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ICS中華人民共和國(guó)國(guó)家標(biāo)準(zhǔn)GB/T14846—××××鋁及鋁合金擠壓型材尺寸偏差Wrought aluminium and aluminium alloy extruded ondimensions and shape(預(yù)審稿)(本稿完成日期:2005-09-10)××××-××-××發(fā)布 ××××-××-××實(shí)施國(guó)家質(zhì)量技術(shù)監(jiān)督局發(fā)布GB/T14846—××××前 言本標(biāo)準(zhǔn)在GB/T14846-1993《鋁及鋁合金擠壓型材尺寸偏差》的基礎(chǔ)上,參照EN755.9-1998《鋁及鋁合金棒、管、型 2部分:尺寸及外形允許偏差》和ANSIH35.2M-1993《鋁加工產(chǎn)品的尺寸偏差》標(biāo)準(zhǔn)制訂。--本標(biāo)準(zhǔn)將型材分類由原來的ABCD四類劃分為Ⅰ、Ⅱ兩類。--本標(biāo)準(zhǔn)代替GB/T14846-1993本標(biāo)準(zhǔn)由全國(guó)有色金屬標(biāo)準(zhǔn)化技術(shù)委員會(huì)提出。本標(biāo)準(zhǔn)由全國(guó)有色金屬標(biāo)準(zhǔn)化技術(shù)委員會(huì)歸口。(集團(tuán))有限責(zé)任公司。本標(biāo)準(zhǔn)參加起草單位:本標(biāo)準(zhǔn)主要起草人:本標(biāo)準(zhǔn)所代替標(biāo)準(zhǔn)的歷次版本發(fā)布情況為:——GB/T14846-93。IGB/T14846—××××鋁及鋁合金擠壓型材尺寸偏差范圍角度偏差、彎曲度、扭擰度、平面間隙等內(nèi)容。本標(biāo)準(zhǔn)適用于鋁及鋁合金擠壓等截面型材。分類及分級(jí)分類型材按生產(chǎn)的難易程度分類如表1所示。1型材分類表型材類別定義典型合金Ⅰ類(硬合金型材)2XXX7XXX系合金及含鎂量平均值大于或等于3%的5XXX系合金型材2017、2017A、2014、2014A、2024、5A03、5A05、5A06、5154A、5754、5019、5083、5086、7A04、7003、7005、7020、7022、7049A、7075、7178Ⅱ類(軟合金型材)除Ⅰ類外的其他型材1050A、1060、1100、1200、1350、3A21、3003、3103、5A02、50055005A5051A5251505254546A026101A6101B6005、、6351、6060、6061、6261、6063、6063A、6463、6463A、6081、6082表1中未列出的合金,按表中的定義劃分為硬合金或軟合金。分級(jí)2型材分級(jí)表項(xiàng)目可分級(jí)別橫截面厚度尺寸偏差普通級(jí)、高精級(jí)、超高精級(jí)非厚度尺寸偏差普通級(jí)、高精級(jí)、超高精級(jí)角度偏差普通級(jí)、高精級(jí)、超高精級(jí)倒角半徑及圓角半徑偏差不分級(jí)曲面間隙不分級(jí)彎曲度普通級(jí)、高精級(jí)、超高精級(jí)波浪度普通級(jí)、高精級(jí)、超高精級(jí)平面間隙普通級(jí)、高精級(jí)、超高精級(jí)扭擰度普通級(jí)、高精級(jí)、超高精級(jí)切斜度普通級(jí)、高精級(jí)、超高精級(jí)長(zhǎng)度偏差不分級(jí)尺寸及偏差橫截面尺寸及偏差橫截面壁厚尺寸及偏差A(yù)、BA,B1。3要求。1GB/T14846—××××圖1表3橫截面的壁厚尺寸偏差表 單位為毫米級(jí)別公稱壁厚下列外接圓直徑對(duì)應(yīng)各組壁厚的偏差,±≤100>100~300>300~500>500~800Ⅰ類型材Ⅱ類型材Ⅰ類型材Ⅱ類型材Ⅰ類型材Ⅱ類型材Ⅰ類型材Ⅱ類型材A組B組A組B組A組B組A組B組A組B組A組B組A組B組A組B組普通級(jí)≤1.50.300.450.230.300.380.600.300.450.53-0.38----->1.5~30.380.530.230.490.450.750.380.600.681.00.570.900.751.40.601.2>3~60.450.830.300.600.531.00.450.900.901.40.601.20.901.50.751.5>6~100.531.10.380.900.681.50.531.20.981.80.681.51.02.30.831.8>10~150.601.50.451.20.752.00.601.51.02.30.751.81.22.70.902.3>15~200.682.30.531.80.832.70.682.31.13.00.832.61.33.80.983.0>20~300.752.70.602.30.903.30.752.71.23.80.903.01.44.51.03.8>30~400.90-0.68-1.03.80.903.01.44.51.03.31.54.81.24.0>40~50----1.2-1.0-1.5-1.2-1.7-1.4-高精級(jí)≤1.50.200.300.150.200.250.400.200.300.35-0.25----->1.5~30.250.350.150.250.300.500.250.400.450.700.350.600.500.900.400.80>3~60.300.550.200.400.350.700