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Low or Medium Pressure Boiler Pipe/High Pressure Pipe |
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GB3087,ASTMA179, ASTMA106GR.B |
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Business type |
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Manufacture |
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●Size |
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OD 12MM-406MM* WT 1.5MM-25MM * Length: SRL, DRL, fixed length |
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●Application. |
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Applicatio for heating pipelings,containers,steaming pipeline of low/medium pressure boliers(P＜5.88Mpa,T＜450℃) |
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●Size Tolerances |
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Standard |
OD Tolerance (Common grade) |
WT Tolerance(Common grade) |
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GB3087 |
D≤159mm |
±1.0%(Min ±0.50mm) |
S≤20mm |
+15%-12.5% Min+0.45-0.35mm |
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Hot roll |
D＞159mm |
±1% |
S＞20mm |
±12.5% |
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GB3087 |
10mm＜D≤30mm |
±0.40mm |
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30mm＜D≤50mm |
±0.45mm |
1.5mm＜S≤3.0mm |
0.05 |
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Cold drawn |
D＞50mm |
±1% |
S＞3.0mm |
0.025 |
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Standard |
OD Tolerance (High grade) |
WT Tolerance(High grade) |
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GB3087 |
D≤159mm |
0.75%(Min ±0.40mm) |
S≤20mm |
±10% (Min±0.30mm) |
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Hot roll |
D＞159mm |
±0.90% |
S＞20mm |
±10% |
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GB3087 |
10mm＜D≤30mm |
±0.20mm |
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30mm＜D≤50mm |
±0.25mm |
1.5mm＜S≤3.0mm |
±10% |
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Cold drawn |
D＞50mm |
±0.75% |
S＞3.0mm |
±10% |
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ASTMA179 OD and WT Tolerance according to SA-450/SA-450M) |
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Standard |
OD Tolerance |
WT Tolerance |
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ASTMA179 |
D＜1〞(25.4mm) |
±0.10mm |
S≤11/2〞 |
0.2 |
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1〞＜D≤11/2〞 |
±0.15mm |
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11/2〞＜D≤2〞 |
±0.20mm |
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2〞＜D≤21/2〞 |
±0.25mm |
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21/2〞＜D≤3〞 |
±0.30mm |
S＞11/2〞 |
0.22 |
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3〞＜D≤4〞 |
±0.38mm |
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4〞＜D≤71/2〞 |
+0.38-0.64mm |
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71/2〞＜D≤9〞 |
+0.38-1.14mm |
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●Mechanical properties |
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Standard |
Steel |
Tensile Strength(MPa) |
Yield strength(MPa) |
Elongation (%) |
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GB3087 |
10 |
335-475 |
195 |
24 |
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20 |
410-550 |
245 |
20 |
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ASTM A179 |
SA179 |
320 |
180 |
35 |
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●Chemical composition: (%): |
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Standard |
Steel |
C |
Si |
Mn |
P≤ |
S≤ |
Cu≤ |
Ni≤ |
Cr≤ |
Mo≤ |
V≤ |
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GB3087 |
10 |
0.07-0.14 |
0.17-0.37 |
0.35-0.65 |
0.035 |
0.035 |
0.25 |
0.25 |
0.15 |
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20 |
0.17-0.24 |
0.17-0.37 |
0.35-0.65 |
0.035 |
0.035 |
0.25 |
0.25 |
0.25 |
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ASTM A179 |
SA179 |
0.06-0.18 |
≤0.25 |
0.27-0.63 |
0.035 |
0.035 |
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