Alloy chilled cast iron rolls
Alloy chilled cast iron rolls (roll rings) are a type of cast iron roll manufactured by utilizing the supercooling of molten iron itself and the rapid cooling of the mold surface, while adding Ni, Cr, and Mo alloying elements. The working layer matrix of the roll body basically has no free graphite, so it has high hardness and excellent wear resistance.
This type of material can be used to produce large-size rolls using a static composite casting process, giving the roll body high hardness and the roll neck high strength and toughness, exhibiting good thermal stability and accident resistance.
Application：
| CC-1 |
Small bar and wire rod mills and narrow strip steel mill finishing mill stands. |
| CC-2
CC-3 |
Small bar and wire rod mills, narrow strip mill finishing mill stands, and seamless steel pipe mill reducing roll rings. |
| CC-4 |
Three-roll medium plate mill and hot-rolled thin plate mill. |
Alloy Boundless Chilled Cast Iron Rolls
Alloy-bonded chilled cast iron rolls (roll rings) are distinguished from chilled cast iron rolls by the presence of fine graphite precipitates in their working layer. Graphite is uniformly dispersed throughout the roll cross-section, with its quantity and size increasing with depth.
The alloy-bonded chilled cast iron rolls provided by our company, due to the addition of alloying elements such as manganese, chromium, nickel, and molybdenum, along with a small amount of fine graphite, not only improve the rolls’ resistance to spalling, thermal cracking, and wear, but also result in a smaller hardness difference in the working layer of the roll body. The micro-graphite pores on the surface also improve the rolls’ gripping ability.
Application：
| IC-1 |
Intermediate and finishing mill stands for bar, wire rod and section steel rolling mills |
| IC-2
IC-3 |
Bars, wire rods, intermediate and finishing mill stands for section steel rolling mills, and tension and reduction roll rings for seamless steel pipe rolling mills. |
Alloy ductile iron rolls
Alloy ductile iron rolls (roll rings) are characterized by the spherical shape of graphite in their matrix. By adjusting the nickel, chromium, and molybdenum alloying elements and specific heat treatment processes, different series of rolls (roll rings) can be manufactured, including ordinary ductile iron, large alloy ductile iron, pearlitic ductile iron, and needle-shaped ductile iron. These products possess excellent strength, high-temperature performance, and accident resistance, with minimal hardness variation in the working layer.
Application：
| SGP-1 |
Bar, wire rod, and section steel rolling mill roughing and intermediate rolling mill stands, rail beam edge rolling vertical rolls. |
| SGP-2 |
Roughing and intermediate rolling mill stands for bar, wire rod, and section steel rolling mills. |
| SGP-3 |
Large primary rolling mill. |
| SGP-4 |
Roughing and intermediate mill stands for section steel continuous rolling mills, roughing and intermediate mill stands for bar and wire rod mills, and tension and reduction roller rings for steel pipe mills. |
| SGAC |
Rolls and roll rings of intermediate and finishing mill stands for section steel continuous rolling mills, rolls and roll rings of seamless steel pipe rolling mills, and rolls and roll rings of intermediate, pre-finishing, and finishing mill stands for bars, wire rods, and rebar rolling mills. |
High-nickel-chromium boundless chilled cast iron rolls
High-nickel-chromium boundless chilled composite cast iron rolls are high-performance rolls manufactured using centrifugal or full-washing methods. By increasing the content of alloying elements such as nickel, chromium, and molybdenum, high microstructure and carbide microhardness are achieved. Combined with special heat treatment, a uniform, dense working layer with minimal hardness variation is obtained. Simultaneously, a small amount of free graphite is included, resulting in excellent wear resistance, thermal cracking resistance, spalling resistance, and indentation resistance.
The outer layer thickness can be adjusted to meet specific needs. The core uses tough gray cast iron or high-strength ductile iron, giving the core and roll neck satisfactory strength and toughness. Sufficient water cooling is essential during use.
High-chromium composite casting rolls
High-chromium composite rolls contain 6-22% chromium alloy in the working layer, with a core of high-strength ductile iron. Depending on the carbon content, they are classified as high-chromium cast steel rolls and various cast iron rolls. Due to the high chromium content, the carbides in the microstructure are of the M7C3 type, exhibiting high hardness, good toughness, and wear resistance. Furthermore, the high alloy content in the matrix, combined with special heat treatment, results in excellent comprehensive high-temperature mechanical properties.
