[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-563430-105":3,"detail-sidebar-cat-1-en-105":74,"doc-detail-563430-en":120},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":67,"head_meta":69,"extra_data":71,"updated_unix":73},105,"en","rockwell-c-hardness-conversion-approximate-conversion-numbers-for-non-austenitic-steels","Rockwell C Hardness Conversion - Approximate Conversion Numbers for Non-austenitic Steels","","Rockwell C hardness conversion chart provides approximate equivalences for non-austenitic steels, mapping Rockwell C values to related hardness scales used in materials testing. The table includes relationships involving Rockwell superficial, Brinell, Vickers, Knoop, and strength-related entries, supporting quick cross-checking of hardness readings. Accompanying guidance highlights ASTM E 140 for more accurate comparison and emphasizes calibration importance, noting that hardness testers can drift when calibration is overdue.",{"@graph":14,"@context":66},[15,34,49],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/template/","Template",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/template/paper-templates/","Paper 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measurements for non-austenitic steels.","Answer",{"name":59,"@type":54,"acceptedAnswer":60},"Which hardness scales are included in the chart?",{"text":61,"@type":57},"The chart presents conversions involving Rockwell C and also includes superficial Rockwell, Brinell, Vickers, and Knoop-related entries.",{"name":63,"@type":54,"acceptedAnswer":64},"Why is calibration important when using this chart?",{"text":65,"@type":57},"Because hardness testers can drift if they are more than a year past their last calibration, leading to differences between measured values and the chart’s numbers.","https://schema.org",{"og:url":32,"og:type":68,"og:title":10,"og:site_name":40,"og:description":12},"article",{"robots":70,"canonical":32},"index,follow",{"doc_id":72,"site_id":7},563430,1791834513,{"code":4,"msg":75,"data":76},"success",[77,82,87,92,97,102,107,112,116],{"id":78,"doc_module":22,"doc_module_name":25,"category_name":79,"show_sort_weight":80,"slug":81},11,"Presentations",90,"presentations",{"id":83,"doc_module":22,"doc_module_name":25,"category_name":84,"show_sort_weight":85,"slug":86},12,"Resumes",80,"resumes",{"id":88,"doc_module":22,"doc_module_name":25,"category_name":89,"show_sort_weight":90,"slug":91},14,"Invoices",70,"invoices",{"id":93,"doc_module":22,"doc_module_name":25,"category_name":94,"show_sort_weight":95,"slug":96},15,"Posters",60,"posters",{"id":98,"doc_module":22,"doc_module_name":25,"category_name":99,"show_sort_weight":100,"slug":101},16,"Social 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Testing | Nondestructive Testing | Specimen Machining | Calibration  \n[LabTesting.com](LabTesting.com)[ ](LabTesting.com)800-219-9095 [Sales@LabTesting.com](Sales@LabTesting.com)[ ](Sales@LabTesting.com)2331 Topaz Drive Hatfield, PA 19440  \nRockwell C Hardness Conversion  \nApproximate Conversion Numbers for Non-austenitic Steels  \nTensile  \nRockwell Superficial Rockwell Brinell Vickers Knoop Strength  \n\n| Diamond Penetrator |  |  | Diamond Penetrator |  |  | 10 mm\u003Cbr>Carbide\u003Cbr>Ball | Diamond\u003Cbr>Pyramid | Diamond\u003Cbr>Penetrator | Steel |\n| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |\n| C Scale\u003Cbr>150 kgf | D Scale\u003Cbr>100 kgf | A Scale\u003Cbr>60 kgf | 15N Scale\u003Cbr>15 kgf | 30N Scale\u003Cbr>30 kgf | 45N Scale\u003Cbr>45 kgf | 3000 kgf\u003Cbr>Hardness | 10 kgf | 500 gf &\u003Cbr>over | Equiv.