结构用冷弯型钢

GB/T6728-20251结构用冷弯型钢1范围本文件规定了结构用冷弯型钢（以下简称型钢）的订货内容、分类、代号、技术要求、检验规则、包装、标志、运输、贮存及质量证明书，描述了相应的试验方法。本文件适用于冷轧或热轧钢板和钢带在连续辊式冷弯机组上生产的通用冷弯开口型钢（以下简称开口型钢）、圆形、矩形和方形冷弯闭口型钢（以下简称闭口型钢），也适用于连续热浸镀锌型钢（以下简称为镀锌型钢）。本文件不适用于采用镀锌钢板及钢带冷弯并焊接成型的型钢。2规范性引用文件下列文件的内容通过文中的规范性引用而构成本文件必不可少的条款。其中，注日期的引用文件，仅该日期对应的版本适用于本文件；不注日期的引用文件，其最新版本（包括所有的修改单）适用于本文件。GB/T222钢及合金成品化学成分允许偏差GB/T228.1金属材料拉伸试验第1部分：室温试验方法GB/T229金属材料夏比摆锤冲击试验方法GB/T470-2008锌锭GB/T699优质碳素结构钢GB/T700碳素结构钢GB/T709热轧钢板和钢带的尺寸、外形、重量及允许偏差GB/T714桥梁用结构钢GB/T1591低合金高强度结构钢GB/T2101型钢验收、包装、标志及质量证明书的一般规定GB/T2102钢管的验收、包装、标志和质量证明书GB/T2975钢及钢产品力学性能试验取样位置及试样制备GB/T3280不锈钢冷轧钢板和钢带GB/T4171耐候结构钢GB/T8170数值修约规则与极限数值的表示和判定GB/T20066钢和铁化学成分测定用试样的取样和制样方法GB/T20878不锈钢牌号及化学成分GB/T33162冷弯型钢用热连轧钢板及钢带3术语和定义下列术语和定义适用于本文件。3.1自由边freeedge开口型钢中，只有一端存在圆弧角（R角）的边。GB/T6728-202523.2非自由边non-freeedge开口型钢中，两端均存在圆弧角（R角）的边。4订货内容按本文件订货的合同或订单包括下列内容：a）本文件编号；b）产品名称；c）钢的牌号；d）交货重量；e）尺寸与外形；f）特殊要求。5分类、代号5.1闭口型钢按外形形状分为方形、矩形、圆形，其代号分别为：a）方形型钢（也可简称为方管）:F；b）矩形型钢（也可简称为矩管）:J；c）圆形型钢（也可简称为圆管）:Y（或ø)；5.2开口型钢按其截面形状分为9种，其代号分别为：a）冷弯等边角钢：JD；b）冷弯不等边角钢：JB；c）冷弯等边槽钢：CD；d）冷弯不等边槽钢：CB；e）冷弯内卷边槽钢：CN；f）冷弯外卷边槽钢：CW；g）冷弯Z形钢：Z；h）冷弯卷边Z形钢：ZJ；i）冷弯卷边等边角钢：JJ。6技术要求6.1截面、尺寸及允许偏差6.1.1闭口型钢方形型钢的截面图见图1，截面尺寸、允许偏差、理论重量、截面面积及截面特性应符合表1的规定。截面面积、截面特性参数及每米长度的表面积仅供参考。矩形型钢的截面图见图2，截面尺寸、允许偏差、理论重量、截面面积及截面特性应符合表2的规定。截面面积、截面特性参数及每米长度的表面积仅供参考。圆形型钢的截面图见图3，截面尺寸、允许偏差、理论重量、截面面积及截面特性应符合表3的规定。截面面积、截面特性参数及每米长度的表面积仅供参考。闭口型钢的截面特性可参照附录A计算。经供需双方协商并在合同中注明，可提供表1、GB/T6728-20253表2、表3规定以外尺寸及允许偏差的型钢。闭口型钢壁厚的允许偏差应符合附录B的规定。标引符号说明：B-边长；t-壁厚；R-外圆弧半径；r-内圆弧半径；图1方形型钢标引符号说明：H-长边边长；B1-短边边长；t-壁厚；R—外圆弧半径；r-内圆弧半径；图2矩形型钢GB/T6728-20254标引符号说明：D-外径；t-壁厚；图3圆形型钢表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性GB/T6728-202553cmGB/T6728-202553cm边长mm尺寸允许偏差mm壁厚mm单位长度的理论重量kg/m截面面积惯性矩cm4惯性半径cm弹性截面模数3cm扭转常数cm4扭转模数cm3公称外圆弧半径mm公称内圆弧半径mm每米长度的表面积mB±△tMAIrWIC1RrAs20±0.501.20.6790.8650.5070.7660.5070.8230.7532.401.20758791.50.8261.0520.6050.7580.6050.9850.8843.001.50748491.70.9181.1700.6680.7550.6681.0830.9613.401.70741622.01.0501.3370.7620.7550.7621.2151.0604.002.007313225±0.501.20.8681.1051.0340.9670.8281.6611.2362.401.20958791.51.0611.3521.2390.9570.9912.0081.4713.001.50948491.71.1851.5101.3680.9521.0942.2251.6123.401.70941622.01.3641.7371.5530.9461.2432.5261.8044.002.009313230±0.501.51.2971.6522.2181.1591.4793.5682.2073.001.501148491.71.4521.8502.4541.1521.6363.9702.4333.401.701141621.81.5281.9472.5691.1491.7134.1652.5413.601.801138192.01.6782.1372.7921.1431.8614.5402.7474.002.001131322.21.8232.3223.0091.1382.0064.8982.9384.402.201124452.52.0322.5893.3271.1342.2185.4013.2025.002.501114152.752.2002.8033.5901.1322.3945.7903.3995.502.751105573.02.3613.0083.8581.1332.5726.1503.5776.003.0010969940±0.501.51.7682.2525.5121.5652.7568.7464.1283.001.501548491.71.9862.5306.1281.5563.0649.7824.5843.401.701541621.82.0942.6676.4281.5523.21410.2884.8043.601.801538192.02.3062.9377.0101.5453.50511.2775.2304.002.001531326表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）边长mm尺寸允许偏差mm壁厚mm单位长度的理论重量kg/m截面面积cm2惯性矩cm4惯性半径cm弹性截面模数cm3扭转常数cm4扭转模数c公称外圆弧半径mm公称内圆弧半径mm每米长度的表面积mm2/mB±△tMAIrWItC1RrAs40±0.502.22.5133.2027.5731.5383.78712.2355.6374.402.201524452.52.8173.5898.3861.5294.19313.6146.2105.002.501514152.753.0643.9039.0401.5224.52014.7096.6565.502.751505573.03.3034.2089.6781.5164.83915.7557.0746.003.001496993.53.7644.79510.9301.