Q460GJC performance analysis of high construction steel
Q460GJC performance analysis
of high-rise steel 1, introduction to
Q460GJC steel plate 1, Q460GJC is widely used in high-rise building structures, buildings and bridges because of its good chemical, mechanical, physical and technological properties, and the material is also known as steel plate for high-rise building structures. In terms of chemical properties, it has certain corrosion resistance and high-temperature oxidation properties, and in terms of mechanical properties, it has high strength, plasticity and good toughness. In terms of physical properties, it is characterized by good thermal expansion, magnetism and electrical conductivity. In terms of process performance, it is characterized by good welding performance and good cutting performance.
2. Q460GJC steel plate grade indication: "Q": indicates the yield strength of the steel plate, and the first letter of the word "yield" in pinyin; "420": It is expressed as the point value unit of the steel plate, that is, 460Mpa, indicating that the pressure value of the steel plate can withstand is within 460Mpa; "GJ": It means that the steel plate is a steel plate for the steel structure building at a high place, and it is also the abbreviation of the first letter of the high construction pinyin GJ abbreviation "C": it indicates the level of the steel plate, and the low temperature impact test of -20 degrees.
3. Q460GJC steel plate implementation standard: implement the GB35012-2018 standard.
4. Technical standard for Q460GJC steel plate (1) Q460GJC size, shape, weight and allowable error description: The allowable error of the size, shape and weight of the steel plate is implemented according to the GB/T 709-2019 standard
, in which the thickness and weight are often asked. The thickness is performed according to Class B or C, and if there is no special instructions, it is usually performed according to Class B.
(2) The thickness deviation of Q460GJC shall be implemented according to Class B or Class C of GB/T709.
(3) Q460GJC the theoretical weight of the steel plate is delivered, and the thickness used in the theoretical weight is the arithmetic average of the maximum allowable thickness and the minimum thickness of the steel plate.
5. Q460GJC delivery status of steel plate: the steel plate is delivered in the normalized (allowed accelerated cooling) + tempering state, and the delivery status can also be specified according to the technical requirements. 6. Performance requirements for the thickness direction of Q460GJC steel plate: Q460GJC-Z15, Q460GJC-Z25, Q460GJC-Z35.
7. Q460GJC steel plate flaw detection requirements: one probe, two probe, three probe.
8. Q460GJC steel plate density: 7.85/cubic meter.
9. Q460GJC steel plate weight adjustment formula: thickness * width * length * density.
10. Conventional size of Q460GJC steel plate: 8-120mm*2000-2500mm*8000-10000mm
| Chemical composition |
| Tabulation: Depu Steel Date: 2024-01-18 |
| C |
Si |
Mn |
P |
S |
Cr |
Mo |
Cu |
| ≤0.2 |
≤0.55 |
≤1.70 |
≤0.025 |
≤0.015 |
≤1.2 |
≤0.5 |
≤0.5 |
Note:
(1): In order to improve the properties of steel, other trace alloying elements other than the above table can be added, and the data comes from the network and is for reference only.
(2): The allowable deviation of the chemical composition of the finished steel plate shall comply with the provisions
of GB/T222
Fourth, the characteristics
of the Q460GJC steel plate (1) can resist the damage of a certain seismic force, and must be shockproof and earthquake-resistant. For this purpose, the steel plate must not only have sufficient tensile strength and yield strength, but also have a low yield ratio. The low yield ratio can make the material have good cold deformation capacity and high plastic deformation work, absorb more seismic energy, and improve the seismic resistance of the building.
(2) It should have good welding performance, so that there is no need for preheating before welding, and no heat treatment is required after welding, so as to facilitate on-site welding, so as to reduce labor intensity and improve labor efficiency.
(3) It should have high plasticity and toughness, so that the steel plate has good mechanical properties.
(4) It should have a small fluctuation range of yield strength. When the yield strength varies widely, the matching of the yield strength between the various parts of the building may be different from the design requirements, which is easy to cause local damage and reduce the seismic resistance of the building. THEREFORE, THE JAPANESE STANDARD STIPULATES THAT THE YIELD STRENGTH FLUCTUATION RANGE IS NOT MORE THAN 120MPA.
(5) Within the scope of the beam and column joints connected by welding, when the joint constraints are strong and bear the tensile force along the direction of the plate thickness, the steel plate must have a certain level of resistance to layered tearing.
5. Classification
of high construction plate 1, high construction steel series: Q345GJC, Q345GJD, Q345GJE, Q370GJCDE-Q390GJCD, Q460GJCD series, etc
2. The grades of high-building plates are divided into five strength levels of yield point 235MPA, 345MPA, 390MPA, 420MPA and 460MPA, and each strength level is divided into Z and non-Z steel, Z steel has Z15, Z25 and Z35 three grades, and each grade is divided into quality grades according to different impact test requirements, and each grade has good welding performance.
6. Q460GJC steel plate thickness flaw detection to detect cracks or defects inside metal materials or components. Commonly used flaw detection methods include: X-ray flaw detection, ultrasonic flaw detection, magnetic particle flaw detection, penetration flaw detection, eddy current flaw detection, γ-ray flaw detection, fluorescence flaw detection, coloring flaw detection and other methods. Physical testing is the non-destructive testing of non-destructive testing without chemical changes. Non-destructive testing is a test method to check the surface and internal quality of the inspected parts without damaging the working condition of the workpiece or raw materials. On the premise of not damaging the material matrix, the detection of cracks or defects in the internal cracks or components of metal materials and components requires high stress requirements, mainly to ensure that steel plates with high requirements for different force directions such as high-rise bridges, as well as steel products with special stress directions such as rails. The steel plate that fails to pass the flaw detection has certain internal defects, and cracks and expansion will occur during welding. The internal defects are more serious, and the core of the steel plate is damaged first, and then extends to the entire thickness direction.
7. Production and cutting process of Q460GJC steel plate: production process: initial refining →LF refining→ VD treatment→ continuous casting (die casting) → cleaning, heating→ rolling → (stacking) → surface inspection→ batch → flaw detection→ heat treatment→ cutting sampling→ performance inspection → warehousing.
Cutting process: Q460GJC steel plate factory inspection of the performance indicators meet the requirements in accordance with the cutting process, can be cut processing and drawing blanking, the general thickness of the steel plate is not more than 20mm, the preferred choice of CNC plasma cutting or CNC laser cutting, if the thickness of the steel plate is greater than 30mm, usually CNC flame cutting will be selected, you can control the cutting accuracy and time.
8. Application scope of Q460GJC steel plate Q460GJC steel plate is mainly used in large-scale construction projects such as high-rise buildings, super high-rise buildings, large-span stadiums, airports, convention and exhibition centers and steel structure workshops.
