Huayin hardness testerLeeb hardness block, Vickers hardness block, Rockwell hardness block, Brinell hardness block, microhardness block

The standard test block of Leeb hardness tester is a unique standard test block in Leeb hardness tester, with the code HL. The general hardness values are around (490-570) HLD, (590-670) HLD, and (750-830) HLD. It is the standard basis for daily use of Leeb hardness tester and can be used for calibration before measurement or when there is doubt about the hardness tester. The error of Leeb hardness tester is generally ± 30HLD, with a diameter of 90mm.The value is calculated by the ratio of the rebound velocity of the punch at a distance of 1mm from the surface of the specimen to the impact velocity, when a specified quality of impact body is used to impact the surface of the specimen at a certain speed under the action of elastic force.

The calculation formula is as follows:

HL=1000X Vb/Va, where:

HL————Leeb hardness symbol

Va————The impact velocity of the ball head, m/s；

Vb————The rebound speed of the ball head, m/s。

Due to the convenient testing method of the Leeb hardness tester, it can better adapt to large workpieces without sampling.

Dietmar LeebExperimental characteristics：

1Testing of hardness for large equipment and metal structures;

2High inspection efficiency, fast testing, and convenient reading;

3The Leeb hardness test method causes minimal surface damage to the product and can sometimes be considered as non-destructive testing;

4Unique in all directions, narrow spaces, and special areas.

Requirements for Leeb hardness on test specimens:

1Roughness

2Curved surface specimen

3sample weight

4Sample thickness and surface hardening layer thickness

Leeb hardness is better than bad:

1For special purposes or to obtain accurate conversion relationships between Leeb hardness and other hardness values, it is best to use specialized conversion tables with limited conditions.

2Due to the lack of clear physical relationships between hardness testing methods and differences in mechanical properties of processed materials, there are varying degrees of conversion errors in commonly used hardness conversion tables.

3For ordinary steel and cast steel, the conversion relationship between domestic conversion tables and Swiss conversion tables is similar in most hardness ranges, but there are varying degrees of differences in local ranges. Due to the rapid development of Leeb hardness in China, some manufacturers have incorporated the national standard hardness conversion table into Leeb hardness testers

4It is recommended to first use a dedicated conversion table in the standard, and for approximate conversions, the standard table can be used as a reference.