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There are various classification methods for steel, and the main methods are as follows: 1. Classification by quality  (1) Ordinary steel (P ≤ 0.045%, s ≤ 0.050%)  (2) High quality steel (P and s ≤ 0.035%)  (3) High quality steel (P ≤ 0.035%, s ≤ 0.030%) 2. Classification by chemical composition  (1) Carbon steel: A. low carbon steel (C ≤ 0.25%); b. Medium carbon steel (C ≤ 0.25 ~ 0.60%); c. High carbon steel (C ≤ 0.60%).  (2) Alloy steel: A. low alloy steel (total content of alloy elements ≤ 5%); b. Medium alloy steel (total alloy element content >…

Titanium is a polycrystalline metal. Below 882 ℃, it is a crystal form. Its atomic structure is a close packed hexagonal lattice. From 882 ℃ to the melting point, it is B crystal form and a body centered cubic lattice. Industrial pure titanium presents a phase in the metallographic structure. If the annealing is complete, it is an equiaxed single lattice with basically equal size. Due to the existence of impurities, there is also a small amount of B phase in industrial pure titanium. It is basically distributed along the grain boundary. Industrial pure titanium according to GB / t3620…

ModelTypesCharacteristicUse301(17cr-7ni)Austenitic steelCompared with 304 steel, the content of Cr and Ni is less, the tensile strength and hardness are higher during cold working, non-magnetic, but magnetic after cold working.Train, aircraft, conveyor belt, vehicle, bolt, spring, screen301L(17Cr-7Ni-0.1N)Austenitic steelOn the basis of grain boundary, the corrosion resistance of steel 301 is improved; The strength deficiency caused by the reduction of C content is compensated by adding N element to ensure the strength of the steel.Railway vehicle frame and exterior decoration materials304(18Cr-8Ni)Austenitic steelAs a widely used steel, it has good corrosion resistance, heat resistance, low temperature strength and mechanical properties; Stamping, bending and…

In recent years, transparent PP has developed rapidly. In 2013, the domestic consumption reached 700000 tons, accounting for about 4% of the total PP. In 2016, the total apparent consumption of PP in China has reached 21 million tons, of which the consumption of transparent PP has also increased to 1.2 million tons, becoming one of the fastest-growing PP products. In the United States, almost all ordinary PP manufacturers are producing transparent PP resin, and the development speed of transparent PP products is 7% - 9% higher than that of ordinary PP products. In Japan, the annual output of transparent…

ABS material has excellent comprehensive performance, hard, shiny and easy to color. It is widely used in various fields and can be called the "king of Almighty" in the plastic industry. 1、 Introduction to ABS materials ABS is a polymer composed of acrylonitrile a, butadiene B and styrene s. 1,3-butadiene can provide low temperature ductility and impact resistance for ABS; Acrylonitrile provides ABS with hardness, heat resistance, acid and alkali resistance and other chemical corrosion properties; Styrene can provide ABS with hardness, processing fluidity and product surface finish. In terms of morphology, ABS is an amorphous material, which has many…

Angle steel: weight per meter = 0.00785 * (side width + side width - side thickness) * side thickness Round steel: weight per meter = 0.00617 * diameter * diameter (rebar and round steel are the same) Flat steel: weight per meter = 0.00785 * thickness * side width Pipe: weight per meter = 0.02466 * wall thickness * (outer diameter - wall thickness) Plate: weight per meter = 7.85 * thickness * width Brass tube: weight per meter = 0.02670 * wall thickness * (outer diameter - wall thickness) Copper pipe: weight per meter = 0.02796 * wall thickness…

1. Allowable burr height of punching parts (1) limit value of burr of blanking parts It is not allowed that the burr of blanking parts exceeds a certain height. The limit value of burr height of stamping parts (mm) is shown in the table below.  (2) marking requirements for burrs in design drawings *Burr direction: burr side. *Parts requiring burring: coin or coin continue. Generally, do not press all the burrs on the fracture of the whole structural member, which will increase the cost. Try to use it in the following situations: the fracture exposed to the outside; Sharp edges…