When used for hot rolling of strip steel, high-chromium cast steel or high-chromium cast iron rolls can be selected according to the number of stands used and water cooling conditions. High-chromium composite rolls can be used in cold rolling mills, leveling mill work rolls, and can also be used to make roll ring products.
Application：
| HCr-1 |
Roughing rolls for hot strip mills and work rolls for wide, medium and heavy plate mills. |
| HCr-2 |
Work rolls for the finishing section of hot strip rolling mills, rolls for bar and wire rod mills and seamless steel pipe straighteners |
| HCr-3 |
Cold strip mill work rolls, leveling work rolls |
| HCrS |
Work rolls for roughing and finishing sections of hot strip rolling mills, work rolls for cold strip rolling mills, and work rolls for medium plate rolling mills. |
Alloy cast steel rolls
Alloy cast steel rolls are manufactured using high-quality molten steel smelted in electric furnaces and refining furnaces, combined with advanced casting and heat treatment technologies. They possess high strength, good resistance to thermal cracking, toughness, and wear resistance.
Application：
Square and slab primary rolling mills, section steel roughing and intermediate rolling mills, strip steel hot continuous rolling mills, scale-breaking large vertical rolls and two-roll roughing mills, medium plate two-roll roughing mills, hot-rolled narrow strip steel support rolls, etc.
Semi-steel rolls
Semi-steel rolls include integral, composite, and sleeve roll products. They are manufactured by adding alloying elements such as Mo, Cr, and Ni, as well as other trace alloys, to molten steel with high carbon content and using a special heat treatment process. They have high wear resistance, strong toughness, and good resistance to thermal cracking, and there is almost no hardness drop in the working layer.
Application：
Roughing and finishing mills and vertical rolls for hot strip rolling mills; roughing, intermediate, and pre-finishing mill stands for section steel, rail beam, and bar mills; roll rings and roll sleeves for universal mills and cantilever mills.
Graphite cast steel rolls
Graphite steel rolls have similar properties to semi-steel rolls, but are characterized by the presence of a small amount of graphite in their structure. The presence of a small amount of graphite can improve the roll’s resistance to thermal cracking and the resistance to iron oxide scale adhesion, thus making it suitable for primary rolling or roughing operations.
Application：
Used in hot strip rolling mills and roughing stands of medium-width and heavy plate two-high reversible rolling mills.
Used in primary rolling mills, billet rolling mills, and mills for section steel and rail beams, especially suitable for deep-hole type rolls and roughing stands of hot strip rolling mills.
Composite cast steel support roller
Cast steel support rolls manufactured using a composite casting process have an outer layer with added alloying elements such as nickel, chromium, and molybdenum, followed by special heat treatment. Their microstructure consists of tempered sorbite, bainite, and a small amount of evenly distributed fine carbides.
The core and neck of the composite cast steel support roll are made of high-quality low-carbon steel or low-alloy steel, thus giving this type of roll high wear resistance, good anti-stripping properties, and high toughness.
Application：
Work rolls for hot strip rolling mill finishing mills, work rolls for cold strip rolling mills, bar and wire rod mill roll rings, and roll sleeves for universal mesh steel rolling mills.
Forged steel cold rolling rolls include cold rolling work rolls and support rolls. These rolls are manufactured using advanced smelting equipment (electric arc furnace), refining equipment (electroslag remelting and ladle refining), and forging equipment (3150t hydraulic press) to produce high-quality alloy forged steel roll blanks. In heat treatment, computer-controlled technology ensures excellent reproducibility of roll hardness and hardened layer depth. The heat treatment process employs thorough pre-heat treatment, specific induction hardening (continuous and integral), deep cryogenic treatment, and tempering to achieve a high-hardness and uniform working layer with a hardened layer depth exceeding 30mm, providing sufficient wear resistance, toughness, and accident resistance.
Modern wide-band cold continuous rolling mills both domestically and internationally have achieved satisfactory results using these high-quality work rolls provided by our company.
Forged steel hot rolling rolls
Forged steel hot rolling rolls are made from high-quality alloy forged steel roll bodies. Through special heat treatment, they achieve satisfactory roll body hardness and hardened layer depth, resulting in excellent wear resistance as well as good comprehensive properties such as strength, toughness, and bite-in.
These rolls are used in hot rolling mills for plate and strip and section steel. Our company’s coffin rolls are of high metallurgical quality, diverse in variety, complete in grades, and highly applicable. The welded pipe rolling mill rolls manufactured under the code FSH-10 meet the technical performance requirements of users. The quality of our hyperbolic straightening rolls is among the leading in China. We have also developed non-ferrous metal casting and rolling mill rolls and sleeves.