\u003Cbr>1000 lb\u003Cbr>sq in |\n| 68 | 77 | 86 | 93 | 84 | 75 |  | 940 | 920 |  |\n| 67 | 76 | 85 | 93 | 84 | 74 |  | 900 | 895 |  |\n| 66 | 76 | 85 | 93 | 83 | 73 |  | 865 | 870 |  |\n| 65 | 75 | 84 | 92 | 82 | 72 |  | 832 | 846 |  |\n| 64 | 74 | 84 | 92 | 81 | 71 |  | 800 | 822 |  |\n| 63 | 73 | 83 | 91 | 80 | 70 |  | 772 | 799 |  |\n| 62 | 73 | 83 | 91 | 79 | 69 |  | 746 | 776 |  |\n| 61 | 72 | 82 | 91 | 79 | 68 |  | 720 | 754 |  |\n| 60 | 71 | 81 | 90 | 78 | 67 |  | 697 | 732 |  |\n| 59 | 70 | 81 | 90 | 77 | 66 | 634 | 674 | 710 |  |\n| 58 | 69 | 80 | 89 | 76 | 64 | 615 | 653 | 690 |  |\n| 57 | 69 | 80 | 89 | 75 | 63 | 595 | 633 | 670 |  |\n| 56 | 68 | 79 | 88 | 74 | 62 | 577 | 613 | 650 |  |\n| 55 | 67 | 79 | 88 | 73 | 61 | 560 | 595 | 630 |  |\n| 54 | 66 | 78 | 87 | 72 | 60 | 543 | 577 | 612 |  |\n| 53 | 65 | 77 | 87 | 71 | 59 | 525 | 560 | 594 |  |\n| 52 | 65 | 77 | 86 | 70 | 57 | 512 | 544 | 576 |  |\n| 51 | 64 | 76 | 86 | 69 | 56 | 496 | 528 | 558 |  |\n| 50 | 63 | 76 | 86 | 69 | 55 | 481 | 513 | 542 |  |\n| 49 | 62 | 75 | 85 | 68 | 54 | 469 | 498 | 526 |  |\n| 48 | 61 | 75 | 85 | 67 | 53 | 455 | 484 | 510 |  |\n| 47 | 61 | 74 | 84 | 66 | 51 | 443 | 471 | 495 |  |\n| 46 | 60 | 73 | 84 | 65 | 50 | 432 | 458 | 480 |  |\n| 45 | 59 | 73 | 83 | 64 | 49 | 421 | 446 | 466 |  |\n| 44 | 59 | 73 | 83 | 63 | 48 | 409 | 434 | 452 |  |\n| 43 | 58 | 72 | 82 | 62 | 47 | 400 | 423 | 438 |  |\n| 42 | 57 | 72 | 82 | 61 | 46 | 390 | 412 | 426 |  |\n\n(continued on next page)  \nMaterials Testing | Nondestructive Testing | Specimen Machining | Calibration  \n[LabTesting.com](LabTesting.com)[ ](LabTesting.com)800-219-9095 [Sales@LabTesting.com](Sales@LabTesting.com)[ ](Sales@LabTesting.com)2331 Topaz Drive Hatfield, PA 19440  \nRockwell  \nSuperficial Rockwell  \nBrinell  \nVickers  \nKnoop  \nTensile Strength  \n\n| Diamond Penetrator |  |  | Diamond Penetrator |  |  | 10 mm\u003Cbr>Carbide\u003Cbr>Ball | Diamond\u003Cbr>Pyramid | Diamond\u003Cbr>Penetrator | Steel |\n| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |\n| C Scale\u003Cbr>150 kgf | D Scale\u003Cbr>100 kgf | A Scale\u003Cbr>60 kgf | 15N Scale\u003Cbr>15 kgf | 30N Scale\u003Cbr>30 kgf | 45N Scale\u003Cbr>45 kgf | 3000 kgf\u003Cbr>Hardness | 10 kgf | 500 gf &\u003Cbr>over | Equiv.\u003Cbr>1000 lb\u003Cbr>sq in |\n| 41 | 56 | 71 | 81 | 60 | 44 | 381 | 402 | 414 |  |\n| 40 | 55 | 70 | 80 | 60 | 43 | 371 | 392 | 402 |  |\n| 39 | 55 | 70 | 80 | 59 | 42 | 362 | 382 | 391 |  |\n| 38 | 54 | 69 | 79 | 58 | 41 | 353 | 372 | 380 |  |\n| 37 | 53 | 69 | 79 | 57 | 40 | 344 | 363 | 370 |  |\n| 36 | 52 | 68 | 78 | 56 | 38 | 336 | 354 | 360 |  |\n| 35 | 52 | 68 | 78 | 55 | 37 | 327 | 345 | 351 |  |\n| 34 | 51 | 67 | 77 | 54 | 36 | 319 | 336 | 342 |  |\n| 33 | 50 | 67 | 77 | 53 | 38 | 311 | 327 | 334 |  |\n| 32 | 49 | 66 | 76 | 52 | 34 | 301 | 318 | 326 |  |\n| 31 | 48 | 66 | 76 | 51 | 33 | 294 | 310 | 318 |  |\n| 30 | 48 | 65 | 75 | 50 | 31 | 286 | 302 | 311 |  |\n| 29 | 47 | 65 | 75 | 50 | 30 | 279 | 294 | 304 |  |\n| 28 | 46 | 64 | 74 | 49 | 29 | 271 | 286 | 297 |  |\n| 27 | 45 | 64 | 73 | 48 | 28 | 264 | 279 | 290 |  |\n| 26 | 45 | 63 | 73 | 47 | 27 | 258 | 272 | 284 |  |\n| 25 | 44 | 63 | 72 | 46 | 26 | 253 | 266 | 278 |  |\n| 24 | 43 | 62 | 72 | 45 | 24 | 247 | 260 | 272 |  |\n| 23 | 42 | 62 | 71 | 44 | 23 | 243 | 254 | 266 ","cbCaissDDmUU5VbU","https://ap.wps.com/l/cbCaissDDmUU5VbU","pdf",259109,"English","# Rockwell C Hardness Conversion\n## Approximate conversion numbers for non-austenitic steels\n## Cross-scales and strength equivalences\n## Notes on ASTM E 140 and calibration","[{\"question\":\"What does the Rockwell C conversion chart provide?\",\"answer\":\"It provides approximate conversion numbers that relate Rockwell C hardness to other hardness scales and equivalent measurements for non-austenitic steels.\"},{\"question\":\"Which hardness scales are included in the chart?\",\"answer\":\"The chart presents conversions involving Rockwell C and also includes superficial Rockwell, Brinell, Vickers, and Knoop-related entries.\"},{\"question\":\"Why is calibration important when using this chart?\",\"answer\":\"Because hardness testers can drift if they are more than a year past their last calibration, leading to differences between measured values and the chart’s numbers.\"}]","Rockwell C Hardness Conversion - Approximate Conversion Numbers for Non-austenitic Steels | PDF"]