Research on Control of Transverse Crack in the Corner of Sub-Peritectic Steel Continuous Casting
Steel grades with a carbon mass fraction of 0.09% to 0.16% are called sub-peritectic steels. In the continuous casting process, molten steel undergoes a series of phase transformation, crystallization and other processes, especially when the carbon content of the steel is in the peritectic reaction zone, due to the occurrence of the peritectic reaction, the liquid phase and the delta phase almost disappear and transform into Austenite causes larger volume shrinkage, increases the gap between the casting slab and the mold, and increases the thermal resistance accordingly. Due to the uneven heat transfer, the thickness of the solidified shell is also uneven. Under the action of thermal stress, friction, and hydrostatic pressure of steel, the crack sensitivity is greatly increased, and when the value of these stresses is greater than the maximum that the shell surface can withstand Under stress, cracks will begin to occur on the surface of the cast slab, and the transverse cracks at the corners are particularly prominent.
In order to improve the surface quality of the sub-peritectic steel continuous casting slab, scholars at the University of Science and Technology Beijing used low-power microscopic observation and simulation to study the formation mechanism of the transverse cracks at the corners of the sub-peritectic steel continuous casting slab.
Different steel grades have different structures near the transverse cracks at the corners. The structure near the cracks of steel grades with a carbon content of 0.15% is uniform ferrite + pearlite
The cracks of the steel with 0.093% carbon mass fraction mainly occur on the intergranular proeutectoid ferrite film with a thickness of about 50μm, and the crack occurrence rate of the latter is about 3 times that of the former;
The carbon content has a fundamental impact on the plasticity of steel grades, thus affecting the occurrence of corner transverse cracks. Industrial test results show that when the carbon mass fraction is less than 0.1%, the carbon mass fraction is reduced to 0.07%, and the corner transverse cracks occur. The rate can be reduced from 44% to about 4%.
The optimization results of the secondary cooling numerical simulation show that the optimized cooling scheme of the weak cooling mode before the bending section and the strong cooling mode of the inner arc after the bending section can ensure that the temperature of the inner and outer arc corners of the continuous casting slab avoids the third brittle zone and optimizes the crack after optimization. The number and length are greatly reduced, and the occurrence of corner transverse cracks can be well controlled.
Please keep the source and address of this article for reprinting:Research on Control of Transverse Crack in the Corner of Sub-Peritectic Steel Continuous Casting
Minghe Die Casting Company are dedicated to manufacture and provide quality and high performance Casting Parts(metal die casting parts range mainly include Thin-Wall Die Casting,Hot Chamber Die Casting,Cold Chamber Die Casting),Round Service(Die Casting Service,Cnc Machining,Mold Making,Surface Treatment).Any custom Aluminum die casting, magnesium or Zamak/zinc die casting and other castings requirements are welcome to contact us.
Under the control of ISO9001 and TS 16949,All processes are carried out through hundreds of advanced die casting machines, 5-axis machines, and other facilities, ranging from blasters to Ultra Sonic washing machines.Minghe not only has advanced equipment but also have professional team of experienced engineers,operators and inspectors to make the customer’s design come true.
Contract manufacturer of die castings. Capabilities include cold chamber aluminum die casting parts from 0.15 lbs. to 6 lbs., quick change set up, and machining. Value-added services include polishing, vibrating, deburring, shot blasting, painting, plating, coating, assembly, and tooling. Materials worked with include alloys such as 360, 380, 383, and 413.
Zinc die casting design assistance/concurrent engineering services. Custom manufacturer of precision zinc die castings. Miniature castings, high pressure die castings, multi-slide mold castings, conventional mold castings, unit die and independent die castings and cavity sealed castings can be manufactured. Castings can be manufactured in lengths and widths up to 24 in. in +/-0.0005 in. tolerance.
ISO 9001: 2015 certified manufacturer of die cast magnesium, Capabilities include high-pressure magnesium die casting up to 200 ton hot chamber & 3000 ton cold chamber, tooling design, polishing, molding, machining, powder & liquid painting, full QA with CMM capabilities, assembly, packaging & delivery.
ITAF16949 certified. Additional Casting Service Include investment casting,sand casting,Gravity Casting, Lost Foam Casting,Centrifugal Casting,Vacuum Casting,Permanent Mold Casting,.Capabilities include EDI, engineering assistance, solid modeling and secondary processing.
Casting Industries Parts Case Studies for: Cars, Bikes, Aircraft, Musical instruments, Watercraft, Optical devices, Sensors, Models, Electronic devices, Enclosures, Clocks, Machinery, Engines, Furniture, Jewelry, Jigs, Telecom, Lighting, Medical devices, Photographic devices, Robots, Sculptures, Sound equipment, Sporting equipment, Tooling, Toys and more.
What Can we help you do next?
∇ Go To Homepage For Die Casting China
→Casting Parts-Find out what we have done.
→Ralated Tips About Die Casting Services
By Minghe Die Casting Manufacturer |Categories: Helpful Articles |Material Tags: Aluminum Casting, Zinc Casting, Magnesium Casting, Titanium Casting, Stainless Steel Casting, Brass Casting,Bronze Casting,Casting Video,Company History,Aluminum Die Casting |Comments Off