液壓支柱用熱軋無縫鋼管的尺寸規(guī)格型號(hào) (mm)
外徑壁厚 |
6 |
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11 |
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20 |
2l |
22 |
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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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355,377 |
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402 |
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注:括號(hào)內(nèi)的外徑表示相應(yīng)的英制規(guī)格。
液壓支柱用熱軋無縫鋼管外徑和壁厚的允許偏差
±l |
±O.75 | ||
≤20 |
±12.5 |
±lO | |
>20 |
+12.5
-10 |
注:1.根據(jù)需方要求,經(jīng)供需雙方協(xié)議,并在合同中注明,鋼管同一橫截面的壁厚不均應(yīng)不超過壁厚公差的80%。
2.液壓支柱用熱軋無縫鋼管的通常長度為3000—12000mm。
3.定尺和倍尺長度應(yīng)在通常長度范圍內(nèi),其長度允許偏差為+20mm0。每個(gè)倍尺長度應(yīng)按如下規(guī)定留出切口余量:
外徑≤159mm………………………………………………………5一lOmm
外徑>159mm………………………………·…………………··10—15mm
4.液壓支柱用熱軋無縫鋼管的彎曲度不大于如下規(guī)定:
壁厚≤15mm……………………………………………………1.3mm/m
壁厚>15~30mm…………………………………………………1.5mm/m
壁厚>30mm…………………………………………………2mm/m
(2)牌號(hào)和化學(xué)成分見表6_95。
表6-95液壓支柱用熱軋無縫鋼管的牌號(hào)和化學(xué)成分
牌號(hào) |
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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)力學(xué)性能見表6-96。
液壓支柱用熱軋無縫鋼管的力學(xué)性能
抗拉強(qiáng)度
ób/MPa |
屈服點(diǎn)
ó s/MPa |
伸長率
δ 5(%) |
斷面收縮率
(%) |
沖擊吸收功
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
冷卻劑:油或水 |
980 |
835 |
12 |
40 |
39 |
217 | |
30MnNbRE |
(880±20)℃水淬
(450±50)℃回火
冷卻劑:空冷 |
850 |
720 |
13 |
45 |
48 |
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注:1.液壓支柱用熱軋無縫鋼管以熱軋狀態(tài)交貨。需方要求以退火或調(diào)質(zhì)狀態(tài)交貨時(shí),應(yīng)在合同中注明。
2.液壓支柱用熱軋無縫鋼管壁厚不小于14mm鋼管應(yīng)作沖擊試驗(yàn)。
(4)液壓支柱用熱軋無縫鋼管用途適用于制造煤礦液壓支架和支柱的缸、柱。