.300.600.600.900.400.800.601.00.501.0>6~100.350.750.250.600.451.00.350.800.651.20.451.00.701.50.551.2>10~150.401.00.300.800.501.30.401.00.701.50.501.20.801.80.601.5>15~200.451.50.351.20.551.80.451.50.752.00.551.70.852.50.652.0>20~300.501.80.401.50.602.20.501.80.802.50.602.00.903.00.702.5>30~400.60-0.45-0.702.50.602.00.903.00.702.21.03.20.802.7>40~50----0.80-0.70-1.0-0.80-1.1-0.90-超高精級(jí)≤1.50.130.200.100.150.150.250.120.200.30-0.25----->1.5~30.130.230.100.170.150.300.120.250.300.300.250.280.360.380.300.33>3~60.150.300.120.220.180.400.150.340.320.550.270.500.380.600.320.55>6~100.170.430.140.350.200.570.170.460.350.800.290.670.411.00.340.80>10~150.200.570.170.460.230.740.190.570.361.10.300.880.431.30.361.1>15~200.200.850.170.680.231.00.190.850.361.50.301.20.431.80.361.4>20~300.221.00.180.850.251.20.211.00.381.90.321.50.462.20.381.8>30~400.25-0.21-0.301.50.251.20.402.20.331.60.482.30.402.0>40~50----0.36-0.30-0.50-0.42-0.60-0.50-2GB/T14846—××××3由雙方協(xié)商。橫截面非壁厚尺寸及偏差橫截面的非壁厚尺寸可分為實(shí)體尺寸和非100%實(shí)體的空心尺寸(H)H的偏差由其對(duì)應(yīng)的基準(zhǔn)尺寸E2~144~9圖2 圖3圖4 圖5圖6 圖7圖8 圖93GB/T14846—××××圖10 圖11圖12 圖1314第Ⅰ類型材的非壁厚尺寸偏差應(yīng)符合表4中普通級(jí)的規(guī)定,需要表5中的高精級(jí)、表6壁厚尺寸,其尺寸偏差不檢查。第Ⅱ類型材的非壁厚尺寸偏差應(yīng)符合表7中普通級(jí)的規(guī)定,需要表8中的高精級(jí)、表9壁厚尺寸,其尺寸偏差不檢查。4~9OTX510,OTX510偏差應(yīng)由雙方另行協(xié)商。4GB/T14846—××××表4第Ⅰ類型材的普通級(jí)非壁厚尺寸偏差表 單位為毫米外接圓直徑公稱尺寸與下列基準(zhǔn)尺寸E對(duì)應(yīng)的空心尺寸H的偏差(±)≤20>20~30>30~40>40~60>60~80>80~100>100~125>125~150>150~180>180~210>210~250>250≤100≤100.600.600.830.981.21.31.5------>10~250,750,750.981.11.41.51.7------>25~501.21.21.41.51.71.82.0------>50~1001.51.51.71.82.02.12.3------>100~200≤100.750.750.981.11.41.51.72.02.32.6--->10~251.01.01.271.41.51.71.82.12.42.7--->25~501.41.41.51.71.82.02.12.42.73.0--->50~1001.81.82.02.12.32.42.62.93.23.5---2.22.22.42.62.72.93.03.33.63.9---2.82.83.03.13.33.53.63.94.24.5--->200~300≤100.800.801.01.21.41.51.72.02.32.62.853.23.5>10~251.21.21.41.51.71.82.02.32.62.93.153.53.8>25~501.51.51.71.82.02.12.32.62.93.23.53.84.0>50~1002.02.02.12.32.42.62.73.33.33.63.94.24.52.62.62.72.93.03.13.33.63.94.24.54.85.13.33.33.53.63.83.94.04.44.75.05.35.65.93.83.83.94.04.24.44.54.85.15.45.76.06.3>300~600≤100.900.901.11.31.51.71.82.12.42.73.03.33.6>10~251.41.41.51.71.82.02.12.42.73.03.33.63.9>25~501.81.82.02.12.32.42.62.93.23.53.84.04.4>50~1002.42.42.62.72.93.03.23.53.84.04.44.75.02.72.72.93.03.23.33.53.84.04.44.75.05.33.63.63.83.94.04.24.44.75.05.35.65.96.24.24.24.34.54.74.85