China Digital Brinell Hardness Tester MHB-3000

1. Introduction
1.1 Brinell hardness test is mainly used in hardness measurement for cast iron, steel products, nonferrous metals and soft alloys, etc.. Besides it can be also used in hardness measurement for some non-ferrous materials, such as plastics, bakelite, etc.. It is applicable to factory, workshop, laboratory, university and college, and scientific research institution.
1.2 The digital Brinell hardness test is to use a steel ball of a certain diameter to press on the substance surface to be tested with specified test force (Fig.1). Through the specific time of holding test force, remove it and measure the diameter of the indentation of the specimen surface with reading microscope. Take the two points d1and d2 and input them and on the LCD screen appears the Brinell hardness value.
1.3 Brinell hardness value can be obtained from the following calculating formula.
Where F---------------------Test force( unit: N);
D---------------------Diameter of the ball (unit: mm);
d---------------------Diameter of the indentation (unit: mm);
0.102----------------------Special factor.

2. Main Technical Specifications
2.1 Testing Force: 612.9N (62.5kg) 4903N (500kg)
980.7N (100kg) 7355N (750kg)
1226N (125kg) 9807N (1000kg)
1839N (187.5kg) 14710N (1500kg)
2452N (250kg) 29420N (3000kg)

Table 1

2.2 Value -Indicating precision (Table 1)

Standard hardness test blockMax error of the indicated value%Repetition error of the indicated value%≤125±33125<HBW≤225±2.52.5>225±22

2.3 Correspondent Relations among Scale, Indenter and Test Force (Table 2)
Table 2

Hardness SymbolsDiameter of Indenter (mm) F/D2Test Force N (kg) HBW 10/3000103029420(300)HBW 10/1500101514710(1500)HBW 10/100010109807(1000)HBW 10/5001054903(500)HBW 10/250102.52452(250)HBW 10/100101980.7(100)HBW 5/7505307355(750)HBW 5/2505102452(250)HBW 5/125551226(125)HBW 5/62.552.5612.9(62.5)HBW 2.5/187.52.5301839(187.5)HBW 2.5/62.52.510612.9(62.5)

2.4 Specifications of Indenter:Steel Ballφ2.5 mm,φ5 mm,φ10 mm:
2.5 Hardness Measurement Range:8~650 HBW
2.6 Amplification of Reading Microscope:20 times
2.7 Minimum Division Value of Micrometer Drum Wheel:0.00125mm
2.8 Maximum Height of Sample:220mm
2.9 Distance from Indenter's center to instrument Body:135mm
2.10 Voltage of Power Source:AC220V±5%,50~60Hz
2.11 Dimension of Tester (LxWxH):(545x235x755)mm
2.12 Weight of Tester:about 123kg