Process contract
Process contract at
Steel works
achieve efficiency in steel production lines with solid trust and
Mishima's comprehensive technical capabilities!
At Steel works, not only are there huge facilities such as blast furnaces and continuous casting, but all of the machines and parts for each process function accurately to deliver high-value-added steel products to society.
Based on the steel refining and processing technology we have cultivated over the years, we provide contract work on steel production lines as a business partner of the Nippon Steel Corporation Group, the world's No. 1 steel manufacturer.
Team Mishima brings together its comprehensive strengths, works to improve equipment and operational technology, and supports customers in the realization of safe, highly productive, and high-quality steel products.
Contract case examples
Case example 01Manufacturing process of thick stainless steel thick plates
Case example 02Thick plate manufacturing process
Case example 03Thin plate manufacturing process
Case example 04Manufacturing process
and the number of our employees
We have two locations for process contract, Kimitsu and Yahata factory, where about 750 employees are working.
Manufacturing sites of Nippon Steel Group and our contract
Early reduction of the risk level in the thick plate slab yard movable area
In order to reduce the risk level in the movable area of the thick plate slab yard at an early stage, we cooperated with the maintenance group without compromising safety measures, and achieved the goal with various countermeasures!
Participate and support the project. Received Nippon Steel Corporation Technical Development Headquarters Business Award!
We have established procedures for pretreatment of specimens and oxidation test work, chemical structure analysis, and data analysis using newly introduced equipment, and have contributed to the acceleration of analysis by proactively implementing operations and achieving sufficient results. We have received high praise from our customers.
Received a letter of appreciation from the General Manager of the Manufacturing Division of Nippon Steel Stainless Co., Ltd.
"Achievement of a new record for total heat treatment throughput"
The Yahata Department received a letter of appreciation from the customer for its contribution to setting a new record for throughput by providing operational support such as streamlining logistics.
Achieved a record of zero-schedule delay in a row in bridge auction orders witnesses! Received Nippon Steel Corporation's thick plate General Manager's Commendation
We have contributed to the improvement of the alignment rate by managing express materials in the process, including direct cooperation on a daily basis, and achieved no schedule delay for five consecutive years.
Case example 01
Manufacturing process
of thick stainless steel plate
of thick stainless steel plate
Subject: Yahata Department
For more than half a century, we have been in charge of finishing and ancillary work as a partner company at Nippon Steel Stainless Steel Co., Ltd.'s
thick plate plant located in the Yahata area of Kyushu Steel works, one of the world's leading stainless steel plate manufacturing locations.
Slab conditioning work before rolling
- Grinding of slab surface
- Gas cutting to the heating furnace input size
- Assembling clad steel slabs
Hydraulic straightening
After rolling, the flatness of the steel plate is adjusted by a hydraulic straightening machine.
Hydraulic straightening
Plasma cutting
The steel plate is cut to the dimensions specified by the customer using a plasma cutting machine.
Plasma cutting
Grinding
Polish the surface of the steel plate to the specified surface roughness with a wet polishing machine.
Grinding
Packing and shipping
Steel sheets that pass the Inspection are packed according to the customer's specifications and shipped.
Packing
Shipping
Case example 02
Thick plate manufacturing process
Subject: Steel Plate Department
Responsible for work directly related to the plate manufacturing line and ancillary work
at the plate plant in the Kimitsu area of Nippon Steel Corporation.
Photo: Nippon Steel
Furnace supply
Slab reception/Cutting/Furnace supply
Slabs (steel billets) manufactured in the steelmaking process are received in the yard by crane and gas-cut to size to be supplied to the heating furnace.
The cut slabs are supplied to the heating furnace by crane according to the production plan.
Yard operation room
Steel plate gas cutting
Gas cuts the rolled steel sheet into user-specified shipping sizes.
Numerically controlled equipment is used for gas cutting (drawing guide lines for cutting) and gas cutting.
(Cutting method: gas cutting, plasma cutting)
Marking-off operation room
Steel sheets that pass the Inspection proceed to the specified process,
or to warehousing and shipping.
Steel sheets that do not meet the shipping standards are added to the steel sheet refining process, and are corrected and repaired to meet the standards.
(correction, maintenance, etc.)
