Low or Medium pressure boiler seamless steel pipe
Standard
GB3087,ASTMA179，ASTMA106GR.B
Business type
Manufacture
Size
OD 12MM-406MM* WT 1.5MM-25MM * Length: SRL, DRL, fixed length
Application。
Applicatio for heating pipelings,containers,steaming pipeline of low/medium pressure boliers（P＜5.88Mpa,T＜450℃）
|
Low Medium high pressure boiler pipe,
1.Usage: high pressure boiler super heater tubes,
reheater tubes, airway the main steam pipes and so on.
2.Kinds: High-pressure,
medium pressure, low pressure, thick-walled, thin-walled, alloy and so on.
3.Grade:20G,20MnG,25MnG,15MoG,20MoG,12Cr1MoVG,
15CrMoVG,12Cr2MoG,12Cr2MoWVTiB,12Cr3MoVSiTiB,
|
|
●Size Tolerances
|
|
Standard
|
OD Tolerance (Common grade)
|
WT Tolerance（Common grade）
|
|
GB3087
Hot roll
|
D≤159mm
|
±1.0%(Min ±0.50mm)
|
S≤20mm
|
+15%-12.5% Min+0.45-0.35mm
|
|
D＞159mm
|
±1%
|
S＞20mm
|
±12.5%
|
|
GB3087
Cold drawn
|
10mm＜D≤30mm
|
±0.40mm
|
|
|
|
30mm＜D≤50mm
|
±0.45mm
|
1.5mm＜S≤3.0mm
|
+15%-10%
|
|
D＞50mm
|
±1%
|
S＞3.0mm
|
+12.5%-10%
|
|
|
|
|
|
|
Standard
|
OD Tolerance (High grade)
|
WT Tolerance（High grade）
|
|
GB3087
Hot roll
|
D≤159mm
|
0.75%(Min ±0.40mm)
|
S≤20mm
|
±10%(Min±0.30mm)
|
|
D＞159mm
|
±0.90%
|
S＞20mm
|
±10%
|
|
GB3087
Cold drawn
|
10mm＜D≤30mm
|
±0.20mm
|
|
|
|
30mm＜D≤50mm
|
±0.25mm
|
1.5mm＜S≤3.0mm
|
±10%
|
|
D＞50mm
|
±0.75%
|
S＞3.0mm
|
±10%
|
|
ASTMA179 OD and WT Tolerance according to SA-450/SA-450M）
|
|
Standard
|
OD Tolerance
|
WT Tolerance
|
|
ASTMA179
|
D＜1〞(25.4mm)
|
±0.10mm
|
S≤11/2〞
|
+20%-0%
|
|
1〞＜D≤11/2〞
|
±0.15mm
|
|
11/2〞＜D≤2〞
|
±0.20mm
|
|
2〞＜D≤21/2〞
|
±0.25mm
|
|
21/2〞＜D≤3〞
|
±0.30mm
|
S＞11/2〞
|
+22%-0%
|
|
3〞＜D≤4〞
|
±0.38mm
|
|
4〞＜D≤71/2〞
|
+0.38-0.64mm
|
|
71/2〞＜D≤9〞
|
+0.38-1.14mm
|
|
|
●Mechanical properties
|
|
Standard
|
Steel
|
Tensile Strength(MPa)
|
Yield strength(MPa)
|
Elongation (%)
|
|
GB3087
|
10
|
335-475
|
195
|
24
|
|
20
|
410-550
|
245
|
20
|
|
ASTM A179
|
SA179
|
320
|
180
|
35
|
|
|
●Chemical composition: (%):
|
|
Standard
|
Steel
|
C
|
Si
|
Mn
|
P≤
|
S≤
|
Cu≤
|
Ni≤
|
Cr≤
|
Mo≤
|
V≤
|
|
GB3087
|
10
|
0.07-0.14
|
0.17-0.37
|
0.35-0.65
|
0.035
|
0.035
|
0.25
|
0.25
|
0.15
|
/
|
/
|
|
20
|
0.17-0.24
|
0.17-0.37
|
0.35-0.65
|
0.035
|
0.035
|
0.25
|
0.25
|
0.25
|
|
|
|
ASTM A179
|
SA179
|
0.06-0.18
|
≤0.25
|
0.27-0.63
|
0.035
|
0.035
|
/
|
/
|
/
|
/
|
/
|
|
.
