專供鍋爐、石化用高壓無縫鋼管
電話:13102008542、022-26926620
專供鍋爐、石化用高壓無縫鋼管
電話:13102008542、022-26926620
SA-210C內螺紋管的尺寸及螺紋參數(shù)允許偏差
|
代號 |
項目 |
“A”型齒型允許偏差 |
“B”型齒型允許偏差 |
|
A |
外徑≤38.1mm
38.1mm＜外徑＜50.8mm
50.8＜外徑＜63.5mm
外徑≥63.5mm |
±0.15mm
±0.20mm
±0.25mm
±0.30mm |
--- |
|
B |
外徑≤38.1mm
38.1mm＜外徑＜50.8mm
50.8＜外徑＜63.5mm
外徑≥63.5mm |
--- |
±0.15mm
±0.20mm
±0.25mm
±0.30mm |
|
C |
螺紋根部內徑：
外徑-（1.11×最小壁厚×2）
外徑≤38.1mm
38.1mm＜外徑＜50.8mm
50.8＜外徑＜63.5mm
外徑≥63.5mm |
±0.15mm
±0.20mm
±0.25mm
±0.30mm |
±0.15mm
±0.20mm
±0.25mm
±0.30mm |
|
E |
最小內徑 |
負偏差為0 |
負偏差為0 |
|
F |
最小壁厚 |
﹢22%
0 |
﹢22%
0 |
|
G |
螺紋頭數(shù) |
--- |
--- |
|
I |
螺紋頂寬（周向）： |
--- |
--- |
|
J |
螺紋高度：
外徑≤38.1mm
38.1mm＜外徑＜50.8mm
50.8＜外徑＜63.5mm
外徑≥63.5mm |
±0.3mm |
±0.18mm
±0.20mm
±0.23mm
±0.28mm |
|
K |
螺紋側邊角度 |
±15° |
±15° |
|
O |
螺紋根部圓角半徑 |
--- |
--- |
|
M |
螺紋節(jié)距 |
±3.2mm |
±3.2mm |
|
N |
螺紋導程 |
±3.2mm×螺紋頭數(shù) |
±3.2mm×螺紋頭數(shù) |
|
Qb |
螺旋升角 |
額定值 |
額定值 |
|
T |
螺紋頂寬（軸向） |
±1.3mm |
±1.3mm |
|
U |
螺紋頂部（軸向）槽寬 |
--- |
--- |
|
a 對“B”型齒型，任何一個螺紋高度的最大偏差可超出表中規(guī)定的允許偏差值，但不應超出允許偏差0.08mm，且所有螺紋的平均高度應符合所給出的偏差范圍。
b 額定值是以管子的軸線為基準。 |
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