Q235方矩管高的成型難度江蘇方矩管廠家生產(chǎn)銷售
(3)產(chǎn)品超厚
大規(guī)格厚壁冷彎方矩形鋼管工藝所生產(chǎn)的方矩形管最大厚度達(dá)19mm,超厚不僅體現(xiàn)在絕對(duì)厚度上,還體現(xiàn)在產(chǎn)品的相對(duì)厚度上。對(duì)厚度是冷彎成型難易的一個(gè)重要指標(biāo),方管用邊厚比表示。目前國(guó)內(nèi)外普遍認(rèn)為,邊厚比低于10時(shí)產(chǎn)品具有很高的成型難度。工藝所生產(chǎn)的方矩形管,其小斷面大壁厚產(chǎn)品邊厚比可達(dá)7,如100mm*100mm*14mm、120mm*120mm*16mm等。
(4)耐火
B490RNQ熱卷鋼制成的冷彎大規(guī)格厚壁方矩形鋼管,其室溫力學(xué)性能完全滿足和超過國(guó)標(biāo)Q345B的要求,其成形加工性能相當(dāng)或優(yōu)于Q345B,屈強(qiáng)比滿足國(guó)家建筑行業(yè)規(guī)范關(guān)于抗震性的要求。同時(shí)其高溫性能明顯優(yōu)于同等級(jí)別的Q345B,600時(shí)B490RNQ的屈服強(qiáng)度仍保持在310MPa,遠(yuǎn)遠(yuǎn)高于2/3 室溫屈服強(qiáng)度,而Q345B在500工藝對(duì)壁厚8mm 以上屈服強(qiáng)度已低于2/3 室溫屈服強(qiáng)度。
另外B490RNQ 鋼種還具有優(yōu)良的耐腐蝕性能,所以具有耐火耐候性能的建筑工程用冷彎厚壁方矩形鋼管將在相當(dāng)程度上節(jié)省防火材料的應(yīng)用。室內(nèi)鋼桁架屋蓋采用此類鋼構(gòu)件時(shí)甚至可以免去防火防銹涂料的工序,這既能減少工程量、降低工程造價(jià),又能充分發(fā)揮方矩形鋼管外形美觀的視覺效果,有很好的綜合效益。
方形、矩形管規(guī)格表
W=0.02491PIT(D-T) W=(KG/M),T=壁厚,D=外徑,M=6米
D\T |
0.4 (0.25) |
0.5 (0.28) |
0.6 (0.31) |
0.7 (0.35) |
0.8 (0.45) |
0.9 (0.55) |
1.0 (0.65) |
1.2 (0.75) |
1.5 |
2.0 |
2.5 |
17x17 |
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19x19 |
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20x20 |
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22x22 |
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25x25 |
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28x28 |
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30x30 |
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36x36 |
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38x38 |
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47x47 |
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50x50 |
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25x13 |
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30x15 |
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38x25 |
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50x25 |
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75x45 |
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23x11 |
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28x13 |
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34x22 |
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48x23 |
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73x43 |
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