6 材料
6.1 材料技术条件
材料牌号、化学成分、铁素体晶粒度和力学性能等材料技术条件,应符合附录A的规定。
6.2 适用的紧固件
细晶非调质钢线材适用的紧固件产品、规格和性能等级应符合表2的规定。
表2 适用的紧固件产品、规格和性能等级
材料牌号 | 螺纹公称直径 | 性能等级 | 适用的产品 |
MFT8 | 5~16 | 8.8F、08.8F | 螺栓、螺钉、螺柱和螺杆 |
MFT9 | 5~16 | 9.8F、09.8F | |
MFT10 | 5~16 | 10.9F、010.9F | 螺柱和螺杆 |
6.3 推荐的工艺
为保证冷加工成形的螺栓、螺钉、螺柱和螺杆的性能,应进行稳定化处理。推荐的细晶非调质钢热轧盘条加工紧固件的使用准则,见附录B。
7 机械和物理性能
在环境温度为10℃~35℃(夏比摆锤冲击试验为-20℃)的条件下,按第9章规定的试验方法进行试验时,紧固件产品应符合表3的规定。
第8章规定了各种型式尺寸紧固件可适用的试验方法。
注:即使紧固件的材料性能符合表2和表3的规定,但由于尺寸原因,某些型式的紧固件也会降低承载能力(见8.2和9.3)。
表3 螺栓、螺钉和螺柱的机械和物理性能
分项条号 | 机械和物理性能 | 性能等级 | |||
8.8F | 9.8F | 10.9F | |||
1 | 抗拉强度Rm/MPa | 公称a | 800 | 900 | 1000 |
min | 800 | 900 | 1040 | ||
2 | 规定非比例伸长0.2%的应力,RP0.2/MPa | 公称a | 640 | 720 | 900 |
min | 640 | 720 | 940 | ||
3 | 保证应力SPb/MPa | 公称 | 580 | 650 | 830 |
保证应力比SP,公称/RP0.2 min | 0.91 | 0.90 | 0.88 | ||
4 | 机械加工试件的断后伸长率A/% | min | 12 | 10 | 9 |
5 | 机械加工试件的断面收缩率Z/% | min | 52 | 48 | 48 |
6 | 头部坚固性 | 不得断裂 | |||
7 | 维氏硬度 HV F≥98N | min | 250 | 290 | 320 |
max | 320 | 360 | 380 | ||
8 | 布氏硬度 HBW F=30D2 | min | 238 | 276 | 304 |
max | 304 | 342 | 361 | ||
9 | 洛氏硬度 HRC | min | 22 | 28 | 32 |
max | 32 | 37 | 39 | ||
10 | 破坏扭矩MB/Nm | min | 见GB/T 3098.13 | ||
11 | 吸收能量KVc,d/J | min | 27 | ||
12 | 表面缺陷 | GB/T 5779.1e | |||
a 性能等级的标记制度仅要求规定公称值,见第5章。 b 表5和表7规定了保证载荷。 C 在-20℃试验温度下测定的数值。 d 适用于d=l6mm。 e 如用GB/T 5779.3 代替,应由供需双方协议。 |
表4~表7规定了最小拉力载荷和保证载荷。
表4 最小拉力载荷——粗牙螺纹
螺纹规格a d | 公称应力截面积 AS,公称b/mm2 | 性能等级 | ||
8.8F | 9.8F | 10.9F | ||
最小拉力载荷,Fm,min(AS,公称×Rm,min)/N | ||||
M5 | 14.2 | 11350 | 12800 | 14800 |
M6 | 20.1 | 16100 | 18100 | 20900 |
M7 | 28.9 | 23100 | 26000 | 30100 |
M8 | 36.6 | 29200c | 32900 | 38100c |
M10 | 58 | 46400c | 52200 | 60300c |
M12 | 84.3 | 67400 | 75900 | 87700 |
M14 | 115 | 92000 | 104000 | 120000 |
M16 | 157 | 125000 | 141000 | 163000 |
a 在螺纹标记中不标记螺距者,应为粗牙螺距。 b AS,公称的计算见9.1.6.1。 C 用于热浸镀锌的6az螺纹紧固件,可按GB/T 5267.3附录A降低数值。 |
表5 保证载荷——粗牙螺纹
螺纹规格a d | 公称应力截面积 AS,公称b/mm2 | 性能等级 | ||
8.8F | 9.8F | 10.9F | ||
最小拉力载荷,Fm,min(AS,公称×Rm,min)/N | ||||
M5 | 14.2 | 8230 | 9230 | 11800 |
M6 | 20.1 | 11600 | 13100 | 16700 |
M7 | 28.9 | 16800 | 18800 | 24000 |
M8 | 36.6 | 21200c | 23800 | 30400c |
M10 | 58 | 33700c | 37700 | 48100c |
M12 | 84.3 | 48900 | 54800 | 70000 |
M14 | 115 | 66700 | 74800 | 95500 |
M16 | 157 | 91000 | 102000 | 130000 |
a 在螺纹标记中不标记螺距者,应为粗牙螺距。 b AS,公称的计算见9.1.6.1。 c 用于热浸镀锌的6az螺纹紧固件,可按GB/T 5267.3附录A降低数值。 |
表6 最小拉力载荷——细牙螺纹
螺纹规格 d×P | 公称应力截面积 AS,公称a/mm2 | 性能等级 | ||
8.8F | 9.8F | 10.9F | ||
最小拉力载荷,Fm,min(AS,公称×Rm,min)/N | ||||
M8×1 | 39.2 | 31360 | 35300 | 40800 |
M10×1 | 64.5 | 51600 | 58100 | 67100 |
M10×1.25 | 61.2 | 49000 | 55100 | 63600 |
M12×1.25 | 92.1 | 73700 | 82900 | 95800 |
M12×1.5 | 88.1 | 70500 | 79300 | 91600 |
M14×1.5 | 125 | 100000 | 112000 | 130000 |
M16×1.5 | 167 | 134000 | 150000 | 174000 |
a AS,公称的计算见9.1.6.1。 |
表7 保证载荷一细牙螺纹
螺纹规格 d×P | 公称应力截面积 AS,公称a/mm2 | 性能等级 | ||
8.8F | 9.8F | 10.9F | ||
保证载荷,FP(AS,公称×SP)/N | ||||
M8×1 | 39.2 | 22700 | 25500 | 32500 |
M10×1 | 64.5 | 37400 | 41900 | 53500 |
M10×1.25 | 61.2 | 35500 | 39800 | 50800 |
M12×1.25 | 92.1 | 53400 | 59900 | 76400 |
M12×1.5 | 88.1 | 51100 | 57300 | 73100 |
M14×1.5 | 125 | 72500 | 81200 | 104000 |
M16×1.5 | 167 | 96900 | 109000 | 139000 |
a AS,公称的计算见9.1.6.1。 |
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