The world No. 1 in crude steel production steel plant, over 70% of the HSS for bar and wire are from us.

LMM GROUP main products focus on the cold and hot plate & wide strip mill rolls and heavy section mill rolls and big casting & forging pieces.

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Rolling mill rolls material choose


Description: Rolling mill rolls professional manufacturer, Has 20+ years of production experience

Keyword: Rolling mill rolls material

Rolling mill rolls material choose

Alloy chilled cast iron roll

Alloy chilled cast iron roll (roll ring) is a cast iron roll manufactured by using the supercooling degree of molten iron itself and the quenching of the mold surface, and adding Ni, Cr, and Mo alloy elements at the same time. The matrix structure of the working layer of the roll body is basically There is no free graphite, so it has high hardness and excellent wear resistance.

This kind of material can be used to produce large-scale rolls by static compound casting process, so that the roll body has high hardness and the roll neck has high strength and toughness, showing good thermal stability and accident resistance.

Application: Small bar, wire rod mill and finishing mill stand of narrow strip mill, seamless steel pipe mill stretching and reducing roll ring, three-roll medium plate mill, hot-rolled stacked thin plate mill.

Alloy unbounded chilled cast iron roll

Alloy unbounded chilled cast iron rolls (roll rings) are distinguished from chilled cast iron rolls by the presence of fine graphite precipitates in their working layers. Graphite is uniformly dispersed throughout the roll body section, and its number and size increase with depth. Due to the addition of alloying elements such as manganese, chromium, nickel, molybdenum, and the existence of a small amount of fine graphite, not only the anti-flaking, thermal cracking and wear resistance of the roll are improved, but also the working layer of the roll body has a smaller Hardness drop. The fine graphite pores on the surface also improve the bite ability of the roll.

Uses: bar, wire rod, middle and finish rolling stands of section steel mills, and reducing roll rings of seamless steel pipe mills.

Alloy ductile iron roll

Alloy ductile iron roll (roller ring), characterized by spherical graphite in the matrix structure, can be made into ordinary ductile iron, large alloy ductile iron, and pearlitic ductile graphite by adjusting nickel, chromium, molybdenum alloying elements and specific heat treatment systems Different series of rolls (rings) in cast iron and acicular ductile iron. These products have good strength, high temperature performance and accident resistance, and the hardness drop of the working layer is extremely small.

Uses: bar, wire, section steel mill rough, intermediate rolling stand, rail beam edge rolling vertical roll

High nickel chromium unbounded chilled cast iron roll

High-nickel-chromium unbounded chilled composite cast iron roll is a high-performance roll manufactured by centrifugal or full flushing method. By increasing the content of nickel, chromium, molybdenum and other alloying elements, high microhardness of microstructure and carbide can be obtained; combined with special heat treatment to obtain The working layer has a uniform, dense structure and small hardness drop; it also contains a small amount of free graphite, so it has good wear resistance, thermal crack resistance, peeling resistance and indentation resistance.

The thickness of the outer layer can be adjusted according to the needs, and the core is made of ductile gray cast iron or high-strength ductile iron, so that the core and roll neck have satisfactory strength and toughness. Sufficient water cooling is necessary during use.

Uses: Work rolls in the back section of hot strip continuous rolling and finishing rolling, work rolls in the rough rolling and finishing stands of wide and medium plate mills, work rolls in hot zone (plate) four-roll tempering mills, backup rolls, and cross-cutting pass rolls.

High chromium composite casting roll

The working layer of high-chromium composite roll contains 6~22% chromium alloy, and the core is high-strength ductile iron. According to the different carbon content, it is divided into high chromium cast steel rolls and various cast iron rolls. Due to the action of a large amount of chromium, the carbide in the structure is M7C3 type, with high hardness, good toughness and wear resistance, and the alloy content in the matrix structure is high, and after special heat treatment, it has good comprehensive mechanical properties at high temperature.

When used for strip hot rolling, high chromium cast steel and high chromium cast iron rolls can be selected according to the number of shifts and water cooling conditions. High chromium composite rolls can be used in cold rolling mills, work rolls in skin pass mills, and can be used to make roll ring products.

Uses: Roughing work rolls for hot strip rolling mills, cold strip mill work rolls, medium plate mill work rolls, wide medium plate mill work rolls, bar and wire mills and seamless steel pipe straightening machine rolls.

Alloy cast steel roll

Alloy cast steel rolls are manufactured by smelting high-quality molten steel in electric furnaces and refining furnaces, coupled with advanced casting and heat treatment technology, and have high strength, good thermal crack resistance, toughness and wear resistance.

use: Square and slab roughing mills, section steel rough and medium 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 roll

Semi-steel rolls include roll products such as integral rolls, composite rolls, and roll sleeves. It is made by adding alloy elements such as Mo, Cr, Ni, and other trace alloys to molten steel with high carbon content, and adopts a special heat treatment process. It has high Wear resistance, strong toughness and good thermal crack resistance, almost no hardness drop in the working layer.

