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.sdbrightsteelbar.com
At present, countries and regions around the world have begun to ban the use of incandescent lamps. Under the influence of the policy drive and the long-life effect of LED lights, LED lighting entered the year of explosion in 2013, and the ushered in after the outbreak is bound to be a gradual decline in the market, according to the market share report of the market research organization HIS. The sales volume of light sources has declined year by year since 2015.
Countries and regions around the world have begun to ban the use of incandescent lamps. Under the influence of policy and the long-life effect of LED lights, LED lighting entered the year of explosion in 2013, and the ushered in after the outbreak is bound to be a gradual decline in the market. According to the lighting market share report of the market research organization HISResearch, the sales volume of light sources has declined year by year since 2015.
According to a report released by IMSReserch in April 2012, the price of LED lights tends to be lower than $30 in 2009, and will break through the $5 mark around 2017. The popularity of LED lamps depends on the speed at which their prices fall, while the 40 cost of LED lamps is spent on driving control circuits, so the cost reduction of control circuits including LED driver ICs is critical. Correspondingly, the cost of the drive control circuit is expected to decrease between 2013 and 2015.
Although the LED driver power supply has made a breakthrough in technology, the cost has been maintained at around 200 yuan. If the sales price is less than 400 yuan, it is basically a loss state, while foreign manufacturers such as Philips have the lowest sales price of 180 yuan. With the increase in labor costs, rent, marketing and office costs, LED drive power supply price reduction is quite difficult, many companies have to fill the cost pressure from technology and design.