Cold drawn steel bar is produced by Hot Rolled Steel Bar or wire rod to get smooth surface, more precision size, higher mechanical properties, which improves machining characteristics. It can also get various sections and sizes. So cold drawn steel bar is a better choice for machining users.
For high carbon steel or alloy steel bars, to avoid the cracks in inner or surface, the bars are usually required to be annealed before cold drawing.
To get different mechanical properties or hardness depending on final usage, the cold drawn bars will also be heat treated such as annealed, normalized or quenched and tempered(Q&T).
For CNC machines usage, to get much more precision sizes or much more better surface roughness for chrome plating, the cold drawn steel bars can also be centerless ground or polished.
We have more advantages on producing cold drawn steel bars:
1) Big stocks of hot rolled round bars or wire rods as raw materials
2) Wide range of cold drawn steel bar sizes: from 10mm to 150mm
3) Different cold drawing medias powder or oil to get different surface
4) Straightening machines to get better straightness up to 0.5mm/m
5) Grinding and polishing machines to get better roughness upto 0.4um
6) Heat treating furnaces to adjust the mechanical properties
7) Full sets of testing equipment to test the sizes, mechanical properties and microstructure.
8) Multiple packages to avoid broken packages and anti-rusty
Cold Drawn Steel Bar,Cold Drawn Steel Rod,Cold Drawn Steel,Cold Drawn Steel Bar Manufacturers,Cold Drawn Steel Properties SHANDONG LE REN SPECIAL STEEL CO., LTD. , https://www.js-luggagecarts.com
Most enterprises, especially state-owned and old enterprises, still have traditional equipment as their main production force. Advanced heat treatment processes and equipment that are critical to bearing life and reliability, such as controlled atmosphere protection heating, double refinement, and bainite quenching, have low coverage, and many technical challenges have failed to achieve breakthroughs.
The research and development of new steel grades for bearing steels, the improvement of steel quality, and the development of related technologies such as lubrication, cooling, cleaning, and abrasives, have not yet been able to meet the requirements of bearing product levels and quality improvement. As a result, the process capability index is low, the consistency is poor, the product processing size dispersion is large, and the inherent quality of the product is unstable, which affects the accuracy, performance, life, and reliability of the bearing.
The overall development speed is not fast enough, and the development of high-end abrasives has been greatly deficient. This has made the selection of foreign high-quality products the only way for some high-quality bearing manufacturers. In desperation, abrasives have lost a large part of their applications. The lack of communication between bearing companies and abrasive manufacturers has made this gap widening.
Increase the production of high-grade bearings to meet the needs of the domestic market With the development of the market, users are increasingly demanding the precision, performance, life, and variety of bearing products. They are not satisfied with the requirements of general-purpose bearings, and the accuracy of steering is high. The demand for products with low noise and long life. Although the development of the bearing industry has increased, but compared with the world's leading industrial bearing industry, the industry still has a large gap, the main performance of high-precision, high-tech and high value-added bearing products, the proportion is low. Reflected in the market, our demand for high-quality bearings depends on imports.
Many bearing companies have achieved a certain degree of improvement in the technical level, reliability, and stability of the bearing industry through a series of independent innovation reforms, and in the future sales process, the important supporting market will still be controlled by these enterprises. .
The industry believes that the development of new steel grades for bearing steel, the improvement of steel quality, and the development of related technologies such as lubrication, cooling, cleaning, and abrasive tools cannot yet meet the requirements for bearing product quality and quality improvement. As a result, the process capability index is low, the consistency is poor, the product processing size dispersion is large, and the inherent quality of the product is unstable, which affects the accuracy, performance, life, and reliability of the bearing.
The overall development speed is not fast enough, and the development of high-end abrasives has been greatly deficient. This has made the selection of foreign high-quality products the only way for some high-quality bearing manufacturers. In desperation, abrasives have lost a large part of their applications. The lack of communication between bearing companies and abrasive manufacturers has made this gap widening. Therefore, to promote the further development of China's bearing industry, it is bound to further improve the level of technology and equipment of the bearing industry.
In recent years, the domestic bearing industry has rapidly expanded its production scale, with nearly 2,000 bearing companies, of which more than 900 have sales revenues of more than 5 million yuan, and the number is the largest in the world. In 2014, China's hardware bearing industry saw a slow progress in its manufacturing process and equipment technology, its low CNC processing rate, and its low level of automation in grinding operations. There are only 200 automated production lines in the country.
May 25, 2024