GB/T 18301-2012Refractory products -- Determination of resistance to abrasion at ambient temperature (English PDF)

1 Scope

This Standard specifies the terms and definitions, principles, equipment, specimens, test procedures, result calculations, equipment inspections and test reports, etc. for the resistance to abrasion test of refractories at ambient temperature.

This Standard is applicable to the determination of the resistance to abrasion of dense refractories at ambient temperature under abrasion and erosion environments.

2 Normative References

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this document.

GB/T 2480 Conventional Abrasive - Silicon Carbide

GB/T 2997 Test Method for Bulk Density, Apparent Porosity and True Porosity of

Dense Shaped Refractory Products (GB/T 2997-2000, eqv ISO 5017:1998)

GB/T 8170 Rules of Rounding off for Numerical Values & Expression and

Judgement of Limiting Values

GB/T 9258.1 Coated Abrasives - Grain Size Analysis - Part 1: Grain Size

Distribution Test

GB/T 9258.2 Coated Abrasives - Grain Size Analysis - Part 2: Determination of

Grain Size Distribution of Macro-Grits P12 to P220

ISO 565 Test Sieves – Metal Wire Cloth, Perforated Metal Plate and

Electroformed Sheet – Nominal Sizes of Openings

3 Terms and Definitions

For the purpose of this document, the following terms and definitions apply.

Ensure that there is a gap of 2mm between one end of the sand blasting pipe and the outlet end of the compressed air nozzle; and the abrasion medium enters the sand blasting pipe through this gap. This operation can be done by placing the glass tube on a brass rod with a diameter of 4.5mm, 117mm from the top, and with a 7.9mm lug.

So that it allows the glass tube to be inserted into the steel tube and enter into the gun barrel until the top of the brass rod touches the air nozzle, thereby ensuring a 2mm gap between the glass tube port and the air nozzle.

A new glass tube must be replaced for each measurement.

6 Specimen

7 Test Procedures

7.1 Before the test, dry the specimen to a constant weight at a temperature of (110 ±

5) °C.

7.2 Weigh the specimen, accurate to 0.1g. Measure the length, width, and height of the specimen by a vernier caliper (5.7), and accurate to 0.5mm; then calculate the volume of the specimen.

7.3 Align the test surface of the specimen vertically at the glass nozzle (see NOTE 2) in the test chamber; and place it at a position (203 ± 1) mm away from the end of the nozzle. For shaped refractory specimens, the original flat brick surface without marking shall be used for the test. For unshaped refractory specimens, the test surface shall

Where:

rho – volume density, in g/cm3;

m1 – mass of the specimen before test, in g;

m2 – mass of the specimen after test, in g;

m – loss mass of the specimen, in g.

8.3 The volume density and the amount of abrasion are accurate to 2 digits after the decimal point; and are rounded off according to GB/T 8170.

9 Inspection of the Equipment

Use 10mm~12mm thick colourless transparent float plate glass as the calibration sample; and the data deviation of the two repeated tests does not exceed 7% of the average value. When standard samples are available, use standard samples to check the accuracy of the equipment.

10 Test Report

The test report shall include the following contents:

a) Description of test materials, including manufacturer, model, batch number, etc.;

b) The implemented national standard, namely GB/T 18301-2012;

c) The name of the testing organization;

d) Specimen size;

e) The sample quantity and the number of specimens for each sample;

f) For unshaped specimens, including the conditions of specimen preparation, treatment and baking;

g) If it is different from the content specified in Clause 7, all information on the abrasion surface is required to be indicated;

h) If it is different from the content specified in Clause 7, the impact angle of the specimen placement is required to be indicated;

......