NB/T 11540-2024Methods for the determination of coal and rock abrasion resistance (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

1 Scope

This document specifies the instruments, equipment, specimens, test and measurement procedures for determining the wear resistance of coal and rock, the wear resistance index of coal and rock and Grading, etc.

This document is applicable to the wear resistance test of coal and rock in the physical and mechanical properties test of coal and rock.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

GB/T 23561.7-2009 Methods for determination of physical and mechanical properties of coal and rock Part 7: Determination of uniaxial compressive strength and softening coefficient Number calculation method

3 Terms and definitions

The following terms and definitions apply to this document.

4 Instruments and Equipment

4.2 Alloy steel needle, the tensile strength of the alloy steel is 2GPa, the Rockwell hardness (HRC) is 54~56, the cone angle is 90°±0.5°, the needle tip is Initial wear amount <=10µm.

4.3 High-power microscope, with a measurement accuracy of not less than 0.0001 mm.

4.5 Vernier caliper. accuracy is 0.02mm.

4.4 Diamond cutting machines and stone cutting machines