Our company now develops and produces wear-resistant steel mainly include NM300, NM360, NM400, NM450, NM500, NM550, NM600, NM300 is mainly developed for concrete mixer trucks, using NM300 instead of 520JJ, can enhance the wear-resistant performance by 1.5 times, reduce the thickness of the material used for concrete mixer trucks, reduce the weight of concrete mixer trucks. NM400 and NM450 are widely used in all kinds of mining dump trucks, city dump trucks and other fields, using NM400 and NM450 processing of U-type mining dump trucks and city compartments dump trucks can reduce weight by 50%, significantly improve the operating efficiency of the vehicle and reduce operating costs.

Delivery status: four cut edge plate delivery, steel plate to quenched + tempered or TMCP + tempered state delivery.

 

Delivery standard

CHINA GRADE	CHINA STANDARD	EQUAL GRADE
		JFE	SSAB
NM300	GB/T 24186-2009	EH300	HARDOX300
NM360	GB/T 24186-2009	EH360	HARDOX360
NM400	GB/T 24186-2009	EH400	HARDOX400
NM450	GB/T 24186-2009	EH450	HARDOX450
NM500	GB/T 24186-2009	EH500	HARDOX500
NM550	GB/T 24186-2009	EH500	HARDOX550
NM600	GB/T 24186-2009	EH500	HARDOX600

 

Availability

CHINA GRADE	Available thickness ，mm	Available width，mm	Available length，mm
NM300	3-25.4	900-2000	2000- 16000
NM360	3-25.4	900-2000	2000- 16000
NM400	3-25.4	900-2000	2000- 16000
NM450	3-25.4	900-2000	2000- 16000
NM500	3-25.4	900-2000	2000- 16000
NM550	4-25.4	900-2000	2000- 16000
NM600	4-25.4	900-2000	2000- 16000

Our wear-resistant steel is delivered in steel plate condition according to GB/T24186-2009.

 

Mechanical properties

CHINA GRADE	thicknesses /mm	tensile strength a      Rm/MPa	Elongation at break a A50mm/%	-20°C impact absorption energy (longitudinal)a      KV2/J	Surface Brinell hardness HBW
NM300	≤25.4	≥ 1000	≥ 14	≥24	270~330
NM360	≤25.4	≥ 1100	≥ 12	≥24	330~390
NM400	≤25.4	≥ 1200	≥10	≥24	370~430
NM450	≤25.4	≥ 1250	≥7	≥24	420~480
NM500	≤25.4	—	—	—	≥470
NM550	≤25.4	—	—	—	≥530
NM600	≤25.4	—	—	—	≥570
aTensile strength, elongation, impact work as a special requirement of performance, such as the user is not specified in the contract, then only guaranteed Brinell hardness.

Product Applications

Our wear-resistant steel plates can be used to manufacture top-quality equipment and spare parts that can withstand years of industrial and mining tests to maximize life, reduce the risk of failure and increase productivity. They are mainly used in equipment wear parts, dump truck compartments, concrete mixer trucks, underground mines, cement industry, road construction industry, mining stone and open pit mines and metallurgical industry.

Dump Truck

With the increase of national environmental protection pressure, now all levels of governments have made corresponding hard regulations on the self-weight of engineering vehicles, so no matter from the economic or energy-saving and environmental protection considerations, wear-resistant dump trucks are an inevitable trend of dump trucks in the future. LISCO's wear-resistant steel is now widely used in major dump truck manufacturers.

Concrete Mixer

Concrete mixer trucks are mainly used for 520JJ, but because the wear resistance of 520JJ can not meet the needs of customers, many concrete mixer trucks hope to introduce better wear resistance than 520JJ material, concrete mixer trucks with NM300 has economic advantages: less material, lighter weight, higher wear resistance!

Quarrying and Open Pit Mining

Quarrying and open-pit mining operations for the equipment requirements are very high, in terms of equipment wear resistance, such as improper selection of materials will pay a high price, Liansteel wear-resistant steel plate in this field in the production of various aspects of the application has significant advantages. Shovels, bulldozers, mining dump trucks, excavators, carriages and knife plate wear components, can choose LYS steel wear-resistant steel plate NM400/NM450NM500 made. Wear-resistant components of quarrying and open-pit mining equipment such as crusher, feeder, loader, screen, loader, etc. can be made of LYS steel wear-resistant plate NM450 or NM500.

