(1)尺寸規(guī)格和允許偏差見表6-93、表6-94。
(mm)
| 外徑壁厚 | 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 | × | × | × | × | × | × | × | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 76(76.1) | × | × | × | × | × | × | × | × | × | × | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
83(82.5) 89(88.9) | × | × | × | × | × | × | × | × | × | × | × | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 95.5 | × | × | × | × | × | × | × | × | × | × | × | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
102(101.6) 105 | × | × | × | × | × | × | × | × | × | × | × | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
108 114(114.3) | × | × | × | × | × | × | × | × | × | × | × | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 121 | × | × | × | × | × | × | × | × | × | × | × | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 127.133 | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
140(139.7) 146 | - | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | - | - | - | - | - | - | - | - | - | - | - | - |
152(152.4) 159 | - | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | - | - | - | - | - | - | - | - | - | - | - | - |
| 168(168.3) | - | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | - | - | - | - | - | - | - | - | - |
| 180(177.8) | - | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | - | - | - | - | - | - | - | - | - |
| 194(193.7) | - | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | - | - | - | - | - | - | - | - | - |
| 203 | - | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | - | - | - | - | - | - | - | - |
219(219.1) 224 | - | - | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | - | - | - |
| 232 | - | - | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × |
245(244.5) 252 | - | - | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × |
| 273 | - | - | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × |
299 325(323.9) | - | - | - | × | × | × | × | × | × | × | × | X | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × |
| 355,377 | - | - | - | - | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × |
| 402 | - | - | - | - | - | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × |
注:括號內(nèi)的外徑表示相應的英制規(guī)格。
表6-94鋼管外徑和壁厚的允許偏差
| 鋼管尺寸/mm | 允許偏差(%) | ||
| 普通級 | 較高級 | ||
| 外徑 | ±1 | ±O.75 | |
| 壁厚 | ≤20 | ±12.5 | ±1O |
| >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不超過壁厚公差的80%。
2.鋼管的通常長度為3000-12000mm。
3.定尺和倍尺長度應在通常長度范圍內(nèi),其長度允許偏差為+20mm0。每個倍尺長度應按如下規(guī)定留出切口余量:
外徑≤159mm………………………………………………………5一1Omm
外徑>159mm………………………………·…………………··10-15mm
4.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)牌號和化學成分見表6_95。
表6-95液壓支柱用熱軋無縫鋼管的牌號和化學成分
| 牌號 | 化學成分(質(zhì)量分數(shù))(%) | |||||||||
| C | Si | Mn | - | - | Cr | Ni | Cu | Nb | RE(加入量) | |
| ≤ | ||||||||||
| 20 | 0.17~0.24 | 0.17~0.37 | O.35~0.65 | 0.035 | 0.035 | 0.25 | O.25 | 0.20 | - | - |
| 35 | 0.32~0.40 | O.17~O.37 | O.50~O.80 | O.035 | O.035 | O.25 | O.25 | O.20 | - | - |
| 45 | 0.42~0.50 | O.17~O.37 | O.50~O.80 | O.035 | 0.035 | 0.25 | O.25 | 0.20 | - | - |
| 27SiMn | O.24~O.32 | 1.10~1.40 | 1.10~1.40 | 0.035 | 0.035 | 0.030 | 0.030 | 0.030 | - | - |
| 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)力學性能見表6-96。
表6-96液壓支柱用熱軋無縫鋼管的力學性能
| 牌號 | 試樣熱處理制度 | 抗拉強度ób/MPa | 屈服點ó s/MPa | 伸長率δ 5(%) | 斷面收縮率(%) | 沖擊吸收功Aku2/J | 鋼管退火供應狀態(tài)布氏硬度HBS≤ |
| ≥ | |||||||
| 20 | 400 | 245 | 20 | - | - | - | |
| 35 | 51O | 305 | 17 | - | - | - | |
| 45 | 590 | 335 | 14 | - | - | - | |
| 27SiNn | (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 | - |
注:1.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,應在合同中注明。
2.壁厚不小于14mm鋼管應作沖擊試驗。
(4)用途適用于制造煤礦液壓支架和支柱的缸、柱。
©2008-2023 福建明海鑫企業(yè)股份有限公司 閩ICP備07035527號-1
閩公網(wǎng)安備 35040302610038號