The vast majority of stainless steel products require good corrosion resistance, like one or two types of tableware, kitchenware, water heaters, drinking fountains, etc. Some foreign businessmen on the product also do corrosion resistance test: NACL aqueous solution heated to boiling, pour off the solution after a period of time, wash and dry, weigh the loss, to determine the degree of corrosion (Note: the product polishing, because of the composition of the sand cloth or sandpaper containing Fe, will lead to test (when the surface rust spots)
Stainless steel products in today’s society are generally polished in the production process, only a few products such as water heaters, water dispenser lining, etc. do not need polishing. Therefore, this requires the polishing performance of raw materials is very good. The main factors affecting the polishing performance are the following.
① raw material surface defects. Such as scratches, pockmarks, over acid washing, etc..
② raw material material problems. Hardness is too low, polishing is not easy to polish bright (BQ sex is not good), and hardness is too low, in deep drawing surface prone to orange peel phenomenon, thus affecting the BQ sex. High hardness of BQ sex is relatively good.
③ after deep drawing of the product, the surface of the area of great deformation will also be small black spots and RIDGING, thus affecting the BQ sex.
Heat resistance performance refers to the high temperature stainless steel can still maintain its excellent physical and mechanical properties.
The impact of carbon: carbon in austenitic stainless steel is strongly formed and stable. Fixed austenite and expand the austenite zone of the element. The ability of carbon to form austenite is about 30 times that of nickel, and carbon is an interstitial element that can significantly improve the strength of austenitic stainless steel by solid solution strengthening. Carbon can also improve the austenitic stainless steel in highly concentrated chloride (such as 42% MgCl2 boiling solution) in the performance of stress and corrosion resistance.
When the amount of chromium in the steel atomic number of not less than 12.5%, can make a sudden change in the electrode potential of steel, from the negative potential to a positive electrode potential. Stop electrochemical corrosion
6.Stainless steel in architecture
A modernist architectural structure using the concept of exterior curtain wall. 1948, an office building in Schenectady, New York, with stainless steel decorative facade, so that the constant load on the facade is significantly reduced, thus allowing an additional floor without changing the original frame and foundation structure. 1950s in North America and other parts of the world there are many examples of the use of stainless steel curtain wall. For example, the Thyssenhaus in Düsseldorf, Germany, is one of the high-rise buildings in Europe using stainless steel. Trapezoidal curtain wall thickness of only 1.0mm No. 4 surface SS316 stainless steel decoration, is a building with a guide. Also, the high technology style Lloyd’s of London built in 1986 also used stainless steel curtain wall, so that the building’s artistic achievements continue to this day.
stainless steel is a very strong and durable material, with high strength and high ductility, completely impervious to water, he requires little or no maintenance, easy to form and weld. These unique properties are particularly suitable for roofs, whether flat, sloping, arched or curved. He can be colored with resin paint, as widely used in Japan for roofing, can also be hand-made or standard profiles made of uncoated metal roofing, many residential buildings, commercial buildings, municipal buildings and industrial buildings, stadiums and churches have been equipped with stainless steel roofing, many of which are decorated into a curved shape, increasing the artistic appearance of the building.
in the 1980s, in the United Kingdom first produced a lentil-shaped pattern of stainless steel flooring sheet as an alternative to corrosion-resistant carbon steel. Since then, due to the appearance, cleanliness, ease and frequency of cleaning (sometimes requiring chemical cleaning), the limitations of the sanitary environment and cost, stainless steel flooring has been used in many different industries, food processing plants, slaughterhouses, industrial and chemical plants, hospitals, motor rooms, and even commercial buildings, offices and railway stations are paved with stainless steel flooring, increasing the practical function of the building The flooring is made of stainless steel. Electro-polished stainless steel flooring has minimal potential to harbor bacteria and dust, and is particularly suitable for use in high-tech factories and food processing areas, where maintenance costs are low, making stainless steel the ideal material of choice.
7.stainless steel building case
Len Lye Museum / New Plymouth, New Zealand
With the completion of the Len Lye Museum, known as the most beautiful steel modern building in the world, the small city of New Plymouth, located at the southernmost tip of New Zealand’s South Island, has attracted a lot of attention from the global architectural community. The building’s facade is made of highly polished 316-gauge steel with an artistic curvilinear shape. The building resembles a shimmering beacon, which attracts the attention of all those interested in steel for the architecture, building and construction industry.
II. Chrysler Building / New York, USA
If we turn back the history to 1930, the then watchers were equally amazed by the dazzlingly beautiful roof panels of the Chrysler Building in New York, which was the first time ever to use stainless steel as decorative panels in a main building. What’s even more remarkable is that the roof of the Chrysler Building has only been serviced and cleaned three times in the past 87 years – in 1961, 1996 and 2001. And daily household cleaners were used. The inspection found the roof to be in excellent condition.
Three: Two Horses Sculpture (Scotland)
The Two Horses sculpture, 30 meters above the Firth and Clyde Canal in central Scotland, should be considered the most impressive piece of public art in the world. Scottish sculptor Andy Scott’s giant double horse head design was inspired by the old canal. The main contractor for the project, SH Structure, Inc. The head of the sculpture is made of 150 tons of 6 mm thick glossy 316L (S31603) stainless steel plate supplied and cut by Otokunp. A special lighting treatment is the finishing touch to the sculpture, providing a dramatic twin horse sculpture at night. The double horse sculpture was originally designed along an artistic perspective, but later in the collaboration, through a combination of traditional manufacturing techniques and excellent structural engineering, it successfully transformed into an outstanding work of public art.