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FORGE-Roll Sleeve
ETERNAL
Cr2 forged‑steel roll sleeves are cylindrical sleeve‑shaped components made of Cr2‑series high‑carbon low‑alloy tool steel substrate through forging process. They are mainly applied in equipments such as cold rolling mills and powder metallurgy briquetting presses, serving as a core working part to perform material deformation and pressure transmission functions.
Typical grades:
8Cr2MoV，9Cr2，9Cr2Mo，9Cr2MoV，etc
Characteristics | Detailed Performances | Values |
Chemical composition | The Cr2 steel material can add elements such as Mo and V with high carbon (0.85-1.05%)+2% Cr | The elements of Cr2 steel can ensure high hardness and wear resistance, improve hardenability |
Hardness | The hardness of roll sleeve shall be 90-98HSD | The hardness of Cr2 steel can meet the requirements of cold rolling for wear resistance and surface accuracy |
Organizational stability | The Cr2 steel has low residual austenite content and minimal heat treatment deformation | Stable organization of Cr2 steel ensures long-term use of roller sleeves with stable dimensional accuracy |
Hardened layer | The depth of the hardened layer of the work roll sleeve is ≤ 15mm, and the depth of the intermediate roll sleeve is ≤ 25mm | Surface hardening of Cr2 steel can balance surface hardness and core toughness |
Mechanical properties | The Cr2 steel has good core toughness, high bending and torsional strength | The excellent mechanical properties of Cr2 steel can adapt to high stress conditions during rolling process |
Condition | Item | Typical |
Annealing | Hardness | ≤229 HB |
Suface hardening and low temperature Tempering | 90-98 HSD | |
Tensile Strength | ≥1000 MPa | |
Yield Strength | ≥800 MPa | |
Elongation | 8-15% | |
Impact | ≥40 J | |
Hardening layer | 10-25mm |
We always focus on customers, pay attention to their needs, provide high-quality products and excellent services to meet their expectations.
ETERNAL chooses premium ESR raw material to reduce hydrogen content and non‑metallic inclusions and enhance steel cleanliness.
ETERNAL applies open‑die forging to refine grains, eliminate segregation, ensure microstructure homogeneity and improve mechanical properties
Post‑forging treatment starts with slow cooling to prevent cracking, followed by spheroidizing annealing to reduce hardness for easier machining.
Quenching and tempering treatment is performed to achieve the final mechanical properties.
| Metallurgical Cold Rolling Fields | Cold rolling mill working roll, intermediate roll, and support roll | Cold rolling of plates and strips of carbon steel, stainless steel, and non-ferrous metals | Single‑stand or multi‑stand continuous rolling production line | |
| Other Industrial Fields | Working Rolls for Powder Metallurgy Briquetting Press and Mineral Powder Ball Press | Roll systems for finishing equipment such as temper mills and tension‑levelers | ||
Installation and Maintenance: The roll sleeves shall be precisely fitted with the roll shaft with controlled interference to avoid deformation caused by hot mounting.
Lubrication and Cooling: Adequate lubrication and cooling shall be provided for roll sleeves during cold rolling to prevent surface overheating and fatigue damage.
Wear Management: Regular inspection shall be performed on surface hardness and wear loss of roll sleeves, with timely grinding‑repair or replacement as required.
Failure Modes: The main failure modes of roll sleeves are wear, fatigue spalling and cracking. Rolling pressure and speed shall be properly controlled.
Our goal is to work closely with partners to help customers achieve greater success in multiple fields.
We collaborate with reliable logistics partners to provide efficient logistics and delivery services.
We provide comprehensive after-sales service, providing resolutions of any issues and free maintenance and replacement of parts during the warranty period.
We have a professional technical team that can provide technical consultation and support to customers.
From raw materials to the production process and before leaving the factory, all performance indicators are strictly tested, and the professional QC team controls according to the process.
