Blogs/News/PSAs

 ASTM A709/A709M Standard Specification for Structural Steel for Bridges.

ASTM A709/A709M Standard Specification for Structural Steel for Bridges. ASTM A709/A709M specification covers carbon and high-strength low alloy steel structural shapes, plates and bars, and quenched and tempered alloy steel for structural plates intended for use in bridges. ASTM A709/A709M Standard main steel grade: ASTM A709 Grade 36, 50, 50S, 50W, HPS50W (A709GR36, A709GR50, A709GR50S, A709GR50W, A709GRHPS50W)

ASTMA709 -It's used in carbon steel for bridges and low-alloy high-strength structural steels, plates and rods.

1.The steel number is basically the same as the alloy structural steel.

2.For professional use of low-alloy high-strength steel, it should be marked at the end of the steel number. For example, for 16Mn steel, special steel grades for bridges are “16Mnq”, special grades for automobile girders are “16MnL”, and special steel grades for pressure vessels are “16MnR”.

• The main steelnumbers are: Q345E (16Mn) Q390E (15MnV) Q420E (15MnVN) Q460CSM490B St52-3 S275JR S355JR WH60A WH70B BB41BF BB503 CortenB SHT60 A633D A633E SM520 SM570 Q550CFC StE355 StE460 1E1006 1E0650 S275J0 S275J2 S275NL S355J0 S355K2 S355J2 S355NL NR400ZL A572Gr50 A588GrBA709Gr50.

• The main uses of steel plate include: manufacturing plant, general construction and various types of construction machinery, such as rigs, shovels, electric wheel dump trucks, mining vehicles, excavators, loaders, bulldozers, etc. Crane, coal mine hydraulic support and other mechanical equipment and other structural parts.

ASTM A709 steel plate is characterized by high strength and good welding performance. Although the general domestic high-strength steel has reached a certain strength to yield, but it has lost the hardenability, welding performance simply can not be compared with the American standard ASTMA709 steel. A709 gr 50 has high strength, even at very low temperatures, it can still maintain the mechanical a709 steel properties of the steel plate itself. Good fatigue resistance; high toughness and low brittle transition temperature; good cold forming performance and welding performance; good corrosion performance and certain wear resistance. Therefore, it cannot be replaced by the national standard steel plate, otherwise it will give the purchaser and the factory's manufacturing and processing a huge loss, causing economic disputes.

Microcrystalline wax is amorphous solid wax, also known as purified ground wax. It is prepared from vacuum residue by solvent deasphalting, solvent dewaxing, deoiling, refining, shaping, and packaging. Its chemical composition is less than normal alkanes. The main components are cyclic hydrocarbons with normal or isomeric alkyl side chains, especially naphthenic hydrocarbons. The larger the molecular weight, the higher the content of isomers and long chain alkanes. Microcrystalline wax has the characteristics of small hardness, good flexibility, and stress, and tends to plastic flow, high elongation, good flexibility, and strong gel strength. 。 With its unique properties, microcrystalline wax is widely used in emulsion explosives, rubber, hot melt adhesives, crayons for cultural and educational supplies, rubber mud, wax paper, ink, lubricant, paint, polishing, spinning wax, casting mold, electrical and electronic insulation, medicine, cosmetics, food, and food packaging, etc.

The appearance of microcrystalline wax is ruined or white. The basic chemical composition of microcrystalline wax is fewer n-alkanes. The main components are cyclic hydrocarbons with n-alkyl or Iso-alkyl side chains, especially naphthenes. The higher the molecular weight, the higher the content of isoalkanes and long side chain naphthenes. The number of carbon atoms is 21, the molecular weight is about 1, the melting point is 1, and the chemical properties are stable. Compared with paraffin wax, microcrystalline wax has a higher melting point and molecular weight, higher refractive index, relative density and viscosity after melting, and lower shrinkage and surface tension under the same hardness. Therefore, microcrystalline wax has the characteristics of low hardness, good flexibility, plastic flow under stress, large elongation and good flexibility. In addition, microcrystalline wax also has a strong gel strength for oil products.

KING HONOR INTERNATIONAL Ltd. has microcrystalline wax properties for sale business. Welcome to inquire.