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[1]。該鋼材采用轉(zhuǎn)爐或電爐冶煉，可結(jié)合爐外精煉工藝，碳當(dāng)量約0.3%（低于一般冷裂紋敏感閾值），以熱軋、正火或熱機械軋制狀態(tài)交貨。其屈服強度隨厚度不同分布在265-345MPa，抗拉強度為450-630MPa，性能與德國S355J2、美國ASTM A529MGr50等國際同級材料相當(dāng) [1]。主要應(yīng)用于建筑、橋梁、機械制造及壓力容器領(lǐng)域，厚板焊接需按材料說明預(yù)熱。相比同系列其他等級，Q345D憑借更低的雜質(zhì)含量和更優(yōu)的低溫韌性，市場價格相對較高 [1]。中文名Q345D別 名Q345D無縫鋼管C≤0.18；S i≤0.50；M n≤1.70目錄1簡介2定義3國際比較4規(guī)格尺寸5焊接性能6Q345鋼比較簡介播報編輯1.Q345D為低合金鋼板2.執(zhí)行標(biāo)準(zhǔn)：GB/T1591-2008 《低合金高強度結(jié)構(gòu)鋼》3Q345D鋼材與Q345A、B、C鋼相比而言。低溫沖擊功的試驗溫度低（-20℃最小27J）4.機械性能好。含有害物質(zhì)P，S量比Q345A、B、C要低。5.市場價格比Q345A、B、C要高定義播報編輯Q345D為低合金板1 ：牌號表示方法鋼的牌號由代表屈服強度的漢語拼音字母，屈服強度數(shù)值，質(zhì)量等級符號三個部分組成，例如：Q345D。其中：Q—鋼的屈服強度的“屈”字漢語拼音首位字母；345—屈服強度數(shù)值，單位MPa；D—質(zhì)量等級為D級（等級分為A,B,C,D,E）。當(dāng)需方需要鋼板具有厚度方向性能時，則在上述規(guī)定的牌號后加上代表厚度方向（Z向）性能級別的符號，例如：Q345DZ15。2 ：執(zhí)行標(biāo)準(zhǔn)：GB/T1591、GB/T3274。3 ：化學(xué)成分：碳C：≤0.18；硅Si：≤0.50；錳Mn：≤1.70；P：≤0.030；S：≤0.025；Nb：≤0.07；V：≤0.15；鈦Ti：≤0.20；鉻Cr：≤0.30；鎳Ni：≤0.50；銅Cu：≤0.30；N：≤0.012；鉬Mo：≤0.10；Al：≥0.015。4 ：力學(xué)性能屈服：≤16mm：≥345；16—40mm：≥335；40—63mm：≥325；63—80mm：≥315；80—100mm：≥305；100—150mm：≥285；150—200mm：≥275；200—250：≥275；250—400：≥265。抗拉強度：450—630。伸長率：≥21。沖擊試驗：-20℃：≥34。5 ：冶煉方法鋼由轉(zhuǎn)爐或電爐冶煉，必要時加爐外精煉。6 ：交貨狀態(tài)鋼材以熱軋，控扎，正火，正火+回火，熱機械軋制（TMCP）狀態(tài)交貨。國際比較播報編輯Q345D是中國常用的低合金板材。和德國的S355J2，美國的ASTM A529MGr50 是同一級別，化學(xué)成分略有差異，機械性能相同。在正火的交貨條件下，和德國的S355J2G3是相同,甚至和S355J2G4在性能上幾乎一樣?？梢蕴鎿Q使用。規(guī)格尺寸播報編輯鋼號Q345D厚度*寬度*長度（mm）重量（噸）現(xiàn)貨 定軋低合金鋼Q345D8*2070-3800*6100-1200016.012T低合金鋼Q345D9*1500-4020*3000-1800070T低合金鋼Q345D10*1600-3820*6000-9000210.463T低合金鋼Q345D11*2000-2200*8850-100012.681T低合金鋼Q345D12*2200-2650*8200-1060035.705T低合金鋼Q345D13*2000-2500*9000-1235023.071T低合金鋼Q345D14*1710-2800*6000-1255040T低合金鋼Q345D15*2000-2440*6300-1100015.683T低合金鋼Q345D16*1800-2300*5600-830030T低合金鋼Q345D17*1800-2600*8000-950019.256T低合金鋼Q345D18*2080-3500*7730-12000700.271T低合金鋼Q345D19*2000-2440*7000-1260044.639T低合金鋼Q345D20*2440-3250*11000-1260090129T低合金鋼Q345D20*1600-3250*6600-900073.061T低合金鋼Q345D21*2000-3090*11100-12000213.113T低合金鋼Q345D22*2440-3110*6100-11140300.078T低合金鋼Q345D23*1870-2880*8000-1250026.441T低合金鋼Q345D24*1900-2880*6600-12500465.973T低合金鋼Q345D25*3080-3250*11000-12000172.137T低合金鋼Q345D25*1720-2400*4600-12700182.161T低合金鋼Q345D26*2020-2800*8900-10000200.607T低合金鋼Q345D27*1800-2500*9550-1285051.646T低合金鋼Q345D28*2300-2330*6200-10000120.768T低合金鋼Q345D29*3230-2440*6200-1290036.53T低合金鋼Q345D30*1800-2520*6220-11800130.313T低合金鋼Q348D31*2270-3020*8500-1060029.806T低合金鋼Q345D32*2370-2500*10500-11200136.921T低合金鋼Q345D34*2440-2600*7656-12700120.30T低合金鋼Q345D35*1800-3150*5500-850039.671T.