１.外径-壁厚*壁厚*0.0387*弯曲半径÷1000, ＝90°弯头的理论重量
举例：426*10 90°R＝1.5D的
（426-10）×10×1.387×R600÷1000＝96.59kg
180°弯头按表2倍计算，45°按1/2计算；
２..（外径-壁厚）*壁厚* 0.02466 * R倍数 * 1.57 * 公称通径 ＝ 90°弯头的理论重量
举例：426*10 90°R＝1.5D的
（426-10）×10×0.02466×1.5D×1.57×400＝96.6kg
180°弯头按表2倍计算，45°按1/2计算。
规格外径壁厚弯曲半径90度弯头标准重量
DN4004261061098.20512
10010842003.21984
10010841021.642118
15015961525.400043
200219620310.0401
250273925423.3556
3003251030537.18103
3003251045755.71059
250273938135.03341
80894761.000008
0
0
0
金属材料以及弯头理论重量计算方法
一、金属材料的理论重量计算方法(单位：公斤)
角钢：每米重量=0.00785*（边宽+边宽-边厚）*边厚
圆钢：每米重量=0.00617*直径*直径(螺纹钢和圆钢相同)
扁钢：每米重量=0.00785*厚度*边宽
管材：每米重量=0.02466*壁厚*（外径-壁厚）
不锈钢管：（外径-壁厚）×壁厚×0.02491=公斤/米
板材：每米重量=7.85*厚度
黄铜管：每米重量=0.02670*壁厚*（外径-壁厚）
紫铜管：每米重量=0.02796*壁厚*（外径-壁厚）
铝花纹板：每平方米重量=2.96*厚度
有色金属比重：紫铜板8.9黄铜板8.5锌板7.2铅板11.37
有色金属板材的计算公式为：每平方米重量=比重*厚度
一、 弯头重量计算公式
圆环体积=2X3.14X3.14(r^2)R
r--圆环圆半径
R--圆环回转半径
中空管圆环体积=2X3.14X3.14((r^2)-(r’^2))R
r’--圆环内圆半径
90，60，45度的弯头（肘管）体积分别是对应中空管圆环体积的1/4、1/6、1/8
钢的密度工程上计算重量时按7.85公斤/立方分米，密度*体积=重量（质量）。
1、180°弯头按表2倍计算，45°按1/2计算；
2、R1.0DN弯头重量按表2/3计算；
3、表中未列出壁厚的重量，可取与之相近的两个重量计算平均值；
4、90°弯头计算公式； 0.0387*S(D-S)R/1000 式中 S=壁厚mm D=外径mm R=弯曲半径mm
三、以下是焊接弯头的计算公式
１.外径-壁厚X壁厚X0.0387X弯曲半径÷1000, ＝９０°弯头的理论重量
举例：４２６*１０ ９０°Ｒ＝１.５Ｄ的 （４２６-１０）*１０*０.３８７*Ｒ６００÷１０００＝９６.５９Ｋg 180°弯头按表2倍计算，45°按1/2计算；
２..（外径-壁厚）X壁厚X０.０２４６６XＲ倍数X１.５７X公称通径＝９０°弯头的理论重量
序号名称公称通径外径壁厚mm单重单价20#单价304单价316L1弯头1521.320.0316162弯头1521.32.50.041.416183弯头1521.330.051.416184弯头1521.33.50.052.218185弯头1521.340.062.218206弯头1521.34.50.0742427弯头1521.350.0744448弯头1521.360.089弯头1521.370.0910弯头1521.380.0911弯头151820.031.2141612弯头15182.50.031.2161613弯头151830.04161614弯头15183.50.04161815弯头151840.05202216弯头15184.50.05242617弯头151850.0618弯头151860.0619弯头151870.0720弯头151880.0721弯头2026.920.061.6161822弯头2026.92.50.071.6182023弯头2026.930.111.6182024弯头2026.93.50.122.2182225弯头2026.940.142.2202426弯头2026.94.50.157222627弯头2026.950.167263028弯头2026.960.189.2465029弯头2026.970.1811.6525830弯头2026.980.1811.6566231弯头202520.051.4161832弯头20252.50.071.4161833弯头202530.101.6182034弯头20253.50.112.2182035弯头202540.122.2202236弯头20254.50.147222437弯头202550.157262838弯头202560.179.2445039弯头202570.1740弯头202580.1741弯头2533.720.092.2182042弯头2533.72.50.112.2182043弯头2533.730.142.2202244弯头2533.73.50.152.8202445弯头2533.740.182.8222446弯头2533.74.50.203.6242847弯头2533.750.213.6283048弯头2533.760.257384249弯头2533.770.279.2445050弯头2533.780.30第 1 页 序号名称公称通径外径壁厚mm单重单价20#单价304单价316L51弯头253220.091.6182052弯头25322.50.111.6182053弯头253230.132202254弯头25323.50.152.6202255弯头253240.162.6222456弯头25324.50.183.4242657弯头253250.203.4263058弯头253260.239.2363659弯头253270.2560弯头253280.2861弯头3242.420.152.6242662弯头3242.42.50.192.6242663弯头3242.430.222.6262864弯头3242.43.50.253283065弯头3242.440.283.4303466弯头3242.44.50.313.8323667弯头3242.450.343.8364068弯头3242.460.408.8424869弯头3242.470.4610.8545870弯头3242.480.5116.2586271弯头323820.132.6202472弯头32382.