标准摘要
This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.
英文名称Steel Bars, Forgings, Mechanical Tubing, and Forging Stock Aircraft-Quality 0.65Cr - 0.70Ni - 0.25Mo (0.38 - 0.43C) (8740 Modified)