5105.46517.6977.8287.003.501479823.753.9845.07511.5571.5095.77918.5938.1667.503.751471234.04.1985.34812.1941.5106.09719.4388.4798.004.0014626550±0.501.52.2392.85211.0881.9724.43517.4176.6493.001.501948491.72.5203.21012.3691.9634.94819.5377.4143.401.701941621.82.6593.38712.9951.9595.19820.5787.7873.601.801938192.02.9343.73714.2171.9505.68722.6268.5134.002.001931322.23.2044.08215.4021.9436.16124.6259.2134.402.201924452.53.6024.58917.1151.9316.84627.53210.2165.002.501914152.753.9275.00318.4891.9227.39629.87211.0095.502.751905573.04.2455.40819.8211.9147.92932.13511.7656.003.001896993.54.8636.19522.3841.9018.95436.43113.1687.003.501879823.755.1626.57523.6281.8969.45138.46313.8167.503.7518712345.4546.94824.8561.8919.94240.41814.4318.004.001862654.56.0207.66927.2961.88710.91844.09415.5609.004.501845484.756.2938.01628.5251.88611.41045.81516.0769.504.75183690GB/T6728-2025表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）GB/T6728-20257GB/T6728-20257边长mm尺寸允许偏差mm壁厚mm单位长度的理论重量kg/m截面面积c惯性矩cm4惯性半径cm弹性截面模数3cm扭转常数cm4扭转模数cm3公称外圆弧半径mm公称内圆弧半径mm每米长度的表面积mB±△tMAIrWIC1RrAs60±0.602.03.5624.53725.2122.3578.40439.78612.5944.002.002331322.23.8954.96227.3742.3499.12543.38613.6684.402.202324452.54.3875.58930.5132.33710.17148.65615.2195.002.502314152.754.7916.10333.0392.32711.01352.92816.4595.502.752305573.05.1876.60835.4892.31711.83057.09117.6526.003.002296993.55.9627.59540.1902.30013.39765.08819.9017.003.502279823.756.3398.07542.4542.29314.15168.92120.9597.503.752271234.06.7108.54844.6712.28614.89072.64421.9738.004.002262654.57.4339.46948.9942.27516.33179.75723.8759.004.502245484.757.7849.91651.1182.27017.03983.14624.7649.504.752236905.08.13010.35653.2282.26717.74386.42425.61210.005.0022283170±0.652.55.1726.58949.5812.74314.16678.48521.2225.002.502714152.755.6547.20353.7882.73315.36885.52823.0085.502.752705573.06.1297.80857.8812.72316.53792.42324.7386.003.002696993.57.0618.99565.7482.70418.785105.76828.0317.003.502679823.757.5179.57569.5372.69519.868112.21729.5977.503.752671234.07.96610.14873.2402.68620.926118.51731.1108.004.002662654.58.84611.26980.4212.67122.978130.66733.9819.004.502645484.759.27611.81683.9172.66523.976136.51635.3409.504.752636905.09.70012.35687.3632.65924.961142.21336.65110.005.002628318表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）边长mm尺寸允许偏差mm壁厚mm单位长度的理论重量kg/m截面面积cm2惯性矩cm4惯性半径cm弹性截面模数cm3扭转常数cm4扭转模数c公称外圆弧半径mm公称内圆弧半径mm每米长度的表面积mm2/mB±tMAIrWItC1RrAs75±0.652.55.5657.08961.5532.94716.41497.13324.5985.002.502914153.06.6008.40871.9732.92619.193114.54328.7306.003.002896994.08.59410.94891.3072.88824.349147.32136.2778.004.002862655.010.48513.356109.0592.85829.083177.35442.91610.005.0028283180±0.702.55.9577.58975.3183.15018.830118.52028.2245.002.503114152.756.5188.30381.8383.14020.460129.32230.6565.502.753105573.07.0719.00888.1973.12922.049139.93133.0226.003.003096993.58.16010.395100.4583.10925.115160.57137.5597.003.503079823.758.69411.075106.3763.09926.594170.60139.7327.503.753071234.09.22211.748112.1633.09028.041180.43641.8438.004.003062654.510.25913.069123.3783.07330.844199.52245.8819.004.503045484.7510.76713.716128.8243.06532.206208.77247.8109.504.753036905.011.27014.356134.1763.05733.544217.82649.68010.005.003028315.512.25515.611144.6363.04436.159235.34453.24911.005.503011145.7512.73716.226