Steel-rolling System

2250mm Hot Rolling Skin-pass Mill (EPC) for Ma’anshan I & S Corporation

Customer：Ma’anshan Iron & Steel Co., Ltd.

Project schedule：18months，Jan,2006, Contract signing, put into production in Sep.2007.

Contract scope：EPC turn-key project.

Brief introduction ：

Ma steel’s hot roll skin-pass project is a turn key project which was contracted by Sinosteel MECC. Sinosteel MECC is in charge of the project design, equipment purchase, installation, commission and the deliver of the contracted plant. The design capacity is 800,000.00ton, The whole equipment and technology will be the first class in the China. The project is also the first EPC project in Ma steel, the technical ability and service level of the project construction are fully affirmed and highly admired by Ma Steel.

The main technology parameters:

1.Incoming coil specifiaction：

• Material：normal carbon steel, High quality carbon steel, low-alloy high strength steel,
• Coil inner diameter：762mm
• Coil outside diameter：1000－2150mm
• Strip width：800－2130mm
• Strip thickness：1.20－12.70mm
• Maximum yield stength：680MPa
• Maximum tensile stength：800MPa
• Maximum coil weight：45t Max strip entry temperature：80℃

2. Total output：800，000 ton/year

3. Max coiling speed： 400m/min

4. Shear capacity： 12.7×2130 mm（thick×width） δB=800N/

5. Coil specifications after skin passing Strip thickness： 1.20－6.35mm

6. Coil specifications after dividing

Strip thickness： 1.20－12.70mm

Single coil weight： 5－45t

The stand is equipped with the following features：

• Positive and negative work roll bending system；
• Work roll shifting device to shift the upper work chocks+rolls and the lower ones in counter-wisedirection, in order to increase the effectiveness of the roll bending system, notwithstanding change in strip width.
• Hydraulic roll gap control by hydraulic actuators placed in top position of housings, for easy maintenance operation.
• Upper back-up chocks balancing system.
• Precision elongation measuring, precision pressure measuring and controlling system.
• Quick work roll changing device with side shifting system.
• The rolling line is provided with the latest state of Art Automation System to achieve the targets regarding productivity and quality.