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This specification covers steel pipe: electric-fusion welded with metal added, fabricated from pressure-vessel quality plate of any of several analyses and strength levels and suitable for high-pressure service at moderate temperatures. Heat treatment may or may not be required to attain the desired properties or to comply with applicable code requirements. Supplementary requirements are provided for use when additional testing or examination is desired.The specification nominally covers pipe 16 in. (405 mm) in outside diameter or larger with wall thicknesses up to 3 in. (75 mm)
Chemical Requirements
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Specification |
Steel grade |
Chemical composition |
Remarks |
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C |
Si |
Mn |
P |
S |
Ti |
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Pipes for pressure service
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-/A45 |
-/0.17 |
- |
0.98 |
0.035 |
0.035 |
- |
ASTM A672/A672M
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-/A50 |
-/0.22 |
- |
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CA55/A55 |
0.28 |
- |
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-/B55 |
-/0.20 |
0.13 |
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CB60/B60 |
0.24 |
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CB65/B65 |
0.28 |
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CB70/C70 |
0.31 |
1.30 |
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-/C55 |
-/0.18 |
0.55 |
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CC60/C60 |
0.21 |
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CC65/C65 |
0.24 |
0.79 |
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CC70/C70 |
0.27 |
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Mechanical Properties
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Products |
Steel Grade |
BASE METAL MECHANICAL COMPOSITION |
Welding point tensile strength (N/mm2) |
Remarks |
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Yield point (N/mm2) |
Tensile Stregth (N/mm2) |
Test Pieces |
Elongation (%) |
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Pipes for pressure service ASTMASTM A672/A672M
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-/A45 |
-/165 |
-/310~450 |
- |
-/30 |
-/310~450 |
ASTM A672/A672M
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-/A50 |
-/185 |
-/345~485 |
-/28 |
-/345~485 |
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CA55/A55 |
205 |
380~515 |
27 |
380~515 |
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-/B55 |
-/205 |
-/380~515 |
-/27 |
-/380~515 |
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CB60/B60 |
220 |
415~550 |
25 |
415~550 |
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CB65/B65 |
240 |
450~585 |
23 |
450~585 |
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CB70/B70 |
260 |
485~620 |
21 |
485~620 |
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-/C55 |
-/205 |
-/380~515 |
-/27 |
-/380~515 |
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CC60/C60 |
220 |
415~550 |
25 |
415~550 |
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CC65/C65 |
240 |
450~585 |
23 |
450~585 |
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CC70/C70 |
260 |
485~620 |
21 |
485~620 |
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Pipe Grades |
Type of Steel |
ASTM Grades |
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A 45 |
Plain Carbon |
A285 Grade A |
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A 50 |
A285 Grade B |
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A 55 |
A285 Grade C |
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B 55 |
Plain Carbon,Killed |
A515 Grade 55 |
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B 60 |
A515 Grade 60 |
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B 65 |
A515 Grade 65 |
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B 70 |
A515 Grade 70 |
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C 55 |
Plain Carbon,Killed,Fine Grain |
A516 Grade 55 |
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C 60 |
A516 Grade 60 |
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C 65 |
A516 Grade 65 |
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C 70 |
A516 Grade 70 |
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D 70 |
Manganese Silicon-Normalized |
A537 Grade 1 |
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D 80 |
Manganese Silicon-Q&TA |
A537 Grade 2 |
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E 55 |
Plain Carbon |
A442 Grade 55 |
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E 60 |
Plain Carbon |
A442 Grade 60 |
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H 75 |
Manganese-Molybdenum-Normalized |
A302 Grade A |
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H 80 |
A302 Grade B,C or D |
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J 80 |
Manganese-Molybdenum-Q&TA |
A533 Class-1B |
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J 90 |
A533 Class-2B |
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J 100 |
A533 Class-2C |
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K 75 |
Chromium-Manganese-Silicon |
A202 Grade A |
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K 85 |
A202 Grade B |
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L 65 |
Molybdenum |
A204 Grade A |
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L 70 |
A204 Grade B |
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L 75 |
A204 Grade C |
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N 75 |
Manganese-Silicon |
A299 |
