hardening tempering heat treatment

Hardening tempering heat treatment usually use induction heating or flame heating way. Import bearing induction heating surface hardening application main technical parameters is surface hardness and local hardness and effective hardening layer depth. Hardness measurement can use vickers hardness tester, also can use los's or surface rockwell hardness plan. Test force (ruler) of the selection and effective hardening layer depth and the surface hardness relevant. Involved in three hardness tester.

Vickers hardness tester is to test the surface heat treatment of hardness of the important means, it can choose 0.5 ~ 100 kg test force, to 0.05 mm thick test thin surface hardening layer, the accuracy of it is the highest, can distinguish the surface hardness of heat treatment tiny difference. In addition, the effective is the depth of hardening layer by vickers hardness tester to measure, so, to surface heat treatment processing or the use of heat treatment of workpiece surface unit, equipped with a vickers hardness tester is necessary.

Surface rockwell hardness plan also is very suitable for testing hardening workpiece hardness, the surface rockwell hardness include three ruler can choose. Can test more than 0.1 mm depth effective sclerosis of all kinds of surface hardening workpiece. Although the surface rockwell hardness the precision of the plan without vickers hardness tester is high, but as a heat treatment plant quality management and qualified measurement method of inspection, have been able to meet the requirements. And it also has simple operation, easy to use, the price is low, measurement quickly, it can directly read hardness value and other characteristics, maintenance centrifugal pump NSK bearings technical standard using the surface rockwell hardness on the surface of the project in heat treatment of quick and nondestructive workpiece by a measure. This point for metal processing machinery manufacturing factory to have the important meaning.

When the surface heat treatment hardening layer is thick, also can use rockwell hardness plan. When heat treatment hardening layer thickness in 0.4 ~ 0.8 mm, can be made HRA rod, when hardening layer thickness more than 0.8 mm, can be made HRC ruler.

Vickers, rockwell surname and surface los's three hardness value can be convenient to mutual conversion, converted into a standard, drawings or the needs of user hardness value. The corresponding conversion tables in the international standard ISO, the United States and China standard ASTM standard GB/T has are given. In shenyang star web site technical data section of the three conversion table can be found.

chemical heat treatment

Chemical heat treatment is to make the surface into one or several chemical element of the atoms, which changes the surface of the chemical component, organization and performance. The low temperature quenching and tempering, Japan NSK bearing of the universal ball surface of workpiece with high hardness, wear resistance and contact fatigue strength, and the core of high toughness and strong.

Chemical heat treatment of the main technical parameters of the workpiece is hardening layer depth and surface hardness. Hardening layer depth still need to use to measure vickers hardness tester. From the surface to the hardness to 50 HRC that distance. This is the effective sclerosis depth

Chemical heat treatment of workpiece surface hardness measurement and hardening workpiece hardness measured similar heat treatment, can use vickers hardness tester, surface rockwell hardness plan or rockwell hardness plan to test, just ooze nitrogen thick thickness is thinner, generally not more than 0.7 mm, then can't again using rockwell hardness plan.

local heat treatment

Parts if the local demand higher hardness, available means such as induction heating local quenching heat treatment, Qingdao rui fine bearing mechanical and electrical introduce the United States BARDEN company bearing added code such parts are usually on the drawing to mark the location of the local quenching heat treatment and local hardness value. Parts of the hardness in designated areas. Hardness test equipment can use rockwell hardness plan, test HRC hardness value, such as heat treatment hardening layer is shallow, can use surface rockwell hardness plan, test  hardness value.
 



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