標(biāo)準(zhǔn) | 外徑(mm) | 壁厚(mm) | 長度(mm) | |||
范圍 | 偏差 | 范圍 | 偏差 | 范圍 | 偏差 | |
ASTM A312 | [10.29,48.26] | +0.40/-0.80 | [10.29,73.03] | +20%/-12.5% | L ≦ 7.3m | +6/-0 |
(48.26,114.30] | +0.80/-0.80 | [88.9 , 457.2] ( t/D ≦ 5% ) | +22.5%/-12.5% | |||
(114.30,219.08] | +1.60/-0.80 | [88.9 , 457.2] ( t/D > 5% ) | +15%/-12.5% | |||
(219.08,457.20] | +2.40/-0.80 | D ≧ 508 ( t/D ≦ 5% ) | +22.5%/-12.5% | |||
薄壁管( t/D ≦ 3% )橢圓度條件:鋼管任一截面 D 大 -D 小≦ 1.5%D 公稱,并且該截面大與小直徑的平均值( D 大 +D ?。?/2 符合規(guī)定直徑的公差范圍 | D ≧ 508 ( t/D > 5% ) | +15%/-12.5% | ||||
外徑≦ NPS12 的鋼管的重量偏差: +10%/-3.5% ;外徑> NPS12 的鋼管的重量偏差: +10%/-5% | ||||||
ASTM A213 | D < 25.4 | +0.10/-0.10 | D ≦ 38.1 | +20%/-0 | D < 50.8 ; L ≦ 7.3m | +3/-0 |
〔25.4,38.1] | +0.15/-0.15 | |||||
(38.1,50.8) | +0.20/-0.20 | |||||
[50.8,63.5) | +0.25/-0.25 | D > 38.1 | +22%/-0 | D ≧ 50.8 ; L ≦ 7.3m | +5/-0 | |
[63.5,76.2) | +0.30/-0.30 | |||||
[76.2 101.6] | +0.38/-0.38 | |||||
(101.6,190.5] | +0.38/-0.64 | |||||
(190.5,228.6] | +0.38/-1.14 | |||||
薄壁管橢圓度條件:薄壁管任一截面大與小直徑的平均值須符合規(guī)定直徑的公差范圍,并且橢圓度(任一截面外徑讀數(shù)差)應(yīng)不超過下列允許值: D ≦ 25.4 ,允許值為 0.5mm;D > 25.4 ,允許值為規(guī)定外徑的 2% 注:薄壁管定義: D ≦ 50.8 , t ≦ 2%D ; D > 50.8 , t ≦ 3%D ;, t ≦ 0.5mm:不銹鋼管的尺寸偏差 | 對于外徑≧ 50.8mm 和壁厚≧ 5.6mm 的鋼管,任一截面的壁厚偏差不得超過該截面平均壁厚的 10% | 如 L > 7.3m; 每增加 3 米或其剩余部分,允許增加 3mm 正公差,大為 12.7mm | ||||
ASTM A269 | D < 12.7 | +0.13/-0.13 | 薄壁管定義 : | ±15% | L ≦ 7.3m | +3.2/-0 |
[12.7,38.1) | +0.13/-0.13 | t < 1.65mm | ±10% | |||
[38.1,88.9) | +0.25/-0.25 | t < 2.41mm | ±10% | L ≦ 7.3m | +4.8/-0 | |
[88.9,139.7) | +0.38/-0.38 | t < 3.81mm | ±10% | |||
[139.7,203.2) | +0.76/-0.76 | t < 3.81mm | ±10% | |||
薄壁管橢圓度條件:薄壁管任一截面的外徑與公稱直徑偏差為上表中規(guī)定偏差的 2 倍,并且薄壁管任一截面大與小直徑的平均值須符合規(guī)定直徑的公差范圍 | 如 L > 7.3m; 每增加 3 米或其剩余部分,允許增加 3mm 正公差,大為 12.7mm | |||||
ASTMA511 表三 | a | 壁厚為下列值時 ( 薄壁管 ) ,雙倍外徑公差 | q | |||
D < 12.7 | +0.13/-0.13 | t < 0.38mm | ±15% | L ≦ 7.3m | +3.2/-0 | |
[12.7,38.1) | +0.13/-0.13 | t < 1.65mm | ±10% | |||
[38.1,88.9) | +0.25/-0.25 | t < 2.41mm | L ≦ 7.3m | +4.8/-0 | ||
[88.9,139.7) | +0.38/-0.38 | t < 3.81mm | ||||
[139.7,203.2) | +0.76/-0.76 | t < 6.09mm | ||||
[203.2,219.08) | +1.14/-1.14 | t < 7.62mm | ||||
[219.08,323.85] | +1.57/-1.57 | t < 8.89mm | ||||
薄壁管橢圓度條件:薄壁管任一截面的外徑與公稱直徑偏差為上表中規(guī)定偏差的 2 倍,并且薄壁管任一截面大與小直徑的平均值須符合規(guī)定直徑的公差范圍 | 如 L > 7.3m; 每增加 3 米或其剩余部分,允許增加 3mm 正公差,大為 12.7mm |