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Mine Tungsten Carbide Grade Selection

2016/4/8      view:

Tungsten carbide since the 1970s and applied to the mine since the tool, drilling and blasting engineering steel, nonferrous metals, tunnels, coal, building materials and oil exploration and other areas of the widening range of applications. China's annual consumption of only in mining tools Carbide reached more than 5,000 tons, accounting for carbide production, 1/3. With the growth in demand for carbide quality requirements are growing, while carbide product quality and effect depends largely on the design and composition grades grade selection.

Mine Tungsten Carbide chemical composition and mechanical properties
Mine Tungsten Carbide WC-Co-based ingredients in its performance is mainly composed of Co content and WC grain size to adjust. It requires good toughness, impact resistance of the selection of high Co, coarse WC grain alloy. Requires good wear resistance, the selection of the Co alloy and coarse WC grains. Using modern methods to produce high-density, ultra-fine or nano-alloy, both high wear resistance and high strength.
Of the last century began to study the inhomogeneous structure of the alloy as mining tools. Non-uniform alloy structure in general is to make both high alloy cobalt alloy high toughness and high wear resistance low cobalt alloy. Another case is both high wear resistance alloy alloy coarse grain and fine grain high toughness alloys.

In addition, a small number of mine grades, plus trace amounts of TaC, NbC and other additives.

Mining and drilling tools classification approach

Due to the different nature of the rock (soft with hard, fissures, gravel, dense, hard and soft uneven points) drilling different ways, the partial pressure of different drills, drill bits and a sheet ball gear points, Thus, the various properties of cemented carbide tools for mining a variety of different requirements.

Shock rock tungsten carbide
Shock rock due to impact loads, the requirements of the alloy has good toughness, depending on rock hardness, respectively YG6, YG8, YG8C, YG11C, YG13C, YG15 alloy and other brands. If rock hardness, impact load should large selection of high Co alloy and coarse grains. Instead, a small rock hardness, impact load small, should be used cobalt alloy and coarse WC grains
Drill head suffering from alternating during drilling tensile, compressive, bending, twisting and other cyclic stress (claim alloys withstand millions, even tens of millions of times and impact) stress corrosion. Drill bit poor working conditions, in general, extremely tough and impact energy large rock drilling machine, should focus on toughness, use a higher content of cobalt carbide, the hard, hard, brittle and abrasive large rock, should focus on wear resistance, low cobalt content selected carbide.
Impact energy is small, broken rock than the required power increases. Within a certain range, the impact energy is increased, the required rock crushing work ratio decreases. The more rock solid, in the case of the same impact energy, specific power increases. The impact energy is large, weak or brittle rock rocks ball tooth bit brazing sheet having a head better than adaptability. Impact energy is too large, rock crushing and excessive energy loss caused by root.
According to the nature and impact rock drilling machine can be different, use different amounts of cobalt grades.
Alloy brazing sheet rock surrounding the head stroke length, large area, it is faster than the surrounding metal alloy center wear, easily broken. Brazing alloy sheet and a small head on rock loading area, the boundary lines are short, so the unit area to withstand the impact load is large.
Ball tooth bit teeth and tooth edge reasonable distribution of each tooth may incur drilling area is relatively balanced, uniform wear Yijiao. Alloy ball tooth bit of rock loading area, the boundary line is long, a small area of the unit to withstand impact loads. Therefore, the design alloy ball tooth bit, the binder content may be lower than some of the sheet-like drill bits. WC grains can be finer.

Ball tooth bit for drilling and impact energy of large machines. Pneumatic rock drill impact energy shortage, the use of ball tooth bit flaky drill penetration rate but not as anti-capacity radial wear is not as flaky drill head; due to the impact of hydraulic rock drill can be large, you should use the main ball tooth bit . For serious tough abrasive rock, the ball tooth bit of life is often not as good as the sheet-like drill bits.

Rotary drilling and mining tools tungsten Carbide
Rotary hammer generally refers to coal drilling and geological drilling bits, impact load is small, requiring anti-wear alloy-based, has a certain toughness, it should design and application of low cobalt and the coarse WC grain alloy. As YG6, YG8, YG4C, YG6C, YG8C carbide grades.
Coal cutting tooth, in addition to the requirements of wear, but also can withstand the impact load, usually the design and selection of coarse grains cobalt alloy.

Core drilling, is a rotary drilling for geological drilling, the impact load is small, and often in the design and selection, cobalt alloy and coarse WC grains.

Oil well drilling tungsten carbide

Oil drilling tungsten carbide alloy is very sensitive to the damage at the bottom. So having the desired alloy has a better wear resistance and toughness basis. We should design and selection of high cobalt alloy and coarse grains. As YG8C, YG11C, YG13C like.