The quality requirement of petroleum instrument is quite high. Leeb hardness tester and Vicker hardenss tester couldn't meet the test requirements. Generally speaking, users of this kind of equipments would ask the manufacturer to test the Brinell hardness value one by one, and specifically stipulate 3000kgf test force and 10mm carbide alloy ball indenter, or 750kgf test force with 5mm carbide alloy ball indenter. The traditional Brinell hardness tester is mainly applied in lab because of its large volume, heavy weight, and high requirement of test condition.
At the end of 1990s, more and more petroleum machinery equipment accessories were exported, and there were more and more requirements for Brinell hardness testers. The king portable hydraulic Brinell hardness tester of America is brought into China and be widely used. However, the imported hydraulic Brinell hardness testers are more expensive and the manufacturer would not provide after sale service. Hardness tester is high accuracy testing instrument. There is high requirement of debugging and calibrating after perchasement, and that makes the imported product difficult to meet the requirement of maintaining and repairing for domestic users. Baded on the requirement for portable hardness testers in the domestic market, Shenyang Tianxing company manufactures three kinds of portable hydraulic Brinell hardness testers, they are PHB-3000, PHB-3000a and PHB-750.