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This guide covers standard specifications for minimum-wall-thickness, seamless carbon steel boiler and superheater tubes for high-pressure service. The steel shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, and silicon. The tubes shall have a hardness number not exceeding a specific value. The following mechanical tests shall be conducted, namely: flattening test; flaring test; hardness test; and hydrostatic test.
Chemistry composition
|
C, %
|
Mn, %
|
Si, %
|
P, %
|
S, %
|
|
0.06-0.18
|
0.27-0.63
|
0.25 max
|
0.035 max
|
0.035 max
|
|
Tensile Strength , MPa
|
Yield Strength , MPa
|
Elongation, %
|
Hardness, HB, WT≥5.1mm
|
Hardness, HRB, WT＜5.1mm
|
|
325 min
|
180 min
|
35 min
|
137 max
|
77 max
|
|
Hot rolled
|
Outside Diameter, mm
|
Tolerance, mm
|
|
OD≤101.6
|
+0.4/-0.8
|
|
|
101.6＜OD≤177.8
|
+0.4/-1.2
|
|
|
Cold Drawn
|
Outside Diameter, mm
|
Tolerance, mm
|
|
OD＜25.4
|
±0.10
|
|
|
25.4≤OD≤38.1
|
±0.15
|
|
|
38.1＜OD＜50.8
|
±0.20
|
|
|
50.8≤OD＜63.5
|
±0.25
|
|
|
63.5≤OD＜76.2
|
±0.30
|
|
|
76.2≤OD≤101.6
|
±0.38
|
|
|
101.6＜OD≤177.8
|
+0.38/-0.64
|
|
|
Hot rolled
|
Outside Diameter, mm
|
Tolerance, %
|
|
OD≤101.6, WT≤2.4 |
+40/-0
|
|
|
OD≤101.6, 2.4＜WT≤3.8
|
+35/-0
|
|
|
OD≤101.6, 3.8＜WT≤4.6
|
+33/-0
|
|
|
OD≤101.6, WT>4.6
|
+28/-0
|
|
|
OD>101.6, 2.4＜WT≤3.8
|
+35/-0
|
|
|
OD>101.6, 3.8＜WT≤4.6
|
+33/-0
|
|
|
OD>101.6, WT>4.6
|
+28/-0
|
|
|
Cold Drawn
|
Outside Diameter, mm
|
Tolerance, %
|
|
OD≤38.1
|
+20/-0
|
|
|
OD>38.1
|
+22/-0
|
Read more: What are seamless boiler tubes and how are they made?
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