High-strength high-speed steel roll

LMM 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

Brand name: LMM GROUP
Packing Details : Wooden box with fumigation or Wooden Fram
Delivery Details: 30~60days or Based on the quantity
Shipping: Sea freight、Land freight、Air freight
Customization:
Customized logo(Min. Order 1 piece)
Customized packaging(Min. Order 1 piece)
Graphic customization(Min. Order 1 piece)
Checking report: Material Report、Hardness Report、UT/MT Report、Dimensions checking report、Mechanical Property Test Report
Processing technology: casting, forging

LMM 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

Manufacture drawing	√
Process schedule with ETD date	√
QC checking of each process	√
Checking report	√

Photos &videos of each process	√
ISO 9001 certificate	√
Warranty Time	√
The third party Checking	√

Product name: High-strength high-speed steel roll
Packing Details : Wooden box with fumigation or Wooden Fram
Delivery Details: 30~60days or Based on the quantity
Shipping: Sea freight、Land freight、Air freight
Customization:
Customized logo(Min. Order 1 piece)
Customized packaging(Min. Order 1 piece)
Graphic customization(Min. Order 1 piece)
Checking report: Material Report、Hardness Report、UT/MT Report、Dimensions checking report、Mechanical Property Test Report

Manufacture drawing	√
Process schedule with ETD date	√
QC checking of each process	√
Checking report	√

Photos &videos of each process	√
ISO 9001 certificate	√
Warranty Time	√
The third party Checking	√

High speed steel rolls Application

At present, high-speed steel roll series products are widely used in:

● High-speed bar pre-finishing stand, finished product stand, finished product pre-rolling stand, pre-slicing stand, slitting stand of bar rolling mill

● High-speed wire rod mill pre-finishing mill

● Hot rolling narrow and medium wide steel rolling mill finishing mill

● Finishing stand of spring flat steel mill and small section steel mills such as angle steel and channel steel

Advantages of high speed steel rolls:

Advantages in high-speed steel roll materials

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.
Centrifugal casting high speed steel roll core is made of alloy ductile iron material, so the roll neck strength is high

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
high chromium cast iron	M₂₃C₆	Cr₂₃C₆	granular（2次）	1200
High nickel chromium molybdenum cast iron	M₃C	Fe₃C	mesh	840-1100

Advantages of the metallographic structure of high-speed steel rolls

It can be seen from the metallographic photos that the metallographic structure of the high-speed steel roll is much better than other materials in terms of the shape, quantity, size and distribution of carbides, as well as the matrix structure and grain size.

Advantages in the use of high-speed steel rolls

During the use of high-speed steel rolls, under good cooling conditions, a thin and dense oxide film is formed on the surface of the roll body. This uniform, thin and dense oxide film can exist for a long time without falling off, so that the wear resistance of the high-speed steel roll is significantly improved.

Other main advantages of high-speed steel rolls

High-speed steel rolls have good thermal stability, and the roll surface has high hardness and good wear resistance at rolling temperature.
The high-speed steel roll has good hardenability, and the hardness from the surface of the roll body to the inside of the working layer hardly decreases, thus ensuring that the roll has the same good wear resistance from the outside to the inside.

High speed steel rolls Production Process

Product design→ Roll blank design→ Roll blank manufacturing→ Roll blank acceptance→ Annealing→ Rough turning→ Ultrasonic flaw detection→ High temperature quenching→ Low temperature tempering→ Ultrasonic flaw detection→ Finishing→ Ultrasonic flaw detection→ Roll body grinding→ Roll numbering→ Inspection→ Cleaning → Packing → Shipping → Warehousing → Inspection → Use and Maintenance → On-site Communication → Design Improvement.

As can be seen from the flow chart, roll manufacturing forms a closed-loop system from product design, production and manufacturing, use and maintenance, and improved design, and the quality of rolls is constantly improving.

High speed steel rolls Production equipment

High speed steel rolls Testing standards

The manufacture and inspection of high-speed steel roll products are strictly in accordance with the relevant requirements of national standards such as GB/T 13313-2008 “Roll Shore and Leeb Hardness Test Methods” and GB/T 1503-2008 “Cast Steel Rolls”.

Testing regulations:

Check the size and surface quality of each part one by one;
Carry out ultrasonic flaw detection three times one by one;
Carry out hardness test piece by piece;
The depth of the hardened layer of the roll body is affected by the manufacturing process.

High speed steel rolls Performance and reporting

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.

