14/04/2015

Why stainless steel will rust?

When the stainless steel surface appears brown rust (points), people great surprise: that "Stainless steel will not rust, rust is not stainless steel, the steel may be a problem." In fact, this is a lack of understanding of the stainless steel one-sided view of the error. Under certain conditions, the stainless steel will rust.

Stainless steel has the ability to resist the atmospheric oxidation of a stainless steel that is, while also having the ability to corrosion in acid, alkali, salt corrosion medium that.

But its size is corrosion resistance of steel itself with its chemical composition, mutual status, conditions of use and environmental media type change. Materials such as 304, in a clean dry atmosphere is absolutely excellent corrosion resistance, but move it to the waterfront area in the sea mist contains a lot of salt, will soon rust. Therefore, not any kind of stainless steel, corrosion resistant at all times, not rusty.

Stainless steel is a very thin layer formed on the surface by its fine and robust stabilized chromium-rich oxide film (pellicle), to prevent the infiltration of oxygen atom continues, continuing

Obtained by oxidation of the corrosion resistance. Once there is some reason, such a film being continuously damaged, air or liquid and will continue to infiltrate oxygen atom or a metal atom of iron was isolated out continuously, to form a loose iron oxide, the metal surface will be constant rust.

This takes many forms damaged surface film, everyday common are the following categories:

A stainless steel surface deposit savings contain dust or other metallic elements heterogeneous metal granule attachments, in the humid air, condensate and stainless steel fixtures between the two together into a micro-cell, causing the electro chemical reaction protective film is damaged, call it that electro chemical corrosion.

2, stainless steel surface adhesion of organic matter juice (such as vegetables, soup sputum, etc.), in the case of water oxygen to form organic acids, organic acids long is the formation of corrosion of metal surfaces.

3, stainless steel surface adhesion containing acid, alkali, salts (such as wall decoration alkaline, lime spray test) cause localized corrosion.

4, the polluted air (containing large amounts of sulfide, oxide, hydrogen peroxide atmosphere), the case of the condensate, to form sulfuric acid, nitric acid, acetic acid solution point, causing chemical corrosion. Above may damage the stainless steel surface protection film, causing corrosion. Therefore, in order to ensure a permanent bright metal surface, not rusty, we recommend:

① must often decorative stainless steel surface cleaning scrub, remove the attachments, eliminate corrosion caused by external factors.

② now have a 201 and 202 stainless steel materials in the coastal areas prone to rust on the market, suitable for use in the absence of industrial air pollution and corrosive environments.

③ waterfront areas should use 304 stainless steel, 304 resistant to seawater corrosion.

(Refer from Foshan Ocean stainless steel CO.,LTD-http://www.fsoceansteel.com/)

13/04/2015

Antibacterial stainless steel industrial scale trial production success

Recently, a researcher at the Chinese academy of sciences institute of metal Ruibin long led the research team cooperation with the domestic stainless steel enterprises, through the design and optimization of antibacterial stainless steel smelting and processing technology, successfully produced 40, 304 - ton scale copper antibacterial stainless steel flat products.

Produce antibacterial stainless steel plate width is 1200 mm, 2.5 mm, 1.0 mm and 0.8 mm and 0.5 mm and 0.4 mm thickness, control the thickness tolerance + / - 0.03 mm.

This batch of antibacterial stainless steel plate in the content is on the basis of conventional mechanical properties, by the technical institute of physics and chemistry of the Chinese academy of sciences of antibacterial performance, excellent antibacterial properties. In addition, the harmful metal ion release, cell toxicity, such as human security, China's food and drug verification research institute testing results show that the antibacterial stainless steel sheet completely in line with the scope of safety requirements stipulated by the state.At home and abroad in recent years, many bacteria such as e. coli infection of collective poisoning phenomenon, has brought people great panic, and caused great economic losses. At home and abroad especially in the "SARS", avian flu outbreaks of infectious diseases such as pathogenic bacteria, but also strongly shocked the Chinese people. People want to live in more and more clean and beautiful environment, and those who need to work in a clean environment in the workplace (hospital, pharmacy, food processing, kitchen, etc.) will be put forward higher requirements on the surrounding environment. The emergence of antimicrobial stainless steel to meet the needs of daily environment on the antibacterial, it is through the existing stainless steel material to add just the right amount of antibacterial metallic elements, such as copper (Cu), silver (Ag), etc., make the whole stainless steel produces a strong, broad spectrum and durable antibacterial function.

