UNI 6787-1971
具有无金属疲乏特性和韧性的特种合金钢锻造轴.改良轴.用于铁路车辆的轮副.质量,规定和试验
Forged special alloyed steel hardened and tempered axles with high characteristics of fatigue and of toughness, for wheel sets of railway vehicles and traction units. Quality, requirements and tests.