< ): It is carbon structural steel (B/)
< r > < rr br : : < r/ br br(:/ br r : bb% % br r / >< r : r br br : : ) Steel pipe
This type of steel is generally smelted by a converter or an open hearth. Its main raw materials are molten iron and scrap steel. The sulfur and phosphorus content in the steel is higher than that of high-quality carbon structural steel, generally sulfur %. phosphorus%. The content of other alloying elements brought into the steel from raw materials, such as chromium, nickel and copper, generally does not exceed %. According to the composition and performance requirements, the grades of this type of steel are represented by steel grades such as B, B, B, etc.
< r >In the B standard, carbon structural steel is divided into four grades B according to metallurgical quality. The steel content of each grade is %. The difference lies in the carbon content and sulfur and phosphorus content. The carbon content of grade B is %~% and %~%, the carbon content of grade B is ≦%≦%, the content of [banned word] is the smallest, and the carbon content of grade B is the smallest.
< r >The note is the Chinese pinyin capital of the word "yield", the following number is the minimum yield point () value of the grade, and the following symbol [ is based on the impurity element (sulfur and phosphorus) content of the steel From high to low and accompanied by changes in carbon and manganese elements, it is divided into four grades: B.
< r >This type of steel has the largest output and is widely used. It is mostly rolled into plate shapes (round, square, flat, grooved, etc.) and special shapes, as well as the manufacture of welded steel pipes. Mainly used in factory buildings, bridges, ships and other building structures and general pipelines for transporting fluids. This type of steel is generally used directly without heat treatment.
< r >Steel pipes
are used to transport low-pressure fluids. Generally welded pipes are made of steel. It can also be made of other mild steels that are easy to weld. Steel pipes need to be subjected to experiments such as hydraulic bending and flattening, and have certain requirements for surface quality. The delivery length is usually 10,000 square meters, and it is often required to be delivered in fixed length (or multiple lengths). The specifications of welded pipes are expressed in nominal diameter (millimeters or inches). The nominal diameter is different from the actual. According to the specified wall thickness, there are two kinds of welded pipes: ordinary steel pipes and thickened steel pipes. < rr br : : < r/ br br(:/ br r : bb% % br r />
< r >Steel pipes can be used for various grinding tool handles and other unimportant grinding tool parts . Use steel as the punch material, and use it directly after quenching without tempering. The hardness is ~R, which solves the problem of the punch breaking during use.
< Microsoft Yahei, Blackbody B The difference between steel pipes and steel pipes The lower limit of the yield strength of point
< r > is, and the lower limit of the yield strength of is (the meaning is the Chinese character "qu", and the following value represents the lower limit of the yield strength)
< r >The alloy content of the two is different: Ordinary carbon steel, low alloy steel
< r >It is carbon structural steel, compared with the old standard B grade
< r >It is low alloy structural steel, compared with the old standard grade R
< r >Metal structural parts, carburized or cyanide parts with low core strength requirements, tie rods, connecting rods, hooks, couplers, bolts, nuts, sleeves, shafts and welding parts
< r >Good overall mechanical properties and low temperature performance Yes, with good plasticity and weldability. It can be used as structural mechanical parts that bear dynamic loads such as medium and low-pressure containers, oil tanks, vehicles, cranes, mining machinery, power stations, bridges, etc. Building structures are generally metal structural parts. They can be used in hot-rolled or normalized conditions and can be used in cold areas below ℃. Various structures
Supply [Q235] carbon structural steel, Q235 quotation price