Forged steel cold mill work rolls
Cold mill work rolls are made of high-carbon alloy tool steel. The common materials are classified by Cr content into: 2%Cr series, such as 9Cr2Mo, 86Cr2MoV7 etc.; 3%Cr series, such as 9Cr3Mo, 8Cr3MoV(or called MC3A, MC3); 5%Cr series, such as 8Cr5MoV(or called MC5) etc; 8%Cr series, such as 9Cr8Mo1V(or semi high speed steel—SHSS).
Technical features and applications of forged steel cold mill work rolls:
Material | Hardened depth | Wear resistance | Recommended applications |
2%Cr | 8-15 | ≈1.0 | Small/medium size 4 high or 6 high single stand cold mill, skin pass mill etc. |
3%Cr | 15-25 | ≈1.2 | Medium /large size 4 high or 6 high single stand cold mill, skin pass mill etc. large size cold tandem mill |
5%Cr | 20-40 | ≈2.3 | Large size cold tandem mill, large single stand cold mill, skin pass mill etc. |
8%Cr | >20 | >5.0 | Silicon steel cold mill, tinplate cold mill etc. large size cold tandem mill. |
Through the adjustment of alloy elements and process improvement, the formation of special performance of personalized products, such as high homogeneity work roll, high wear-resistant work roll, anti-accident work roll, anti-roll impression work roll.
1. High homogenous work roll material segregation, organization unevenness is very small, roll body surface no color difference, mainly used in flat machine, galvanized wire polishing machine.
2. The high wear-resisting work roll not only improves the wear resistance, but also improves the roll printing resistance, which can be applied to the 4-5 stands of tandem rolling mill.
3. The accident resistant work roll has a small amount of accident grinding, which is suitable for rolling mills or racks where accidents often occur.
Technical service commitment of roll before, during and after sale
I. Pre-sale service:
1. Technical exchange:
a. Understand the basic parameters, operation and usage characteristics of the rolling mill.
b. Understand the varieties and characteristics of rolled products.
c. Understand the quality requirements of rolled products.
d. Understand the general and special requirements for roll performance.
e. Introduce the characteristics of various roller materials and varieties.
2. Put forward the proposal of roll matching scheme for rolling mill.
3. Improve the roller material and performance according to the use effect and user requirements.
Ii. In-sale Services:
1. Make the roll meet the user's requirements clearly marked.
2. Necessary protection shall be carried out on the roll to meet the protection requirements of users in the process of packaging, rust prevention, storage and transportation.
Ii. After-sales Service:
1. Guide roll use and maintenance and assist in improving roll grinding system.
2. Analyze abnormally failed rolls, provide relevant roll testing services (including magnetic particle testing, penetration testing, on-site hardness testing, ultrasonic flaw detection and on-site metallographic testing), and put forward suggestions or countermeasures to solve the problems.
3. Provide technical tracking services according to the actual situation.
4. Listen to users' information on the use of the roll, and provide roll adaptability improvement schemes according to the feedback of the use information.