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
Cold Drawn Bar,Round Steel Bar,Cold Drawn Steel Bar,Aisi 1018 Steel Square Bar SHANDONG LE REN SPECIAL STEEL CO., LTD. , https://www.sdhighstrengthsteelbolts.com
Yongjia and Longwan are the main bases for the production of Wenzhou pump valves. According to the staff of the Yongjiameng Valve Industry Association, from January to June, Yongjia had export-oriented pump valves worth 1.4388 trillion U.S. dollars, a year-on-year increase of 61.4%. More products were exported through foreign trade companies. Far larger than the statistical value. From January to June, Longwan District exported about 35 million US dollars worth of valves, an increase of 24.8% year-on-year, mainly exported to the Middle East and the European Union.
Not long ago, the Yonghe County Haihe Pump Factory just completed an order from Thailand's Ministry of Water Resources and shipped it. This order is for 50 sets of self-priming diesel engine double-suction pumps with a total value of more than 3 million yuan. The person in charge of the sales department of Haihe Pump Factory stated that this order was only a small test order from Thailand and Thailand was very satisfied with the product quality. Next, the company will negotiate with them an order for 750 pump valves. Wenzhou's valve brand has gradually been recognized by the international market, and it has gradually embarked on its own brand management from OEM processing. Thailand's customers are looking for the Haihe Pump Factory's reputation in the international market. Through this direct sales model facing the end-user customers, companies benefit a lot.
The export valves of Wenzhou area mainly include gate valves, globe valves, check valves, etc. There are 548 valve companies with export records in the area, and 425 actual shipping companies in the first half of 2012. The number of exporting countries and regions is 128, and the top ten exports are: the United States, Russia, Italy, UAE, India, Spain, South Korea, Iran, Mexico, and Malaysia. In the first half of this year, the Wenzhou valve company's trade volume to these 10 countries has greatly increased, the export batch is 3239 batches, amounting to 140 million US dollars, accounting for 37.35% and 52.04% of the total export batch and total amount.
In recent years, the quality of Wenzhou's export valve has been steadily improved, and it has been recognized by foreign customers, especially long-term customers, which is the biggest guarantee for the growth of the export volume of valves. In addition, most of Wenzhou's export valves are industrial general-purpose valves, most of which are used for supporting large-scale industrial projects and assembly lines. Although the economic crisis in the United States and the European Union has not been eased, it has little impact on them. 
Wenzhou Valve Products International Market Development Comment Analysis
From January to June, 8672 batches of Wenzhou valve products were exported, with an export value of 269 million U.S. dollars and the export value increased by 42.33% year-on-year. Valve products have become one of the fastest growing products in the city in the first half of this year.