低合金鋼Q345D36*2250-2500*9200-12000270.806T低合金鋼Q345D37*2300-3020*4300-23600116.706T低合金鋼Q345D38*1800-2440*8800-1130043.499T低合金鋼Q345D40*2300-2520*7000-12700250.278T低合金鋼Q345D42*1900-2950*8700-1302090.188T低合金鋼Q345D43-44*2000-3000*1000026.154T低合金鋼Q345D45*1800-2400*6500-1100073.815T低合金鋼Q345D46*2060-2540*7050-11900280.289T低合金鋼Q345D47*2550-2750*12600-950069.107T低合金鋼Q345D50*2350-2600*10800-12500720.793T低合金鋼Q345D52*2000-3080*8980-12100150.331T低合金鋼Q345D53-55*2000-3000*10000149.773T低合金鋼Q345D56*2000-2680*10800155.881T低合金鋼Q345D58*2550-2520*8200-7360122.32T低合金鋼Q345D60*1800-2320*5900-1270072066.073T低合金鋼Q345D61-64*2000-3000*1000014.679T低合金鋼Q345D65*2000-2300*8460-1000037.61T低合金鋼Q345D66-69*2100-3000*1000027.59T低合金鋼Q345D70*2000-2350*8650-11800630.763T低合金鋼Q345D71-74*2000-3000*10000定低合金鋼Q345D75*2600-1900*9900-1065056.302T低合金鋼Q345D76*2000-2800*6850-1100027.63T低合金鋼Q345D77-79*2000-3000*1000017.49T低合金鋼Q345D80*2000-2120*8000-12050810.77T低合金鋼Q345D82*2000-3640*9650-1200090.946T低合金鋼Q345D85*2220-2330*9950-1005033.886T低合金鋼Q345D86-89*2600-3000*1035073.456T低合金鋼Q345D90*2000-2450*9000-113002100T低合金鋼Q345D91-99**2000-3000*1000012.63T低合金鋼Q345D100*2000-2450*5500-12000180.378T低合金鋼Q345D102*1900-3400*6400-11200110.909T低合金鋼Q345D104-106*2250-3500*9540-12000270.242T低合金鋼Q345D108*1550-3400*8500-11400120.918T低合金鋼Q345D110*500-2500*800-11200350.243T低合金鋼Q345D112*1860-2380*8550-12350270.463T低合金鋼Q345D114-115*700-2330*2700-11100156.533T低合金鋼Q345D116*2190-3600*7700-10840254.866T低合金鋼Q345D118*1800-3940*7400-12000100.162T低合金鋼Q345D120*1800-2600*9200-10050240.296T低合金鋼Q345D122*2020-3500*800-13000150.879T低合金鋼Q345D124-125*1670-2380*5450-10450165.421T低合金鋼Q345D126*2600-3900*8450-12000120.275T低合金鋼Q345D128-130*700-2500*8400-10050400.117T低合金鋼Q345D130*2230-2600*9000-11100190.396T低合金鋼Q345D134-135*2020-2580*9700-13000172.914T低合金鋼Q345D136*2460-3400*8450-10000370.772低合金鋼Q345D138*1670-2400*7550-900026.659T低合金鋼Q345D140*2260-2500*9700-12270456.369T低合金鋼Q345D141-145*2200-3500*8100-12000120.415T低合金鋼Q345D146-150*2350-3450*9000-11000320.628T低合金鋼Q345D152*2020-2800*8750-13000110.249T低合金鋼Q345D154*2500-3200*8700-12500240.938T低合金鋼Q345D156-160*550-2350*8540-10650331.039T低合金鋼Q345D162*2000-3380*8100-11100120.044T低合金鋼Q345D164*2450-3200*7600-12000245.512T低合金鋼Q345D165-170*2380-3200*8600-12500189.253T低合金鋼Q345D172-178*2100-2800*7050-10000140.429T低合金鋼Q345D180*1770-2370*8230-10600450.113T低合金鋼Q345D182