China's domestic oil prices will greet "two consecutive rises" before the National Day.
The reporter learned from a number of social monitoring agencies that the international crude oil market as a whole has shown a turbulent upward trend. On September 29th, the domestic retail price of refined oil products will usher in “two consecutive risesâ€, which may be around 130 yuan/ton.
Since the rise of domestic refined oil prices on September 15, the news in the international crude oil market has been mixed. Recently, as Iranian officials claimed that if the United States withdraws from the nuclear agreement, the country’s remarks that it can resume nuclear activities immediately when necessary, the market's risk aversion has been detonated, driving the sharp jump in oil prices. The review by the Joint Technical Committee (JTC) showed that during the eight-month period the oil-producing countries’ compliance with the production reduction agreements rose to the highest level of 116% during the year, and data released by Baker Hughes showed that the number of active drilling in the United States continued to decrease. For the crude oil market has brought more positive support. However, the US shale oil will continue to increase production, increase fuel efficiency and increase the number of electric vehicles, which will affect the demand for US gasoline. These negative factors will affect the market. Under the multi-party news game, the recent crude oil futures market fluctuates slightly, but overall it will rise.
As of September 23, Beijing time, crude oil futures for November delivery rose 0.11 US dollars, or 0.22%, to 50.66 US dollars/barrel, reaching a closing high of four months, up 0.4% last week; Brent 11 The monthly delivery of crude oil futures also closed up 0.43 US dollars, or 0.76%, to 56.86 US dollars / barrel, this week, an increase of about 2.2%, rising for four consecutive weeks.
Below this, the rate of change in crude oil extends in the positive range. According to Jinlian, as of September 25, the average price of reference crude oil is US$53.83 per barrel, with a change rate of 3.62%. The corresponding round of gasoline and diesel will increase by RMB 135/ton. The measured rate of change of crude oil was 3.98%. It is expected that the corresponding price of gasoline and diesel will be increased by 137 yuan/ton.
“Since the beginning of the pricing cycle, the overall international crude oil futures market has been oscillatingly rising. At present, the rate of change in crude oil is still at a positive high, and the market’s bullish atmosphere is becoming stronger. This round of domestic oil price increases is more likely to occur, or achieve 'two consecutive up'. "Zhang Zhuoxin, analyst at Zhuo Chuang Information Oil Products, believes.
Jin Lianchuang analyst Han Cong also judged that the market outlook, the international crude oil will remain high range fluctuate, the current round of retail prices (September 29) raised no suspense. Thanks to the boost of stocking demand before the holiday, domestic sales pressure was not strong this month. Therefore, it is expected that the domestic refined oil market will continue to operate at a high level this week, and some units that have completed sales tasks in advance may continue to push up.
Jin Lianchuang analyst Li Yang believes that the fourth quarter, with the end of the summer peak demand season, the international crude oil prices or pressure shocks down, but the latter is expected to continue to extend the production of oil-producing countries and winter heating oil and other needs boosted by the international Crude oil may resume its upward trend. From the news, there is little difference between the fourth quarter and the third quarter. As for the domestic refined oil market, with the end of the “golden nine silver and ten†peak demand season, the refined oil market consumption will gradually fade, and it will be difficult for the refined oil market in the later period to have obvious support.
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:
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.
Tungsten carbide roller material design
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.
Tungsten carbide roller category
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 roller production process control
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.
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