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304 is a versatile stainless steel, it is widely used to produce good overall performance requirements (corrosion resistance and formability) of equipment and parts. 304L is a low carbon 304 stainless steel variant, for the need for welding applications. Lower carbon content makes it close to the weld heat affected zone to minimize carbide precipitation, and carbide precipitation may lead to intergranular corrosion of stainless steel in certain environments (welding erosion). 304N is a nitrogen-containing stainless steel, add nitrogen to increase the strength of steel. 304 about approximate number of steel 0Cr18Ni9, not to say that is entirely the same, stainless steel grades in many countries have their own definition of standards, there is little exactly the same, only say generally not bad, carefully control the words may have small differences. People often think that magnets stainless steel, verify their advantages and disadvantages and authenticity, do not attract non-magnetic, considered to be good, genuine; absorption by magnetic, it is considered counterfeit fakes. In fact, this is a one-sided, no practical method to identify errors. Magnetic is whether the rules by the molecular arrangement, with the decision, but the corrosion resistance is determined by many other factors, such as what the uniformity of it grains. So I think that the physical properties of the magnetic material, and corrosion resistance is chemical stability. Probably little correlation it, especially for the same material. He said stainless steel is non-magnetic is wrong. Ferritic stainless steel seems to be magnetic, and austenite is generally considered to be non-magnetic, but also may bring weak magnetism. There are several special stainless steel varieties are classified as "non-magnetic stainless steel", indicators are below a certain low remanence index, this is a more stringent magnetic minimal, that other general stainless steel may be more or Magnetic less. 304 stainless steel sample with magnetic landlord will be able to explain the problem, machining is possible to make the material with magnetic properties. The magnetic strip can be demagnetized demagnetized by a certain method. Stainless steel and acid generally collectively steel. Stainless steel is resistant to atmospheric means, steam and water and other weak medium corrosion of steel, and acid-resistant steel refers to acid, alkali, salt and other chemical etching medium corrosion of steel. Since the beginning of this century came, and now has 90 years of history. The invention of stainless steel is a major achievement in the history of the world's metallurgy, development of stainless steel for the development and technological progress of modern industry has laid an important material and technological foundation. Many stainless steel, different performance, it gradually formed a few categories in the development process. By organizational structure sub-divided into martensitic stainless steel (including precipitation hardening stainless steel), ferritic stainless steel, austenitic stainless steel and austenitic plus ferritic duplex stainless steel and other four major categories; by steel main chemical ingredient or Some of the features steel elements to be classified into chromium stainless steel, chrome-nickel stainless steel, chrome-nickel molybdenum stainless steel and low carbon steel, high molybdenum stainless steel, stainless steel and other high-purity; classification according to the performance characteristics and uses of steel, into nitric acid-resistant stainless steel , acid-resistant stainless steel, stainless steel pitting corrosion, stress corrosion resistant stainless steel, high-strength stainless steel; steel press features classified into low-temperature stainless steel, non-magnetic stainless steel, free cutting steel, stainless steel and other superplasticity. The most commonly used classification method is based on the characteristics of the organizational structure and chemical composition of steel as well as the characteristics of a combination of both methods of steel classification. Generally divided into martensitic stainless steel, ferritic stainless steel, austenitic stainless steel, duplex stainless steel and precipitation hardening stainless steel, or stainless steel and nickel-chromium stainless steel is divided into two categories. Stainless steel is generally used for anti-corrosive environments, as well as medical equipment and supplies. The so-called "stainless iron" is the recovered scrap metal, lead, steel melted by the second processing, through off "AIDS" treatment from the traditional detection method is to use the magnet, and this product using traditional methods can not distinguish of course, it is to deceive, and covered a large number of project selection, and therefore the Church one hundred emperor of the land into a construction site and a decoration, boarded a luxury but a curtain. This name is since the "Focus" exposure of birth, and occupies about 65% market share, while the real GB SUS304 stainless steel products due to higher prices and no market. The current market, "stainless steel iron" products can have a 65% share of its price plays an important role, is now the national standard stainless steel products per ton price of about 20,000 yuan, GB 7075 aluminum price per ton of approximately 1.6 the million or so, and "stainless iron" price is only 5000-7000 yuan per ton; and then look at these three materials tensile strength were: GB stainless steel 530-620MPa, GB 7075 aluminum alloy 540-560MPa, " stainless iron "160-180MPa. Apparently "stainless iron" has not yet reached the tensile strength of stainless steel 1/3 strength, is easily lead to accidents. Thus, in the construction industry, we must resolutely ban "stainless Iron" products. |
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Dongguan Zhuangyuan stainless steel water tower factory National service hotline:4008-3737-88 Address: Dongguan City, Da Lingshan Wan Long Road (large village) Dalingshan police brigade 200m E-mail:1651856382@qq.com No. QQ:1651856382 Tel:0769-81626031 Fax:0769-81626032 Phone:13326878298/13380111889 Contact:Mr. Chen Website:www.gdzystc.com |
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Analysis of the impact of air can heat pump energy-saving effect of several elements
Source： Time：2015-04-08 09:39:38 views：
304 is a versatile stainless steel, it is widely used to produce good overall performance requirements (corrosion resistance and formability) of equipment and parts.
304L is a low carbon 304 stainless steel variant, for the need for welding applications. Lower carbon content makes it close to the weld heat affected zone to minimize carbide precipitation, and carbide precipitation may lead to intergranular corrosion of stainless steel in certain environments (welding erosion).