標準號：SAE AMS 6409D-2012
中文標準名稱：標準化和回火的專用航空器質量清潔鋼棒,鑄件和管0.80Cr 1.8Ni 0.25Mo (0.38-0.43C)(SAE 4340)
英文標準名稱：Steel, Bars, Forgings, and Tubing 0.80Cr 1.8Ni 0.25Mo (0.38-0.43C) (SAE 4340) Special Aircraft Quality Cleanliness, Normalized and Tempered
標準類型：V11
發布日期：2012/6/27 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：V11
國際標準分類號：49.025.10
引用標準：ASTM A 255-2010;ASTM A 370-2012;ASTM E 112-2010;ASTM E 350-1995;ASTM E 381-2001;ASTM E 384-2011;SAE AMS-H-6875-1998;SAE AMS 2251;SAE AMS 2253;SAE AMS 2259;SAE AMS 2304-1991;SAE AMS 2370;SAE AMS 2372;SAE AMS 2759/1;SAE AMS 2806;SAE AMS 2808;SAE ARP 1110;SA
適用范圍：This specification covers a low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock. These products have been used typically for parts required to meet stringent magnetic particle inspection criteria, having sections 3.5 inches (89 mm) and under in nominal thickness at time of heat treatment, and 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. These products are not recommended for use in parts heat treated to a hardness greater than 46 HRC (ultimate tensile strength over 220 ksi (1517 MPa)) or where the high transverse properties of remelted steel are required.