149.7673.03837.442243.80754.94811.505.753002566.013.21416.830149.242.98037.31252.07056.59012.006.0029939890±0.753.08.01310.208127.6373.53628.364201.41542.5066.003.003496994.010.47813.348163.0403.49536.231260.80154.1738.004.003462655.012.84016.356195.6673.45943.481316.26064.70510.005.003428316.015.09819.233226.1463.42950.255367.76274.15912.006.00339398GB/T6728-2025表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）GB/T6728-202502cmGB/T6728-202502cm边长mm尺寸允许偏差mm壁厚mm单位长度的理论重量kg/m截面面积惯性矩cm4惯性半径cm弹性截面模数cm3扭转常数cm4扭转模数cm3公称外圆弧半径mm公称内圆弧半径mm每米长度的表面积mB±△tMAIrWIC1RrAs90±0.758.018.87324.040255.0703.26056.680455.59088.83020.0012.00325663100±0.803.510.35813.195202.9363.92240.587320.94560.8107.003.503879823.7511.04914.075215.3243.91143.065341.62964.4977.503.753871234.011.73414.948227.4713.90145.494362.01268.1018.004.003862654.513.08516.669251.0793.88150.216401.87175.0709.004.503845484.7513.75017.516262.5583.87252.512421.34678.4369.504.753836905.014.41018.356273.8363.86254.767440.51781.72410.005.003828315.515.70920.011295.8273.84559.165477.94788.07111.005.503811145.7516.34820.826306.5633.83761.313496.20591.13211.505.753802566.016.98221.633317.1433.82963.429514.15694.11912.006.003793988.021.38527.240366.4303.67073.290644.510114.23020.0012.0036566310.025.56532.570412.2603.56082.450749.840130.10025.0015.00357079110±0.904.012.99016.548307.0564.30855.828486.46983.6288.004.004262655.015.98020.356370.6834.26767.397593.596100.74110.005.004228316.018.86624.033430.2364.23178.225694.854116.47212.006.004193988.023.89730.440506.1204.08092.020878.700142.82020.0012.0040566310.028.70536.570575.9803.970104.721032.26164.33025.0015.00397079120±0.903.512.55615.995358.8234.73659.804563.01189.6587.003.504679823.7513.40417.075381.2984.72563.550600.00895.2577.503.754671234.014.24618.148403.3964.71567.233636.572100.7548.004.004662650表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）边长mm尺寸允许偏差mm壁厚mm单位长度的理论重量kg/m截面面积cm2惯性矩cm4惯性半径cm弹性截面模数cm3扭转常数cm4扭转模数c公称外圆弧半径mm公称内圆弧半径mm每米长度的表面积mm2/mB±△tMAIrWItC1RrAs120±0.904.515.91120.269446.4974.69474.416708.403111.4509.004.504645484.7516.73321.316467.5214.68377.920743.667116.6519.504.754636905.017.55022.356488.2084.67381.368778.497121.75510.005.004628315.519.16324.411528.6194.65388.103846.850131.67511.005.504611145.7519.95925.426548.3674.64491.394880.372136.49411.505.754602566.020.75026.433567.8264.63594.638913.456141.21912.006.004593987.524.97831.819679.2644.620113.2111104.351166.68518.7511.254478097.7525.69732.735698.3554.619116.3931133.907170.68119.3811.634467368.026.40933.642717.4844.618119.5811162.951174.58420.0012.0044566310.031.84540.570777.9904.380129.6601376.410202.52025.0015.00437079130±1.004.015.50219.748518.0895.12279.706814.722119.4798.004.005062655.019.12024.356628.4115.07996.679998.220144.76610.005.005028316.022.63428.833732.3125.040112.6631173.562168.36312.006.004993986.223.06529.383746.5185.041114.8491211.925172.33515.509.304933898.028.92136.842923.4625.007142.0711502.067209.54020.0012.0048566310.034.98544.5701022.2804.790157.2701788.290244.70025.0015.00477079140±1.103.514.75418.795579.3185.55282.760903.567124.1047.003.505479823.7515.75920.075616.2975.54188.042963.735132.0147.503.755471234.016.75821.348652.7365.53093.2481023.317139.8048.004.005462654.518.73723.869724.0315