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If specimen Ais tested using Rockwell C scale showed a value of HRC 45 while Specimen B when tested using Rockwell A scale showed a value of HRA 71.5. Specimen Bwas a cylindrical specimen with 32 mm diameter considering the corrected hardness reading, which of the following statements is true? HARDENED STEEL AND HARD ALLOYS Tensike Vickers Knoop Brinel Streng th Micro- ficial Rockwelr Superficial CAD G 15-N 30-N 45-N HV HK HB KSI WMN Roundness Correction 150 kg 15 kg 30 kg 45 kg 3000 kg 10 mm bll 634 615 595 577 560 543 150 500 gm 100 kgkg Brale Brale Brale bal 59 80.7 69.9 58 80.1 69.2 57 79.6 68.5 56 79.0 67.7 55 78.5 66.9 78.0 66.1 53 77.4 65.4 52 76.8 64.6 51 76.3 63.8 50 75.9 63.1 49 75.2 62.1 48 74.7 61.4 47 74.1 60.8 46 73.6 60.0 45 73.1 59.2 44 72.5 58.5 43 72.0 57.7 42 71.5 56.9 41 70.9 56.2 40 70.4 55.4 39 60 1000 Ibs/ sq in 1000 kg v16N N N 10 kg and gm Brale Brale Brale 89.8 76.6 65.5 89.3 75.7 64.3 88.9 74.8 63.2 88.3 73.9 62.0 87.9 73.0 60.9 87.4 72.0 86.9 71.2 58.6 86.4 70.2 57.4 85.9 69.4 56.1 85.5 68.5 55.0 85.0 67.6 53.8 66.7 52.5 83.9 65.8 51.4 83.5 64.8 50.3 83.0 64.0 49.0 82.5 63.1 478 82.0 62.2 46.7 81.5 61.3 455 80.9 60.4 44.3 80.4 59.5 43.1 79.9 58.6 41.9 Diameter of Specimen - inches (mm) over 674 653 633 613 595 577 710 690 670 650 630 612 909 904 900 896 891 887 Observed Reading 7/8 3/4 (19) (22) 1 (25) (32) 1-1/4 1-1/2 (38) 1/8 1/4 3/8 1/2 (6.4) (10) (13) 5/8 (16) 313 301 292 NA 90 85 80 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 525 512 496 481 469 455 283 273 264 594 576 558 542 526 510 75 70 65 1.0 1.0 1.5 0.5 1.0 1.0 0.5 0.5 1.0 0.5 0.5 0.5 0.5 5 0.5 0.5 0.5 0.5 0.5 560 544 528 879 874 0.5 0.5 513 498 484 255 246 238 86 60 55 50 1.5 2.0 2.5 1.0 1.5 2.0 1.0 1.0 1.5 0.5 1.0 1.0 0.5 0.5 1.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 471 458 446 434 423 412 495 480 466 452 438 426 443 432 421 409 400 390 381 371 362 856 851 847 842 837 832 0.5 221 215 208 201 194 188 182 177 45 40 35 3.0 3.5 4.0 2.0 2.5 3.0 1.5 2.0 2.0 1.0 1.5 1.5 1.0 1.0 1.5 1.0 1.0 1.0 0.5 1.0 1.0 0.5 0.5 0.5 0.5 0.5 0.5 30 25 5.0 5.5 6.0 3.5 4.0 4.5 2.5 3.0 3.5 2.0 2.5 2.5 1.5 2.0 2.0 1.5 1.5 1.5 1.0 1.0 1.5 1.0 1.0 1.0 0.5 1.0 1.0 402 392 382 414 402 391 69.9 54.6 A. A is harder than B B.B is harder than A C. There is no way to compare hardness values D. Both A and B have the same hardness

If specimen Ais tested using Rockwell C scale showed a value of HRC 45 while Specimen B when tested using Rockwell A scale showed a value of HRA 71.5. Specimen Bwas a cylindrical specimen with 32 mm diameter considering the corrected hardness reading, which of the following statements is true? HARDENED STEEL AND HARD ALLOYS Tensike Vickers Knoop Brinel Streng th Micro- ficial Rockwelr Superficial CAD G 15-N 30-N 45-N HV HK HB KSI WMN Roundness Correction 150 kg 15 kg 30 kg 45 kg 3000 kg 10 mm bll 634 615 595 577 560 543 150 500 gm 100 kgkg Brale Brale Brale bal 59 80.7 69.9 58 80.1 69.2 57 79.6 68.5 56 79.0 67.7 55 78.5 66.9 78.0 66.1 53 77.4 65.4 52 76.8 64.6 51 76.3 63.8 50 75.9 63.1 49 75.2 62.1 48 74.7 61.4 47 74.1 60.8 46 73.6 60.0 45 73.1 59.2 44 72.5 58.5 43 72.0 57.7 42 71.5 56.9 41 70.9 56.2 40 70.4 55.4 39 60 1000 Ibs/ sq in 1000 kg v16N N N 10 kg and gm Brale Brale Brale 89.8 76.6 65.5 89.3 75.7 64.3 88.9 74.8 