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Rolls for Metal Rolling
The SHI Group succeeded in the manufacture of ductile rolls for the first time in Japan in 1953. Since then, the SHI Group has secured and retained the strong position of the top manufacturer of ductile rolls. Current product lines include cast iron varieties (ductile and glen cast iron), steel roll varieties (adamite and graphite steel), as well as high speed tool steel (HSS) rolls and powder high speed steel rolls, which are made available due to the improved performance of the rolling facilities, energy conservation, labor savings and improved productivity, in order to respond to a diverse range of our customers' requirements. The SHI Group will continue to develop products that are suitable for the needs of the users.
Special heat treated strong rolls: "Sip Roll"
A special heat treatment known as the "SIP" or the "Sumitomo Improvement Penetration" arranges the upper layer constituents of the roll surface in a precise manner, which not only improves the mass effect but also raises the overall strength and dramatically improves the bending durability. This is a roll with significant improvement of surface roughness resistance and thermal crack
An example of mechanical characteristics
|N treatment||SIP treatment|
|Bearing force (kg/mm2)||49||58|
|Impact value (kg/cm)||0.9||1.6|
|Fatigue strength (kg/mm2)||19||24|
|Fracture toughness value (KIc)||185||203|
Sumitomo High Speed Tool Steel (HSS) Rolls: "STZ"
These are rolls that have properties that are in between the high speed tool steel materials and the conventional materials such as cast iron materials (ductile cast iron) and cast steel materials (adamite). These are rolls with material characteristics that appear to contradict each other, such as thermal crack resistance, toughness, wear resistance and surface roughness resistance, making it capable of responding to a variety of quality requirements as a raw material and through the entire process leading up to the finishing stand.
Sumitomo Powder High Speed Tool Steel (HSS) Rolls: "SPH"
These products have better wear resistance and roughening resistance than soluble (casting) high speed tool steel rolls, and they are used as high-quality roll materials.
Positioning of Powder High Speed Tool Steel
To each stand, we apply the manufacturing know-how of Osprey High Speed Tool Steel rolls (spray casting method: rapidly cooling and solidifying process in the Osp method) that we have manufactured previously. It is used for bar steel, wire rods, medium rolls for flat steel and rolls for finishing.
Comparison of Characteristics of Material Quality of High Speed Tool Steel Rolls
|Type||High hardness soluble High Speed Tool Steel rolls||Osprey rolls||Powder High Speed Tool Steel|
|Stand to be applied||Improvement in wear resistance in the orientation of the finishing train||Improvement in wear resistance in the orientation of the finishing train||Improvement in wear resistance in the orientation of the finishing train|
|Required quality||Heat crack roughening||×||◯||◯|
|Ingredient design||Low alloy||High alloy||High alloy|
|Heat treatment design||Hardening of the base structure||Hardening and control of the base structure||Hardening and control of the base structure|
|Microstructure design||Increase and decrease of hard carbide and carbide lumps||Granular and finer structure, and increase and decrease of hard carbide||Granular and finer structure, and hard carbide|
|Material quality symbol||SEH-4W||SOX-30||SPH-20|
|Microstructure (x 500 times)|
Powder High Speed Tool Steel utilize the rapid cooling and solidifying process. They have excellent material characteristics because, compared with the soluble process, carbide is granular in the microstructure, is distributed uniformly and minutely, and there is no macroscopic segregation.
They also have superior mechanical characteristics, and their roll characteristics include wear resistance and roughening resistance.
|Type||Roll material||Material code||Hardness (HS)|
|Ductile rolls||Special heat treated ductile||SIP-3||40-55|
|Special heat treated ductile||SIP-4||55-60|
|Special heat treated ductile||SIP-5||60-65|
|Special heat treated ductile (wear resistance)||BSIP-3||50-60|
|Special heat treated ductile (wear resistance)||BSIP-4||55-65|
|High alloy ductile||73A||50-65|
|High alloy ductile||73B||60-70|
|High alloy ductile||7LB||70-80|
|Glen rolls||High alloy glen||64||60-70|
|High alloy glen||65||65-75|
|Composite high glen||H65W||75-85|
|Adamite rolls||Special heat treated adamite||SIP-2A||35-50|
|Special heat treated adamite||SIP-3A||40-55|
|Special heat treated adamite||SIP-4A||50-60|
|Special heat treated graphite steel||SIP-2G||35-45|
|Special heat treated graphite steel||SIP-3G||40-50|
|High Speed Tool Steel rolls||Composite High Speed Tool Steel (heat resistance crack type)||SKN-2W||60-70|
|Composite High Speed Tool Steel||STZ-2W||70-75|
|Composite High Speed Tool Steel||STZ-3W||75-80|
|Composite High Speed Tool Steel||SEH-3W||70-80|
|Composite High Speed Tool Steel||SEH-4W||75-85|
|Powder High Speed Tool Steel rolls||Powder High Speed Tool Steel||SPH-20||80-90|
|Powder High Speed Tool Steel||SPH-30||90-95|
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- Rolls for Metal Rolling