Application: Rough rolling, finish rolling front section, vertical roll of strip hot rolling mill; rough rolling, intermediate rolling and pre-finishing stand of section steel, rail beam mill and bar mill; roll ring and roll sleeve of universal rolling mill and cantilever rolling mill.

Graphite cast steel roll

The performance of graphite steel rolls is similar to that of semi-steel rolls, but it is characterized by the presence of a small amount of graphite in the structure. The presence of a small amount of graphite can improve the thermal cracking resistance and oxidation resistance of the roll, so it is suitable for preliminary rolling or rough rolling. rolling operation.

Application: Used for strip steel hot rolling mills, roughing stands of two-roll reversible rolling mills for medium and wide thick plates, blooming mills, billet continuous rolling mills, section steel and rail beam rolling mills, especially for deep-groove rolls and strip steel hot continuous rolling mills Rough rolling stand.

Composite cast steel support roll

The cast steel support roll manufactured by composite casting process, due to the addition of nickel, chromium, molybdenum and other alloying elements in the outer layer, and after special heat treatment, its metallographic structure is: tempered sorbite, bainite and a small amount of uniform distribution of fine carbides. The core and roll neck of the composite cast steel backup roll are made of high-quality low-carbon steel or low-alloy steel, so this roll has high wear resistance, good spalling resistance and toughness.

Application: Rough rolling and finishing rolling stands of various cold and hot strip rolling mills, and can also be used in various medium and heavy plate and wide plate rolling mills and steckel rolling mills.

High speed steel composite roll

The high-speed steel composite roll is manufactured by vertical centrifugal share and casting process. The outer layer is made of high-speed steel with high hardness and excellent high-temperature wear resistance, and the core is made of high-strength and toughness ductile iron. The comprehensive performance achieves a good combination of high wear resistance and toughness.

     These rolls are manufactured with a high content of alloying elements and a special heat treatment process. The microstructure of the outer layer of the roll is a proper amount of MC, M2C and M6C dispersed carbides with extremely high microhardness distributed on the martensite matrix, and the hardness drop is extremely small. High content of alloying elements and secondary hardening effect make high-speed steel rolls have good high-temperature wear resistance. The surface hardness does not drop significantly at a high temperature of 550°C, and its wear resistance is 3-5 times higher than that of traditional high-nickel-chromium infinitely chilled and high-chromium cast iron rolls.

Uses: Working rolls of the finishing stand of hot strip rolling mills, working rolls of cold strip rolling mills, rods and wires, roll rings and roll sleeves of universal H-beam mills.

Forged Steel Cold Roll

Forged steel cold rolls include cold-rolled work rolls and back-up rolls. These rolls use advanced smelting equipment (electric arc furnace), refining equipment (electroslag remelting and ladle refining) and forging equipment (3150t hydraulic press) to manufacture alloys with excellent metallurgical quality For the forged steel roll blank, in terms of heat treatment, computer control technology is applied to ensure that the hardness of the roll and the depth of the hardened layer on the roll body have good reproducibility. In terms of heat treatment process, sufficient preparatory heat treatment and specific induction hardening (continuous and overall), cryogenic treatment and tempering are adopted to make the roll obtain a high and uniform working layer with a hardened layer depth of more than 30mm, which is sufficient Excellent wear resistance, toughness and accident resistance. It has the advantages of high rolling capacity, low energy consumption and long service life.

Forged steel hot roll

The forged steel hot roll is made of high-quality alloy forged steel billet. Through special heat treatment, it has satisfactory hardness of the roll body and depth of hardened layer. While obtaining good wear resistance, it also has good strength, toughness and bite comprehensive performance. These rolls are used in hot strip rolling and profile mills.

Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.

A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shippment.

Always a pre-production sample before mass production;
Always final Inspection before shipment;
During the epidemic, provide remote detection technical support

Tell us a little about your application and we’ll get back to you to finalize a quotation to meet your needs as quickly as possible.

Rolling mill rolls product

Classification by roll material:

Cast iron mill rolls

  • Alloy indefinite chilled cast iron rolls
  • Alloy chilled cast iron rolls
  • Alloy SG ductile cast iron roll
  • Pearlitic ductile cast iron roll
  • Bainite ductile cast iron roll
  • Centrifugal cast iron roll

Cast steel mill rolls   

  • Alloy cast steel rolls
  • Semi-steel roller
  • Graphite steel rolls
  • High-chromium steel roll
  • High-speed steel roll

Forging mill rolls

Sort by position on the rolling mill:

Work rolls
backup rolls

Intermediate roll

Product advantage

The world No. 1 in crude steel production steel plant, over 70% of the HSS for bar and wire are from us.

LMM high-speed steel rolls have higher steel passing per groove (times) due to their good wear resistance, which saves roll changing time, improves rolling mill operation rate, reduces roll consumption, and improve the overall efficiency of the factory.
Generally, the amount of steel passing in a single groove (times) is 3 to 5 times that of cast iron rolls.

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