本规范涵盖了以SI（公制）单位采购的棒材、锻件、机械管和锻件形式的飞机级低合金钢。AMS 6415是这种MAM的英寸/磅版本。这些产品通常用于热处理时标称厚度为90毫米及以下的零件，这些零件需要在适当硬化和回火时能够产生40HRC的最小硬度的全硬化钢，也用于厚度较大但要求相应较低硬度的零件，但用途不限于此类应用。某些设计和加工程序可能导致这些产品在热处理后容易发生应力腐蚀开裂；ARP 1110建议尽量减少这种情况的做法。

This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock procured in SI (Metric) units. AMS 6415 is the inch/pound version of this MAM. These products have been used typically for parts, 90 millimeters and under in nominal thickness at time of heat treatment, requiring a through-hardening steel capable of developing a minimum hardness of 40 HRC when properly hardened and tempered and also for parts of greater thickness but requiring proportionately lower hardness, but usage is not limited to such applications. Certain design and processing procedures may cause these products to become susceptible to stress-corrosion cracking after heat treatment; ARP 1110 recommends practices to minimize such conditions.