GB/T 8729-2017Foundry coke (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 8729-1988 "Foundry Coke". Compared with GB/T 8729-1988, the main technical content changes. as follows.

--- Modified normative references (see Chapter 2);

--- Change the special grade to excellent grade (see Chapter 3);

---Modified "Block Size" to "Granularity"; change the size of >80mm, 80mm ~60mm, and >60mm to >120mm, respectively 120mm~80mm, 80mm~60mm (see Chapter 3);

--- Modify the index of crush strength, change the grade from >= 85.0 to >= 87.0; grade 1 from >= 81.0 to >= 83.0; grade 2 from >= 77.0 >= 80.0 (see Chapter 3);

--- Modify the falling intensity index, change the superiority level from >= 92.0 to >= 93.0, the level from >= 88.0 to >= 89.0, and the level from >= 84.0 >= 85.0 (see Chapter 3);

--- Added Appendix A (see Appendix A).

1 Scope

This standard specifies the technical requirements, test methods, inspection rules, transportation and quality certificates for foundry coke.

This standard applies to coke used for cupola smelting.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest version (including all amendments) applies to this document.

GB/T 1997 Coke Sample Preparation and Preparation

GB/T 2001 coke industry analysis and determination method

GB/T 2006 Determination of coke mechanical strength

GB/T 2286 Determination of Total Sulfur Coke Content

GB/T 4511.1 Determination of true relative density, pseudo relative density and porosity of coke

GB/T 4511.2 Determination of Dropping Strength of Coke

GB/T 8170 Representation and Determination of Numerical Rounding Rules and Limit Values

3 Technical requirements

3.1 The technical indicators of foundry coke should meet the requirements of Table 1.

3.2 The intensity indicators M40 and SI504 can be used as options. When the values of these two indicators are inconsistent, the M40 value is used.

3.3 Moisture (%), volatile matter (%), apparent porosity (%), and pulverization rate (%) are not considered as quality acceptance indicators.

3.4 When there is special demand, the supply and demand sides shall negotiate and settle the matter.