.508103.4331140.718155.0259.004.50544548GB/T6728-2025表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）GB/T6728-20251GB/T6728-20251边长mm尺寸允许偏差mm壁厚mm单位长度的理论重量kg/m截面面积c惯性矩cm4惯性半径cm弹性截面模数5cm3扭转常数cm4扭转模数cm3公称外圆弧半径mm公称内圆弧半径mm每米长度的表面积mB±△tMAIrWIC1RrAs140±1.104.7519.71625.116758.9115.497108.4161198.536162.4599.504.755436905.020.69026.356793.2935.486113.3281255.765169.77710.005.005428315.522.61728.811860.6145.465122.9451368.452184.06711.005.505411145.7523.57030.026893.5785.455127.6541423.908191.04211.505.755402566.024.51831.233926.0955.445132.2991478.772197.90412.006.005393987.529.68837.8191106.2585.408158.0371800.718235.79718.7511.255278097.7530.56438.9351136.8855.404162.4121851.117241.79719.3811.635267368.031.43340.0421167.3815.399166.7691900.844247.68620.0012.00525663150±1.203.515.85320.195717.2955.96095.6391116.029143.4267.003.505879823.7516.93721.575763.4325.948101.7911190.730152.6427.503.755871234.018.01422.948808.9375.937107.8581264.758161.7288.004.005862654.520.15025.669898.0935.915119.7461410.794179.5119.004.505845484.7521.20827.016941.7665.904125.5691482.801188.2129.504.755836905.022.26028.356984.8525.893131.3141554.132196.78610.005.005828315.524.34431.0111069.3125.872142.5751694.764213.56011.005.505811145.7525.37632.3261110.7115.862148.0951764.064221.76211.505.755802566.026.40233.6331151.5745.851153.5431832.685229.84312.006.005793987.532.04340.8191376.4315.807183.5242237.541274.84318.7511.255678097.7532.99842.0351414.5495.801188.6062301.192281.99519.3811.635667368.033.94543.2421452.4415.796193.6592364.083289.02520.0012.005656632表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）边长mm尺寸允许偏差mm壁厚mm单位长度的理论重量kg/m截面面积cm2惯性矩cm4惯性半径cm弹性截面模数cm3扭转常数cm4扭转模数c公称外圆弧半径mm公称内圆弧半径mm每米长度的表面积mm2/mB±△tMAIrWI1C1RrAs150±1.2010.041.26552.5701653.7105.610220.4902839.240340.98025.0015.0055707912.047.14760.0601784.8405.450237.9803230.570380.01036.0024.00538194160±1.203.516.95221.595875.6236.368109.4531359.415164.1487.003.506279823.7518.11423.075932.3236.356116.5401450.812174.7707.503.756271234.019.27024.548988.2926.345123.5361541.446185.2518.004.006262654.521.56327.4691098.0836.323137.2601720.417205.7979.004.506245484.7522.69928.9161151.9296.312143.9911808.752215.8639.504.756236905.023.83030.3561205.0906.301150.6361896.321225.79410.005.006228315.526.07133.2111309.4116.279163.6762069.151245.25211.005.506211145.7527.18134.6261360.5966.268170.0742154.412254.78111.505.756202567.534.39843.8191688.3896.207211.0492739.456316.88418.7511.256078097.7535.43145.1351735.2796.201216.9102818.446325.28619.3811.636067368.036.45746.4421781.8436.194222.7302896.583333.55820.0012.0060566310.044.40556.5702048.8506.020256.1103490.290395.10025.0015.0059707912.050.91564.8602229.4305.860278.6803996.720443.13036.0024.00578194170±1.304.020.52626.1481192.4016.753140.2821855.779210.3748.004.006662655.025.40032.3561456.0066.708171.2952285.331256.80110.005.006628316.030.17038.4331707.2226.665200.8502701.023300.91312.006.006593988.038.96949.6422158.7856.594253.9753503.142381.28520.0012.0064566310.047.54560.5702502.2706.430294.3804233.070453.21025.0015.00637079GB/T6728-2025表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）GB/T6728-2025510mGB/T6728-2025510m边长mm尺寸允许偏差mm壁厚mm单位长度的理论重量kg/m截面面积惯性矩cm4惯性半径cm弹性截面模数cm3扭转常数cm4扭转模数cm3公称外圆弧半径mm