1、GM DAEWOO Auto & Technology EDS Engineering, GM DAEWOO Auto & Technology Standards METHOD OF ROCKWELL HARDNESS TEST EDS-T-7117 ISSUED DATE: 1981. 12. 09 REVISED DATE: 2006. 06. 19 VERSION: 3 EDS-T-7117METHOD OF ROCKWELL HARDNESS TEST PAGE: 1/11 ISSUED DATE: 1981. 12. 09 REVISED DATE: 2006. 06. 19 VE
2、RSION: 3 GM DAEWOO Auto & Technology 1. PURPOSE This standard aims at standardizing works by unifying a using method of Rockwell hardness tester used by GMDAT. 2. SCOPE This standard specifies the method of Rockwell A, B, C and Rockwell superficial N and T hardness test for metallic materials mainly
3、 used by GMDAT. 3. DEFINITIONS 3.1. Rockwell and Rockwell superficial hardness When the diamond or ball indenter is preliminary pressed under the standard load, additionally applied the test load and then applied the standard load again, the hardness shall be determined by the difference between the
4、 depth of indentations under those two standard loads mentioned above and also by using the defining formula. When the standard weight is 10kgf (98.07N), it is nominated Rockwell hardness and when 3kgf (29.42N), it is Rockwell superficial hardness. 3.2. Scale of hardness and its content Scale Indent
5、er Standard loadkgf/(N) Test load kgf/(N) Defining formula for hardness Applicable hardnessA 60 (588.4) 4095 C Diamond with a radius of curvature at the tip 0.2mm and a conical angle 120 150 (1471.0) HR=100-e070 Rockwell hardness B Steel or tungsten carbide alloy ball with a diameter 1.5875mm(1/16in
6、) 10 (98.07) 100 (980.7) HR=130-e 0100 15N 30N 45N Diamond with a radius of curvature at the tip 0.2mm and a conical angle 120 15 (147.1) 30 (294.2) 45 (441.3) 2095 Rockwell superficial hardness 15T 30T 45T Steel or tungsten carbide alloy ball with a diameter 1.5875mm(1/16in) 3 (29.42) 15 (147.1) 30
7、 (294.2) 45 (441.3) HR=100-e090 e is the difference between the depth of indentations, expressed in W . Refer to Test Principle 4. EDS-T-7117METHOD OF ROCKWELL HARDNESS TEST PAGE: 2/11 ISSUED DATE: 1981. 12. 09 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology 4. TEST PRINCIPLE 4.1.
8、Rockwell hardness A, C scale No. Designation Content 1 - Conical angle of diamond indenter = 120 2 - Radius of curvature at the tip of diamond indenter = 0.200mm 3 F0Standard load 4 F1Test load 5 F Total load 6 t0Depth of indentation under the standard load 7 t1Increased depth of indentation by the
9、test load 8 tbDepth of permanent deformation by an indenter after removing the test load 9 e Depth of permanent deformation, expressed in units of 0.002mm 10 HRA HRC Rockwell hardness = 100 - e EDS-T-7117METHOD OF ROCKWELL HARDNESS TEST PAGE: 3/11 ISSUED DATE: 1981. 12. 09 REVISED DATE: 2006. 06. 19
10、 VERSION: 3 GM DAEWOO Auto & Technology 4.2. Rockwell hardness B scale No. Designation Content 1 D Diameter of ball indenter = 1.5875mm(1/16 inch) 3 F0Standard load 4 F1Test load 5 F Total load 6 t0Depth of indentation under the standard load 7 t1Increased depth of indentation by the test load 8 tbD
11、epth of permanent deformation by an indenter after removing the test load 9 e Depth of permanent deformation, expressed in units of 0.002mm 10 HRB Rockwell hardness = 130 - e EDS-T-7117METHOD OF ROCKWELL HARDNESS TEST PAGE: 4/11 ISSUED DATE: 1981. 12. 09 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEW
12、OO Auto & Technology 4.3. Rockwell superficial hardness N scale No. Designation Content 1 - Conical angle of diamond indenter = 120 2 - Radius of curvature at the tip of diamond indenter = 0.200mm 3 F0Standard load 4 F1Test load 5 F Total load 6 t0Depth of indentation under the standard load 7 t1Inc