Steel plate finishing process
- Steel plates that deviate from the standard due to flatness (shape) reasons are corrected to become flat steel plates.
- For steel sheets that do not meet the standards due to surface defects, harmful defects are manually removed.
- The steel plates added to the steel plate refining process are re- Inspection after finishing the refining process, and the steel plates that pass the process proceed to the next process.
Corrective work scenery
Painting
If specified by the user, coating is applied to the front and back surfaces of the steel plate for primary corrosion prevention.
Painting scenery
Case example 03
Thin plate manufacturing process
Subject: Steel Plate Department
Responsible for work directly related to the steel sheet manufacturing line and ancillary work at the hot-rolling mill and cold-rolling mill in the Kimitsu area of Nippon Steel Corporation.
Photo: Nippon Steel
Receiving slabs and supplying heating furnaces
Slabs (steel billets) produced in the steelmaking process are received in the yard by crane. The received slabs are supplied to the heating furnace by crane according to the manufacturing plan. The crane moves remotely and automatically.
Slab transport by crane
Maintenance of rolling rolls
We disassemble the rolling rolls used for rolling and polish the used rolling rolls. Polished rolling rolls are reassembled and reused for rolling. We also maintain parts other than rolls after disassembly. (Grinding about 100 rolls/day)
Rolling roll polishing
Bearing maintenance
Case example 04
Manufacturing process of small diameter pipe
Subject: Steel Pipe/Steel Products Department
Responsible for work directly related to the pipe-making line and the finishing line at the small-diameter pipe plant in the Kimitsu area of Nippon Steel Corporation.
It adds value to the pipes manufactured on the pipe-making line and plays an important role in maintaining quality.
Heat treatment
Since the structure and strength of the pipe base material and the joint (welded part) are different, heat is applied to make the structure and strength uniform. Strict temperature control is required.
- Loading and unloading pipes using an overhead crane
- Temperature control of bright furnace
Correction
A straightening machine is used to straighten any bends in the pipe that were created during the manufacturing process.
- Reorganization and adjustment of straightening machine
- Bending measurement after straightening
(ET/UT)
Nondestructive Inspection(ET/UT)
UT (ultrasonic waves) and ET (eddy currents) are applied to the pipe and the projected waveforms are used to inspect for flaws and weld defects.
Expertise in reading the waveforms is required.
- Replacement and adjustment of flaw detector
- Checking inspection results
Inspection work
Cutting
Cut the pipe to the length required by the user. A chamfering machine is used to polish the burrs (cut ends) at the pipe ends created during cutting.
- Cutting machine setting, grindstone replacement
- Rearrangement of chamfering machine
- Operation monitoring during adjustment and continuous operation
Cutting work
Cutting work
Inspection
We measure and Inspection the pipe diameter, wall thickness, and length at
a specified frequency, and conduct a strict visual inspection of the pipe appearance and inner surface one by one.
- Measure pipe diameter, wall thickness and length
- Visual Inspection of pipe appearance and inner surface
Printing/Painting
A special paint is used to print on the body. Due to temperature and humidity changes, it is necessary to fine-tune the paint composition.
In addition, a rust inhibitor will be applied to the entire pipe to prevent the pipe from rusting.
- Printer settings and adjustments
- Sprayer settings and adjustments
- Operation monitoring during continuous operation
Packing and bundling
After forming the specified number of tubes, the ends and bodies of the tubes are wrapped in special packing materials to prevent scratches, dents, stains, rust, etc. during storage and transportation.
- Molding machine settings and adjustments
- Packing and bundling of pipes
Shipping
To transport by land (truck) or sea (ship), products are loaded onto truck carts or carts (pallets) to be transported to ships.
- Pre-shipment Inspection of products
- Loading onto a carts by an overhead crane
Supports stable operation
Maintenance
In order to ensure stable plant operation, we support the production lines at our customers' plants by making full use of our long-accumulated technology and
know-how, and we also leverage our comprehensive technological strengths to contribute to the improvement of our customers' manufacturing capabilities.
We support the stable operation of the plant as a partner company by updating and repairing facilities, inspecting equipment and facilities, etc.
Main facility list
Here is a list of the main facilities we own.