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3. GB/T 17394.3-2012 Leeb Hardness Test for Metallic Materials Part 4: Calibration of

Standard Hardness Blocks

4. GB/T 17394. 4-2014 Leeb Hardness Test for Metallic Materials Part 4: Standard

Value Conversion Table

5. Design basis and standard: Technical Conditions for Leeb Hardness Tester JB/T

9378-2001

4.5

Preparation before use

Preparation of sample surface

When preparing the sample surface, the influence of heating and cold working on the

sample surface hardness shall be avoided as far as possible.

If the measured surface is too rough, measurement error will be caused. Therefore, the

tested surface must show metallic luster and be flat, smooth and free of oil stain.

Curved surface: The test surface is better to be flat. When the curvature radius R of the

tested surface is less than 30mm (type D, DC, D+15, C, E, DL impact devices) and less

than 50mm (type G impact devices), small support rings or profiled support rings should

be used for testing.

Figure 4 Curved sample face

Support of sample

1. No support is required for heavy samples;

2. For medium-sized samples, they must be placed on a flat and firm plane. The

samples should be placed stably without any shaking;

3. The sample shall have sufficient thickness, and the minimum thickness of the sample

shall comply with Table 3;

4. For the samples with surface hardening layer, the depth of hardening layer shall

comply with Table 3.

Coupling

1. For the light sample, it must be tightly coupled with the solid support, the two

coupling surfaces must be flat and smooth, the amount of coupling agent must not be

too much, and the test direction must be perpendicular to the coupling plane;

2. When the sample is a large area plate, long rod or bending piece, if the weight and

thickness are too large, it may cause distortion and instability of the sample, leading to

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