Underground mine

Underground mining operations for the high requirements of the equipment, as far as wear resistance of the equipment is concerned, you can use LYS steel wear-resistant steel plate 360/400/450/500 product series, the steel plate is suitable for shovel trucks, buffer buckets, mining trucks, excavators, crusher, all kinds of hoppers, screening machines, chutes (coal mine scraper) and other underground mining equipment.

Cement Industry

Our wear-resistant steel plates are used in mining, transportation and processing in the cement industry, and can be widely used in the side and bottom plates of dump trucks, knife plates of excavators and loaders, feed hoppers and feed pans of crushers, side plates of conveyors, hoppers of elevators, and many kinds of equipment in raw material processing workshops, such as unloading chutes, grates, rotor sealing rings, and wear-resistant components such as separators and deflector plates, etc. For different applications in different places, different series of LYS steel plates (e.g. NM400/NM450/NM500/NM600, etc.) can be used. For wear-resistant steel components in different applications, different series of LYS steel wear-resistant plates (such as NM400/NM450/NM500/NM600, etc.) can be used.

Road construction industry

In the road construction industry, it can be widely used in the excavation, transportation and processing, etc. It can be widely used in the wear-resistant components such as hydraulic breakers, side and bottom plates of dump trucks, blade plates of excavators, bulldozers and loaders, crusher liners, chutes, shovel plates of graders and screeds of asphalt pavers, etc. For different applications, different series of our wear-resistant steel plates (e.g. NM400/NM450/NM500/NM600, etc.) can be used. For wear-resistant steel components in different applications, different series of our wear-resistant steel plates (such as NM400/NM450/NM500/NM600, etc.) can be used.

Metallurgical Industry

In the metallurgical industry in the ironmaking, gas production and other applications, can be widely used in the blast furnace roof rotating chute, fixed chute, liner, blast furnace purification waste hopper, ore with sieve, conversion shock absorber, transfer chute, discharge hopper, furnace bottom bedding feeder, coke with transfer equipment discharge chute, transfer chute, stacking chute, liner for the mixer, the combination of sintering plant transfer belt fallout chute containers, the liner of the feeding machine, raw material roll feeder Wear-resistant components. For wear-resistant steel components in different applications, you can choose different series of wear-resistant steel plate (NM400/NM450/NM500/NM600, etc.) products.

Plate shape of 4mm NM400

3mm NM400 plate shape

Product Performance

Reducing its own weight The steel plate is designed as a series of low-alloy, high-strength, wear-resistant steel plates based on the addition of a number of alloying elements required, and is processed through the steel plate so that it has a high degree of hardness (wear resistance) that can correspond to a variety of specifications. As a result, the weight of structural components can be significantly reduced.

Excellent welding performance Special consideration is given to the welding performance of the steel plate, and under the premise of ensuring the wear resistance and mechanical properties of the steel plate, the carbon equivalent of the steel plate is reduced as much as possible, and a unique composition design is carried out. The welding material is selected through the corresponding process test, and can be used with peace of mind in both the steel plate and the welding material.

Good toughness By strictly controlling the chemical composition, minimizing the content of harmful elements in steel, and selecting reasonable heat treatment conditions, the steel plate has good toughness. As a result, highly reliable structures can be constructed against brittle damage of wear-resistant components.

Good processing performance Due to the uniform control of steel plate properties, excellent performance match, and good toughness, the steel plate bending processing, as well as punching, cutting and other mechanical processing performance is excellent.

Thin thickness and good flatness We are able to produce steel plates with a thickness of 3-25.4mm, a width of 900-2050mm, and a maximum length of 16,000mm. We can provide the thinnest wear-resistant steel plate with excellent flatness in China.

 Steel plate quality control level

●High purity of steel with very low impurity content, which can reach [P]≤0.010%, [S]≤0.005%, [N]≤50ppm, [H]≤2ppm, [O]≤15ppm.

●Small fluctuation range of composition between different furnaces of the same specification of steel plate.

●The hardness of steel plate is controlled uniformly, and the difference of hardness of steel plate is small.

●The tolerance of steel plate is strictly controlled, the plate shape is flat, the surface is smooth and clean, and the unevenness can be controlled below 5mm/m.

