Products
S550QL Astm A514 Steel Plate
Product introduction
S550QL ASTM A514 steel plate is a high-strength low-alloy (HSLA) structural steel that meets the standards of the American Society for Testing and Materials (ASTM). The "A" in "A514" indicates that the steel type is iron-based alloy steel, and "514" is its material number. The "S" in S550QL stands for structural steel, "550" indicates that its minimum yield strength is 550MPa, and "QL" refers to low-temperature toughness testing and quenching and tempering (Q&T) treatment. The material of this steel plate is based on carbon steel, with alloy elements such as chromium, nickel, and molybdenum added, and quenching and tempering treatment. The yield strength is as high as 690MPa and the tensile strength is 760-895MPa. It is often used in crane arms, large-span bridges, heavy transportation equipment, pressure vessels, etc.
Technical parameters
|
Chemical composition % max |
|||||||||||||||
|
Grade |
C |
Mn |
Si |
P |
S |
N |
B |
Cr |
Cu |
Mo |
Nb |
Ni |
Ti |
V |
Zr |
|
S550QL |
0.22 |
1.80_ |
0.86 |
0.025 |
0.012 |
0.016 |
0.006 |
1.6 |
0.55 |
0.74 |
0.07 |
2.1 |
0.07 |
0.14 |
0.17 |
EN10025-6 S550QL Carbon and Low-alloy High-strength Steel Plate Mechanical Property
|
S550QL Mechanical properties min |
||||||
|
Yield strength (Mpa) |
Tensile strength (Mpa) |
Elongation % |
||||
|
>3 ≤50 |
>50≤100 |
>100≤150 |
>3 ≤50 |
>50≤100 |
>100≤150 |
|
|
550 |
530 |
490 |
640-820 |
640-820 |
590-770 |
16 |
Product features
High Strength Performance
The yield strength of S550QL ASTM A514 steel plate is as high as 690MPa, and the tensile strength ranges between 760-895MPa, while the yield strength of ordinary structural steel is usually only 235-355MPa, and the tensile strength is around 400-550MPa, which is significantly more than twice as high. . This high strength comes from an optimized combination of its low-alloy composition, which contains approximately 0.40-0.50% chromium, 0.20-0.30% molybdenum and 0.50-0.80% nickel, as well as the quenching and tempering (Q&T) heat treatment process. The role of high temperature heating and rapid cooling. This characteristic makes steel plates particularly suitable for scenes that require high strength, such as bridges, crane arms, and heavy machinery.
Excellent Toughness
The impact toughness of S550QL ASTM A514 steel plate reaches a minimum of 27J at -40°C, which means that in the impact test, the steel plate can absorb 27 Joules (J) of energy without brittle fracture. In contrast, the impact absorption energy of ordinary structural steel below -20°C is usually less than 10J, so it is prone to brittle fracture. This feature significantly improves its safety and reliability in extreme environments. It is widely used in arctic construction, refrigerated storage equipment, and low-temperature oil and gas pipelines, etc., and can effectively reduce safety accidents caused by low-temperature fractures.
Excellent Welding Performance
The carbon equivalent (CE) of S550QL ASTM A514 steel plates is usually controlled between 0.47-0.60, giving it good welding performance. Welding performance refers to the ability of a steel plate to avoid cracks or deformation during the welding process while ensuring that the strength of the weld is close to the strength of the base metal. Carbon equivalent is an index to measure the weldability of steel, indicating the comprehensive content of carbon and other alloying elements in the steel that affect welding performance. When A514 steel plates are used to weld bridge structures, the tensile strength of the welds can reach more than 95% of the strength of the base metal. This excellent welding performance makes A514 steel plates particularly popular in the manufacture of complex structures and large equipment.
Excellent Wear Resistance
The surface hardness of S550QL ASTM A514 steel plate is in the range of 285-321HB (Brinnell hardness), which is higher than the approximately 150HB level of ordinary structural steel, significantly improving its wear resistance. The service life of wear-resistant parts made of A514 steel plates in mining machinery is usually more than twice that of ordinary carbon steel, reducing equipment downtime caused by wear.
FAQs
Q: What is the chemical composition of ASTM A514 steel plate?
A: ASTM A514 steel plate is mainly composed of alloy elements such as carbon, manganese, chromium, molybdenum, and nickel. Among them, the carbon content is usually controlled between 0.12%-0.21%, the manganese content is 0.95%-1.50%, and the chromium and molybdenum contents are around 0.40% and 0.20%, respectively. The combination of these elements improves the strength, hardness and toughness of the steel plate, while ensuring good weldability and processing performance.
Q: What is the thickness range of ASTM A514 steel plate?
A: The thickness of ASTM A514 steel plate is usually between 6mm and 50mm, and special customized specifications can reach more than 100mm. Steel plates of different thicknesses are suitable for different engineering needs, such as thinner steel plates for light structures, while thicker steel plates are suitable for heavy equipment with large loads.
Q: What is the density of ASTM A514 steel plate?
A: The density of ASTM A514 steel plate is 7.85g/cm³, which is the same as ordinary structural steel. Despite the unchanged density, its high strength properties allow for thinner steel plates to be used when carrying the same load, thus achieving lightweight design and reducing overall weight and cost.
Q: How is the corrosion resistance of ASTM A514 steel plate?
A: ASTM A514 steel plate has certain corrosion resistance, especially when chromium and nickel are added, which can improve its corrosion resistance in humid environments or mildly corrosive conditions. However, when exposed to acidic or salt spray environments for a long time, additional coating protection is usually required.
Q: What is the heat treatment process of ASTM A514 steel plate?
A: ASTM A514 steel plate adopts quenching and tempering (Q&T) treatment process. The steel plate is first heated to 880℃-900℃, rapidly cooled to form a hardened structure, and then tempered at a temperature of 580℃-650℃ to release internal stress and improve toughness and processability. This process optimizes its mechanical properties, making it suitable for a variety of harsh environments.
Q: How does the wear resistance of ASTM A514 steel plate perform in actual applications?
A: Actual cases show that the wear life of parts made of ASTM A514 steel plates in mining equipment is usually more than twice that of ordinary structural steel. For example, the lining plate used for ore transportation can reduce the replacement frequency by 50%, significantly reduce maintenance costs and improve the operating efficiency of equipment.
Q: What are the typical uses of ASTM A514 steel plates?
A: ASTM A514 steel plates are widely used in scenes requiring high strength and durability, such as bridge structures, heavy machinery and equipment, mining machinery, pressure vessels, and cryogenic oil and gas pipelines, especially in projects with strict requirements for load-bearing capacity and weight optimization.
Q: What is the low-temperature resistance of ASTM A514 steel plates?
A: The impact toughness of ASTM A514 steel plates can reach a minimum of 27J at -40℃, and the ductility retention rate exceeds 80%. This feature makes it particularly suitable for extreme low-temperature scenes such as Arctic buildings, frozen storage equipment, and cryogenic oil and gas pipelines, which can effectively prevent brittle fracture and improve the safety and durability of the structure.
Q: What is the welding performance of ASTM A514 steel plates?
A: Despite its high strength, ASTM A514 steel plate achieves good welding performance by controlling the carbon equivalent (CE) between 0.47-0.60. When welding, a preheating temperature of 150℃-200℃ and a heat input range of 1.5-2.5kJ/mm can be used to prevent cracks and ensure that the weld strength is close to that of the parent material, which is suitable for welding complex structures and large components.
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