50.162.6222473弯头323830.202.6222674弯头32383.50.223.2242875弯头323840.253.2263076弯头32384.50.283.8283277弯头323850.313.8323678弯头323860.368.8384479弯头323870.410.8626880弯头323880.4516.2768082弯头4048.320.22263083弯头4048.32.50.27283084弯头4048.330.31283285弯头4048.33.50.363.8303486弯头4048.340.414.2343887弯头4048.34.50.455.2364088弯头4048.350.55.2404689弯头4048.360.596.2485490弯头4048.370.6910.4687691弯头4048.380.7210.4869492弯头404520.20262893弯头40452.50.25263094弯头404530.29283295弯头40453.50.343.6303496弯头404540.384343897弯头40454.50.424.4364298弯头404550.464.4404699弯头404560.5410.44854100弯头404570.62126272101弯头404580.698492102弯头505720.323638103弯头50572.50.403640104弯头505730.484044第 2 页 序号名称公称通径外径壁厚mm单重单价20#单价304单价316L105弯头50573.50.545.24248106弯头505740.625.84652107弯头50574.50.706.84856108弯头505750.766.85462109弯头505760.908.46472110弯头505771.02127282111弯头505781.15128090112弯头5060.320.343840113弯头5060.32.50.423842114弯头5060.330.54246115弯头5060.33.50.585.44450116弯头5060.340.666.24854117弯头5060.34.50.737.25260118弯头5060.350.817.25664119弯头5060.360.958.86676120弯头5060.371.0912.27686121弯头5060.381.2212.28496122弯头657620.564854123弯头65762.50.694854124弯头657630.825260125弯头65763.50.965664126弯头657641.09106070127弯头65764.51.2212.26678128弯头657651.3412.27286129弯头657661.61158498130弯头657671.831896112131弯头657682.0618108126132弯头657320.544652133弯头65732.50.674652134弯头657330.805058135弯头65733.50.925462136弯头657341.05105868137弯头65734.51.1712.86476138弯头657351.2912.87082139弯头657361.538296140弯头657371.7594108141弯头657381.97104122142弯头808920.816270143弯头80892.51.006272144弯头808931.206878145弯头80893.51.397486146弯头808941.5712.28094147弯头80894.51.7716.888102148弯头808951.9516.896116149弯头808962.3119.2114132150弯头808972.6522128150151弯头808983.0122144170152弯头10010821.23112132153弯头1001082.51.53112134154弯头10010831.85120146155弯头1001083.52.15130154156弯头10010842.4521138166157弯头1001084.52.7423148178第 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序号名称公称通径外径壁厚mm单重单价20#单价304单价316L158弯头10010853.0323158194159弯头10010863.6027.2182222160弯头10010874.1634.6208256161弯头10010884.7134.6230284162弯头100114.321.30122146163弯头100114.32.51.62124146164弯头100114.331.96132158165弯头100114.33.52.28140168166弯头100114.342.5924150180167弯头100114.34.52.9025.4160192168弯头100114.353.2125.4172208169弯头100114.363.8129.6196238170弯头100114.374.4137224274171弯头100114.384.9937248304172弯头12513343.80218260173弯头12513354.7136.4250300174弯头12513365.6142286346175弯头12513376.4950.6322390176弯头12513387.3650.6358444177弯头12513398.3464.4394488178弯头125133109.0564.4438528179弯头1251331210.7084504610180弯头1251331412.10112564712181弯头1251331613.80134652796182弯头125139.744.0041236282183弯头125139.754.9741268322184弯头125139.765.9146308370185弯头125139.776.8556346418186弯头125139.787.7756384476187弯头125139.798.6770422522188弯头125139.7109.5670470568189弯头125139.71211.3088542656190弯头125139.71413.00116608766191弯头125139.71614.60138702856192弯头15015945