SMLS PIPE API 5L/ASTM A106 GR.B
YIZENG export SMLS PIPE API 5L/ASTM A106 GR.B to all over the world for many years.
Contact us: info@yzpipefittings.com
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Standard of implementation: API 5L/ASTM A106
Application: used in low-pressure boiler (working pressure is generally greater than 5.88Mpa, working temperature at 450 below) of the heating surface pipe, collecting box and steam pipe
Major steel grade : Grade A,B,C (After consultation, can also provide other special grade of steel pipe)
Chemical composition and mechanical properties :
| Standard |
Steel grade |
Chemical constituents (%) |
| C |
Mn |
Si |
Cr |
Ni |
Cu |
P.S |
| GB3087 |
10 |
0.07～0.14 |
0.35～0.65 |
0.17～0.37 |
≤ 0.15 |
≤ 0.30 |
≤ 0.20 |
≤ 0.030 |
| 20 |
0.17～0.24 |
0.35～0.65 |
0.17～0.37 |
≤ 0.25 |
≤ 0.25 |
≤ 0.20 |
≤ 0.030 |
| Mechanical properties |
Tensile strength (MPa) |
Yield strength (MPa) |
Elongation (%) |
| 10 |
335～475 |
≥ 195 |
≥ 24 |
| 20 |
410～550 |
≥ 245 |
≥ 20 |
Dimensional tolerance:
| Type of steel tube |
Steel tube size
mm
|
Deviation |
| Ordinary grade |
Senior |
| Hot rolling (squeeze) tube |
Outside diameter
D
|
≤159 |
+1.0%(The minimum value is+0.50mm) |
+1.0%(The minimum value is+0.5mm) |
| >159 |
+1.0% |
+1.0% |
|
Wall thickness
S
|
≤20 |
+15%(The minimum value is+0.45mm)
-12.5%(The minimum value is-0.35mm)
|
+1.0%(The minimum value is+0.30mm) |
| >20 |
+12.5% |
+10% |
| D≥351Heat expanding steel tube |
+15% |
| Cold drawing (rolling) tube |
Outside diameter
D
|
10~30 |
+0.40mm |
+0.20mm |
| >30~50 |
+0.45mm |
+0.25mm |
| >50 |
+1.0% |
+0.75% |
|
Wall thickness
S
|
1.5~3.0 |
+15%
-10%
|
+10% |
| >3.0 |
+12.5%
-10%
|
+10% |
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