13、reased depth of indentation by the test load 8 tbDepth of permanent deformation by an indenter after removing the test load 9 e Depth of permanent deformation, expressed in units of 0.001mm 10 HR15N HR30N HR45N Rockwell hardness = 100 - e EDS-T-7117METHOD OF ROCKWELL HARDNESS TEST PAGE: 5/11 ISSUED
14、DATE: 1981. 12. 09 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology 4.4. Rockwell superficial hardness T scale No. Designation Content 1 D Diameter of ball indenter = 1.5875mm(1/16 inch) 3 F0Standard load 4 F1Test load 5 F Total load 6 t0Depth of indentation under the standard load
15、7 t1Increased depth of indentation by the test load 8 tbDepth of permanent deformation by an indenter after removing the test load 9 e Depth of permanent deformation, expressed in units of 0.001mm 10 HR15T HR30T HR45T Rockwell hardness = 100 - e EDS-T-7117METHOD OF ROCKWELL HARDNESS TEST PAGE: 6/11
16、ISSUED DATE: 1981. 12. 09 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology 4.5. Tolerance on load and indenter dimensions Division Tolerance Load 10 0.20Kg 60 0.45Kg 100 0.65Kg 150 0.900Kg 3 0.060Kg 15 0.100Kg 30 0.200Kg 45 0.300Kg Indenter 1.588 0.0025mm 3.175 0.0025mm 6.350 0.0025
17、mm 12.700 0.0025mm 5. TEST PIECE 5.1. For initial sample approval purposes, at least 3 test pieces shall be tested and for routine quality control, at least 1 test piece shall be tested. 5.2. As a rule, the test surface of the test piece and its reverse side surface shall be even and parallel to eac
18、h other. When the test piece is made of sheet with bow and its reverse side is not flat, spot anvil shall be applied to test. 5.3. In case the hardness is measured on the curved test surface, the compensated value shall be added to the measured hardness value to be the hardness value of the test pie
19、ce. 5.4. The test piece shall sufficiently be thick (10 times the difference of depth made by pressing of indenter in general) so that, as a rule, no deformation shall be visible at the reverse side of the test piece due to the occurrence of indentation. 5.5. The test surface and its reverse side su
20、rface shall be smooth and clean, and shall be free from pollution of lubricant. 6. TESTER 6.1. The tester to be applied to Rockwell or Rockwell superficial hardness test shall conform to KS B 5526 (Rockwell Hardness Tester). 6.2. When the main parts are disassembled, rebuilt, reset or the indenters
21、are replaced, the tester shall be reconfirmed to accuracy according to KS B 5526 (Rockwell Hardness Tester). EDS-T-7117METHOD OF ROCKWELL HARDNESS TEST PAGE: 7/11 ISSUED DATE: 1981. 12. 09 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology 6.3. Even when being not relevant to the prec
22、eding clause 4.2., the tester shall be confirmed to an accuracy specified in KS B 5526(Rockwell Hardness Tester) with a definite interval depending on the frequency of testing. 6.4. The tester shall be settled on a stand having sufficient stability and shall be worked by placing the mounting axis of
23、 indenter in perpendicular thereto. 7. TEST 7.1. The hardness test shall be performed at a room temperature of 235. 7.2. When the indenter, sample stage and etc. are assembled or replaced, or when the elevating screw for sample stage is moved to align with a large stroke, and when the work is about
24、to be carried out, twice or more preliminary operation which is the same as the measuring procedure of hardness shall be conducted, and then the hardness test shall be carried out. 7.3. When measuring the hardness, as a rule, the distance from the center of any indentation to an edge of the test pie
25、ce shall be at least 2.5 d (d is the diameter of the indentation) and when tests are performed 2 times or more, the distance between the centers of two adjacent indentations shall be at least 4 d in principle. 7.4. The test piece shall be placed so as to the mounting axis of indenter being perpendic
