Quality index of graphite electrode


The main indicators of graphite electrode quality and p […]

The main indicators of graphite electrode quality and performance are: bulk density db, electrical resistivity ρ, bending strength, elastic modulus E, thermal expansion coefficient α and ash content A%. According to these indicators of graphite electrodes and the differences between different national standards and manufacturing processes of raw materials, graphite electrodes are divided into three types: ordinary power graphite electrodes, high power graphite electrodes, and ultra-high power graphite electrodes. The post-graphite electrode production plant can add two kinds of high-density graphite electrodes and quasi-ultra-high graphite electrodes according to the functional requirements of different users.

On the basis of national standards, each company,such as Hebei zhouhua Carbon Co., Ltd. has its own corporate standards, and customers will make their own order of quality standards. The relative volume density is the ratio between the quality management of the graphite electrode material sample and its volume. The unit is g/cm3. The larger the volume density, the denser the working electrode, which is positively related to the strength and the performance of the anti-oxidation system. Generally speaking, The greater the influence of the volume density of the same type of electrode, the lower its resistivity.

Resistivity is a parameter for measuring electrode conductivity. It refers to the resistance of the conductor to the current when the current passes through the conductor. The value is equal to the resistance of a conductor with a length of 1m and a cross-sectional area of ​​1m2 at a certain temperature, which reduces consumption during use.



Flexural strength is a parameter that characterizes the performance of the mechanical system of graphite structural materials. It is also called flexural strength. It means that when the external force is perpendicular to the axis of the object, the object will bend to the instantaneous limit caused by the external force to resist the risk. Capacity, the unit is MPa. High-strength electrodes and joints are less likely to break when using the network.

The modulus of elasticity is an important aspect of mechanical properties. It is an index to measure the elastic deformation ability of a material and refers to the stress-strain ratio within the elastic deformation range. The greater the modulus of elasticity, and the greater the stress required for elastic deformation to produce, it simply, the greater the elastic modulus of brittle materials, the smaller the elastic modulus of flexible materials.

The thermal expansion coefficient of graphite as an electrode is a very important thermal performance parameter. The lower the value, the stronger the thermal stability of Chinese products. The higher the oxidation resistance, the performance can reflect the less fracture and consumption in use. The lower.

Ash refers to the components of solid products other than carbon graphite. Graphite is used as the ash content in the electrode and is directly affected by the ash content of the raw materials used. The ash quality of petroleum coke needle coke is low. Therefore, the ash content of graphite through the electrode is generally not more than 0.5%, and the ash content within 1% has no effect on steelmaking. Obviously affect, but the impurity elements in the ash will reduce the performance of the anti-oxidation system of the working electrode, etc.