Ruibin long team in our country the earliest developed austenitic, ferrite, martens tic, and equal to the double structure of a series of new antibacterial stainless steel materials, they have the double characteristics of structure material and function of antibacterial material concurrently, can be used as structure materials and decoration materials, but also have the self-cleaning bactericidal or bacteriostatic function.

The success of antibacterial stainless steel industrial scale trial production, has marked the large-scale application of antibacterial stainless steel materials At present, there have been many household appliances and daily necessities enterprise carries on the preliminary cooperation, and metal products including antibacterial stainless steel sink, stainless steel air conditioning tray, antibacterial stainless steel tableware, stainless steel washing machine drum, antibacterial stainless steel stainless steel surgical instruments, orthopedics implant products. The future with the public gradually antibacterial stainless steel products is bound to attract more enterprises to participate in the market promotion and application of antibacterial stainless steel, to create a more extensive considerable economic benefits and social benefits.

 

Above information is provided by one of  the professional stainless steel sheet manufacturers-Foshan Ocean Stainless Steel Co. Ltd.If you have any questions,pleased contact us.

08/04/2015

Nickel prices affect corporate profits stainless steel

Stainless steel as one of the main varieties of steel in our country has a wide range of USES in the national life. And according to futures daily understanding, since the third quarter of last year, stainless steel product prices, and high prices of raw materials such as nickel, stainless steel market of profitable domestic enterprises is less than twenty percent. It is understood that due to the current domestic futures market rebar, hot-rolled coils, wire rod, steel futures varieties of price movements and the stainless steel price is not completely consistent, relevant stainless steel enterprises in the process of hedging with these varieties can't completely to hedge risk.300 series stainless steel products, in particular, the nickel content is higher, and the variety of the domestic market and there is no corresponding do hedge.

However, market participants believe that with the approaching of the nickel domestic futures market, this problem could be solved effectively. Comprehensive utilization of nickel and stainless steel production enterprises can steel futures varieties and nickel futures varieties combination hedge risk completely. Yesterday by guotai junan futures and Shanghai steel union electronic commerce co., LTD. Jointly organized the "nickel futures listing seminar" in 2015, baosteel stainless steel co., LTD., chief analyst at Yao Qizhong said, as the main steel grade of stainless steel, 300 series stainless steel and nickel content above 8%, and related enterprises have used varieties hedging objective requirements. The entire previous period color metal department Mr. Zhang has to be listed on Friday at the meeting of nickel, tin, futures contracts. According to introducing, nickel futures contracts traded deposit charge proportion is temporarily set at 7% of the value of the contract, we tentatively for 5%.Tin futures contracts traded deposit charge proportion is temporarily set at 5% of the value of the contract, we tentatively for 4%.Hang dish on the margin we tentatively scheduled for the amplitude of the we 2 times (no more than hang dish benchmark that nickel plus or minus 10%, tin no more than hang dish benchmark price plus or minus 8%).Delivery warehouses, Mr. Zhang introduces, at present the previous specified by nickel warehouses for six, including one in warehouse and five eastern China warehouse in Shandong district. The specified tin futures delivery warehouse also has six, including 2 in Guangdong areas, four in east China. The total capacity is 18000 tons." As a result of the tin ingot and nickel plate unit value is higher, freight value relative to its minimal proportion between the areas, so no discount area Settings." Mr. Zhang said. Registered brand, according to introducing, the Yunnan tin in Yunnan, guangxi China tin, wind and Kay union enterprise four industry production of tin in got has been successfully registered in the previous period. Another six nickel production enterprise has also become the registered brand of the previous period.Mr. Zhang said, there are several is under examination and approval process, nickel, tin, production enterprises registered enterprise continues to increase. Website public information display of the previous period, nickel, tin, futures contracts will begin at 9 a.m. on March 27.Nickel, tin, futures varieties, hang dish in contract for July 2015 to March 2016, the trading time and listed non-ferrous metals futures varieties. Nickel, tin, hang dish benchmark price of futures contracts will be announced today." We will be according to the industry fundamentals, the spot market quotation and overnight LME prices comprehensive consideration, determining the hang dish benchmark." Mr. Zhang said.

 

Above information is provided by one of the professional stainless steel sheet manufacturers,If you have any questions,pleased contact us.