.05.35.65.96.26.56.85.25.25.45.65.75.96.06.36.66.97.27.57.86.86.86.97.07.27.47.57.88.18.48.79.09.3>600~800≤101.01.01.31.41.71.82.02.32.62.93.23.53.8>10~251.71.71.82.02.12.32.42.73.03.33.63.94.2>25~502.02.02.12.32.42.62.73.33.33.63.94.24.5>50~1002.72.72.93.03.13.33.53.84.04.44.75.05.33.03.03.13.33.53.63.84.04.44.75.05.35.64.04.04.24.44.54.74.85.15.45.76.06.36.64.74.74.85.05.15.35.45.76.06.36.66.97.25.75.75.96.06.16.36.56.87.07.47.78.08.37.57.57.77.88.08.18.38.68.88.99.29.59.89.09.09.19.39.59.69.810.010.310.711.011.311.65GB/T14846—××××表5第Ⅰ類型材的高精級(jí)非壁厚尺寸偏差表 單位為毫米外接圓直徑差(±)與下列基準(zhǔn)尺寸E對(duì)應(yīng)的空心尺寸H的偏差(±)≤20>20~30>30~40>40~60>60~80>80~100>100~125>125~150>150~180>180~210>210~250>250≤100≤100.400.400.550.650.800.901.0------>10~250.500.500.650.750.901.01.1------>25~500.800.800.951.01.11.21.3------>50~1001.01.01.11.21.31.41.5------>100~200≤100.500.500.650.750.901.01.11.31.51.7--->10~250.700.700.850.951.01.11.21.41.61.8--->25~500.900.901.01.11.21.31.41.61.82.0--->50~1001.21.21.31.41.51.61.71.92.12.3---1.51.51.61.71.81.92.02.22.42.6---1.91.92.02.12.22.32.42.62.83.0--->200~300≤100.550.550.700.800.951.01.11.31.51.71.92.12.3>10~250.800.800.951.01.11.21.31.51.71.92.12.32.5>25~501.01.01.11.21.31.41.51.71.92.12.32.52.7>50~1001.31.31.41.51.61.71.82.02.22.42.62.83.01.71.71.81.92.02.12.22.42.62.83.03.23.42.22.22.32.42.52.62.72.93.13.33.53.73.92.52.52.62.72.82.93.03.23.43.63.84.04.2>300~600≤100.600.600.750.851.01.11.21.41.61.82.02.22.4>10~250.900.901.01.11.21.31.41.61.82.02.22.42.6>25~501.21.21.31.41.51.61.71.92.12.32.52.72.9>50~1001.61.61.71.81.92.02.12.32.52.72.93.13.31.81.81.92.02.12.22.32.52.72.93.13.33.52.42.42.52.62.72.82.93.13.33.53.73.94.12.82.82.93.03.13.23.33.53.73.94.14.34.53.53.53.63.73.83.94.04.24.44.64.85.05.24.54.54.64.74.84.95.05.25.45.65.86.06.2>600~800≤100.700.700.850.951.11.21.31.51.71.92.12.32.5>10~251.11.11.21.31.41.51.61.82.02.22.42.62.8>25~501.31.31.41.51.61.71.82.02.22.42.62.83.0>50~1001.81.81.92.02.12.22.32.52.72.93.13.33.52.02.02.12.22.32.42.52.72.93.13.33.53.72.72.72.82.93.03.13.23.43.63.84.04.24.43.13.13.23.33.43.53.63.84.04.24.44.64.83.83.83.94.04.14.24.34.54.74.95.15.35.55.05.05.15.25.35.45.55.75.95.96.16.36.56.06.06.16.26.36.46.56.76.97.17.37.57.76GB/T14846—××××表6第Ⅰ類型材的超高精級(jí)非壁厚尺寸偏差表 