• Hot Rolling
  • ・Hot Rolling Flow
    • └Slab Sizing Press
    • └Advanced Coil Box
    • └Differential Speed Crop Shear
    • └Finishing Mill
    • └Advanced Down Coiler
  • ・Endless Rolling Mill
  • ・Plate Mill
  • ・Steckel Mill
• Cold Rolling
  • ・Cold Rolling Flow
    • └Cold Rolling Mill
    • └Carrousel Tension Reel
    • └Advanced Strip Wiper
  • ・Tandem Cold Mill
  • ・Reversing Cold Mill
  • ・Non-Ferrous Mill
  • ・Special Steel Mill
  • ・Skinpass Mill
    ・Temper/DCR Mill
• Processing Lines
  • ・Processing Line Flow
  • ・Continuous Pickling Lines
  • ・Continuous Stainless Steel Annealing & Pickling Line
  • ・Continuous Annealing Line
    • └Entry Section
    • └Furnace Section
    • └Exit Section
  • ・Continuous Galvanizing Line
    • └Entry Section
    • └Furnace Section
    • └Galvanizing Process Section
    • └Exit Section
• Original Control Technologies
  • ・APFC
  • ・Slab Sizing Press Control
• Control Equipment
  • ・MHPC-M
    • └Description
    • └Delivery record and Specification
    • └The example of system configuration
    • └The example of controller configuration
    • └Display of Operation unit
    • └Adjustment support equipment
  • ・HYROP-MH-PC4
    • └Description
    • └Features of HYROP Control Panel
    • └History of HYROP Control Panel
    • └The example of system configuration
    • └Display of operation unit
    • └Option
  • ・HYROP-R700
    • └Description
    • └Features of HYROP Control Panel
    • └History of HYROP Control Panel
    • └The example of system configuration
    • └Display of operation unit
    • └Data Trace
  • ・Sales end information
  • ・After service information
  • ・Control Equipment catalog download
• Other Equipment
  • ・Casting Plants
  • ・Non-Flat Product Equipment
  • ・Mini-Cold Complex
  • ・Construction Service

Furnace Section

The continuous annealing furnace is located at the center of CAL or CGL, and is an important equipment that affects the final mechanical properties of the product.
As the steel strip passes between many rolls located inside the furnace, thermal patterns such as, heating, holding, and cooling are applied to the strip, for continuous steel strip annealing.

For many years, Mitsubishi-Hitachi Metals Machinery, Inc. has provided a large number of furnaces which meet the demands of customers. During this time,continuous effort has been exercised not only to meet needs such as higher productivity and better heating/cooling performance, but also to meet environmental needs such as reducing CO₂ and NOx emissions.
In a continuous annealing furnace, the key technology is the equipment which evenly heats and cools the steel strip in the lengthwise and width directions. Technology for moving the steel strip stably at high speed in high temperature environment is also needed.

Based on the experience, Mitsubishi-Hitachi Metals Machinery, Inc. will continue to provide these technologies as well as challenge to resolve new technical issues.

Lineup of Mitsubishi-Hitachi Metals Machinery furnaces:
• Vertical furnace
• Horizontal furnace
• L-type furnace (L-shaped which combines a vertical-type and horizontal type furnace)
• Rotary furnace

Continuous Annealing Furnace

Most of all annealing furnaces use indirect heating methods in order to prevent the strip surface from being oxidized during heating. This heating method uses radiant tubes made from heat-resistant steel. Mitsubishi-Hitachi Metals Machinery, Inc. has a wealth of experience in the selection of heat-resistant steel and radiant tube design . Mitsubishi-Hitachi Metals Machinery, Inc. also has experience related to combustion, including the use of a wide range of burners such as high-efficiency burners and low-NOx burners.

Heating Systems

Heating System (Radiant Tubes)

Mitsubishi-Hitachi Metals Machinery, Inc. possesses extensive expertise related to burners, and has independently developed a type of burner which heats the steel directly with a flame (MID burner (MH Impinging Deoxidizing Burner)). This burner directs the high-temperature flame and combustion gas at high speed onto the surface of the strip, allowing the steel strip to be heated quickly. This burner is noted for its ability to heat the strip in this manner without causing oxidation of the steel surface.

MID Burner

M-H's beak-shaped slit-nozzle gas jet cooling system is capable of rapidly cooling the steel strip evenly in the strip width direction.
In recent years, as a measure for reducing CO₂ emissions, there has been increasing demand for high-tensile steel sheet, a product which makes it possible to reduce vehicle weights. For this purpose, customers request faster cooling of the steel strip in the annealing furnace cooling zone.

Mitsubishi-Hitachi Metals Machinery, Inc. will select and propose the optimal cooling system which can meet a diverse range of needs on the process.

• Roll cooling systems
• Roll and gas jet combined cooling systems
• High-speed gas jet cooling systems (slit nozzle type)
• Gas jet cooling systems (round-hole nozzle type)
• Fog cooling systems (simultaneous gas/liquid spray type)
• Water immersion cooling systems

High-Speed Gas Jet Cooling System

Cooling System (Slit Nozzle Type)

Roll and Gas Jet Combined Cooling System

Roll Cooling System

One key technology is the ability to transfer the steel strip through the high-temperature furnace in a stable manner.
Because the strip in the furnace is hot and softened, wrinkles and breakage are more likely to occur than they are outside the furnace. Once a strip break occurs inside the furnace, it is necessary to stop the line for a long period of time, lowering productivity.
M-H's expertise related to matters such as layout of the in-furnace steering units strip tensions and design of initial roll shapes will provide stable strip transfer in a wide range of operation conditions.

In-Furnace Steering & Strip Transfer System

Contact between a roll and strip may cause scratches on the steel strip surface. For high-grade products which do not permit such scratches, a non-contact fashion of strip transport is needed, and M-H's floater system will realize it.
A horizontal floater which supports the steel strip in the horizontal plane, as well as a bend floater which can be installed at location of a deflector roll to change the strip travelling direction, are available.

Floater System

Floater System

Modular designs which simplify on-site furnace installation and shorten the construction period are introduced in some type of furnaces.
It is possible to assemble radiant tubes and rolls that will be placed inside the furnace before they are shipped from the shop.

Modular Horizontal Furnace Design

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