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Chung Hong Hot Roll Mill              CHS HR Product Specification

   Chung Hung’s Hot Rolling Mill was completed in less than two years since
May. 22nd, 1995. First hot rolling band was produced from HSM on Apr.28th, 1997.
We set a new record for the shortest construction time of similar plants in the steel industry.

   Hot Rolled Mill and Skin Pass Line produce all kinds of hot rolled bands and hot rolled temper grade coils with excellent quality and with the thickness of 1.2~12.7mm and 1.2~6.0mm, respectively. Width of 900~1560 mm.

   Chung Hung Steel has been accredited several international certificates including ISO9001, ISO 14001 and OHSAS 18001 in 2002 and hot rolled coils produced widely applied for producing hardware, containers, automobile bodies, home appliances, structural pipes, as well as construction pipes in addition to producing cold rolled coils and galvanized materials.


Location Of Hot Rolled Mill

   

 
Hot Rolled Product Brief

   Hot rolled coils, also known as black skin coils, can be suitable for re-rolling, slitting, and piping.They have a wide range of applications. The annual design production capacity of Chung Hung’s hot rolled mill is 2.4 million metric tons, which may produce hot rolled bands and hot rolled tempered coils conforming to all kinds of specifications with the thickness of 1.2~12.7mm and width of 900~1560 mm.Hot rolled products are made from slabs which are reheated in the hot strip mill at proper temperature, rolled in the roughing mill, through the coil box, rolled in the finishing mill, cooled in the laminar flow cooling system, and eventually down coiled into hot rolled bands in the down coil. The hot bands will be conveyed to the skin pass mill for pertinently tempering, crop shearing, weighing, packaging and marking to be further processed into tempered coils. All hot rolled products of Chung Hung have been accredited with ISO 9001 for quality management system certificate, ISO 14001 for management system certificate, and OHSAS 18001 for occupational health and safety management system certificate.

   Hot rolled coils have the characteristics that include adequate strength, well toughness, good weld ability, and easy formability, which can be used not only as the main materials in producing cold rolled coils, but also widely applied for hardware, automobile body plates, home appliances, structural pipes, construction pipes, and construction steels for structure. Specifications and main applications of hot rolled products are listed in the following table: 


Production Flow

Reheating Furnace

1.  Walking beam type.
2.  10 zones of computerized temperature control Offset skid design for reducing the skid mark & getting more uniform temperature.
3.  Offset skid design for reducing the skid mark in slabs  to increase the quality of slabs.
 
Roughing Mill
1.High pressure scale breaker at entrance and exit to
   increase thesurface quality of products. 
2.Continuous reversing 4 high rolling mill with screw down
   and balance oil cylinder mechanism for rolling stability.
3.Equipped with edger and AWC width auto control
   system for more precise rolling width than the tradition
   fashion .
4.Semi-auto work roller change equipment for reducing
    roller changing time so as to increase the production
    capacity.
5.Auto lubrication system for the transmit equipment to
   reduce maintenance time so as to increase the utilization
   of the equipment.
 
Coil Box

1.Saving total space of the hot rolling production lines and
   the costs of establishing equipments.
2.Keeping the coil temperature uniform and reducing cold
   mark through coiling.
3.Roughing mill and finishing mill can work at the same
   time to reduce pacing time.
4.Optimum Cutting Control System to reduce cutting loss
   of crop so as to increase the output rate.
 
Finishing Mill
1. 4 high reversing mill, 6 stands.
2. With work rolls side shift mechanisms and bending
    mechanisms for more feasibility in production
    scheduling and stability of crown of coils.
3. Use AGC Auto thickness and shape control system to
    control the thickness of steel strips more precisely and
    secure the thickness required by customers.
4. Available thickness of 1.2~12.7mm (the manufacturing
    process of 18mm having been independently 
    developed).
5. Automatically rapid work rolls change equipment
    adopted so as to reduce the time of changing rollers.
 
Laminar Flow Cooling System

1. to reach proper temperature prior to coiling.
2. auto temperature control equipped in the 11th bank,
    trimming control on No.4 and No. 11 banks,so as to
    promptly fix the temperature deviation.
3. the cooling system is divided into 4 regions to control
    and the side spray system is equipped in each region.
4. Cooling Down Capability：300℃
 
Down Coil

1. Equipped with auto jumping control system, utilizes the
     jumping control of three wrapper rolls for achieving the
    down coiling function.  
2. Equipped with auto banding system and auto numbering
    marking control system. 
3. Computer auto track of coils from coiling to conveying.


Skin Pass Mill

1. 4 high mill with Push-UP control system.
2. Center position control function to secure flat gesture of
    coils.
3. With leveler mechanism and slitting function.

General Product Specification

 
Size Code Use
API 5L
Line Pipe / Casing Pipe
  A36
Carbon structural steel
ASTM A1011
Forming/Structure Quality/High Strength Low Alloy
JIS G3101
Rolled steels for general structure
  G3125
Superior atmospheric corrosion resisting steels for welded structure
  G3131
Hot rolled mild steel plates, sheets, and strip
  G3132
Hot rolled carbon steel strip for pipes and tubes
  G3193
Dimensions, mass and permissible variations of hot rolled steel plates, sheets and strip
  G4051
Carbon steels for machine structural use
  G4304
Hot rolled stainless steel plates, sheets, and strip
SAE J403
Carbon steels
CH HF
Checked sheets and strip