The following table shows the use effect of high-speed steel rolls on continuous bar rolling mills:

Our Customers Have to Say

After passing the inspection with LMMGROUP, a trial plan was proposed for the company's high-speed steel rolls in May 2019. The planned number is 4 pairs (8 pieces), and the trial has been completed. Although the price of LMMGROUP is 1.22 times that of the current rolling stock, through this trial, the data shows that the amount of steel passing through is more than 1.3 times higher than the current rolling stock, and the rolling groove wear of the off-line rolling is better than the current rolling stock. If Long-term use in batches also reduces the amount of turning per turn and increases the number of rolls used. For the trial specification, we chose the medium 14 specification with a higher accident rate, because the advantages of the roll were not fully exerted due to batch reasons and the impact of production accidents. According to the trial results, it is inferred that the rolling series will be better when used in 16-20 specifications.

A STEEL

On September 10, 2015, in the rolling process of the steel rolling mill, the LMMGROUP high-speed steel bar rolling experiment was carried out on the first bar line C12 to four cuts, and C14 three cuts to K1, K2, K3, and K4. According to the trial situation, The average amount of steel passing through LMMGROUP rolling is about 50%-60% of the alloy rolling spoke. The processing difficulty of high-speed steel is low, and the processing cost is lower than that of the alloy rolling wheel. Our factory can achieve normal processing.

B STEEL

LMMGROUP provides our factory with 8 @380×650 high-speed steel rolls for K1 (finishing), K2 (pre-finishing), K3 (slicing), K4 (pre-slicing), which are used to make 12mm rebar. After the first online use: K1 single-channel steel throughput averaged 410 tons, K2 single-channel steel throughput averaged 840 tons, K3 single-channel steel throughput was 2860 tons, and K4 single-channel steel throughput was 2910 tons. There is no abnormal condition in the groove, and the hardness of the wheel is uniform, which is convenient for the repair and processing of the groove. During the period, LMMGROUP sent relevant technical personnel to follow up and guide on-site, and the effect was better in our factory.

C STEEL

1. According to the use situation, the use of cutting passes is more obvious, from the use of one groove per shift to the use of 3 shifts for one groove, which greatly reduces the parking time of the shift and the cost of using rolls, Reduce roll changes on night shifts.
2. High-speed steel rolls have good wear resistance, which is more obvious in the use of 15# rolls. During the production process, the strip shape control is stable, the gap between the rolls is large, and the negative deviation fluctuation is small, which is very useful for improving the quality of the finished product. good improvement.
3. At present, the ordinary roll is 0.55 yuan/ton, and the use of high-speed steel is 0.33 yuan/ton, which can greatly reduce the cost and increase the profit of the workshop.

D STEEL

The trial data shows that the ∮370mm high-speed steel roll produced by LMMGROUP has far exceeded the single-groove assessment value of 1,500 tons in the "Roll Ordering Technical Agreement", and the effect is good.

E STEEL

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hss rolls

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One of the largest enterprises in China specializing in the production of high-performance high-speed steel roll series products

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86(411) 84174804

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Our Clients Give The Best Feedback

Although the price of LMMGROUP is 1.22 times that of the current rolling stock, through this trial, the data shows that the amount of steel passing through is more than 1.3 times higher than the current rolling stock, and the rolling groove wear of the off-line rolling is better than the current rolling stock.

According to the trial situation, The average amount of steel passing through LMMGROUP rolling is about 50%-60% of the alloy rolling spoke. The processing difficulty of high-speed steel is low, and the processing cost is lower than that of the alloy rolling wheel.

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.

Founded in 2007, LMM GROUP mainly produces all kinds of metallurgical rolls for various types of steel, bar, high-speed wire and strip hot and cold plate and strip rolling mills.

The company covers an area of 100,000 square meters, including two complete production lines for cast rolls and forged steel rolls, processing workshops, product research and development centers, testing centers, training centers and office buildings and other supporting facilities. The factory environment is very beautiful.

Pre-Sales Service

* Inquiry and consulting support.

* Planning layout and Design requires machinery

* Welcome visit our Factory.

* The production process and before leaving the factory, all performance indicators are strictly tested, and the professional QC team controls according to the process.

After-Sales Service

* Engineers available to service machinery overseas.

* IN-TIME delivery goods.

* The quality is tracked throughout the process, and the installation and use are guided throughout the process.

* Long-term technical support.

* Stick to the agreement, do not do anything that violates the agreement, stick to the spirit of the contract to the end.

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

High-strength high-speed steel roll

High speed steel rolls Application

Advantages of high speed steel rolls:

High speed steel rolls Production Process

High speed steel rolls Production equipment

High speed steel rolls Testing standards

High speed steel rolls Performance and reporting

Our Customers Have to Say

hss rolls

Need For Some Help ?

phone

mail

Our Clients Give The Best Feedback

Rolling mill rolls product

Product advantage

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

Pre-Sales Service

After-Sales Service

86-411-84174804

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