Introduction
The semi-steel adamite roll is cast as a whole and there is no weak interface in compound casting roll, thus it has a better capacity, strength and toughness than cast iron roll. This kind of mill rolls can be used as work roll, back-up roll and vertical roll for large-class and medium-class rough rolling mill and intermediate rolling mill of section steel, wire rod, rail beams, steel billet, hot rolling steel strip.
Most of the semi-steel rolls are produced by the static integral casting method. It must be subjected to high-temperature diffusion annealing. Generally, semi-steel rolls are required to control the total amount of non-metallic inclusions below 0.05%. The centrifugal composite semi-steel back-up rolls are made of semi-steel material, the body and neck of the rolls are made of nodular cast iron, and they have been successfully used in hot-rolled strip steel finishing mill. The semi-steel roll ring is produced by composite centrifugal casting. The outer layer of the roll ring is high-carbon semi-steel. The inner layer of the roll ring is graphite steel or ductile iron. Use a high-speed rotating centrifuge to make two different types of molten steel poured and cast.
Chemical Composition
|
Alloy Materials |
C |
Si |
Mn |
P |
S |
Ni |
Cr |
Mo |
|
ZuB140CrNiMo |
1.30~1.50 |
0.30~0.60 |
0.70~1.10 |
≤0.035 |
≤0.030 |
0.20~0.80 |
0.80~1.20 |
0.20~0.60 |
|
ZuB160CrNiMo |
1.50~1.70 |
0.30~0.60 |
0.70~1.10 |
≤0.035 |
≤0.030 |
0.20~1.00 |
0.80~1.20 |
0.20~0.60 |
|
ZuB180CrNiMo |
1.70~1.90 |
0.30~1.00 |
0.70~1.20 |
≤0.035 |
≤0.030 |
0.60~1.50 |
1.00~1.50 |
0.20~0.80 |
|
ZuB200CrNiMo |
1.90~2.10 |
0.30~1.00 |
0.70~1.20 |
≤0.035 |
≤0.030 |
1.00~2.00 |
1.20~2.00 |
0.20~0.80 |
Physical Properties
|
Alloy Materials |
Roll-body hardness HSD |
Tensile strength Mpa |
Ductility % |
Impact toughness J/cm |
|
ZuB140CrNiMo |
35~45 |
≥590 |
≥1.0 |
≥4 |
|
ZuB160CrNiMo |
38~53 |
≥540 |
≥1.0 |
≥4 |
|
ZuB180CrNiMo |
42~55 |
≥500 |
≥0.5 |
≥4 |
|
ZuB200CrNiMo |
45~60 |
≥450 |
≥0.5 |
≥4 |
Metallographic Structure
The metallurgical structure of roll-body work layer: Pearlite + carbide or fine pearlite + a little bainite + carbide
