A572 Gr.50 steel plate is a steel plate grade under American standards and is a type of low-alloy high-strength steel plate. At present, the strength requirements of steel plates are relatively high, but there are still requirements for thickness, so these high-strength steel plates came into being. For example, A572 Gr.50 steel plate adds a small amount of alloy elements inside the steel plate. After passing through a special heat treatment process, the strength and toughness of the steel plate can be partially improved to meet the requirements and can be used.
On the basis of carbon structural steel, appropriate alloying elements are added, and it is mainly used to manufacture steel for mechanical parts with larger cross-section sizes. It has suitable hardenability, high strength, toughness and fatigue strength, and low brittle transition temperature after corresponding heat treatment. This type of steel mainly includes quenched and tempered steel, case hardened steel and cold plastic formed steel.A572 Gr.50 implementation standard: ASTMA572/A572M.
SA572 Gr.50 reference standard:A6/A6M hot-rolled structural steel plate, A36/A36M carbon structural steel, A514/A514M section steel, steel plate general requirements. Carbon structural steel is suitable for welding with high yield strength quenched and tempered alloy steel plate, A588/A588M minimum yield point to 50ksi (345MPa) high-strength low-alloy structural steel resistant to atmospheric corrosion.
Chemical composition of A572 Gr.50 steel plate:Alloying element carbon C: 0.27～0.35;Alloying element silicon Si: 0.93～1.20;Alloying element nickel Ni: ≤0.029;Alloying element copper Cu: ≤0.025;Alloying element manganese Mn: 0.80～1.10;Alloying element sulfur S: ≤0.025;Alloy element phosphorus P: ≤0.026;Alloying element chromium Cr: 0.75～1.20.
Specifications of A572 Gr.50 steel plate: Thickness: 8mm~300mm Width: 1500mm~4200mm.
The thickness deviation of A572 Gr.50 steel plate should comply with the corresponding regulations of GB6654. Type N, A, B, C deviations.Type N deviation: positive deviation and negative deviation are equal.Type A deviation: Negative deviation determined based on nominal thickness.Type B deviation: Fixed negative deviation is 0.3.Category C deviation: fixed negative deviation is 0 and determines positive deviation according to nominal thickness.
Heat treatment of A572 Gr.50 steel plate: hot rolling, controlled rolling, normalizing, etc.N normalizing: heating the steel plate to a suitable temperature and then cooling it in the air.T tempering: The steel plate is kept warm at a certain appropriate temperature for a long time and then cooled.Q quenching: The steel plate is heated and kept warm and then quickly cooled in a medium such as water, oil or other inorganic salts.A Annealing: Heating the steel plate to the appropriate temperature and cooling it slowly depending on the material and specifications.A572 Gr.50 delivery status: hot rolling, controlled rolling, normalizing, etc.
A572 Gr.50 technical requirements: flaw detection, Z15Z35 thickness direction performance requirements, high strength and high toughness requirements for steel plates.
A572 Gr.50 supply specifications: 8-300mm thickness, can be fixed in length, width and rolling.
Hand arc welding of A572 Gr.50 steel plate is the earliest developed among various arc welding methods and is still the most widely used. It uses an externally coated welding rod as the electrode and filler metal, and the arc burns between the end of the welding rod and the surface of the workpiece to be welded. A572 Gr.50 steel plate coating can generate gas under the action of arc heat on the one hand to protect the arc, and on the other hand it can generate slag to cover the surface of the molten pool to prevent the interaction between the molten metal and the surrounding gas.
A572 Gr.50 steel plate This is a non-melting electrode gas shielded arc welding, which uses the arc between the tungsten electrode and the workpiece to melt the metal to form a weld. During the welding process of A572 Gr.50 steel plate, the tungsten electrode does not melt and only functions as an electrode. At the same time, argon or helium gas is fed into the nozzle of the welding torch for protection. Additional metal can be added as needed. Plasma arc welding of A572 Gr.50 steel plate is also a kind of non-melting arc welding. It uses a compressed arc between the electrode and the workpiece to achieve welding. The electrode used is usually a tungsten electrode. The plasma gas used to generate the plasma arc can be argon, nitrogen, helium or a mixture of the two. It is also protected with inert gas through the nozzle.
A572 Gr.50 steel plate usage:The 8~300mm thick A572 Gr.50 low-alloy high-strength structure is widely used in engineering structures, such as construction steel structures, construction machinery, mining machinery, trucks, bridges, pressure vessels, etc., especially for those requiring better strength and toughness. Construction and engineering machinery parts.
As a low-alloy high-strength structural steel plate, A572 Gr.50 steel plate has wide application prospects and important industrial value. By in-depth understanding of its performance indicators, uses and delivery status, we can better leverage its advantages and promote the progress and development of industrial production. At the same time, with the continuous advancement of technology and the expansion of application requirements, A572 Gr.50 steel plates are expected to play a more important role in the future and make greater contributions to the sustainable development of industrial production.