JB/T 6655-2013耐热圆柱螺旋压缩弹簧永久变形测试，将弹簧用试验负荷压缩三次，测量第二次和第三次压缩后自由高度的变化值。当试验负荷高于压拔负荷时，该负荷视为试验负荷。压并负荷的最大值应小于理论压并负荷的1.5倍。HRJ Spring Tester；JB/T 6655-2013适用于工作温度在200℃～550℃的圆截面材料冷卷或热卷耐热圆柱螺旋压缩弹簧。

JB/T 6655-2013耐热圆柱螺旋压缩弹簧技术条件；指定变形量下的弹簧负荷试验；指定变形量下的弹簧刚度试验；弹簧旋绕比C=D/d；旋绕比≥3～8，＞8～15，＞15～22；自由高度H0≤250mm，H0＞250～500mm，H0＞500mm；HRJ Spring Tester；弹簧加温强压处理，测定弹簧永久变形；弹簧热松弛试验，计算弹簧负荷损失率；指定高度下施加负荷，测定弹簧变形量和弹簧刚度；

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