1, the error caused by data conversion
The error in the conversion of Leeb hardness to other hardness includes two aspects: on the one hand, the measurement error of the Leeb hardness itself, which involves the dispersion when tested by the method and the measurement error for multiple Leeb hardness testers of the same model. On the other hand, it is to compare the hardness errors measured by different hardness test methods. This is due to the fact that there is no clear physical relationship between one of the various hardness test methods, and it is due to the unreliable measurement in comparison.
2, the error caused by special materials
The conversion table stored in the hardness tester may deviate from the following steel grades:
All austenitic steels
Heat-resistant tool steels and hardenable materials such as lanthanum chromium steels (tool steels) cause an increase in the elastic modulus, resulting in a lower L value. This type of steel should be tested in cross-section.
Local cooling hardening causes high L value
Due to the influence of the magnetic field, magnetic steel will make the L value low.
Surface-hardened steels with a soft matrix will have a low L-value. When the hardened layer is greater than 0.8 mm (0.2 mm for a C-type impact device), it does not affect the L-value.
3, the error in the gear detection
Under normal circumstances, due to the small tooth surface, the test error is relatively large, for which the user can design the corresponding tooling according to the situation, which will help reduce the error.
4, the impact of material elasticity, plasticity
In addition to hardness and strength, the Richter scale is related to the elastic modulus. The hardness value is a characteristic parameter of the material hardness and plasticity, because the two components must be jointly determined.
In the elastic part, the first is obviously influenced by the E modulus. In this respect, when the static hardness of the material is the same, and the E value is different, the material with a low E value has a larger L value.
5, the error caused by hot rolling direction
When the measured workpiece is formed by the hot rolling process, if the test direction is consistent with the rolling direction, the test value will be low due to the large elastic modulus E, so the test direction should be perpendicular to the hot rolling direction. For example: When measuring the hardness of a cylindrical section, it should be tested in radial direction. (General cylindrical hot rolling direction is axial).
6, the impact of sample weight, roughness, thickness
7. Specimen magnetic should be less than 300 Gauss
8. Influence of other factors When measuring the hardness of pipe fittings, care must be taken to ensure that the pipe fittings are stably supported, the test point should be close to the support point and parallel to the support force, and the pipe wall is thinner to put an appropriate core in the pipe.
The RIMA UND series of AGM deep cycle batteries provide enhanced performance and excellent reliability in long duration cycling
applications. The high density active materials plates and specialized paste formulation of the UND series provides a longer service cycle life without shortening the life of the battery, the battery is based on AGM Battery technology.
General Future:
5-12 years design life(25℃)
Non-spillable construction
Sealed and maintenance-free
Excellent recovery from deep discharge
High density active materials plates
Longer Life and low self-discharge design
Standards:
Compliance with IEC, BS, JIS and EU standards.
UL, CE Certified
ISO45001,ISO 9001 and ISO 14001 certified production facilities
Application:
Solar and wind power system
Communication systems
Uninterruptible power supplies
Golf cars and buggies
Alarm and security system
Electric toy and wheelchairs, etc.
Agm Deep Cycle Batteries,12V Deep Cycle Batteries,Deep Cycle Batteries Agm,Deep Cycle Batteries 6V
OREMA POWER CO., LTD. , https://www.oremabattery.com