Gas Cutting Characteristics

Like ordinary steel plates, steel can be processed by gas cutting and has good gas cutting characteristics. Considering the crack sensitivity of thick plates and high hardness grades, in order to prevent cracks in the steel plate during gas cutting, high gas and oxygen pressures and reduced cutting speeds should be selected for processing. Note: When cutting small components over a long period of time, the component hardness decreases with increasing temperature. A thin hardened layer with a depth of 2-3mm will be formed on the gas cutting surface due to the thermal influence.

Processing characteristics

Steel plate has good cutting and shearing properties. In steel plate machining, according to the hardness of the steel plate and the use of cutting tools, reasonable selection of the amount of feed and feed speed, usually choose the tool material for high-speed steel or carbide, especially cobalt alloy high-speed drills. Note: In the case of high hardness, the cutting volume and feed volume should be minimized.

Cold forming properties

Despite the high strength and hardness of the steel plate, its cold bending properties are good, and the steel plate can be processed by cold forming. To prevent cracking at the edges during cold forming of steel plates, the flame-cut or sheared edges in the bending area need to be trimmed. Note: As the yield strength increases, the deformation force and resilience required for the same thickness of steel plate should also increase. When steel plates are cold deformed, the following recommended values ("a" is the plate thickness) may be considered.

CHINA GRADE	Steel plate direction	Minimum bending radius	Minimum mold opening size
NM300      NM360	Horizontal      Vertical	3.5a      4 .5a	8a      10a
NM400	Horizontal      Vertical	4a      4 .5a	10a      12a
NM450	Horizontal      Vertical	6a      7a	12a      14a
NM500	Horizontal      Vertical	7a      9a	14a      18a

Hot forming properties

Steel plate has good hot working properties, steel plate can be molded at hot working temperature below 200℃. When the steel plate is heated above 250℃, the hardness of the steel plate will decrease. If the processing temperature exceeds the phase transition temperature (e.g. above AC1), after hot working, re-hardening is required to restore the hardness. Note: The hardness obtained by re-hardening may differ from the hardness measured at the factory due to differences in the processing and hardening equipment used in the production of the steel plate.

Welding Properties

Steel plates are usually welded by flux shielded arc welding and carbon dioxide gas shielded welding to obtain satisfactory welded joints. Alkaline electrodes with low residual moisture should be used for manual arc welding and, if necessary, the electrodes should be dried according to the manufacturer's requirements. For the implementation of high hardness steel plate welding, it is recommended to preheat the steel plate, the preheating temperature can be considered the following recommended values or see the welding specifications. Note: The weld filler material should be within the permissible limits of load on the member and wear on the weld, and soft welding consumables should be selected as much as possible (ER50-6 or 70KG high-strength wire is recommended). At the same time, note that the preheating temperature of the steel plate and components must be avoided to exceed 200 ℃, so as to avoid the phenomenon of hardness reduction. Recommended welding process is as follows:

1、 it is recommended to use solid wire for MAG welding, welding shielding gas for (15-25%) CO? Ar-rich gas, gas flow rate of 18-25lmin;.

2、Prioritize the use of low-hydrogen welding materials. When manual electrode welding, give priority to alkaline electrodes;

3、As far as possible to reduce the number of welding seams; as far as possible to use the longitudinal seam, as far as possible not to use the transverse seam. Welding as far as possible without swinging, the use of multi-layer multi-channel welding, welding heat input is recommended not to exceed 10KJ/cm. recommended maximum heat input Q = plate thickness t10; 4, the bevel shape is preferred to use the U-shaped bevel, the bevel shape is preferred to use the U-shaped bevel.

4、The bevel shape is preferred U-shaped, can reduce the proportion of base material into the weld metal, reduce the carbon content in the weld, to prevent cracks;

5、 Preheating is conducive to preventing cold cracks. When the overall preheating is difficult, local preheating can be used; when the room temperature is lower than 0 ℃ it is recommended to preheat;

6、Conventional welding consumables or high-strength welding consumables can be used:

Conventional welding consumables: available 50kg grade wire (e.g.: beam design mining truck, weld not bearing not wear) 

High strength welding consumables: available 70-80kg grade wire (e.g.: no beam mining truck, weld bearing, weld wear)

CHINA GRADE	plate thickness mm	preheating temperature℃	Remarks
NM300     NM360     NM400		/	No warm-up required
NM450	＜15     ≥15	/     140－ 190	No warm-up required
NM500	＜8     ≥8	/     150－200	No warm-up required

Performance Comparison

The wear-resistant steel produced by our company has excellent wear-resistant performance, the following is the comparison of the wear-resistant performance of Liansteel wear-resistant steel and the wear-resistant steel of famous foreign manufacturers.