-184*2250-3300*8000-12000190.491T低合金鋼Q345D185-190*1700-2380*7700-10100263.973T低合金鋼Q345D192*1500-2650*7000-9900150.826T低合金鋼Q345D194*2650-3390*8600-11000190.102T低合金鋼Q345D196-200*1950-2600*7750-9000280.959T低合金鋼Q345D202-206*2140-2800*8300-12000280.723T低合金鋼Q345D236-240*1900-2800*7180-12000300.401T低合金鋼Q345D241-245*1700-2800*7700-11200250.175T低合金鋼Q345D246-250*2360-3400*8500-13000280.211T低合金鋼Q345D252*2230-3200*4900-850050.762T低合金鋼Q345D253-260*2000-2800*8520-13000340.092T低合金鋼Q345D266*1950-2860*5000-980020.359T低合金鋼Q345D268-270*2220-2500*7250-11000280.486T低合金鋼Q345D271-275*1980-2560*8500-1200018.166T低合金鋼Q345D292-295*1560-2160*7500-1000080.481T低合金鋼Q345D360*2160-2800*7000-1100042.975T低合金鋼Q345D大量規(guī)格未列出，可雙定尺定軋大量低合金鋼焊接性能播報編輯Q345D鋼板焊接需要先預(yù)熱，因含碳量比較高。1、預(yù)熱的目的是為了防止冷裂紋的產(chǎn)生。冷裂紋與碳當(dāng)量有直接關(guān)系。因而要分清該材料的碳當(dāng)量，Q345A（以前的牌號叫16Mn）、Q345D的碳當(dāng)量是一樣的。Q345的碳當(dāng)量0.3%不到，可以說焊接性還可以（一般說碳當(dāng)量0.4%上以冷裂紋敏感性增大）。 所以Q345A通常情況下是不預(yù)熱的。但是當(dāng)板很厚時，由于冷卻很快，還是要預(yù)熱。曾經(jīng)20#鋼用J422（E4303）焊裂過。如果板厚在70mm以上，不預(yù)熱風(fēng)險很大。2、順便說一下，這個Q345D與平時常用的Q345A區(qū)別就在于雜質(zhì)S、P更少，低溫沖擊性能更好。從焊接角度說，當(dāng)母材雜質(zhì)元素少了，對于控制焊接熱裂紋是有好處的。3、當(dāng)然既然母材選擇Q345D材料（比Q345A貴，且供貨少），一般說都是有特殊用途，所以焊接材料不會隨便選用，最好是按焊接材料說明書使用，如果焊條說明書說要對母材預(yù)熱，那就預(yù)熱。因為沒有按廠家說明書使用焊接材料，焊縫性能會大打折扣的。Q345鋼比較播報編輯Q345A 含磷和硫都小于等于0.045%Q345B 含磷和硫都小于等于0.040%Q345C 含磷和硫都小于等于0.035%Q345D 含磷和硫都小于等于0.030%Q345E 含磷和硫都小于等于0.025%而磷和硫雜質(zhì)元素在鋼中越多其沖擊韌性就越差Q345A - Q345B 20攝氏度時aKV不小于34Q345C 0攝氏度時aKV不小于34Q345D -20攝氏度時aKV不小于34Q345E -40攝氏度時aKV不小于27終其原因就是鋼中的P和S雜質(zhì)元素的減少才促使了低溫下沖擊韌性的提高.一個是Q345化學(xué)成分一個是Q345的力學(xué)性能。新手上路成長任務(wù)編輯入門編輯規(guī)則本人編輯我有疑問內(nèi)容質(zhì)疑在線客服官方貼吧意見反饋投訴建議舉報不良信息未通過詞條申訴投訴侵權(quán)信息封禁查詢與解封?2025?Baidu?使用百度前必讀?|?百科協(xié)議?|?隱私政策?|?百度百科合作平臺?|?京ICP證030173號?京公網(wǎng)安備11000002000001號window.PAGE_DATA= 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Q345D價格行情 Q345D新庫存 Q345D卷板/中厚板 具有較高的強度、較好的塑性和切削加工性能，一定的焊接性能。小型零件可以淬火強化。 Q345D/現(xiàn)貨庫存；Q345D； 5*1500*6000 6*1500*6000 8*1500*6000 10*1500*6000 12*1500*6000 14*1500*6000Q345D； 16*2000*8000 18*2000*8000 20*2200*8000 22*2200*6000 24*2200*6000Q345D； 25*2200*6000 30*2200*8000 35*2200*9000 40*2400*8000 45*2400*6000Q345D； 50*2400*5000 55*2400*5500 60*2500*6000Q345D； 6*1500/6000 8*1500*6000 10*1500*6000 12*1500*6000 14*2000*6000 16*2200*6000Q345D； 18*2200*6000 20*2200*6000 25*2200*6000 30*2400*6850 35*2350*6580 40*1800*8500Q345D； 45*2500*6000 50*2500*8000 55*2500*6000 60*2500*6000
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