收藏词条 编辑词条 液压支柱用热轧无缝钢管(GB/T17396-1998)
(1)尺寸规格和允许偏差见表6-93、表6-94。
表6-93液压支柱用热轧无缝钢管的尺寸规格 (mm)
外径壁厚 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
24 |
25 |
26 |
27 |
28 |
29 |
30 |
32 |
34 |
36 |
38 |
68 |
× |
× |
× |
× |
× |
× |
× |
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76(76.1) |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
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83(82.5) 89(88.9) |
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95.5 |
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102(101.6) 105 |
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108 114(114.3) |
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121 |
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× |
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127.133 |
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140(139.7) 146 |
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152(152.4) 159 |
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168(168.3) |
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× |
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× |
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180(177.8) |
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× |
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194(193.7) |
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203 |
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219(219.1) 224 |
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232 |
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245(244.5) 252 |
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273 |
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299 325(323.9) |
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X |
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355,377 |
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402 |
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注:括号内的外径表示相应的英制规格。
表6-94钢管外径和壁厚的允许偏差
钢管尺寸/mm |
允许偏差(%) |
||
普通级 |
较高级 |
||
外径 |
±1 |
±O.75 |
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壁厚 |
≤20 |
±12.5 |
±1O |
>20 |
+12.5 -10 |
注:1.根据需方要求,经供需双方协议,并在合同中注明,钢管同一横截面的壁厚不均应不超过壁厚公差的80%。
2.钢管的通常长度为3000
3.定尺和倍尺长度应在通常长度范围内,其长度允许偏差为+
外径≤
外径>
4.钢管的弯曲度不大于如下规定:
壁厚≤
壁厚>15~
壁厚>
(2)牌号和化学成分见表6_95。
表6-95液压支柱用热轧无缝钢管的牌号和化学成分
牌号 |
化学成分(质量分数)(%) |
|||||||||
C |
Si |
Mn |
P |
S |
Cr |
Ni |
Cu |
Nb |
RE(加入量) |
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≤ |
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20 |
0.17~0.24 |
0.17~0.37 |
O.35~0.65 |
0.035 |
0.035 |
0.25 |
O.25 |
0.20 |
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35 |
0.32~0.40 |
O.17~O.37 |
O.50~O.80 |
O.035 |
O.035 |
O.25 |
O.25 |
O.20 |
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45 |
0.42~0.50 |
O.17~O.37 |
O.50~O.80 |
O.035 |
0.035 |
0.25 |
O.25 |
0.20 |
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27SiMn |
O.24~O.32 |
1.10~1.40 |
1.10~1.40 |
0.035 |
0.035 |
0.030 |
0.030 |
0.030 |
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30MnNBRE |
0.27~O.36 |
O.20~0.60 |
1.20~1.60 |
0.035 |
0.035 |
0.030 |
0.030 |
0.030 |
0.020~0.050 |
0.02~O.04 |
(3)力学性能见表6-96。
表6-96液压支柱用热轧无缝钢管的力学性能
牌号 |
试样热处理制度 |
抗拉强度 ób/MPa |
屈服点 ó s/MPa |
伸长率 δ 5(%) |
断面收缩率 (%) |
冲击吸收功 Aku2/J |
钢管退火供应状态 布氏硬度HBS≤ |
≥ |
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20 |
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400 |
245 |
20 |
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35 |
51O |
305 |
17 |
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45 |
590 |
335 |
14 |
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27SiNn |
(920±20)℃水淬 (450±50)℃回火 冷却剂:油或水 |
980 |
835 |
12 |
40 |
39 |
217 |
30MnNbRE |
(880±20)℃水淬 (450±50)℃回火 冷却剂:空冷 |
850 |
720 |
13 |
45 |
48 |
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注:1.钢管以热轧状态交货。需方要求以退火或调质状态交货时,应在合同中注明。
2.壁厚不小于
(4)用途适用于制造煤矿液压支架和支柱的缸、柱。