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ASTM A106 Seamless Pressure Pipe (also known as ASME SA106 pipe) is commonly used in the construction of oil and gas refineries, power plants, petrochemical plants, boilers, and ships where the piping must transport fluids and gasses that exhibit higher temperatures and pressure levels.
This specification covers seamless carbon steel pipe for high-temperature service
Sizes (Seamless): 1/2" NB - 60" NB
Sizes (ERW): 1/2" NB - 24" NB
Sizes (SAW): 16" NB - 100" NB |
Wall Thickness available:
Schedule 20 - Schedule XXS (heavier on request) up to 250 mm thk.
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 Material Grades
| High Temperature Seamless Pipe |
ASTM A106 Gr. B/C, API 5L Gr. B, ASTM A53 Gr. B |
| Heat Exchanger Seamless Tube |
ASTM A179 |
| Low Temperature Seamless Pipe |
ASTM A333 Gr. 3/6 |
| Low Temperature Seamless Tube |
ASTM A334 Gr. 6 |
| High Yield Seamless Pipe |
API 5L Gr. X42/X46/X52/X56/X60/X65/X70/X80 PSL-1/PSL-2 |
| High Yield Seamless Pipe |
ISO 3183 Gr.L245, L290, L320, L360, L390, L415, L450, L485 |
| Atmospheric & Low Temp EFW Pipes |
ASTM A671 Gr. CC60/CC65/CC70 |
| High Pressure & Moderate Temp EFW Pipes |
ASTM A672 Gr. B60/B65/B70/C55/C60/C65/C70 |
| High Yield ERW/SAW Pipe |
API 5L Gr. X42/X46/X52/X56/X60/X65/X70/X80 PSL-1/PSL-2 |
| High Yield ERW/SAW Pipe |
ISO 3183 Gr.L245, L290, L320, L360, L390, L415, L450, L485 |
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Additional Testing :
NACE MR0175, NACE TM0177, NACE TM0284, HIC TEST, SSC TEST, H2 SERVICE, IBR, etc.
Dimensions :
All Pipe is manufactured and inspected/tested to the relevant standards including ASTM, ASME, API.
Chemical Composition ASTM A106 Carbon Steel Pipes Grades
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Grade A |
Grade B |
Grade C |
Total of Cr, Cu, Mo, Ni, and V shall not exceed 1% |
| Carbon max. % |
0.25 |
0.30 |
0.35 |
| Manganese % |
0.27 to 0.93 |
0.29 to 1.06 |
0.29 to 1.06 |
| Phosphorous, max. % |
0.035 |
0.035 |
0.035 |
| Sulfur, max. % |
0.035 |
0.035 |
0.035 |
| Silicon, min.% |
0.10 |
0.10 |
0.10 |
| Chrome, max. % |
0.40 |
0.40 |
0.40 |
| Copper, max. % |
0.40 |
0.40 |
0.40 |
| Molybdenum, max. % |
0.15 |
0.15 |
0.15 |
| Nickel, max. % |
0.40 |
0.40 |
0.40 |
| Vanadium, min.% |
0.08 |
0.08 |
0.08 |
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Permissible Variations in Wall Thickness
The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified.
Permissible Variations in
Weights per Foot
Weight of any length shall not vary more than 10% over and 3.5% under that specified.
NOTE -- NPS 4 and smaller -- weighed in lots. Larger sizes shall be weighed separately by length.
Permissible Variations in Outside Diameter
Outside Diameter at any point shall not vary from standard specified more than: |
| NPS [DN Designator] |
Over |
Under |
| in. |
mm |
in. |
mm |
| 1/8 to 1-1/2 [6 to 40], incl |
1/64 (0.015) |
0.4 |
1/64 (0.015) |
0.4 |
| Over 1-1/2 to 4 [40 to 100], incl |
1/32 (0.031) |
0.8 |
1/32 (0.031) |
0.8 |
| Over 4 to 8 [100 to 200], incl |
1/16 (0.062) |
1.6 |
1/32 (0.031) |
0.8 |
| Over 8 to 18 [200 to 450], incl |
3/32 (0.093) |
2.4 |
1/32 (0.031) |
0.8 |
| Over 18 to 26 [450 to 650], incl |
1/8 (0.125) |
3.2 |
1/32 (0.031) |
0.8 |
Over 26 to 34 [650 to 859], incl
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5/32 (0.156) |
4.0 |
1/32 (0.031) |
0.8 |
| Over 34 to 48 [850 to 1200], incl |
3/16 (0.187) |
4.8 |
1/32 (0.031) |
0.8 |
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Tensile Requirements
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Seamless |
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Grade A |
Grade B |
Grade C |
| Tensile Strength, min., psi |
48,000 |
60,000 |
00 |
| Yield Strength, min., psi |
30,000 |
35,000 |
40,000 |
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Number of Tests Required
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NPS |
On One Length from Each Lot of |
| Tensile |
5 and smaller |
400 or less |
| 6 and larger |
200 or less |
| Bending |
2 and smaller |
400 or less |
| Flattening |
2 through 5 |
400 or less |
| 6 and over |
200 or less |
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Hydrostatic Testing
Inspection test pressures produce a stress in the pipe wall equal to 60% of specified minimum yield strength (SMYS) at room temperature. Maximum Pressures are not to exceed 2500 psi for NPS3 and under 2800 psi for the larger sizes. Pressure is maintained for not less than 5 seconds. |
Mechanical Tests Specified
Tensile Test -- NPS 8 and larger -- either transverse or longitudinal acceptable
Smaller than NPS 8 -- weighed in lots. Larger sizes -- by length.
Flattening Test -- NPS 2-1/2 and larger.
Bending Test (Cold) -- NPS 2 and under. |
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Degree of Bend |
Diameter of Mandrel |
| For Normal A106 Uses |
90 |
12 x nom dia. of pipe |
| For Close Coiling |
180 |
8 x nom dia. of pipe |
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Steel Pipes & Tubes