公称内圆弧半径mm每米长度的表面积mB±△tMAIrWI1C1RrAs170±1.3012.054.68369.6602741.9706.270322.5804872.550511.03036.0024.00618194180±1.403.519.15024.3951258.9377.184139.8821947.353209.7917.003.507079823.7520.46926.0751341.3747.172149.0422079.239223.5247.503.757071234.021.78227.7481422.8647.161158.0962210.159237.0978.004.007062654.524.38931.0691583.0527.138175.8952469.098263.7669.004.507045484.7525.68232.7161661.7757.127184.6422597.116276.8649.504.757036905.026.97034.3561739.6007.116193.2892724.164289.80710.005.007028315.529.52537.6111892.6097.094210.2902975.35315.23111.005.507011145.7530.79239.2261967.8217.083218.6473099.485327.71411.505.757002566.032.05440.8332042.1907.072226.9103222.648340.04612.006.006993987.539.10849.8192449.6577.012272.1843956.561409.95418.7511.256878097.7540.29851.3352518.3397.004279.8154073.090421.15519.3811.636867368.041.48152.8422586.4696.996287.3854188.562432.20720.0012.0068566310.050.68564.5703017.9806.840335.3305073.570515.31025.0015.0067707912.058.45174.4603327.2606.680369.7005865.260583.71036.0024.00658194190±1.504.023.03829.3481681.2817.569176.9772606.984265.4198.004.007462655.028.54036.3562057.8727.524216.6183215.819324.81310.005.007428316.033.93843.2332418.4557.479254.5743807.375381.57812.006.007393988.043.99356.0423068.0957.399322.9574957.642486.32520.0012.0072566310.053.82568.5703599.9707.250378.9406017.790581.40025.0015.007170791表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）边长mm尺寸允许偏差mm壁厚mm单位长度的理论重量kg/m截面面积cm2惯性矩cm4惯性半径cm弹性截面模数cm3扭转常数cm4扭转模数c公称外圆弧半径mm公称内圆弧半径mm每米长度的表面积mm2/mB±△tMAIrWI1C1RrAs190±1.5012.062.21979.2603990.1007.100420.0106982.040661.17036.0024.00698194200±1.603.521.34827.1951740.4608.000174.0462684.182261.0347.003.507879823.7522.82429.0751855.4507.988185.5452867.014278.2787.503.757871234.024.29430.9481969.2527.977196.9253048.656295.3418.004.007862654.527.21534.6692193.3387.954219.3343408.363328.9339.004.507845484.7528.66536.5162303.6497.943230.3653586.426345.4639.504.757836905.030.11038.3562412.8227.931241.2823763.295361.81810.005.007828315.532.97942.0112627.8107.909262.7814113.446394.00711.005.507811145.7534.40343.8262733.6537.898273.3654286.726409,84311.505.757802566.035.82245.6332838.4177.887283.8424458.807425.50812.006.007793987.543.81855.8193414.0627.821341.4065488.032515.01118.7511.257678097.7545.16557.5353510.8657.812351.0865652.247529.41019.3811.637667368.046.50559.2423606.8617.803360.6865815.182543.64020.0012.007656639.554.39469.2914167.9357.756416.7946765.513625.50923.7514.257592259.7555.68370.9334259.3197.749425.9326919.292638.57624.3814.6375815210.056.96572.5664350.2027.743435.0207071.735651.48025.0015.0075707912.065.98784.0604735.2907.510473.5308230.100743.42036.0024.00738194220±1.805.033.25042.3563240.7568.747294.6145037.714441.82710.005.008628316.039.59050.4333819.0298.702347.1845976.181520.56712.006.008593988.051.52965.6424868.6188.612442.6027814.839667.86120.0012.00845663GB/T6728-2025表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）GB/T6728-20255GB/T6728-20255边长mm尺寸允许偏差mm壁厚mm单位长度的理论重量kg/m截面面积cm2惯性矩cm4惯性半径cm弹性截面模数cm3扭转常数cm4扭转模数cm3公称外圆弧半径mm公称内圆弧半径mm每米长度的表面积mB±△tMAIrWI1C1RrAs220±1.8010.063.24580.5665881.5978.544534.6919532.773803.62225.0015.0083707912.073.52393.6596879.8638.571625.44211148.806922.27936.0024.00818194240±1.905.036.39