-thin, and the thickness of hot rolled steel strip is large.
Product range.Stainless steel water supply pipe is a healthy, economic, sanitary and energy-saving water pipe whether it is for household or large engineering buildings
(III) steel exports grew rapidly. The supply and demand of domestic steel market is unbalanced, and the export of enterprises. From January to June, China exported 30.69 million tons of steel, a year-on-year increase of 6%; 6.83 million tons of steel were imported, down 8%, and 320000 tons of billets and ingots were imported, up 50%. Converting billets into crude steel, the cumulative net export was 25.06 million tons a year-on-year increase of 13%,304 stainless steel plate is well planted, accounting for 4% of China's crude steel output. In terms of export price, the average export price of bars and wires from January to June was 623 US dollars per ton, a year-on-year decrease of 18%; US $832 tons of plate, a year-on-year decrease of 8%.
The corrosion resistance of corrosion-resistant stainless steel plate mainly depends on its alloy composition (chromium, nickel, titanium,Stainless steel pipe welder, 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.
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, excellent quality and favorable price. Use letters to indicate composition content: for example, China and Russia use fixed digits to indicate steel series or numbers; for example, the United States, Japan, 300 series 400 series 200 series; the serial number is composed of Latin letters and order, which only indicates the purpose.
Bidding.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 cleaned up. If the sealing ring is damaged, 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.
.For 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, 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.
Seamless steel pipe belongs to the category with relatively high added value among steel pipe products, and the products involved in this case belong to the medium and high-end products of stainless steel pipe. According to incomplete statistics, in 2010, China exported about 20000 tons of stainless steel pipes to the EU, accounting for about 13% of the total exports of stainless steel pipes that year.