该报告列出了近似的硬度转换值；维氏硬度、布氏硬度、洛氏硬度、洛氏表面硬度、肖氏硬度的试验方法；以及有关表面处理、试样厚度、曲面影响的信息，以及表面硬化零件洛氏表面硬度试验的建议。本报告中的表格给出了维氏-布氏硬度、洛氏硬度和硬化硬度值与钢的相应近似抗拉强度之间的近似关系。由于尺寸、质量、成分和热处理方法的不可避免影响，不可能给出精确的关系。 如果需要更精确的转换，则应专门针对每种钢成分、热处理和零件进行转换。随附的钢硬度值换算表基于对碳钢和合金钢的广泛试验，主要是在热处理条件下，但已发现，在锻造、退火、正火、淬火和回火条件下，几乎所有结构合金钢和工具钢都是可靠的，只要它们是均匀的。高锰钢、18%铬钢、8%镍钢和其他奥氏体钢、镍基合金，以及冷加工条件下的结构合金钢和工具钢等特殊情况，可能不符合给定的关系，其精确度与表格所针对的钢材相同。 这些表格中的所有黑体数字均由美国材料与试验学会、美国金属学会和SAE根据仔细检查的数据共同编制。常规面型中给出的值取自1943年SAE手册中发布的陆军-海军近似碳钢和低合金钢的硬度-抗拉强度关系（ANQQ-H-201），仅作了少量调整。

This report lists approximate hardness conversion values; test methods for Vickers Hardness, Brinell Hardness, Rockwell Hardness Rockwell Superficial Hardness, Shore Hardness; and information regarding surface preparation, specimen thickness, effect of curved surfaces, and recommendations for Rockwell surface hardness testing for case hardened parts.The tables in this report give the approximate relationship of Vickers Brinell, Rockwell, and Scleroscope hardness values and corresponding approximate tensile strengths of steels. It is impossible to give exact relationships because of the inevitable influence of size, mass, composition, and method of heat treatment. Where more precise conversions are required, they should be developed specially for each steel composition, heat treatment, and part.The accompanying conversion tables for steel hardness numbers are based on extensive tests on carbon and alloy steels, mostly in the heat treated condition, but have been found to be reliable on practically all constructional alloy steels and tool steels in the as-forged, annealed, normalized, and quenched and tempered conditions, provided they are homogeneous. Such special cases as high manganese steel, 18% chromium— 8% nickel steel and other austenitic steels, and nickel base alloys, as well as constructional alloy steels and tool steels in the cold worked condition, may not conform to the relationships given with the same degree of accuracy as the steels for which the tables are intended.All numbers in these tables given in bold face type were prepared jointly by the American Society for Testing and Materials, the American Society for Metals, and SAE from carefully checked data. The values given in regular face type were taken from the Army-Navy Approximate Hardness Tensile Strength Relationship of Carbon and Low Alloy Steels (ANQQ-H-201) published in the 1943 SAE Handbook, with only minor adjustments.