26、ular to the test surface. 7.5. Throughout the loading operation, the test load shall be applied to increase or decrease smoothly to protect the indenter and test piece from shock or vibration. 7.6. The duration time of loading shall generally be 2 6 seconds. 8. DESIGNATION OF HARDNESS 8.1. Unless ot
27、herwise specified, the hardness value shall be recorded up to first decimal place below point in accordance with KS A0021(The end of a number). 8.2. The Rockwell and Rockwell superficial hardness shall be designated in the order of the symbol of hardness, the symbol of scale and hardness value. Exam
28、ple of Designation of Hardness Scale Hardness Designation A B C 15N 30T 30.0 31.0 32.5 33.0 62.0 HRA 30.0 HRB 45.0 HRC 60.5 HR15N 80.0 HR30T 62.0 EDS-T-7117METHOD OF ROCKWELL HARDNESS TEST PAGE: 8/11 ISSUED DATE: 1981. 12. 09 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology 9. REFER
29、ENCE KS B 0806 Method of Rockwell and Rockwell superficial hardness test JIS Z 2245 Method of Rockwell and Rockwell superficial hardness test ASTM E 18 Rockwell hardness & Rockwell superficial hardness of metallic materials DIN 50103 Rockwell hardness test. OPEL 103 Hardness testing according to Roc
30、kwell method C, A, B EDS-T-7117METHOD OF ROCKWELL HARDNESS TEST PAGE: 9/11 ISSUED DATE: 1981. 12. 09 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology Appendix 1. Compensated Value for Cylindrical Test Piece 1. A, C Scale Diameter of Cylindrical test piece (mm) Hardness 6 10 13 16 19
31、 22 25 32 38 20 2.5 2.0 1.5 1.5 1.0 1.0 25 3.0 2.5 2.0 1.5 1.0 1.0 1.0 30 2.5 2.0 1.5 1.5 1.0 1.0 0.5 35 3.0 2.0 1.5 1.5 1.0 1.0 0.5 .5 40 2.5 2.0 1.5 1.0 1.0 1.0 0.5 0.5 45 3.0 2.0 1.5 1.0 1.0 1.0 0.5 0.5 0.5 50 2.5 2.0 1.5 1.0 1.0 0.5 0.5 0.5 0.5 55 2.0 1.5 1.0 1.0 0.5 0.5 0.5 0.5 0 60 1.5 1.0 1.0
32、 0.5 0.5 0.5 0.5 0 0 65 1.5 1.0 1.0 0.5 0.5 0.5 0.5 0 0 70 1.0 1.0 0.5 0.5 0.5 0.5 0.5 0 0 75 1.0 0.5 0.5 0.5 0.5 0.5 0 0 0 80 0.5 0.5 0.5 0.5 0.5 0 0 0 0 85 0.5 0.5 0.5 0 0 0 0 0 0 90 0.5 0 0 0 0 0 0 0 0 2. B Scale Diameter of Cylindrical test piece (mm) Hardness 6 10 13 16 19 22 25 0 4.5 3.5 3.0 1
33、0 5.0 4.0 3.5 3.0 20 4.5 4.0 3.5 3.0 30 5.0 4.5 3.5 3.0 2.5 40 4.5 4.0 3.0 2.5 2.5 50 4.0 3.5 3.0 2.5 2.0 60 5.0 3.5 3.0 2.5 2.0 2.0 70 4.0 3.0 2.5 2.0 2.0 1.5 80 5.0 3.5 2.5 2.0 1.5 1.5 1.5 90 4.0 3.0 2.0 1.5 1.5 1.5 1.0 100 3.5 2.5 1.5 1.5 1.0 1.0 0.5 EDS-T-7117METHOD OF ROCKWELL HARDNESS TEST PAG
34、E: 10/11 ISSUED DATE: 1981. 12. 09 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology 3. N Scale Diameter of Cylindrical test piece (mm) Hardness 3.2 6.4 10.0 13.0 19.0 25.0 20 (6.0) 3.0 2.0 1.5 1.5 1.5 25 (5.5) 3.0 2.0 1.5 1.5 1.0 30 (5.5) 3.0 2.0 1.5 1.0 1.0 35 (5.0) 2.5 2.0 1.5 1.0
35、 1.0 40 (4.5) 2.5 1.5 1.5 1.0 1.0 45 (4.0) 2.0 1.5 1.0 1.0 1.0 50 (3.5) 2.0 1.5 1.0 1.0 0.5 55 (3.5) 2.0 1.5 1.0 0.5 0.5 60 3.0 1.5 1.0 1.0 0.5 0.5 65 2.5 1.5 1.0 0.5 0.5 0.5 70 2.0 1.0 1.0 0.5 0.5 0.5 75 1.5 1.0 0.5 0.5 0.5 0 80 1.0 0.5 0.5 0.5 0 0 85 0.5 0.5 0.5 0.5 0 0 90 0 0 0 0 0 0 4. T Scale D
36、iameter of Cylindrical test piece (mm) Hardness 3.2 6.4 10.0 13.0 16.0 19.0 25.0 20 (13.0) (9.0) (6.0) (4.5) (3.5) 3.0 2.0 30 (11.5) (7.5) (5.0) (4.0) (3.5) 2.5 2.0 40 (10.0) (6.5) (4.5) (3.5) 3.0 2.5 2.0 50 (8.5) (5.5) (4.0) 3.0 2.5 2.0 1.5 60 (6.5) (4.5) 3.0 2.5 2.0 1.5 1.5 70 (5.0) (3.5) 2.5 2.0
37、1.5 1.0 1.0 80 3.0 2.0 1.5 1.5 1.0 1.0 0.5 90 1.5 1.0 1.0 0.5 0.5 0.5 0.5 EDS-T-7117METHOD OF ROCKWELL HARDNESS TEST PAGE: 11/11 ISSUED DATE: 1981. 12. 09 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology Appendix 2. Minimum Thickness of the Test Piece Depending on Hardness Value 1. A, B, C scale 2. N, T scale