單位為毫米外接圓直徑差(±)與下列基準(zhǔn)尺寸E對(duì)應(yīng)的空心尺寸H的偏差(±)≤20>20~30>30~40>40~60>60~80>80~100>100~125>125~150>150~180>180~210>210~250>250≤100≤100.220.220.370.470.620.720.82------>10~250.240.240.390.490.640.740.84------>25~500.400.400.550.650.800.901.0------>50~1000.700.700.850.951.11.21.3------>100~200≤100.270.270.420.520.670.770.871.11.31.5--->10~250.330.330.480.580.730.830.931.21.41.6--->25~500.450.450.600.700.850.951.11.31.51.7--->50~1000.830.830.981.11.21.31.41.61.82.0---1.21.21.31.41.61.71.82.02.22.4---1.51.51.41.51.92.02.12.32.52.7--->200~300≤100.300.300.450.550.700.800.901.11.31.51.71.92.1>10~250.380.380.530.630.780.880.981.21.41.61.82.02.2>25~500.500.500.650.750.901.01.11.31.51.71.92.12.3>50~1000.900.901.01.11.31.41.51.71.92.12.32.52.71.31.31.41.51.71.81.92.12.32.52.72.93.11.71.71.81.92.12.22.32.52.72.93.13.33.52.02.02.12.22.42.52.62.83.03.23.43.63.8>300~600≤100.510.510.660.760.911.01.11.31.51.71.92.12.3>10~250.560.560.710.810.961.11.21.41.61.82.02.22.4>25~500.830.830.981.11.21.31.41.61.82.02.22.42.6>50~1001.11.11.21.31.51.61.71.92.12.32.52.72.91.51.51.61.71.92.02.12.32.52.72.93.13.31.81.81.92.02.22.32.42.62.83.03.23.43.62.52.52.62.72.93.03.13.33.53.73.94.14.34.54.54.64.74.95.05.15.35.55.75.96.16.34.64.64.74.85.05.15.25.45.65.86.06.26.4>600~800≤100.600.600.750.851.01.11.21.41.61.82.02.22.4>10~250.680.680.830.931.11.21.31.51.71.92.12.32.5>25~500.900.901.01.11.31.41.51.71.92.12.32.52.7>50~1001.31.31.41.51.71.81.92.12.32.52.72.93.11.71.71.81.92.12.22.32.52.72.93.13.33.52.02.02.12.22.42.52.62.83.03.23.43.63.82.82.82.93.03.23.33.43.63.84.04.24.44.64.04.04.14.24.44.54.64.85.05.25.45.65.85.15.15.25.35.55.65.75.96.16.36.56.76.95.55.55.65.75.96.06.16.36.56.76.97.17.37GB/T14846—××××表7第Ⅱ類型材的普通級(jí)非壁厚尺寸偏差表 單位為毫米外接圓直徑差(±)與下列基準(zhǔn)尺寸E對(duì)應(yīng)的空心尺寸H的偏差(±)≤20>20~30>30~40>40~60>60~80>80~100>100~125>125~150>150~180>180~210>210~250>250≤100≤100.380.380.600.750.981.11.3------>10~250.450.450.680.831.11.21.4------>25~500.750.750.981.11.41.51.7------>50~1001.01.01.31.41.71.82.0------>100~200≤100.450.450.680.831.11.21.41.72.02.3--->10~250.600.600.830.981.21.41.51.82.12.4--->25~500.900.901.131.31.51.71.82.12.42.7--->50~1001.41.41.51.72.02.12.32.62.93.1---1.71.71.72.02.32.32.62.93.13.5---2.02.02.12.32.62.72.93.13.53.8--->200~300≤100.530.530.750.901.11.31.41.72.02.32.62.93.1>10~250.750.750.981.11.41.51.72.02.32.62.93.13.5>25~501.21.21.41.51.82.02.12.42.73.03.33.63.9>50~1001.71.71.82.02.32.42.62.93.13.53.84.04.42.02.02.12.32.62.92.93.13.53.84.04.44.72.32.32.42.62.93.03.13.53.84.04.44.75.02.62.62.72.93.13.33.43.84.04.44.75.05.3>300~600≤100.600.600.830.981.21.41.51.82.12.42.73.03.5