Q690D high-stress quality steel performance introduction, Q690D steel plate cutting, Q690D steel plate rolling
Q690D is a high-strength structural quenched and tempered steel with excellent mechanical and weldable properties. Its yield strength is about 690MPa and tensile strength is about 780MPa, which is widely used in construction machinery, mining machinery, construction machinery, shipbuilding and other fields.
The quality grades of Q690 are C, D, E, F, and the impact of D grade steel plate is 20°C. Q690D can be called a low-temperature resistant high-strength steel with a yield strength of 690MPa. Q690D steel plate has high yield strength and tensile strength, which is widely used in coal mining machinery, construction machinery, such as hydraulic supports, harbor cranes, flatbed trucks, executive standards: GB T1591-2008, GB T16270-2009, delivery status: quenched and tempered.
The chemical composition of Q690D steel includes elements such as carbon, silicon, manganese, sulfur, phosphorus, etc., among which the carbon content is higher, which can improve the strength and hardness of the steel. At the same time, some alloying elements are added to the steel, such as chromium, molybdenum, nickel, etc., to improve the corrosion resistance and wear resistance of the steel.
Q690D chemical composition (mass fraction, %)
c：≤0.18
si：≤0.60
mn：≤2.00
p：≤0.030
s：≤0.025
cr：≤1.00
ni：≤0.80
mo：≤0.30
b：≤0.004
v：≤0.12
Q690D mechanical properties:
Yield strength: 630MPa (different thickness, different yield value).
Tensile strength: 710-940MPa (different thickness, different tensile value).
Elongation: 14%.
Impact absorption energy: 47J(-20).
When working with Q690D steel, you need to pay attention to its welding properties and processability. The weldability of this steel is good, but it requires appropriate welding processes and materials to ensure the quality of welded joints. At the same time, the processing performance of the steel is also good, and it can be processed by cold working and hot processing.
Q690D steel plate has the following features:
High strength: Q690D steel plate has a yield strength of up to 690MPa and a tensile strength of up to 780MPa, which has excellent load-bearing capacity and deformation resistance.
Good welding performance: Q690D steel plate can be welded by a variety of welding methods, and the welded joint has high strength and is not easy to crack and deform.
Excellent low-temperature toughness: Q690D steel plate can still maintain good toughness at low temperatures, and is not prone to brittle fracture.
Good corrosion resistance: Q690D steel plate contains an appropriate amount of alloying elements, which has certain corrosion resistance and can resist the erosion of corrosive media to a certain extent.
Good machinability: Q690D steel plate can be processed by cold working and hot working, etc., and the processing performance is good.
In a word, Q690D steel plate has the characteristics of high strength, good welding performance, excellent low-temperature toughness, good corrosion resistance and good processing performance, and has a wide range of applications in the fields of construction machinery, mining machinery, construction machinery, shipbuilding, bridge construction and pressure vessels.
Application areas of Q690D steel plate:
Construction machinery: Q690D steel plate is often used in the manufacture of structural parts of excavators, loaders, bulldozers and other construction machinery, such as frames, booms, bucket teeth, etc.
Mining machinery: Q690D steel plate can be used to manufacture structural parts of mining machinery, such as crushers, conveyors, mining trucks, etc.
Construction machinery: Q690D steel plate can be used to manufacture structural parts of construction machinery, such as tower cranes, lifts, concrete pump trucks, etc.
Shipbuilding: Q690D steel plate can be used to manufacture the structural parts of ships, such as hulls, decks, cabins, etc.
Bridge construction: Q690D steel plates can be used to make structural parts of bridges, such as main beams, pier columns, bridge decks, etc.
Pressure vessel: Q690D steel plate can be used to manufacture structural parts of pressure vessel, such as storage tanks, gas cylinders, reactors, etc.