046.3564239.4039.563353.2846571.421529.83510.005.009428316.043.35855.2335003.2279.518416.9367803.569625.22212.006.009393988.056.55372.0426397.3409.423533.11210225.933804.87320.0012.0092566310.069.52588.5667742.1259.350645.17712504.687971.74325.0015.0091707912.081.059103.2599023.4919.348751.95814678.9631120.29436.0024.00898194250±2.004.534.28043.6694361.8159.994348.9456732.075523.3469.004.509845484.7536.12346.0164585.7069.983366.8567088.471550.2059.504.759836905.037.96048.3564807.7439.971384.6197443.007576.83810.005.009828315.541.61453.0115246.3209.948419.7068146.491629.43611.005.509811145.7543.43155.3265462.8909.937437.0318495.438655.40211.505.759802566.045.24257.6335677.6719.925454.2148842.518681.14912.006.009793987.555.59370.8196871.3009.850549.70410928.305830.11718.7511.259678097.7557.33373.0357071.3399.840565.70711264.004854.25519.3811.639667368.059.06575.2427269.8139.829581.58511597.769878.17620.0012.009656639.569.30988.2918429.8889.771674.39113559.2561017.17023.7514.259592259.7570.99090.4338618.4759.762689.47813879.2401039.58924.3814.6395815210.072.66592.5668805.8149.753704.46514197.221061.79725.0015.0095707911.581.667104.0349880.7199.746790.45816090.5851185.85434.5023.009407695表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）边长mm尺寸允许偏差mm壁厚mm单位长度的理论重量kg/m截面面积cm2惯性矩cm4惯性半径cm弹性截面模数cm3扭转常数cm4扭转模数c公称外圆弧半径mm公称内圆弧半径mm每米长度的表面积mm2/mB±tMAIrWI1C1RrAs250±2.0011.7583.251106.05210066.6339.743805.33116392.1271206.28135.2523.5093948212.084.827108.05910252.4299.741820.19416691.3311226.48836.0024.00938194260±2.105.039.53050.3565424.76210.379417.2898388.415625.84110.005.0010228316.047.12660.0336410.21110.333493.0939969.771739.47512.006.0010193988.061.57778.4428218.62610.236632.20213086.864954.67720.0012.00100566310.075.80596.5669963.78610.158766.44516035.4721155.84725.0015.0099707912.088.595112.85911592.51710.135891.73218878.1571337.47536.0024.00978194280±2.204.538.51949.0696175.65311.219441.1189503.251661.5929.004.5011045484.7540.59751.7166495.42411.207463.95910009.139695,8479.504.7511036905.042.67054.3566812.83311.195486.63110512.697729.84710.005.0011028315.546.79559.6117440.63211.172531.47411512.813797.08911.005.5011011145.7548.84762.2267751.05411.161553.64712009.369830.33211.505.7511002566.050.89464.8338059.18111.149575.65612503.588863.32712.006.0010993987.562.65879.8199783.05511.071698.79015477.5611055.16418.7511.2510878097.7564.63382.33510071.62011.060719.40115957.9921086.34319.3811.6310867368.066.60184.84210358.07811.049739.86316436.0321117.27520.0012.0010856639.578.25899.69112034.74610.987859.62519253.5271297.72623.7514.2510792259.7580.175102.13312307.55410.977879.11119714.5621326.95224.3814.63107815210.082.085104.56612578.57910.968898.47020173.1301355.93825.0015.00107707911.592.500117.83414098.35710.9381007.02522927.5231520.06934.5023.001060769GB/T6728-2025表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）GB/T6728-2025110mGB/T6728-2025110m边长mm尺寸允许偏差mm壁厚mm单位长度的理论重量kg/m截面面积惯性矩cm4惯性半径cm弹性截面模数cm3扭转常数cm4扭转模数cm3公称外圆弧半径mm公称内圆弧半径mm每米长度的表面积mB±△tMAIrWI1C1RrAs280±2.2011.7594.319120.15214362.19510.9331025.87123367.1611547.07335.2523.50105948212.096.131122.45914625.34310.9281044.66723803.9791573.82836.0024.001058194300±2.405.550.24964.0119199.84211.988613.32314206.400919.85611.005.5011811145.