an analyst at Zoomlion steel, pointed out that since,Stainless steel 304 stainless steel,Stainless steel mesh belt conveyor, China's steel pipe exports have been only 30000 or 40000 tons per month, of which seamless pipe exports are only about 10000 tons per month.
In view of the external export difficulties, on the one hand, China's stainless steel industry needs to improve, but it is important for China's stainless steel industry to continuously improve its quality level and comprehensively upgrade.
.Add a small amount of sulfur and phosphorus to make it easier to cut.
The shielding gas is argon with a purity of 999%. When the welding current is 50 ~ 50a,45# precision steel pipe, the argon flow is 8 ~ 0lmin, and when the current is 50 ~ 250A, the argon flow is 2 ~ 5lmin.
.The corrosion resistance of corrosion-resistant stainless steel plate mainly depends on its alloy composition (chromium, nickel, titanium 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.
2 physical properties chemical composition C: it is specified in, which is usually also called mo2ti or mechanical properties ys (MPA)
According to the steel structure, austenite ferrite ferrite martensite and precipitation hardening note: precipitation hardening (precipitation strengthening): refers to a heat treatment process in which the metal is hardened by the segregation zone of solute atoms in supersaturated solid solution and / or the desolved particles are dispersed in the matrix. For example, austenitic precipitated stainless steel can obtain high strength by precipitation hardening at 400 ~ 500 ℃ or 700 ~ 800 ℃ after solution treatment or cold working. That is, the supersaturated solid solution of some alloys is placed at room temperature or heated to more & amp; gt;& amp; gt;
In order to prevent the occurrence of welding pores, the welding parts must be cleaned if there is rust, oil stain, etc.
Typical ferritic stainless steels are Crl7, Cr25 and Cr28.
Stainless steel has the ability of atmospheric oxidation, that is, it does not rust. At the same time, it also has the ability of corrosion resistance in the medium containing acid, alkali and salt, that is, corrosion resistance. However, its corrosion resistance changes with its own chemical composition, mutual state, service conditions and environmental medium type. For example, 304 has absolutely excellent corrosion resistance in dry and clean atmosphere, but it is moved to In coastal areas, in the sea fog with a lot of salt, it will soon rust, while 316 stainless steel performs well. Therefore, not any kind of stainless steel can resist corrosion and rust at any time
Where is good.）
500 Series & mdash; Heat resistant chromium alloy steel.
Oxygen plus gas flame can not cut stainless steel plate because stainless steel is not easy to be oxidized.
Since the invention of stainless steel at the beginning of this century, stainless steel has integrated the image of modern materials and the excellent reputation in architectural applications, which makes its competitors envy. Stainless steel will not produce corrosion, pitting, corrosion or wear. Stainless steel is also one of the metal materials with high strength. Because stainless steel has good corrosion resistance, it can keep the integrity of engineering design of structural components. Chromium containing stainless steel also integrates mechanical strength and high extensibility, which is easy to process and manufacture parts, and can meet the needs of architects and structural designers.
how.The steel grades for JIS mechanical structures are: S + carbon content + letter code (CK), in which the carbon content is represented by the intermediate value & times; 100, and K: represents steel for carburizing. For example, 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 economic downturn and slow development, the development of China's stainless steel industry should constantly improve product quality, Better develop overseas trade and deal with trade protectionism, combine products with environmental protection, 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.
Because the family kitchen and are in the same environment for a long time the ordinary steel pipe will rust after being used for a period of time, the service life is not long, and it will affect the safety of family drinking water! Therefore, the use of stainless steel pipe here can ensure long-term non rusting, and the corrosion resistance and tensile resistance of stainless steel pipe itself. Professional stainless steel plate stainless steel coil, stainless steel belt, stainless steel pipe, safety, environmental protection and economy! The products are exported to foreign countries and are deeply trusted, which makes the stainless steel pipe more and more popular in the field of home decoration!
.Before connecting the pipe fittings, mark the depth on the pipe first, so as to prevent it from being inserted in place and stuck.
1 cold rolled oriented silicon steel strip (sheet) represents: 100 times of DQ + iron loss value (at the frequency of 50Hz, the magnetic induction peak with sinusoidal waveform is the unit weight iron loss value of 7T) + 100 times of thickness value. Sometimes G is added after the iron loss value to indicate high magnetic induction. For example, it must be cleaned up. If the sealing ring is damaged it must be replaced again.