Xi 'an Dongmeng Steel Co., Ltd
The company with profound industry experience and extensive resources, constantly open up new markets, strive to build a complete material production base, always adhere to the "promise is gold, win
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2021 China Factory Supply Stainless Steel Round Bar Surface finish Vinegar white, 2B, bright
The invention and use of stainless steel dates back to the first World War. At that time, British guns in the field were always sent back to the rear with the bore worn out and unusable. The military production department ordered Brearley to develop high-strength wear-resisting alloy steel, specializing in solving the problem of the bore wear. Brearley and his assistants collected various types of steel produced at home and abroad, various properties of alloy steel, in a variety of different properties of machinery performance tests, and then select the more suitable steel to make guns. One day, they tested an alloy steel containing a lot of chromium. After the wear test, they found that the alloy was not wear-resistant, indicating that it could not be used to make guns. So they recorded the results of the experiment and threw them into a corner. One day, a few months later, an assistant came up to Brearley with a shiny piece of steel. "Sir," he said, "I found this alloy from Mr. Mullah when I was cleaning out the warehouse. Would you like to test it to see what special use it has!" "Good!" Brearley said happily, looking at the shining steel.
Experimental results show that it is not afraid of acid, alkali, salt stainless steel. The stainless steel was invented by a German mullah in 1912, but the mullah had no idea what it was for.
Brearley thought to himself, "Is it possible to make tableware out of this non-abrasive but corrosion-resistant steel, which cannot be used for guns?" He said dry dry, began to make stainless steel fruit knife, fork, spoon, fruit plate and folding knife.
Brearley's invention of stainless steel was patented in the United Kingdom in 1916 and mass production began. So far, stainless steel discovered accidentally in a rubbish dump became popular all over the world. Henry Brearley is also known as the "father of stainless steel".
| 200 series(Cr－Mn－Ni) | 201,202 |
| 300 series(Cr－Ni) | 301, 302, 304, 304l,309, 310(S), 316(L), 321, etc |
| 400 series(Cr) | 401,409, 410, 420j1,420j2,430,439,etc. |
Stainless steel bars are known best for their admirable features like high tensile strength, excellent corrosion resistance,
durability, workability, ductility, dimensional accuracy, and long service life. These round bars can easily withstand at high
temperature and pressure without getting damage while providing the best performance. These bars are available to customers
indifferent custom shapes and sizes as per their demand and requirement. With it, these bars are designed as per the national and
global specifications.
The main features
Folding weldability
The requirements for welding performance are also different for different product uses. A class of tableware on welding performance generally do not require, even including some pot enterprises. But the vast majority of products require good welding performance of raw materials, such as second-class tableware, thermos cups, steel pipes, water heaters, drinking machines and so on.
Folding resistance
The vast majority of stainless steel products for corrosion resistant performance is good, like a, 2 kinds of tableware, kitchen utensils and appliances, water heaters, water dispensers, etc., some foreign businessmen on corrosion resistance of products also do experiment: in NACL aqueous solution heated to boiling, after a period of time out solution, wash and drying, weight loss, to determine the degree of corrosion (note: the product polishing, Because Fe is contained in emery cloth or sandpaper, it will lead to rust spots on the test surface.)
Folding polishing property
Stainless steel products in today's society are generally polished when the production of this process, only a few products such as water heater, water dispener liner, do not need to be polished. So this requires that the polishing performance of raw materials is very good. The main factors affecting the polishing performance are as follows:
Surface defects of raw materials. Such as scratches, pitting, pickling and so on.
② The problem of raw materials. The hardness is too low, it is not easy to shine when polishing (BQ is not good), and the hardness is too low, it is easy to appear orange peel phenomenon on the surface when deep drawing, thus affecting BQ. BQ with high hardness is relatively good.
(3) After deep drawing, small black spots and RIDGING will appear on the surface of the products with great deformation, thus affecting the BQ property.
Folding heat resistance
Heat resistance refers to the high temperature stainless steel can still maintain its excellent physical and mechanical properties.
Influence of carbon: Carbon is an element that strongly forms and stabilizes austenite and enlarges the austenite zone in austenitic stainless steel. The ability of carbon to form austenite is about 30 times that of nickel. Carbon is a interstitial element, and the strength of austenitic stainless steel can be significantly improved by solution strengthening. Carbon also improves the stress and corrosion resistance of austenitic stainless steel in high concentration chloride (e.g. 42%MgCl2 boiling solution).
But, in the austenitic stainless steel, carbon is often seen as the harmful elements, this is mainly due to the corrosion of stainless steel used in some conditions, such as welding or heating by 450 ~ 850 ℃), carbon steel with chromium in forming high chromium Cr23C6 type carbon compounds which can lead to local chromium depletion, make steel corrosion resistance especially resistant to intergranular corrosion performance degradation. So. Since the 60 s of the development of new cr-ni austenitic stainless steel is mostly carbon content less than 0.03% or 0.02% of the ultra-low carbon type, you can know as the carbon content is reduced, the steel intergranular corrosion sensitivity is reduced, when carbon content less than 0.02% is one of the most obvious effect, some experiments also pointed out that the carbon will also increase the chromium austenitic stainless steel corrosion tendency. Due to the harmful effects of carbon, not only in the process of austenitic stainless steel smelting should be as low as possible according to the requirements of the control of carbon content, but also in the subsequent hot and cold processing and heat treatment process to prevent the surface of stainless steel carburization, to avoid chromium carbide precipitation.
Folding resistance
When the amount of chromium atom in steel is not less than 12.5%, the electrode potential of steel will change from negative potential to positive electrode potential. Prevent electrochemical corrosion.