7552.45866.8269585.92211.977639.06114821.449958.45111.505.7511802566.054.66269.6339969.33711.965664.62215433.819996.77712.006.0011793987.567.36885.81912123.14611.885808.21019120.8521220.19018.7511.2511678097.7569.50088.53512483.47211.874832.23119717.7051256.56319.3811.6311667368.071.62591.24212841.29511.863856.08620311.8361292.66920.0012.0011656639.584.224107.29114937.85411.799995.85723818.8831503.75123.7514.2511592259.7586.298109.93315279.26711.7891018.61824393.6721538.01424.3814.63115815210.088.365112.56615618.50511.7791041.23424965.6571572.01725.0015.00115707911.599.722127.03417505.80811.7391167.05428414.5191765.85534.5023.00114076911.75101.698129.55217833.64311.7331188.91028965.8551797.74135.2523.50113948212.0103.667132.05918160.36711.7271210.69129514.0241829.35936.0024.001138194320±2.506.058.43074.43312159.87812.782759.99218789.2641139.82512.006.0012593988.076.64997.64215693.87612.678980.86724752.6751480.85920.0012.00124566310.094.645120.56619115.56412.5921194.72330461.0551804.08725.0015.00123707912.0111.203141.65922235.9912.5291389.74936065.8872104.07136.0024.001218194350±2.805.558.88475.01114763.37714.029843.62222705.6711265.2711.005.5013811145.7561.48678.32615390.24814.017879.44323696.0101318.99311.505.7513802560表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）边长mm尺寸允许偏差mm壁厚mm单位长度的理论重量kg/m截面面积cm2惯性矩cm4惯性半径cm弹性截面模数cm3扭转常数cm4扭转模数c公称外圆弧半径mm公称内圆弧半径mm每米长度的表面积mm2/mB±△tMAIrWI1C1RrAs350±2.806.064.08281.63316013.41414.006915.05224682.7091372.39712.006.0013793987.579.143100.81919544.59913.9231116.83430628.1711685.24318.7511.2513678097.7581.668104.03520134.76313.9121150.55831594.5961736.34819.3811.6313667368.084.185107.24220721.30813.9001184.07532557.3761787.13720.0012.0013656639.599.139126.29124166.83513.8331380.96238256.8832085.28423.7514.2513592259.75101.605129.43324729.19613.8221413.09739193.8272133.88624.3814.63135815210.0104.065132.56625288.27713.8121445.04440127.0312182.17925.0015.00135707911.5117.777150.03428377.69513.7531621.58345786.1192460.75234.5023.00134076911.75120.146153.05228913.51913.7451652.20146694.1582506.58935.2523.50133948212.0122.507156.05929447.04813.7361682.68847598.0832552.10936.0024.001338194400±3.207.590.918115.81929510.65915.9621475.53346012.7602225.28418.7511.2515678097.7593.835119.53530412.71315.9511520.63647475.9242293.61919.3811.6315667368.096.745123.24231309.85215.9391565.49348934.3892361.58920.0012.0015656639.5114.054145.29136591.83115.8701829.59257585.7522761.78523.7514.2515592259.75116.913148.93337455.76115.8591872.78859010.9482827.22324.3814.63155815210.0119.765152.56638315.12815.8471915.75660431.3362892.30225.0015.00155707911.5135.832173.03443071.37915.7772153.56969067.8503270.58234.5023.00154076911.75138.593176.55243893.76215.7682194.68870458.2483332.86335.2523.50153948212.0141.347180.05944712.47315.7582235.62471843.4653394.77936.0024.00153819413.5157.697200.88849553.09215.7062477.65580044.3463758.64540.5027.001530468GB/T6728-2025表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）GB/T6728-2025510mGB/T6728-2025510m边长mm尺寸允许偏差mm壁厚mm单位长度的理论重量kg/m截面面积惯性矩cm4惯性半径cm弹性截面模数cm3扭转常数cm4扭转模数cm3公称外圆弧半径mm公称内圆弧半径mm每米长度的表面积mB±△tMAIrWI1C1RrAs400±3.2013.75160.393204.32350348.86915.6982517.44381392.4903818.02241.2527.50152918114.0163.082207.74851141.78715.6902557