63.2 88.3 73.9 62.0 87.9 73.0 60.9 87.4 72.0 86.9 71.2 58.6 86.4 70.2 57.4 85.9 69.4 56.1 85.5 68.5 55.0 85.0 67.6 53.8 66.7 52.5 83.9 65.8 51.4 83.5 64.8 50.3 83.0 64.0 49.0 82.5 63.1 478 82.0 62.2 46.7 81.5 61.3 455 80.9 60.4 44.3 80.4 59.5 43.1 79.9 58.6 41.9 Diameter of Specimen - inches (mm) over 674 653 633 613 595 577 710 690 670 650 630 612 909 904 900 896 891 887 Observed Reading 7/8 3/4 (19) (22) 1 (25) (32) 1-1/4 1-1/2 (38) 1/8 1/4 3/8 1/2 (6.4) (10) (13) 5/8 (16) 313 301 292 NA 90 85 80 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 525 512 496 481 469 455 283 273 264 594 576 558 542 526 510 75 70 65 1.0 1.0 1.5 0.5 1.0 1.0 0.5 0.5 1.0 0.5 0.5 0.5 0.5 5 0.5 0.5 0.5 0.5 0.5 560 544 528 879 874 0.5 0.5 513 498 484 255 246 238 86 60 55 50 1.5 2.0 2.5 1.0 1.5 2.0 1.0 1.0 1.5 0.5 1.0 1.0 0.5 0.5 1.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 471 458 446 434 423 412 495 480 466 452 438 426 443 432 421 409 400 390 381 371 362 856 851 847 842 837 832 0.5 221 215 208 201 194 188 182 177 45 40 35 3.0 3.5 4.0 2.0 2.5 3.0 1.5 2.0 2.0 1.0 1.5 1.5 1.0 1.0 1.5 1.0 1.0 1.0 0.5 1.0 1.0 0.5 0.5 0.5 0.5 0.5 0.5 30 25 5.0 5.5 6.0 3.5 4.0 4.5 2.5 3.0 3.5 2.0 2.5 2.5 1.5 2.0 2.0 1.5 1.5 1.5 1.0 1.0 1.5 1.0 1.0 1.0 0.5 1.0 1.0 402 392 382 414 402 391 69.9 54.6 A. A is harder than B B.B is harder than A C. There is no way to compare hardness values D. Both A and B have the same hardness

Welding: Principles and Applications (MindTap Course List)
Welding: Principles and Applications (MindTap Course List)
8th Edition
ISBN:9781305494695
Author:Larry Jeffus
Publisher:Larry Jeffus
Chapter25: Testing And Inspection
Section: Chapter Questions
Problem 39R: What information does a hardness test reveal?
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If specimen A is tested using Rockwell C scale showed a value of HRC 45 while Specimen B when tested using Rockwell A scale showed a value of HRA 71.5. Specimen Bwas a cylindrical specimen with 32 mm diameter considering the corrected hardness reading, which of the following statements is true? HARDENED STEEL AND HARD ALLOYS Tensike Micro- Rockwel Superficial Vickers Knoop Brinel Streng th ficial CADG 15-N 30-N 45-N HV HK HB KSI WMN Roundness Correction 150 kg 3000 kg 10 mm bl 634 615 595 577 560 543 15 kg 30 kg 45 kg N° 500 gm and 150 60 100 1000 Ibs/ sq in 1000 kg kg lv16-NN Brale Brale Brale bal Brale Brale Brale 89.8 76.6 65.5 89.3 75.7 64.3 88.9 74.8 63.2 88.3 73.9 62.O 87.9 73.0 60.9 87.4 72.0 598 86.9 71.2 58.6 86.4 70.2 57.4 85.9 69.4 56.1 85.5 68.5 55.0 85.0 67.6 53.8 84.5 66.7 52.5 83.9 65.8 51.4 83.5 64.8 50.3 83.0 64.0 49.0 82.5 63.1 47.8 82.0 62.2 46.7 81.5 61.3 45.5 80.9 60.4 44.3 80.4 59.5 43..1 79.9 58.6 41.9 kg 10 kg gm Diameter of Specimen - inches (mm) over 59 80.7 69.9 58 80.1 69.2 57 79.6 68.5 56 79.0 67.7 55 78.5 66.9 78.0 66.1 53 77.4 65.4 52 76.8 64.6 51 76.3 63.8 50 75.9 63.1 49 75.2 62.1 48 74.7 61.4 47 74.1 60.8 46 73.6 60.0 45 73.1 59.2 44 72.5 58.5 43 72.0 57.7 42 71.5 56.9 41 70.9 56.2 40 20.4 55.4 39 69.9 54.6 674 653 633 613 595 577 560 544 528 513 498 484 710 690 670 351 338 325 909 904 900 896 891 887 Observed 1/4 3/8 (6.4) (10) 3/4 (19) 7/8 (22) 1-1/4 1-1/2 (32) (38) 1/8 1/2 5/8 (13) (16) Reading (3.2) (25) 313 301 292 650 630 612 594 576 558 NA 90 85 80 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 525 512 496 283 273 264 883 879 874 870 865 861 856 851 847 842 837 832 827 75 70 65 1.0 1.0 1.5 0.5 1.0 1.0 0.5 0.5 1.