>10~250.900.901.11.31.51.71.82.12.42.73.03.33.6>25~501.41.41.51.72.02.12.32.62.93.13.53.84.0>50~1002.02.02.12.32.62.72.93.13.53.84.04.44.72.32.32.42.62.93.33.13.53.84.04.44.75.02.72.72.93.03.33.53.63.94.24.54.85.15.43.23.23.33.43.83.94.04.34.75.05.35.65.94.24.24.44.54.85.05.15.45.76.06.36.66.95.75.75.96.06.36.66.66.97.27.52.88.18.4>600~800≤100.750.750.981.11.41.51.72.02.32.62.93.13.5>10~251.11.11.31.41.71.82.02.32.62.93.13.53.8>25~501.51.51.72.02.32.32.62.73.03.33.63.94.2>50~1002.32.32.42.62.93.03.13.53.84.04.44.75.02.62.62.72.93.13.33.53.84.04.44.75.05.33.03.03.23.33.63.83.94.24.54.85.15.45.73.63.63.63.94.24.44.54.85.15.45.76.06.34.54.54.75.05.15.35.45.76.06.36.66.97.26.36.36.56.86.97.07.27.57.88.18.48.79.07.57.57.78.08.18.28.48.79.09.39.69.910.08GB/T14846—××××表8第Ⅱ類型材的高精級(jí)非壁厚尺寸偏差表 單位為毫米外接圓直徑差(±)與下列基準(zhǔn)尺寸E對(duì)應(yīng)的空心尺寸H的偏差(±)≤20>20~30>30~40>40~60>60~80>80~100>100~125>125~150>150~180>180~210>210~250>250≤100≤100.250.250.400.500.650.750.85------>10~250.300.300.450.550.700.800.90------>25~500.500.500.650.750.901.01.1------>50~1000.700.700.850.951.11.21.3------>100~200≤100.300.300.450.550.700.800.901.11.31.5--->10~250.400.400.550.650.800.901.01.21.41.6--->25~500.600.600.750.851.01.11.21.41.61.8--->50~1000.900.901.01.11.31.41.51.71.92.1---1.11.11.11.31.51.51.71.92.12.3---1.31.31.41.51.71.81.92.12.32.5--->200~300≤100.350.350.500.600.750.850.951.11.31.51.71.92.1>10~250.500.500.650.750.901.01.11.31.51.71.92.12.3>25~500.800.800.951.01.21.31.41.61.82.02.22.42.6>50~1001.11.11.21.31.51.61.71.92.12.32.52.72.91.31.31.41.51.71.91.92.12.32.52.72.93.11.51.51.61.71.92.02.12.32.52.72.93.13.31.71.71.81.92.12.22.32.52.72.93.13.33.5>300~600≤100.400.400.550.650.800.901.01.21.41.61.82.02.3>10~250.600.600.750.851.01.11.21.41.61.82.02.22.4>25~500.900.901.01.11.31.41.51.71.92.12.32.52.7>50~1001.31.31.41.51.71.81.92.12.32.52.72.93.11.51.51.61.71.92.02.12.32.52.72.93.13.31.81.81.92.02.22.32.42.62.83.03.23.43.62.12.12.22.32.52.62.72.93.13.33.53.73.92.82.82.93.03.23.33.43.63.84.04.24.44.63.83.83.94.04.24.44.44.64.85.05.25.45.6>600~800≤100.500.500.650.750.951.01.11.31.51.71.92.12.3>10~250.700.700.850.951.11.21.31.51.71.92.12.32.5>25~501.01.01.11.31.51.51.71.82.02.22.42.62.8>50~1001.51.51.61.71.92.02.12.32.52.72.93.13.31.71.71.81.92.12.22.32.52.72.93.13.33.52.02.02.12.22.42.52.62.83.03.23.43.63.82.42.42.42.62.82.93.03.23.43.63.84.04.23.03.03.13.33.43.53.63.84.04.24.44.64.84.24.24.34.54.64.74.85.05.25.45.65.86.05.05.05.15.35.45.55.65.86.06.26.46.66.89GB/T14846—××××表9第Ⅱ類型材的超高精級(jí)非壁厚尺寸偏差表 