GB/T 24521-2018 in English

《GB/T 24521-2018炭素原料和焦炭电阻率测定方法》由TC183（全国钢标准化技术委员会）归口，TC183SC15（全国钢标准化技术委员会炭素材料分会）执行，主管部门为中国钢铁工业协会。

Method for the determination of specific resistance of carbon raw materials and coke

1 Scope

This standard specifies the method for the determination of specific resistance of carbon raw materials and coke.

This standard is applicable to the determination of specific resistance of carbon raw materials such as calcined anthracite, graphite, baked scrap, calcined petroleum coke, graphitized coke and needle coke as well as coke.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.

GB/T 1997 Coke - Sampling and preparation of samples
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values

3 Principle

Put the dry specimen with a certain particle size into the specimen tank, and introduce the current with a certain strength under a certain pressure, then measure the voltage drop at both ends of the specimen, and calculate the specific resistance of the specimen according to Ohm's law.

4 Instruments and apparatus

4.1 Specific resistance measurer for powder

4.1.1 Test device, with the schematic diagram shown in Figure 1.

Foreword i
1 Scope
2 Normative references
3 Principle
4 Instruments and apparatus
5 Sampling and preparation of specimen
6 Test procedures
7 Result calculation
8 Precision
9 Inspection report