.49334408193弯头15015956.8250376466194弯头15015968.1456.4428532195弯头15015979.4364.4482602196弯头150159810.7072534668197弯头150159912.0090588752198弯头1501591013.2090658820199弯头1501591215.60108724912200弯头1501591418.001348141054201弯头1501591620.301809361170202弯头150168.345.8154342422203弯头150168.357.2254390484204弯头150168.368.6162442554205弯头150168.379.9970500626206弯头150168.3811.3076554696207弯头150168.3912.7094.4610784208弯头150168.31014.0094.4682856209弯头150168.31216.60114768968210弯头150168.31419.101448641120第 4 页 序号名称公称通径外径壁厚mm单重单价20#单价304单价316L211弯头150168.31621.601929941246212弯头20021949.98604722213弯头200219512.60674834214弯头200219615.10104760948215弯头200219717.501208601072216弯头200219820.001349581198217弯头200219922.3016610541350218弯头2002191024.7016611501474219弯头2002191229.3019613401720220弯头2002191433.9023015521992221弯头2002191638.3026617302224222弯头250273415.6210541236223弯头250273519.8011081376224弯头250273623.6017012441556225弯头250273727.5019213901748226弯头250273831.3021215521952227弯头250273935.0026017102200228弯头2502731038.8026018682406229弯头2502731246.2031421782810230弯头2502731453.5036825503274231弯头2502731660.7042628003628232弯头300325422.3615501902233弯头300325528.3017042122234弯头300325633.9016962112235弯头300325739.4018822384236弯头300325844.9029020722640237弯头300325950.3034624703078238弯头3003251055.7034624943204239弯头3003251266.4041429943872240弯头3003251477.0048433444406241弯头3003251687.4056437924986242弯头350355.6428.5721362668243弯头350355.6536.1021262656244弯头350355.6643.2021202650245弯头350355.6750.3023522988246弯头350355.6857.3040425903312247弯头350355.6964.3046031003998248弯头350355.61071.2046031344034249弯头350355.61284.9054237784888250弯头350355.61498.5064443085640251弯头350355.616112.0076048226324252弯头350377430.3122962858253弯头350377538.4022842846254弯头350377645.9022822844255弯头350377753.4025283200256弯头350377860.9040427743536257弯头350377968.3048433164268258弯头3503771075.7048433564308259弯头3503771290.4056440445218260弯头35037714105.0069046146018261弯头35037716119.0078250926686262弯头400406.4768.9031683978263弯头400406.4875.249636124530第 5 页
弯头重量计算公式
圆环体积=2X3.14X3.14(r^2)R
r--圆环圆半径
R--圆环回转半径
中空管圆环体积=2X3.14X3.14((r^2)-(r'^2))R
r'--圆环内圆半径
90，60，45度的弯头〔肘管〕体积分别是对应中空管圆环体积的1/4、1/6、1/8。
钢的密度工程上计算重量时按7.85公斤/立方分米，密度X体积=重量〔质量〕。
1、180°弯头按表2倍计算，45°按1/2计算； 2、R1.0DN弯头重量按表2/3计算； 3、表中未列出壁厚的重量，可取与之相近的两个重量计算平均值； 4、90°弯头计算公式；
0.0387*S(D-S)R/1000 式中 S=壁厚mm D=外径mm R=弯曲半径mm
90°弯头重量计算公式：W=9.685*10^-6*R(D2-d2)
式中：W — 90°弯头重量，kg；
R — 弯头的曲率半径〔结构尺寸〕，mm；
D — 弯头外径，mm；
d — 弯头内径，mm。
弯头重量公式中采用碳钢比重，即7.85kg/dm3计算。
180°弯头的重量按90°弯头重量的2倍计算。即W=2*9.685*10^-6*R(D2-d2)
提示：10^-6 表 10的-6次方。
法兰成品理论重量算法：
〔外径＊外径－内径＊内径－螺栓孔径＊螺栓孔径＊螺栓孔数〕＊厚度＊０.６１６＊０.００００１＝法兰加工好的成品理论重量．
一般的国内用的法兰对精密度要求不是很高的．用普通车床加工出来的法兰正负会有一点差．和这个法兰的实际重量要差一点．所以我们称之为理论重量．一般国内都是用理论重量来衡量法兰的标准
平焊法兰理论重量表
重量 PN
DN
0.25
0.6
1.0
1.6
2.5 10 0.36 0.36 0.61 0.61 0.61
15 0.41 0.41 0.68 0.68 0.68
20 0.6 0.6 0.94 0.94 0.94
