由于难以为评估不同强度和厚度的钢的转变温度曲线建立适当的标准，因此开展了一项研究，以调查各种能量吸收、横向膨胀、，以及屈服强度在40至140 ksi（抗拉强度为60至150 ksi）范围内的五种钢的断裂外观标准，以及对应于四分之一、半宽度、单宽度和双宽度夏比V型缺口冲击试样的厚度。五种钢（ABS-C、A302-B、HY-80、A517）的转变温度曲线- F、 和HY-130）在本公告中进行了总结。

Because of difficulties in establishing appropriate criteria for evaluating transition-temperature curves for steels of different strength and thickness, a study was initiated to investigate various energy-absorption, lateral-expansion, and fracture-appearance criteria for five steels having yield strengths in the range of 40 to 140 ksi (tensile strengths of 60 to 150 ksi) and for thicknesses corresponding to quarter-, half-, single-, and double-width Charpy V-notch impact-test specimens. The transition-temperature curves for the five steels (ABS-C, A302-B, HY-80, A517-F, and HY-130) are summarized in this bulletin.