Leeb hardness tester standard

- Jan 13, 2019-

Because of its convenient carrying, simple operation, rapid detection and accurate measurement, the Leeb hardness tester has been widely used in the testing of metal hardness. The relevant departments of the country have also issued a series of standards for the Leeb hardness tester. Make a brief introduction separately. I. "Technical Conditions for Leeb Hardness Tester" ZBN 71010-90 This standard is an industry standard. The technical conditions, test (inspection) methods, inspection rules, complete sets and signs, packaging, random documents, etc. of the Leeb hardness tester are specified. Standards: 1. The hardness tester should work normally under the following conditions: • Ambient temperature 0~40°C, relative humidity not more than 90%; • No vibration and no strong magnetic field, no corrosive medium in the surrounding environment. 2. The hardness of the tungsten carbide ball on the punch should not be lower than 1500 HV. 3. Error: • The relative error of the indication does not exceed ±0.8%; • The relative error of the indication repeatability should be no more than 1%. 4. The supplied hardness tester shall include: • impact device; • display device; • φ90×55 is equivalent to a hardness block of 800±50 HL. Second, "Lee Hardness Tester" JJG747-1999 This standard belongs to the national metrological verification procedures. The test principle of the Leeb hardness tester, the technical parameters of the impact device, the technical conditions of the Leeb hardness tester, the test conditions and the hardness conversion control value are summarized in the procedure. The main features of the procedure are: 1. The main technical parameters of the various types of impact devices are given. 2. The technical requirements for the standard Leeb hardness block are specified. 3. The values of Vickers hardness and Leeb hardness on the standard test block are given. 4. The conversion values of Brinell hardness and Leeb hardness on the standard test block are given. Third, "Metallic hardness test method" GB/T17394-1998 This standard is the latest national standard. The standard specifies the test principle, symbol, sample, test equipment, test, test result processing and test of metal Leeb hardness test. report. The main features of the standard are: 1. The main technical specifications of the specimen are specified, including: surface roughness, weight, minimum thickness, minimum surface hardened layer depth and minimum radius of curvature. 2. The test method for the hardness test of the sample is described. 3. The conversion table for the hardness and other hardness of various materials is given. The materials include: carbon steel, cast steel, cast iron, low alloy steel, cast aluminum, copper-zinc alloy, copper-tin alloy, pure copper. 4. "Black metal hardness and strength conversion value" GB/T1172-1999 This standard is a national standard. The standard values for ferrous metal hardness and strength are listed in the standard. The main steel systems are: stainless steel and carbon steel, chrome steel, chrome vanadium steel, chrome-nickel steel, chrome-molybdenum steel, chrome-nickel-molybdenum steel, chrome-manganese silicon steel. Ultra high strength steel. The conversion data of the hardness and strength of the Richter scale attached to the Leeb hardness tester is based on the national standard.