Tungsten carbide roller has characteristics of good wear resistance, high temperature red hardness, thermal fatigue resistance and thermal conductivity and high strength , have been widely used in high-speed wire rod, bar, rebar, seamless steel tubes, etc. Domestic production of tungsten carbide roller materials mostly WC- Co, WC- Co- Ni- Cr two series, and the content of Co, Co- Ni - Cr is in the range of 6wt% ~ 30wt%. From the use of perspective, tungsten carbide rollers has good mechanical properties, its flexural strength up to 2200 MPa or more, shock toughness up (4 ~ 6) × 10^6 J/ m^2, Rockwell hardness (HRA) is up to 78 to 90, widely in the high-speed wire rod rolling process, which is much higher than single-slot chilled cast steel or high speed steel rolls.Tungsten carbide is made of Tungsten Carbide Powder and binder phase (such as drilling, nickel, etc.), and then pressing and sintering, regardless of the conditions under cold rolled or hot rolled has excellent wear resistance, tungsten carbide rollers has been widely used in pre-finishing mill and finishing of high-speed wire rod currently. On the performance of tungsten carbide roller in hot-rolling wire rod , the material must meet the following requirements:
Tungsten carbide roller material design
Tungsten carbide roller category
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First, the PE market
The market price of PE continued to weaken, but the margin was limited, mostly falling steadily, but some industries remained bearish on the outlook. The market still had downside, and its mentality was poor. Downstream buyers have low enthusiasm for receiving goods, and there are few transactions in the market.
LLDPE listing conditions, some brands have made adjustments, the range of 20-100 yuan / ton. Some HDPE grades offer adjustments, ranging from RMB 50-300/ton.
Linfen PE market maintained its decline, falling by 50-100 yuan/ton. The weak shock of LLDPE futures can hardly stimulate buyers' buying enthusiasm, and the atmosphere of market transactions is light.
It is expected that the short-term PE market may continue to decline.
Second, the PP market
PP market mainstream weakness consolidation. Oil prices rebounded weakly overnight and the market sentiment stabilized. At the same time, due to the weak rebound in raw material propylene prices, the PP market slowed down. Due to the negative pressure from downstream demand, business panic was aggravated, and merchants continued to take advantage of the release of goods, but the downstream buying interest was still light and the overall market turnover was low.
PP listing situation, some brands offer adjustments, the range of 20-300 yuan / ton. The manufacturers are mainly Shanghai Petrochemical and Yangzi Petrochemical. The trading varieties are mainly T30S and M1600E, and the warehouses are mostly in Yuyao.
The PP market in Beijing is dominated by weak consolidation. The price of each product tends to soften at around RMB 50/ton, but the overall turnover is sluggish. The firm can talk about it. The drawing mainstream is about RMB 10,500 to RMB 10,600/ton, and the copolymerization is at RMB 10,900 to 11,200/ton. up and down.
It is expected that the short-term PP market may narrow its consolidation.
Third, PVC market
The overall PVC spot market is dominated by stability. The market is still being suppressed by the previous low-end futures sources. The transaction is difficult to pick up, and some low-level sources are still reported. However, most businesses are under greater cost pressure, and their adjustment intentions are not high, and most of them are stable shipments.
It is expected that the short-term PVC market may continue to stabilize.
Fourth, ABS market
The ABS market mostly focuses on stable consolidation. At present, the atmosphere of the ABS market is light. In the face of the current market situation, most of the downstream manufacturers maintain a wait-and-see attitude, and only heard small and small orders.
It is expected that the market outlook for the ABS market will remain stable in the short term, and the possibility of a fall may not be ruled out.
V. PS Market
The mainstream quotes in the PS market have stabilized and some market prices have slightly weakened. PS factory price basically stabilized, affected by the downturn of the styrene market, PS market turnover is poor, some businesses pessimistic attitude, adequate supply of the market, the performance of downstream demand sluggish.
It is expected that the short-term PS market may stabilize.
1. Sufficient anti-fracture strength;
2. Good abrasion resistance;
3. The smooth surface finish;
4. Excellent corrosion resistance, thermal fatigue, thermal cracking performance.
Tungsten carbide roller rings can working in bad conditions , small profile rolling (especially rebar rolling) process conditions is harsher than the high-speed wire rod, and therefore corresponds to the profile rolling ,tungsten carbide rollers recommend using high binder phase carbide.
Pre-finishing all vehicles roller should ensure its high toughness, strength, rigidity and thermal conductivity, followed before considering its wear resistance. When designing each vehicles roller, pre-finishing materials should choose carbide grades of Co, Co- Ni- Cr binder content is high (greater than or equal to 25wt%) , requiring an average WC grain size of coarse (5μm ~ 6μm), to obtain a higher shock toughness, proper strength and hardness. For the finishing of the roller movements, particularly the last two rollers of the finish rolling, which suffered load is small, and high relative velocity of the material to be pressed (80 m / min ~ 120 m / min). In this case, the wear resistance of the roller to be the most important requirements, and must ensure the strength , timpact toughness and hardness of a reasonable match, so the binder of Co / Ni content ratio and the average grain WC control of particle size and other factors must have greater control in front of different pre-finishing rolling roll.
According to the structure of tungsten carbide rollers, it can be divided into solid tungsten carbide roller and composite tungsten carbide roller. Solid tungsten carbide rollers have been widely used in pre-finishing and finishing stands high speed wire rod mill (including fixed reducing the rack, pinch roller rack). Composite tungsten carbide roller is made of cemented carbide and other materials, and it can be divided into tungsten carbide composite roll rings and solid tungsten carbide composite roller. Tungsten carbide composite roll rings mounted on the roller shaft; solid tungsten carbide composite roller will be directly cast in the roll axis to form a whole, a large load is applied to the rolling mill.
Tungsten carbide rollers produced by powder metallurgy method, the key to its process control is the chemical composition of the material and the mixture was prepared, pressed molding, sintering and deep processing and other preparation process parameters.
1. Preparation of starting material (WC focus quality): As the WC raw material and quality control of the use of different levels of quality may fluctuate, resulting in adverse effects on microstructure.
2. Preparation of the mixture: Mixture preparation is the key to the production process of the roller, the roller of failure modes - trachoma, mainly generated by this procedure.
3. Pressing: roller pressing is an important process of the roller mill.
4. Sintering: roller sintering is to determine the final quality of the roller production processes, use of advanced low-pressure sintering technology, HIP sintering technology can greatly improve the performance of roller.
5. Deep processing: deep processing rollers have a greater impact on the quality and accuracy of the roller surface.
On the 3rd, the spot market for plastics was basically stable and small, and some markets were weak. The report on good car and home sales shows that the U.S. economy is recovering steadily and international oil prices have risen slightly. The market's mentality has been supported, but it has not improved. Businesses still hold a bearish view on the market outlook, and downstream demand continues to be poor. The factory's buying interest is still light and the overall turnover is low.