1, NM400 and HARDOX400 sliding wear test data table

Wear stage	HARDOX400 Average thickness loss (μm injustice)	NM400 Average thickness loss (μm injustice)	Relative wear resistance (NM400/HARDOX400)
0~3min	3.950	3.696	1.069
3~6min	3.869	3.603	1.074
6~9min	3.666	3.556	1.031

 

2、NM450 and HARDOX450 Abrasive Wear Test Data Sheet

Table 1 Abrasive wear test results with impacts

Steel Type	Impact energy /J	Mass before wear /g	Mass after wear /g	Weight loss due to wear /g	Relative abrasion resistance
NM450	2	14.80762	14.7071	0. 10052	1.0625
HARDOX450		15.00051	14.89371	0. 10680	1
NM450	4	15.67336	15.50789	0. 16547	1.03197
HARDOX450		14.36629	14.19553	0. 17076	1

 

Table 2 Abrasive wear test results without impacts    
 

Steel Type	Wear time /h	Mass before wear /g	Mass after wear /g	Weight loss due to wear /g	Relative abrasion resistance
NM450	36	16.62430	16.60013	0.02417	1.093
HARDOX450		15.74163	15.71521	0.02642	1

 

3、NM500 and SB50 Abrasive Wear Test Data Sheet    
 

Wear time	SB50 Average wear rate /%	NM500 Average wear rate /%	Relative Wearability (NM500/SB50 Injustice)
20min	0.23%	0.21%	1.095
40min	0.47%	0.40%	1.175
60min	0.71%	0.61%	1.164

 

Quality Assurance

 

Surface Inspection System

Adopting on-line image processing and pattern recognition technology, it automatically recognizes the defects on the upper and lower surface of the strip and categorizes the defects to the type they belong to according to the classification defined by the system.

 

Straightness Gauge

Utilizing IRM's products, it is capable of fast edge tracking.

 

High Temperature Scanner

Continuously measures the temperature at various points across the entire cross-section of the strip.

 

Multi-function meter

On-line instantaneous and continuous measurement of centerline, cross-section thickness, temperature, profile, width, edge drop and plate shape at exit of hot rolling.

 

★ Huge investment in research and development. Invested hundreds of millions of dollars to establish a provincial-level technology center and postdoctoral workstation. The annual investment in technology development expenses reaches more than three percent of sales revenue.

 

★In 2003, we began to implement ERP enterprise resource planning management system, which further strengthened the dynamic management of the whole process of quality from raw materials to blanks and then to finished products.

Thin Slab Refining and Rolling Line

It has a series of hardware facilities to ensure clean steel smelting, such as desulfurization, top and bottom double blowing converter (BOF) converter, LF, RH, etc.; it has a thin slab continuous casting and rolling production line with excellent equipment and advanced technology. Product specifications: 0.78~12.7mm×900~1600mm; coil inner diameter 762mm; maximum coil weight 29.6t.

210 tons converter steelmaking line

Our company has a complete set of pure steel smelting equipments, including 3 sets of KR desulfurization machines, 2 sets of top and bottom double blowing converter (BOF) converters, 2 sets of LF, RH and conventional slab continuous casting machines, and so on. The slag detection under the converter, automatic hydrogen and oxygen fixing in refining, dynamic light pressure under the casting machine and electromagnetic stirring equipment and technology belong to the international first-class level.

Product specification: 230mm×900~2200 mm

2250 Hot Rolling Line

A brand new conventional hot rolling line, equipped with roughing and finishing mills with the largest rolling capacity at home and abroad, and the layer cooling section with the most advanced cooling equipment, capable of normal temperature coiling.

Product specifications: 1.2~25.4mm×900~2130mm; coil I.D. 762mm; coil O.D. 1200~2100mm; maximum coil weight 38t.

Cross-cutting and heat treatment line

The 2250 hot rolling line is equipped with the first wide coil cross-cutting and heat treatment line in China, which can provide cross-cutting steel plates with four cutting edges, as well as realize the annealing, quenching, normalizing and tempering heat treatment of cross-cutting steel plates. It also eliminates the internal stress of steel plate through large straightening force and large deformation, which can be used instead of center plate.