.08982735.2233877.03942.0028.001527893450±3.607.5102.693130.81942396.32618.0021884.28165837.1192840.31518.7511.2517678097.75106.003135.03543704.82117.9901942.43667942.9402928.38119.3811.6317667368.0109.305139.24245006.92717.9792000.30870042.8743016.03020.0012.0017656639.5128.969164.29152687.84117.9082341.68282517.9873533.26523.7514.2517592259.75132.220168.43353946.46217.8962397.62184576.2823618.03624.3814.63175815210.0135.465172.56655199.05817.8852453.29186628.5683702.40025.0015.00175707911.5153.887196.03462161.86017.8072762.74999122.1924195.36434.5023.00174076911.75157.041200.05263361.87117.7972816.083101139.3544276.58635.2523.50173948212.0160.187204.05964556.64117.7872869.184103150.1464357.39436.0024.00173819413.5178.892227.88871620.73617.7283183.144115079.344833.58240.5027.00173046813.75181.981231.82372781.62617.7193234.739117044.6454911.50941.2527.50172918114.0185.062235.74873938.09717.7103286.138119003.3244989.02642.0028.001727893500±4.007.5114.468145.8195857620.0432343.06490663.7463530.34118.7511.2519678097.75118.170150.5356039820.0312415.94393576.8923640.63519.3811.6319667368.0121.865155.2426221220.0192488.50196482.8283750.46320.0012.0019656639.5143.884183.2917292919.9472917.195113766.0864399.73023.7514.2519592259.75147.528187.9337468819.9352987.552116621.0784506.33324.3814.63195815210.0151.165192.5667644019.9243057.603119468.7244612.47925.0015.0019570790表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）边长mm尺寸允许偏差mm壁厚mm单位长度的理论重量kg/m截面面积cm2惯性矩cm4惯性半径cm弹性截面模数cm3扭转常数cm4扭转模数cm3公称外圆弧半径mm公称内圆弧半径mm每米长度的表面积mm2/mB±△tMAIrWI1C1RrAs500±4.0011.5171.942219.0348622419.8413448.966136811.6355235.11334.5023.00194076911.75175.488223.5528790519.8303516.214139618.7135337.77235.2523.50193948212.0179.027228.0598957919.8193583.182142418.1135439.96936.0024.00193819413.5200.087254.8889948319.7563979.334159051.2906043.45740.5027.00193046813.75203.568259.32310111119.7464044.455161795.9486142.42941.2527.50192918114.0207.042263.74810273319.7364109.330164532.6446240.94342.0028.00192789315.5227.712290.07811234119.6794493.653180783.6006822.43646.5031.00192016715.75231.128294.43111392319.6704556.931183463.5566917.75847.2531.50191888016.0234.536298.77211549919.6624619.999186135.2637012.62748.0032.00191759218.0261.5103336905117.654207207.6487755.30954.0036.00190729120.0287.963366.83214012619.6105605.051227731.6128469.25560.0040.00189699025.0351.8174484206799.385247688.8719154.71275.0050.001871238600±5.0016.0284.776362.77220403023.8506801.028326005.33910328.63748.0032.00231759218.0318.0304057707545.229363707.46811457.37954.0036.00230729120.0350.763446.83224816823.6908272.282400659.28612551.15060.0040.00229699024.0414.667528.23829056523.5409685.529472224.27014634.87372.0048.00227638825.0430.31754850010032.458475273.43714553.67375.0050.002271238700±6.0016.0335.016426.77232938827.9309411.095512021.60613958.99448.0032.00271759218.0374.5547785010456.602570986.22215476.51254.0036.00270729120.0413.563526.83240175227.77011478.635644046.03517432.54960.0040.002696990GB/T6728-2025表1方形型钢截面尺寸、允许偏差、理论重量、截面面积及截面特性（续）GB/T6728-202522cmGB/T6728-202522cm边长mm尺寸允许偏差mm壁厚mm单位长度的理论重量kg/m截面面积惯性矩cm4惯性半径cm弹性截面模数cm3扭转常数cm4扭转模数cm3公称外圆弧半径mm公称内圆弧半径mm每米长度的表面积mB±△tMAIrWI1C1RrAs700±6.0024.0490.027624.23847115227.61013461.507761569.16420416.87172.