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HSS ROLLS Material

The high-speed steel roll material contains high alloy elements such as vanadium, tungsten, chromium, molybdenum, niobium, etc. The types of carbides in the roll structure are mainly MC type and M2C type. Compared with ductile iron rolls and high-nickel-chromium rolls, the single-groove (time) steel passing is higher, which saves roll changing time, improves rolling mill operation rate, reduces roll consumption, reduces production costs, and improves the overall benefit of the factory.

The high-speed steel roll material has a large expansion coefficient and good thermal conductivity. While the roll wears a small amount of the groove during the rolling process, due to the expansion of the high-speed steel material itself, the hole shape continues to become smaller. Therefore, the high-speed steel roll is rolling. During the process, the change of the rolling groove is small, and the consistency of the pass size is maintained for a long time, especially when rolling bars or rebars, it is more conducive to control the negative tolerance of the rolling material.

Since the core of the centrifugally cast high-speed steel roll is made of alloy ductile iron, the roll neck strength is high.

An obvious trend in the development of rolls is the extensive use of alloying elements to form various carbides in the roll material. The hardness, morphology, quantity and distribution of carbides, as well as the structure and properties of the matrix, have an impact on the wear resistance, thermal fatigue resistance, thermal fatigue resistance of the roll. The properties of resistance to peeling and surface roughness play a decisive role. The following table shows the types and microhardness of alloy carbides formed by different material rolls.

Roll material

Main Carbide Type

carbide form

Carbide microhardness (HV)

high speed steel

 

 

MC

VC

granular

2800

WC

granular

2400

NbC

granular

3000

TiC

granular

3200

M2C

Mo2C / W2C

stick / feather

2000

M6C

Fe3 / W3C

fishbone

1500-1800

high chromium cast iron

M7C3

Cr7C3

chrysanthemum

1200-1600

M23C6

Cr23C6

granular

1200

High nickel chromium molybdenum cast iron

M3C

Fe3C

mesh

840-1100

Etallographic structure of high-speed steel rolls and rolls of other materials

The performance of the roll depends on the microstructure of the final roll. For cast high-speed steel, the morphology of carbides cannot be changed by deformation. It can only be changed by adjusting the chemical composition, solidification conditions and heat treatment process to meet the requirements of the roll performance.

Obtaining high hardness granular carbide and fine matrix structure is the basic guarantee to improve the performance of the roll. It can be seen from the metallographic photos that the morphology, quantity, size and distribution of carbides in the metallographic structure of the high-speed steel roll, as well as the matrix structure and grain size are much better than other materials.

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As professional one-stop solution provider, LIAONING MINERAL & METALLURGY GROUP CO., LTD(LMM GROUP) Established in 2007, and focus on engineering research & design, production & delivery, technology transfer, installation & commissioning, construction & building, operation & management for iron, steel & metallurgical industries globally. 

Our product  have been supplied to world’s top steel manufacturer Arcelormittal, TATA Steel, EZZ steel etc. We do OEM for Concast and Danieli for a long time.

LMM Main product series

Core technology products:

  • magnesia carbon brick
  • slide gate plate
  • graphite electrode

Core technology products:

  • Hss roller
  • cast steel rolls
  • tungten carbide ring roller

Core technology products:

  • copper mould tube
  • copper mould plate
  • assembly & cooling jackts

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