Standard: ASTM A106, Nace, Sour service.
Grade: A, B, C
Range of OD outer diameter: NPS 1/8 inch to NPS 20 inch, 10.13mm to 1219mm
Range of WT wall thickness: SCH 10, SCH 20, SCH STD, SCH 40, SCH 80, to SCH160, SCHXX; 1.24mm up to 1 inch, 25.4mm
Range of length: 20ft to 40ft, 5.8m to 13m, single random lengths of 16 to 22ft, 4.8 to 6.7m, double random length with average 35ft 10.7m
Ends procession: Plain end, beveled, threaded
Coating: Black paint, varnished, epoxy coating, polyethylene coating, FBE and 3PE, CRA Clad and Lined.
ASTM A106 seamless steel pipe covers seamless carbon steel nominal wall pipe for high-temperature service, suitable for bending, flanging and similar forming operations. NPS 1-1/2 and under may be either hot finished or cold drawn. NPS 2 and larger shall be hot finished unless otherwise specified. Surface finish standards are outlined in the specification.
A106 pipe is always produced by the seamless method and can be bent, coiled and flanged and is intended for use in high temperature applications, Pressure systems, Mechanical components, Structural applications, Spreader bars.
Permissible Variations in Dimension
Wall thickness: The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified.
Weights per foot: The weight of any individual length shall not vary more than 10% over and 3.5% under that specified. NOTE – NPS 4 and smaller are weighed in lots. Larger sizes are weighted by individual length.
Outside diameter: Shall not vary from standard specified below at any point.
| NPS | Over | Under |
| 1 ½ and smaller | +1/64” | -1/64” |
| 2-4 | +1/32” | -1/32” |
| 5-8 | +1/16” | -1/32” |
| 10-18 | +3/32” | -1/32” |
| Over 18 | +1/8” | -1/32” |
Lengths of A106 seamless carbon steel pipe
Single random – 16’ – 22’ (5% may be 12’ – 16’)
Double random – Minimum length is 22’. Minimum average is 35’ (5% may be between 16’ – 22’)
ASTM A106/ASME SA106 is the standard specification for seamless carbon steel pipe applied for high temperature services.ASTM A106/ASME SA106 is the standard specification for seamless carbon steel pipe applied for high temperature services.
| Physical Requirements – A106 | |||
| Seamless | Grade A | Grade B | Grade C |
| Tensile Strength (min. psi) | 48,000 | 60,000 | 70,000 |
| Yield Strength (min. psi) | 30,000 | 35,000 | 40,000 |
| Chemical Requirements – A106 | |||
| Element | Grade A | Grade B | Grade C |
| Carbon (max %) | 0.250 | 0.300 | 0.350 |
| Manganese (%) | 0.270 – 0.930 | 0.290 – 1.060 | 0.290 – 1.060 |
| Phosphorus (max %) | 0.035 | 0.035 | 0.035 |
| Sulfur (max %) | 0.035 | 0.035 | 0.035 |
| Silicon (min %) | 0.100 | 0.100 | 0.100 |