Stainless steel material.
316L is a molybdenum-containing stainless steel. Because the steel contains molybdenum, the overall performance of this steel is better than 310 and 304 stainless steel. Under high temperature conditions, when the concentration of sulfuric acid is lower than 15 or higher than 85, 316L stainless steel has a wide range of uses. 316L stainless steel also has good resistance to chloride corrosion, so it is usually used in marine environments.
Characteristics of 316L stainless steel
1) The cold-rolled product has good gloss and beautiful appearance;
2) Due to the addition of Mo, the corrosion resistance, especially the point resistance Excellent corrosion resistance;
3) Excellent high temperature strength
4) Excellent work hardening (weak magnetism after processing)
5) Non-magnetic in solid solution state ;
6) Compared with 304 stainless steel, the price is higher.
Extended information:
The corrosion resistance of 316L stainless steel is better than that of 304 stainless steel, and it has good corrosion resistance in the pulp and paper production process. Moreover, 316L stainless steel is also resistant to corrosion from the ocean and corrosive industrial atmosphere.
316L stainless steel has good oxidation resistance in intermittent use below 1600 degrees and continuous use below 700 degrees. In the range of 800-1575 degrees, it is best not to use it continuously. 316L stainless steel, but when 316L stainless steel is used continuously outside this temperature range, the stainless steel has good heat resistance. The resistance to carbide precipitation of 316L stainless steel is better than that of 316 stainless steel, and it can be used in the above temperature range.
Solid solution annealing is performed in the temperature range of 1010-1150 degrees, and then rapidly cooled. 316L stainless steel cannot be hardened by heat treatment. 316L stainless steel has good welding properties. Welding can be carried out using all standard welding methods.
When welding, 316Cb, 316L or 309Cb stainless steel filler rods or welding rods can be used for welding according to the purpose. In order to obtain the best corrosion resistance, the welded section of 316 stainless steel needs to be annealed after welding. If 316L stainless steel is used, post-weld annealing is not required.
The origin of stainless steel:
The invention and use of stainless steel can be traced back to the First World War. British scientist Henry Brearley was commissioned by the British Government Military Arsenal to study the improvement of weapons. At that time, the rifle bores used by soldiers were very easy to wear, and Brearley wanted to invent an alloy steel that was not easy to wear.
The stainless steel invented by Brearley obtained a British patent in 1916 and began mass production. Since then, stainless steel accidentally discovered in garbage dumps has become popular all over the world. Henry Brearley is also known as "Stainless Steel father". During World War I, British guns on the battlefield were always shipped back to the rear because the barrels were worn and unusable. The military production department ordered Brearley to develop high-strength and wear-resistant alloy steel to specifically study and solve the wear problem of the gun bore.
Brearley and his assistants collected various types of steel and alloy steel with different properties produced at home and abroad, conducted performance experiments on various machines with different properties, and then selected the more suitable ones. Guns are made from steel. One day, they experimented with a domestic alloy steel containing a large amount of chromium. After a wear-resistant test, they found that this alloy was not wear-resistant, indicating that it could not be used to make guns. So, they recorded the experimental results and threw them into the corner. thing.
One day a few months later, an assistant came to Brearley excitedly with a piece of shiny steel and said: "Sir, this is Mr. Maura I found when I was cleaning out the warehouse. Would you like to experiment with the alloy steel that was sent to see what special effects it has?" "Okay!" Bradley said happily, looking at the bright and dazzling steel.
The experimental results prove that it is a piece of stainless steel that is not afraid of acid, alkali and salt. This kind of stainless steel was invented by Mullah in Germany in 1912. However, Mullah did not know what the use of this stainless steel was.
Brillie thought in his mind: "This kind of steel that is not wear-resistant but corrosion-resistant cannot be used to make guns. Can it be used to make tableware?" He went ahead and made stainless steel fruits. Knives, forks, spoons, fruit plates and folding knives, etc.
Baidu Encyclopedia-316L Stainless Steel