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 542 526 510 481 469 455 255 246 238 60 55 50 1.5 2.0 2.5 1.0 1.5 2.0 1.0 1.0 1.5 0.5 1.0 1.0 0.5 0.5 1.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 443 432 421 409 400 390 381 371 362 229 221 215 471 458 446 434 423 412 402 392 382 495 480 466 452 438 426 0.5 45 40 35 3.0 3.5 4.0 2.0 2.5 3.0 1.5 2.0 2.0 1.0 1.5 1.5 1.0 1.0 1.5 1.0 1.0 1.0 0.5 1.0 1.0 0.5 0.5 0.5 0.5 0.5 0.5 208 201 194 188 182 177 25 20 5.0 5.5 6.0 3.5 4.0 4.5 2.5 3.0 3.5 2.0 2.5 2.5 1.5 2.0 2.0 1.5 1.5 1.5 1.0 1.0 1.5 1.0 1.0 1.0 0.5 1.0 1.0 414 402 391 817 A. A is harder than B B. B is harder than A OC. There is no way to compare hardness values D. Both A and B have the same hardness
Transcribed Image Text:If specimen A is tested using Rockwell C scale showed a value of HRC 45 while Specimen B when tested using Rockwell A scale showed a value of HRA 71.5. Specimen Bwas a cylindrical specimen with 32 mm diameter considering the corrected hardness reading, which of the following statements is true? HARDENED STEEL AND HARD ALLOYS Tensike Micro- Rockwel Superficial Vickers Knoop Brinel Streng th ficial CADG 15-N 30-N 45-N HV HK HB KSI WMN Roundness Correction 150 kg 3000 kg 10 mm bl 634 615 595 577 560 543 15 kg 30 kg 45 kg N° 500 gm and 150 60 100 1000 Ibs/ sq in 1000 kg kg lv16-NN Brale Brale Brale bal Brale Brale Brale 89.8 76.6 65.5 89.3 75.7 64.3 88.9 74.8 63.2 88.3 73.9 62.O 87.9 73.0 60.9 87.4 72.0 598 86.9 71.2 58.6 86.4 70.2 57.4 85.9 69.4 56.1 85.5 68.5 55.0 85.0 67.6 53.8 84.5 66.7 52.5 83.9 65.8 51.4 83.5 64.8 50.3 83.0 64.0 49.0 82.5 63.1 47.8 82.0 62.2 46.7 81.5 61.3 45.5 80.9 60.4 44.3 80.4 59.5 43..1 79.9 58.6 41.9 kg 10 kg gm Diameter of Specimen - inches (mm) over 59 80.7 69.9 58 80.1 69.2 57 79.6 68.5 56 79.0 67.7 55 78.5 66.9 78.0 66.1 53 77.4 65.4 52 76.8 64.6 51 76.3 63.8 50 75.9 63.1 49 75.2 62.1 48 74.7 61.4 47 74.1 60.8 46 73.6 60.0 45 73.1 59.2 44 72.5 58.5 43 72.0 57.7 42 71.5 56.9 41 70.9 56.2 40 20.4 55.4 39 69.9 54.6 674 653 633 613 595 577 560 544 528 513 498 484 710 690 670 351 338 325 909 904 900 896 891 887 Observed 1/4 3/8 (6.4) (10) 3/4 (19) 7/8 (22) 1-1/4 1-1/2 (32) (38) 1/8 1/2 5/8 (13) (16) Reading (3.2) (25) 313 301 292 650 630 612 594 576 558 NA 90 85 80 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 525 512 496 283 273 264 883 879 874 870 865 861 856 851 847 842 837 832 827 75 70 65 1.0 1.0 1.5 0.5 1.0 1.0 0.5 0.5 1.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 542 526 510 481 469 455 255 246 238 60 55 50 1.5 2.0 2.5 1.0 1.5 2.0 1.0 1.0 1.5 0.5 1.0 1.0 0.5 0.5 1.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 443 432 421 409 400 390 381 371 362 229 221 215 471 458 446 434 423 412 402 392 382 495 480 466 452 438 426 0.5 45 40 35 3.0 3.5 4.0 2.0 2.5 3.0 1.5 2.0 2.0 1.0 1.5 1.5 1.0 1.0 1.5 1.0 1.0 1.0 0.5 1.0 1.0 0.5 0.5 0.5 0.5 0.5 0.5 208 201 194 188 182 177 25 20 5.0 5.5 6.0 3.5 4.0 4.5 2.5 3.0 3.5 2.0 2.5 2.5 1.5 2.0 2.0 1.5 1.5 1.5 1.0 1.0 1.5 1.0 1.0 1.0 0.5 1.0 1.0 414 402 391 817 A. A is harder than B B. B is harder than A OC. There is no way to compare hardness values D. Both A and B have the same hardness
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