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.
According to different steel grade, the production line is usually different. The Basic production line is as below:
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
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However, compared with the international advanced level, there is still a gap in the overall level of China's construction machinery, and some products are in the second and third-tier products in the international mainstream market; China's construction machinery companies are competitive with multinational enterprise groups of large-scale construction machinery. Still relatively weak. In the journey to a manufacturing powerhouse for construction machinery, the development situation will be more severe and the challenges will be even greater. We must not stop at Yangshan and rest on our laurels. We must maintain a high spirit and work hard to climb and march forward and work harder to create the future. "We worry about rejuvenating the country and rejuvenating our country." We must be prepared for danger in times of peace, increase the sense of anxieties, adapt to the situation, grasp the overall situation, explore continuously, and open up new trails.
At present, the situation facing is the globalization of economy and market, the intense competition, the individuation and facilitation of demand, the diversification of relevant stakeholders, and the speedy development of science and technology. This requires us to scientifically and accurately predict the future. Coping, the only way. 
Development Trend and Countermeasures of China's Machine Tool Accessories Industry
Yanshan Ao Kai discusses the development trend and countermeasures of China's machine tool accessory industry. The development of machine tool industry is an important equipment for national economic construction, and occupies a decisive position in the equipment industry. The sales revenue of China's machine tool industry in 2007 was 22,3 billion yuan, ranking second in the world's machine tool industry. From 2001 to 2007, the average annual growth rate exceeded 24%. Exports increased from 224 million U.S. dollars in 1998 to 8.7 billion U.S. dollars in 2007, an increase of 37 times in 10 years. At present, China's construction machinery industry occupies an important position in the global counterparts, and its products have been exported to engineering and machinery powerhouses such as Europe and the United States, and it is moving toward “manufacturing power†and “manufacturing powerâ€.