WISDRI CONTINUOUS CASTING-DIRECT ROLLING SYSTEM FOR WIRE ROD AND BAR

Transcription

1 WISDRI CONTINUOUS CASTING-DIRECT ROLLING SYSTEM FOR WIRE ROD AND BAR FAN JINLONG WISDRI Engineering & Research Incorporation Limited, Wuhan, China 2018/6/26

2 2 WISDRI CONTINUOUS CASTING-DIRECT ROLLING SYSTEM

3 Concept Advantages Key Technologies Applications Contents 4 3

4 1. Concept WISDRI CONTINUOUS CASTING-DIRECT ROLLING SYSTEM WCCDR:the high-temperature and defect-free billet produced by the continuous casting machine (CCM) is Temp/ directly fed into the rolling mill after cut-to-length without reheating. Time/s 1 CCR;2 HCR;3 DHCR;4 WCCDR Qualified Billet No Furnace Fast Delivery Low Temperature Rolling 4

5 2. Advantages & Disadvantages Make full use of CC metallurgical thermal energy, and eliminate reheating process, save energy and reduce the emission of reheating furnace Simplify the production process, which reduces the investment and operating costs in the furnace area Reduce the scales burning loss, and the yield can be increased The section temperature distribution makes the deformation deep into the center of the billet in the rough rolling stage Flexible and low investment, which can be applied for both newly-built and revamping projects. Direct connection between continuous casting and rolling, high requirements on the production management Temperature differences in the section and the length direction Cold billets are unavoidable, due to the difference in the production rhythm 5 Low-temperature rolling increases the rolling load

6 3. Key Technology Production Capacity Matching Production Capacity Matching Macro matching Annual output Hourly output CCR HCR WCCDR Micro matching Rhythm of production 6

7 3. Key Technology Production Capacity Matching Hourly output WCCDR If the metal mass flows ( ) of all the products are all equal and satisfy formula (1), the WCCDR production capacity can be completely matched (ie, k=0). ). Therefore, the hourly output of each specification product that uses slitting rolling to produce rebar can be basically equal, and has good compatibility 7 with continuous casting production capacity.

8 3. Key Technology Production Capacity Matching Rhythm of production The multi-stream billets are cut in a step-like manner in sequence, and each flow billet is rapidly sent to the entrance of the mill immediately after cut-to-length. WCCDR 2m L5 2m L4 L3 2m L2 2m L1 2m 10m 8

9 3. Key Technology Temperature Matching Reasonably increase the drawing speed CCM Optimize the cooling water distribution in secondary cooling zone Flexible Connection Area Optimize cut-to-length RM increase the speed of the roller table Thermal insulation cover 9

10 Surface temp WISDRI CONTINUOUS CASTING-DIRECT ROLLING SYSTEM 3. Key Technology Temperature Matching CCM Reasonably increase the drawing speed Flexible Connection Area RM Drawing speed 10

11 3. Key Technology Temperature Matching Optimize the cooling water distribution in secondary cooling zone CCM Flexible Connection Area RM The cooling water control system with feedback is used to collect the real-time temperature data of the billet, adjust the amount of the secondary cooling water flow, and reduce the cooling intensity to increase the billet temperature under the premise of ensuring the solidification quality of the billet. 11

12 3. Key Technology Temperature Matching Optimize cut-to-length CCM Flexible Connection Area Move the cutting point forward by 4-6m Hydraulic shear RM 12

13 3. Key Technology Temperature Matching ~30s cutting time,s 1.5~2min cooling time before cutting,s WCCDR Conventional CCM length of the cooling zone,m

14 3. Key Technology Temperature Matching Increase the speed of the roller table CCM Flexible Connection Area RM Running time,s Running speed,m/min Roller table length,m ~75s Increase the speed of the roller table after cutting and the conveying roller table. Each strand is controlled separately WCCDR Conventional CCM 14

15 3. Key Technology Temperature Matching Thermal insulation cover CCM radiation reflection Flexible Connection Area RM 15

16 3. Key Technology Temperature Matching CCM ~141m HCR Flexible Connection Area ~97m WCCDR RM 16 After cutting to length At the entry of the mill

17 3. Key Technology Temperature Matching Low temperature rolling technology is the guarantee of the temperature CCM Flexible Connection Area RM matching in WCCDR; The WCCDR has a lower initial rolling temperature, a nearby finish rolling temperature, and temperature distribution characteristic of two low and two high ; The deformation in the rough rolling stage can be deep into the center of the billet; the temperature difference between the head and tail of the billet can be controlled within 50 C in the WCCDR. 17 Tail Head

18 3. Key Technology Temperature Matching CCM Temp. distribution on the section of the billet 1000 Flexible Connection Area Avg Temp. on the section Temp. equivalent strain,mm.mm -1 WCCDR HCR RM Distance from the center, mm 18

19 4. Applications CCM:7 strands CCM Billet: mm Rolling mill:2 wire rod mill(+5.0m) Products:Φ6~14mm coil Steel grade:hrb400e HRB500E 19

20 4. Applications CCM: 8 strands CCM Billet : mm Rolling mill :2 bar mill Products :Φ12~40mm Steel grade :HRB400E HRB500E 20

21 Contact information Name: FAN JINLONG Company: WISDRI Engineering & Research Incorporation Limited Address: No.33, DaXueYuan Ave.,Wuhan,Hubei Province,P.R.China 21

22 ` Professional Devoted Constant Foresighted Thank you! 22