液压支柱用热轧无缝钢管的尺寸规格型号 (mm)
外径壁厚 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
2l |
22 |
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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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12l |
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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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180(177.8) |
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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。
液压支柱用热轧无缝钢管外径和壁厚的允许偏差
±l |
±O.75 | ||
≤20 |
±12.5 |
±lO | |
>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.液压支柱用热轧无缝钢管的通常长度为3000—12000mm。
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+20mm0。每个倍尺长度应按如下规定留出切口余量:
外径≤159mm………………………………………………………5一lOmm
外径>159mm………………………………·…………………··10—15mm
4.液压支柱用热轧无缝钢管的弯曲度不大于如下规定:
壁厚≤15mm……………………………………………………1.3mm/m
壁厚>15~30mm…………………………………………………1.5mm/m
壁厚>30mm…………………………………………………2mm/m
(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 |
||||||||||
C |
Si |
Mn |
P |
S |
Cr |
Ni |
Cu |
Nb |
RE(加入量) | |
≤ | ||||||||||
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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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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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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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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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。
液压支柱用热轧无缝钢管的力学性能
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 |
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≥ | |||||||
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400 |
20 |
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5lO |
305 |
17 |
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590 |
335 |
14 |
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(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.液压支柱用热轧无缝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.液压支柱用热轧无缝钢管壁厚不小于14mm钢管应作冲击试验。
(4)液压支柱用热轧无缝钢管用途适用于制造煤矿液压支架和支柱的缸、柱。