A573 Gr.70 is a carbon-manganese-silicon steel plate, mainly used to improve notch toughness at room temperature. A573 Gr.70 steel plate implementation standard: American Society for Testing and Materials standard, ASTM A573/573M-05.
The welding performance of A573 Gr.70 steel plate is better, which is mainly reflected in the following aspects: Low welding crack sensitivity: A573 Gr.70 steel plate has lower carbon content, lower sulfur and phosphorus content, so its welding crack sensitivity is lower. Cracks are less likely to occur during the welding process. High strength of welded joints: A573 Gr.70 steel plate has high yield strength and tensile strength, so the strength of its welded joints is also high, which can meet higher mechanical performance requirements.Strong welding process adaptability: A573 Gr.70 steel plate can be welded using a variety of welding methods, such as manual arc welding, submerged arc welding, gas shielded welding, etc., and has good welding process adaptability. It should be noted that when welding A573 Gr.70 steel plates, it is necessary to select appropriate welding materials and welding processes, and conduct sufficient preheating and postheating to ensure the quality of the welded joints. At the same time, attention must be paid to controlling welding deformation and stress during the welding process to avoid welding defects and cracks.
A573 Gr.70 steel plate surface quality requirements: The surface of A573 Gr.70 steel plate should not have bubbles, scars, cracks, folds, inclusions and pressed iron oxide scales that would affect the use of harmful defects. A573 Gr.70 steel plates should not have visually visible delamination. The surface of the steel plate is allowed to have thin layers of iron oxide scale and rust that do not hinder the inspection of surface defects, as well as inconspicuous roughness, reticulation, pitting, scratches and other local defects caused by pressing into the iron oxide scale and rollers, but their depth should not be Greater than half the tolerance of the steel plate thickness, and should ensure the minimum allowable thickness of the steel plate.Surface defects of the A573 Gr.70 steel plate are allowed to be removed by grinding and other methods. The cleaned area should be smooth and without edges and corners. The cleaning depth should not be greater than the negative deviation of the steel plate thickness, and the minimum allowable thickness of the steel plate should be ensured.
A573 Gr.70 steel plate production and cutting process:
Production process: primary refining → LF refining → VD treatment → continuous casting (die casting) → cleaning, heating → rolling → (stacking) → surface inspection → batch → flaw detection → heat treatment → cutting and sampling → performance inspection → warehousing.
Cutting process: After the A573 Gr.70 steel plate is shipped out of the factory and all performance indicators meet the requirements, it is carried out according to the cutting process. It can be cut and cut according to the drawing. Generally, when the thickness of the steel plate is not greater than 20mm, CNC plasma cutting or CNC laser cutting is preferred. If the thickness of the steel plate If it is larger than 30mm, CNC flame cutting is usually chosen, which can control cutting accuracy and time.
A573 Gr.70 steel plate delivery status: must be normalized A573 Gr.70 steel plate technical conditions: impact, flaw detection, Z-direction, composition control, performance requirements exceeding standards, etc. can be added when ordering.
The mechanical properties of A573 Gr.70 steel plate are tensile strength 485-620MPa, yield strength 290MPa, and minimum elongation 18%.
Chemical composition of A573 Gr.70 steel plate: C content 0.27-0.25; Mn content 0.85-1.20; P content 0.035; S content 0.004; Si content 0.15-0.40.
A573 Gr.70 steel plate is an American standard steel plate. It is mainly used to manufacture engineering structures and general mechanical structures. It is often used in the construction of bridges, ships, vehicles, pressure vessels, etc. Specifically, A573 Gr.70 steel plates can be used to manufacture the following equipment and structures: Bridges: A573 Gr.70 steel plates have high strength and toughness and can be used to manufacture the main beams, piers, decks and other structures of bridges. Ships: A573 Gr.70 steel plate has good welding performance and corrosion resistance, and can be used to manufacture hulls, cabins, decks and other structures. Vehicles: A573 Gr.70 steel plates can be used to manufacture vehicle frames, compartments, chassis and other structures.Pressure vessels: A573 Gr.70 steel plate has high strength and toughness and can be used to manufacture the cylinder, head, flange and other structures of pressure vessels. Others: A573 Gr.70 steel plate can also be used to manufacture other mechanical structures, such as lifting machinery, mining machinery, construction machinery, etc.
A573 Gr.70 steel plate should have a variety of high-quality properties and outstanding performance during use, thus gaining unanimous praise and recognition from the majority of users. With frequent use in the manufacturing industry and continuous optimization and upgrading of manufacturers, A573 Gr.702 steel plate has gradually become a domestic One of the commonly used steel plate grades.