With the release of the production and sales data of China's auto industry in December, the market share of domestic independent brands has not unexpectedly declined in 2014. Although from the current development of the self-owned brand camp, there are a few independent auto companies that have achieved contrarian growth with the current sales of several products, but as Changhua Automobile’s president Zhu Huarong once said, “In the next five years, As for the self-owned brand to die half, "the independent brand is still facing tremendous pressure to survive." At present, from the perspective of the automobile enterprise group, the development status of China's automobile industry. If the mature automobile market is compared or standard, there are so many complete vehicle companies in China that it is obviously a kind of immature automobile industry or market. status.
Therefore, as China's auto industry and market are gradually maturing, the situation of so many domestic auto companies coexisting will inevitably change. And this change will inevitably mean that those automakers whose production and sales scales are ranked lower will inevitably be merged and acquired or even die out.
How can self-owned brands whose production and sales scales are relatively backward can avoid the fate of being eliminated by the market? Is it entirely based on your own efforts in the field of independent brands? Let's polish our eyes and see how the top ranked car groups do it!
The number one SAIC Group, in addition to its own brand passenger car business and non-passenger segment, has two joint venture brands, Shanghai GM (including Shanghai GM Wuling) and Shanghai Volkswagen, in the passenger vehicle segment. What is the scale of production and sales of SAIC Group?
The second-ranked Dongfeng Group, in addition to its own brand passenger car business and non-passenger segment, has joint venture brands such as Dongfeng Nissan, Dongfeng Shenlong, Dongfeng Honda and Dongfeng Yueda Kia in the passenger vehicle segment. Enterprises occupy a large share of the production and sales of Dongfeng Group?
The third-ranked FAW Group, in addition to its own brand passenger car business and non-passenger segment, has joint ventures such as FAW-Volkswagen, FAW Toyota and FAW Mazda in the passenger vehicle segment, and these joint ventures occupy FAW Group. What is the large scale of production and sales?
In addition to the top three car groups mentioned above, in the fourth to tenth place in Changan, Beiqi, Guangzhou Automobile, Brilliance, Great Wall, Chery and Jianghuai, the joint ventures of Changan, BAIC, GAC and Brilliance It also occupies most of the market share of its group's production and sales scale, and Chery's joint venture business has also achieved product downline. In the future, with the increase in the scale of production and sales of its joint venture business, it will undoubtedly move forward in the ranking of sub-groups. Relying on, while leaning forward, will undoubtedly encourage it to stay away from the fate of elimination. Therefore, in the top 10 auto enterprise groups in 2014, we can see that only the Great Wall and Jianghuai still have no joint ventures to support the total production and sales of the flag, and still rely on their own business support; thus we can also see At present, China's so-called top-ranking auto groups still rely on their joint ventures to support their production and sales scale, support their income and profits, support their own business and the source of technology.
Let's look at the Great Wall and Jianghuai. At present, it can rank in the top ten. In addition to the commercial vehicle sector, it is undoubtedly relying on the strong demand of the SUV market. It is undoubtedly relying on the market competition in which the SUV market is still insufficient. Imagine that when the market is saturated. After the competition is sufficient, will the two car companies, which are only supported by their own businesses, suffer from losses in the areas of production and sales, income and profits of other car companies because they do not have the support of joint ventures in the future?
At the same time, with the adjustment of the “market-for-technology” policy in the future, the auto groups with joint ventures in the existing joint ventures’ profits from their own businesses In addition to the support of development, it is also possible to feed back its own business in the technical field through joint ventures. Once this happens, it may be difficult for the auto companies in the future, such as the Great Wall and Jianghuai, to have their own business and other auto companies’ independent businesses. Competition, and the resulting most pessimistic ending is the elimination of the market.
Although I would like to suggest that Great Wall and Jianghuai should also make joint ventures, they may be embarrassed by people in the industry or the country. But the reality is such a reality. In China, the development of automobile enterprise groups is still based on the scale of production and sales, income and profit. When measuring its strength and weakness, when it has not reached the point where it can compete with the joint venture brand on the same starting line, the choice of joint venture may be the lower-ranking car companies such as Great Wall and Jianghuai. The inevitable choice.
Take Jianghuai as an example. If it is actively seeking cooperation with a certain overseas brand, and now the market size of the world's largest auto production and sales in China's auto market, the current overseas brands are accelerating the localization process in the Chinese auto market, with JAC in It is not difficult to find a partner in the production qualifications and other resources of the passenger vehicle field. And if it can find an overseas brand (whether it is a mainstream brand or a luxury brand) to cooperate and be able to quickly achieve production and production, its position in the Chinese automotive industry will obviously increase rapidly; at the same time, with the country's "market-for-technology" With the adjustment of policies, Jianghuai will also have the opportunity to obtain more technical support from its partners, so as to realize the back-feeding of its own business through the profit and technology of its joint venture business, and promote the accelerated development of its independent business.
As with the above, will the Jianghuai and other car companies face the risk of being eliminated in the future? The answer is obviously no!

Tungsten Carbide Roller

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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