Products
P265GH Plate A516 Gr 70
Product introduction
A516 Gr 70 steel plate is a carbon steel plate that meets the ASTM A516 standard. It is based on carbon steel and contains appropriate amounts of manganese, sulfur, phosphorus and other elements. It has good strength and toughness, a minimum yield strength of 260 MPa, and a tensile strength range of 485-620 MPa. This steel plate is mainly used in the chemical, energy, petroleum, natural gas and other industries to make the shell and bottom plate of equipment such as storage tanks, heat exchangers and reactors.
Product Characteristics
Plate A516 Gr 70 Chemical Composition
|
Grade |
C max |
Mn |
Si max |
P max |
S max |
|
EN10028-2 P265GH |
0.2 |
0.8-1.4 |
0.4 |
0.025 |
0.015 |
EN10028-2 P265GH Pressure Vessel And Boiler Steel Plate Mechanical Property
|
Grade |
Tensile Strength(MPa) |
Yield Strength(MPa) min |
% Elongation in 2 in.(50mm) min |
Impacting Test Temperature(°C) |
|
EN10028-2 P265GH |
390-530 |
265 |
22 |
+20,0,-20 |
Product features
High Strength
A516 Gr 70 steel plate has a minimum yield strength of 260 MPa and a tensile strength range of 485-620 MPa, showing excellent strength. This high strength is mainly due to the carbon content of approximately 0.27% in its composition. Carbon element can significantly improve the hardness and tensile properties of steel. The principle can be understood as follows: carbon atoms act as "fillers" in the crystal structure of steel, preventing internal sliding of the material, thereby improving the steel's resistance to external forces. . This mechanism enables the steel plate to exhibit extremely strong resistance to deformation under high pressure conditions. For example, in boilers and pressure vessels that are subject to high pressure, the high strength of steel plates can reduce the possibility of rupture and deformation due to excessive pressure.
Good Welding Performance
The tensile strength of A516 Gr 70 steel plate can still reach more than 470 MPa during welding, and the welding is well fused without obvious cracks. This is because sulfur and phosphorus are the main impurity elements that are prone to thermal cracking during welding, and the sulfur content of A516 Gr 70 is less than 0.035%, and the phosphorus content is less than 0.04%, which greatly reduces the possibility of cracking during welding. This performance is particularly suitable for welding pressure equipment with complex structures, such as multi-layer storage tank welding, which can ensure that the weld and the base material have consistent strength, thereby ensuring the overall reliability of the equipment.
High Temperature Resistance
In the high-temperature test, after continuous operation for 100 hours in an environment of 400°C, the yield strength of the A516 Gr 70 steel plate only dropped by about 5%, and the tensile strength remained above 470 MPa. This high-temperature resistance is due to the hot-rolling process, which refines the grain structure of the steel plate. Grains can simply be understood as tiny "particles" inside a material. The smaller these particles are, the more boundaries they have. The boundaries prevent the microscopic sliding that occurs when the material is stressed, thereby increasing the strength of the steel plate. This allows the equipment to maintain structural stability under long-term high-temperature conditions. For example, when used in the manufacture of shells for high-temperature and high-pressure boilers in the power industry, this performance can reduce the risk of equipment damage caused by thermal expansion and significantly improve the safety and operating life of the equipment.
FAQs
Q: What are the surface treatment methods for A516 Gr 70 steel plate?
A: The steel plate is usually treated with sandblasting, polishing and coating. Sandblasting can remove the oxide scale and impurities on the surface, providing better adhesion for subsequent coatings; polishing improves the surface finish and helps prevent the expansion of surface microcracks; coating further improves corrosion resistance by isolating oxygen and moisture. These surface treatment methods make the steel plate suitable for chemical storage tanks and coastal equipment, extending the service life of the equipment and reducing the frequency of maintenance.
Q: Can A516 Gr 70 steel plate be normalized?
A: Yes, normalizing is a common heat treatment method that is suitable for A516 Gr 70 steel plate. By heating the steel plate to about 900℃ and then cooling it evenly, normalizing can refine the grains and improve the mechanical properties of the material, including strength, toughness and fatigue resistance. This process is particularly suitable for equipment parts that require higher performance requirements, such as the shell of a heat exchanger or a high-pressure boiler.
Q: Is A516 Gr 70 steel plate resistant to fatigue?
A: A516 Gr 70 steel plate performed well in high-cycle fatigue tests, with no obvious cracks after 100,000 cycles of loading. This is due to the uniformity of its grain structure and low impurity content, which can maintain stability in an environment with repeated pressure changes. This fatigue resistance is very important in oil pipelines and chemical pressure vessels to ensure the reliability of long-term operation of equipment.
Q: Does A516 Gr 70 steel plate have anti-magnetic properties?
A: Because its main component is carbon steel, A516 Gr 70 steel plate is not completely non-magnetic, but its weak magnetic properties have no effect on most applications. If anti-magnetic properties are required, they can be treated by applying anti-magnetic coatings or using non-magnetic alloys. In some special application scenarios, such as electromagnetic equipment housings, magnetic interference can be avoided through design optimization.
Q: How does A516 Gr 70 steel plate perform in marine environments?
A: In marine environments, A516 Gr 70 steel plates can effectively resist salt spray corrosion after being treated with sandblasting and anti-corrosion coatings. Tests show that its corrosion rate is more than 50% lower than that of ordinary carbon steel. In addition, the low sulfur and phosphorus content reduces the possibility of pitting corrosion, making it an ideal choice for marine engineering equipment and ship tank shells, significantly improving the durability and reliability of the equipment.
Q: What should be paid attention to in the transportation and storage of A516 Gr 70 steel plates?
A: When transporting and storing A516 Gr 70 steel plates, avoid contact with moisture or acidic substances to prevent surface oxidation or corrosion. The steel plates should be stored in a dry and ventilated environment and covered with moisture-proof materials. For steel plates that need to be stored for a long time, a layer of anti-rust oil can be applied in advance to ensure that the surface integrity is maintained before being put into use. Reasonable storage methods can extend the service life of steel plates and reduce the additional cost of pre-processing.
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