The Measures To Improve The Quality Of SWRCH22A Wire Rod

Publish Time: 06/19 2021 Author: Site Editor Visit: 12241

SWRCH22A is a kind of hot-rolled non-twist and controlled cooling wire rod. Mainly used to manufacture standard fasteners such as bolts, screws, studs, nuts, rivets and self-tapping screws. The quality problems that are prone to occur during the manufacturing process are: breakage during the drawing process, cold heading cracking, substandard torque of self-tapping nails, and nail tip cracking.
Analysis shows that inclusions and Widmanstatten structure are the main factors that affect the wire rod drawing performance. The surface quality defects of the wire rod cause cold heading cracking, and the loose center and shrinkage cavity of the continuous casting billet will lead to insufficient torque and nail tip cracking. .

To this end, the following control measures are taken:

1. Increase the ratio of acid-soluble aluminum by controlling the Al content in the molten steel treatment stage.

Specific:

(1) The C content of the converter tapping is controlled above 0.10%, the alloy adding sequence is standardized, the tapping process is strictly prohibited from slagging, the tapping is equipped with aluminum, and the incoming Al is controlled at about 0.020%.
(2) In the early stage of LF furnace, calcium carbide and aluminum pellets are used to quickly form white slag. After the white slag, aluminum wire is used to adjust the Al content to ensure the wire feeding speed. When feeding the wire, the bottom blowing is appropriately increased, and the Al is adjusted to 0.050%. ~0.060%, and subsequent aluminum supplementation is strictly prohibited. The Si content is controlled within 0.06%.
(3) In the later stage of refining, feed the iron-calcium line 400m to ensure the line speed. After feeding the thread, perform soft blowing, and the soft blowing time is controlled 12 to 15 minutes. The proportion of acid-soluble aluminum stabilized at more than 80% after process adjustment.

2. Through the use of terminal electric agitation, the looseness of the heart and the segregation of ingredients can be improved.

The casting process of the casting machine is fully protected and prevents secondary oxidation. The electric stirring parameters are adjusted to: the first end electric stirrer 3Hz, 200A (the original process 3.5Hz, 350A); the end electric stirrer 8Hz, 350A (two-way alternating, the original process does not Turn on the end electric stirrer).

3. The central shrinkage defect is due to the volume shrinkage caused by the solidification of the cast slab and the volume shrinkage caused by the cooling has not been completely supplemented, and the hole is produced in the final solidification place. In the smelting and continuous casting process, low superheat, low drawing speed, suitable secondary cooling strength, combined with electromagnetic stirring, strong end cooling and other technologies, through the relative stability of the entire continuous casting process and the coordination of each link , It is helpful to eliminate or reduce the center shrinkage defect of continuous casting slab.

4. Control the surface quality of the wire rod by strengthening the inspection of steel rolling process parts, increasing the frequency of on-line pickling of the wire rod surface, and stopping the inspection and processing when problems are found.

5. Strengthen the implementation of the heating system, strictly control the steel temperature, and further optimize the air-cooled line controlled cooling process. For example, the spinning temperature should not be too high, and the air-cooled roller table speed should not be too fast to extend the decomposition of austenite at a moderate temperature The lower transition time ensures uniform structure and avoids mixed crystal and Widmanstatten structure.

Please keep the source and address of this article for reprinting: The Measures To Improve The Quality Of SWRCH22A Wire Rod

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.

ISO90012015 AND ITAF 16949 CASTING COMPANY SHOP

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.

POWERFUL ALUMINUM DIE CASTING WITH ISO90012015

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 and mold manufacturing

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.

Minghe Casting Additional Casting Service-investment casting etc

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.