前言 YZL—30是抗拉强度为30公斤/毫米~2的优质铸造铝合金。该合金是我部参照美国Tens—50合金的化学成份和热处理制度研制的Al—Si—Mg—Be—Ti系合金,它具有较高的机械性能、良好的气密性和铸造工艺性能,适用于大型液体火箭发动机推进剂泵壳及其它结构复杂、要求有较高机械性能和气密性的优质铸件。国外相应的铸铅合金如美国的Tens— Preface YZL-30 is a high-quality cast aluminum alloy with a tensile strength of 30 kg / mm ~ 2. The alloy is Al-Si-Mg-Be-Ti alloy developed by our department with reference to the chemical composition and heat treatment system of Tens-50 alloy in the United States. It has high mechanical properties, good air tightness and casting process performance. In large liquid rocket engine propellant pump shell and other complex structures, require high mechanical properties and air tightness of high-quality castings. Corresponding overseas cast lead alloy such as the United States Tens-