平面弹簧扁钢技术条件NG/NK019-2008本标准适用于热轧平面弹簧扁钢。1、尺寸、外形及允许偏差1.1弹簧扁钢的截面形状应符合图1的规定。B——扁钢的宽度H——扁钢的厚度R——扁钢侧面圆弧（R只在孔型上控制，不作为验收条件。R≈1/2H）图1平面弹簧扁钢1.2弹簧扁钢的尺寸及允许偏差应符合表1的规定。表1弹簧扁钢的尺寸及允许偏差mm截面尺寸（mm）允许偏差截面尺寸（mm）允许偏差截面尺寸（mm）允许偏差宽度≤50宽度＞50~60宽度＞60~70厚度6~8±0.156~7±0.156~7±0.18＞8~12±0.18＞7~9±0.18＞7~12±0.20＞12~20±0.20＞9~20±0.20＞12~20±0.25＞20~30±0.20＞20~30±0.25＞20~30±0.30＞30－＞30－＞30±0.30宽度≤50±0.55＞50~60±0.60＞60~70±0.75截面尺寸（mm）允许偏差截面尺寸（mm）允许偏差截面尺寸（mm）允许偏差截面尺寸（mm）允许偏差宽度＞70~80宽度＞80~90宽度＞90~100宽度＞100厚度8~10±0.207~12±0.207~12±0.207~12±0.20＞10~12±0.25＞12~20±0.25＞12~20±0.25＞12~20±0.25＞12~20±0.30＞20~30±0.30＞20~30±0.30＞20~30±0.30＞20~30±0.35＞30±0.35＞30±0.35＞30±0.35＞30±0.40宽度＞70~80±0.80＞80~90±0.80＞90~100±0.80＞100±1.01.3弹簧扁钢的平面厚度差，在宽度的两端测量时，应不大于厚度公差的25%（但最小值为0.1mm），宽面中部不得凸起。1.4弹簧扁钢每米长度的侧向弯曲度（镰刀弯）不大于3mm，总侧弯度不大于扁钢总长度的0.30%mm。平弯：扁钢厚度＜7，不大于5.0mm/m，扁钢厚度≥7不大于4.0mm/m。1.5普通长度4～7m，定尺、倍尺长度应在合同中注明，其允许偏差为0～＋40mm。2、技术要求2.1弹簧扁钢的化学成份（熔炼成份）应符合表2规定表2.1国内弹簧扁钢化学成份（GB/T1222-2007）%1平面弹簧扁钢技术条件NG/NK019-2008标准牌号适用厚度化学成份%CSiMnCrVBNiCuPS不大于国标60Si2Mn\0.56~0.641.50~2.000.70~1.00≤0.35\\0.350.250.0350.035内控60Si2Mn＜120.57~0.601.55~1.650.71~0.800.12~0.18\\0.300.200.0250.02560Si2Mnb≥120.57~0.601.60~1.700.77~0.850.17~0.23\\0.300.200.0250.025国标55SiMnVB\0.52~0.600.70~1.001.00~1.30≤0.350.08~0.160.0005~0.00350.350.250.0350.035内控55SiMnVB≤180.52~0.560.70~0.851.00~1.10≤0.300.08~0.130.0010~0.00250.300.200.0250.02555SiMnVBb＞180.53~0.570.80~0.951.10~1.20≤0.300.10~0.150.0015~0.00300.300.200.0250.025国标55CrMnA\0.52~0.600.17~0.370.65~0.950.65~0.95\\0.350.250.0250.025内控55CrMnA≤160.52~0.560.17~0.370.70~0.800.70~0.80\\0.300.200.0200.02055CrMnAb＞160.53~0.570.17~0.370.75~0.850.75~0.85\\0.300.200.0200.020国标60CrMnA\0.56~0.640.17~0.370.70~1.000.70~1.00\\0.350.250.0250.025内控60CrMnA≤180.56~0.600.17~0.370.75~0.850.75~0.85\\0.300.200.0200.02060CrMnAb＞180.57~0.610.17~0.370.80~0.900.80~0.90\\0.300.200.0200.020国标50CrVA\0.46~0.540.17~0.370.50~0.800.80~1.100.10~0.20\0.350.250.0250.025内控50CrVA≤180.46~0.500.17~0.350.60~0.700.85~0.950.10~0.16\0.300.200.0200.02050CrVAb＞180.47~0.510.17~0.350.65~0.750.95~1.050.13~0.18\0.300.200.0200.020国标60CrMnBA\0.56~0.640.17~0.370.70~1.000.70~1.000.0005~0.00400.350.250.0250.025内控60CrMnBA\0.56~0.600.17~0.370.70~0.900.70~0.90\0.0010~0.00300.300.200.0200.020国标28MnSiB\0.24~0.320.60~1.001.20~1.60≤0.25\0.0005~0.00350.350.250.0350.035内控28MnSiB≤100.26~0.300.70~0.851.30~1.40≤0.25\0.0015~0.00300.300.200.0250.02528MnSiBb＞100.28~0.320.80~0.951.35~1.45≤0.25\0.0020~0.00350.300.200.0250.025协议标准52CrMnBA\0.48~0.530.17~0.370.70~1.000.80~1.10Ti≤0.010.0008~0.00250.350.250.0300.030内控52CrMnBA\0.48~0.520.17~0.370.75~0.900.85~1.00\0.0008~0.00150.300.200.0200.020表2.2日标弹簧扁钢化学成份（JISG4801-2005）%标准牌号适用厚度CSiMnCrVNiCuPS不大于日标SUP6\0.56~0.641.50~1.800.70~1.00\\0.300.300.0300.0302平面弹簧扁钢技术条件NG/NK0...
