Technology Name: bar multi line segmentation and controlled rolling and controlled cooling energy saving technology

Two. Technology area and scope of application: rolling of small size thread steel in iron and steel industry

Three, energy consumption and carbon emissions related to the technology

At present, the energy consumption of rolling small size thread steel bar in domestic rolling enterprises is 53 kgce / T steel, mainly producing grade II screw steel, and the construction field of our country will require the use of grade III or above screw steel in the future, so improving the strength of screw steel and reducing the production energy consumption are the main development direction of small size thread steel bar. At present, the technology can achieve 30 thousand tce/a energy saving and CO2 emission reduction of about 80 thousand t/a.

Four, technical content

1. technical principles

Multi-line slitting technology is to use special roll pass and slitting guide device to slit one piece into several pieces along the longitudinal direction on the section steel hot rolling mill, and then roll out a number of finished products. The 4/5 splitting guide device adopts two sets of splitting wheels, the front splitting wheel separates the two steels on the outer side of the multi-strand billet first, and the latter splitting wheel separates the two or three-strand billets in the middle, thus realizing the 4/5 splitting rolling. Controlled rolling and controlled cooling technology is to control the deformation of the rolled steel and install a special water cooling device between the racks and the finished products during the hot rolling process, so that the rolled piece can pass through the water at normal temperature and cool the rolled piece rapidly, so as to improve the microstructure and properties of the steel.

2. key technologies

(1) multi line segmentation technique

The shovel nozzle and the shovel tip are designed at the front of the multi-wire slitting device to solve the problems of rolling roll wrapping and precise alignment; the stepless adjustment technology of worm wheel and worm is adopted; the rolling friction is used in the dividing box to ensure that the rolling parts are not easy to block up; the new materials for the key parts such as high wear resistance, non-sticking steel, impact resistance and high temperature resistance are developed. According to the equipment condition, the matching special 4/5 slitting pass system and corresponding automatic control system are designed.

(2) controlled rolling and controlled cooling technology

Special ribbed pipes are used to make the rolling piece run smoothly in the water piercing device and reduce the probability of steel plugging; the key parts are made of new materials with high wear resistance; water flow and pressure are automatically adjusted and controlled according to the rolling speed and temperature.

Hangzhou GSR-Threads Tools Co.,Ltd

Address：No.381,Tianjiali,Tianfeng Village,Yiqiao Town,Xiaoshan,Hangzhou,311258,China

Tel：     +86-571-826 883 63

Phone：+86 182 584 02850

Fax：    +86-571-838 647 37

E-mail：info@gsrthreads.com