單位為毫米外接圓直徑差(±)與下列基準(zhǔn)尺寸E對(duì)應(yīng)的空心尺寸H的偏差(±)≤20>20~30>30~40>40~60>60~80>80~100>100~125>125~150>150~180>180~210>210~250>250≤100≤100.150.150.300.400.550.650.85------>10~250.170.170.320.420.570.670.87------>25~500.230.230.380.480.630.730.93------>50~1000.380.380.530.630.780.881.1------>100~200≤100.180.180.330.430.580.680.881.01.21.4--->10~250.200.200.350.450.600.700.901.11.31.5--->25~500.300.300.450.550.700.801.01.21.41.6--->50~1000.500.500.650.750.901.01.21.41.61.8---0.730.730.880.981.11.21.41.61.82.0---0.950.951.11.21.31.41.61.82.02.2--->200~300≤100.200.200.350.450.600.700.901.11.31.51.71.92.1>10~250.250.250.400.500.650.750.951.21.41.61.82.02.2>25~500.360.360.510.610.760.861.11.31.51.71.92.12.3>50~1000.600.600.750.851.01.11.31.51.71.92.12.32.50.860.861.01.11.31.41.61.82.02.22.42.62.81.11.11.31.41.51.61.82.02.22.42.62.83.01.41.41.51.61.81.92.12.32.52.72.93.13.3>300~600≤100.320.320.470.570.720.821.01.21.41.61.82.02.2>10~250.400.400.550.650.800.901.11.31.51.71.92.12.3>25~500.540.540.690.790.941.11.31.51.71.92.12.32.5>50~1000.750.750.901.01.21.31.51.71.92.12.32.52.70.970.971.11.21.41.51.71.92.12.32.52.72.91.31.31.51.61.71.82.02.22.42.62.83.03.21.71.71.81.92.12.22.42.62.83.03.23.43.62.52.52.32.42.93.03.23.43.63.84.04.24.43.13.13.23.33.53.63.84.04.24.44.64.85.0>600~800≤100.400.400.550.650.800.901.11.31.51.71.92.12.3>10~250.460.460.600.700.860.961.21.41.61.82.02.22.4>25~500.600.600.750.851.01.11.31.51.71.92.12.32.5>50~1000.860.861.01.11.31.41.61.81.82.02.22.42.61.11.11.31.41.51.61.82.02.22.42.62.83.01.41.41.61.71.81.92.12.32.52.72.93.13.31.91.92.12.22.32.42.62.83.03.23.43.63.82.72.72.93.03.33.43.63.84.04.24.44.64.83.43.43.63.74.04.14.34.54.74.95.15.35.54.04.04.24.34.64.74.95.15.35.55.75.96.110橫截面角度及偏差

GB/T14846—××××型材橫截面的角度及偏差應(yīng)符合表10應(yīng)將角度偏差標(biāo)注在圖紙上。圖紙上未標(biāo)注偏差且不能直接測(cè)量的角度,其偏差不要求。10橫截面的角度及允許偏差表型材類別普通級(jí)高精級(jí)超高級(jí)Ⅰ±3°±2°±1°Ⅱ±2°±1°±0.5°倒角半徑及圓角半徑偏差rR15。15值標(biāo)注在圖樣上。圖樣上未標(biāo)注倒角半徑r表11 橫截面倒角半徑r的允許偏差表 單位為毫米壁厚下列各類型材的倒角半徑r,不大于第Ⅰ類型材第Ⅱ類型材≤30.60.5>3~60.80.6>6~101.00.8>10~501.01.0值標(biāo)注在圖樣上。圖樣上未標(biāo)注圓角半徑R表12橫截面圓角半徑R的允許偏差表 單位為毫米公稱圓角半徑R圓角半徑的允許偏差,±≤50.5>510%R曲面間隙161313型材要求曲面間隙時(shí),應(yīng)雙方協(xié)商曲面弧樣板。無曲面弧樣板或不能直接測(cè)量的曲面弧,不檢驗(yàn)型材的曲面間隙允許偏差。11GB/T14846—××××16型材的曲面間隙表 單位為毫米曲面弦長(zhǎng)型材的曲面間隙值,不大于≤250.30>25~600.30>60~900

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