ASTM A106 Grade B Carbon Steel Pipes – ASME SA106 Gr B Seamless Pipe
ASC LLP, Mumbai, supplies ASTM A106 Grade B pipe (ASME SA106 Gr B) – seamless carbon steel pipe for high-temperature service. Pipe is available from ½” to 24″ NB (larger on request) in SCH 10 to XXS, with EN 10204 3.1 certificates. It is also available dual or triple certified to A106 B / A53 B / API 5L. See our full carbon steel range.
What is ASTM A106 Grade B Pipe?
ASTM A106 is the specification for seamless carbon steel pipe for high-temperature service, NPS ⅛” to 48″. It has three grades – A, B and C – and Grade B is by far the most used. A106 pipe is always seamless (hot-finished or cold-drawn) and is suitable for bending, flanging and welding. ASME SA106 is the identical ASME Boiler & Pressure Vessel Code version. A106 B is the standard carbon steel line pipe for refinery, petrochemical, power-plant and steam piping under ASME B31.1 and B31.3.
A106 Gr B Pipe – Quick Facts
- Specification: ASTM A106 / ASME SA106, Grade B
- Type: seamless – hot-finished or cold-drawn
- Strength: 415 MPa (60 ksi) tensile, 240 MPa (35 ksi) yield, minimum
- Sizes: ⅛” – 48″ NPS per ASME B36.10M; SCH 10, 20, 30, STD, 40, XS, 80, 120, 160, XXS
- Options: NACE MR0175 / MR0103, galvanised, coated, dual-certified A106 B / A53 B / API 5L
- Certificate: EN 10204 3.1; 3.2 / third-party inspection on request
ASTM A106 Grade A vs Grade B vs Grade C
| Property | Grade A | Grade B | Grade C |
| Tensile strength, min. | 330 MPa (48 ksi) | 415 MPa (60 ksi) | 485 MPa (70 ksi) |
| Yield strength, min. | 205 MPa (30 ksi) | 240 MPa (35 ksi) | 275 MPa (40 ksi) |
| Elongation in 50 mm, longitudinal | 35% | 30% | 30% |
| Elongation in 50 mm, transverse | 25% | 16.5% | 16.5% |
| Carbon, max. | 0.25% | 0.30% | 0.35% |
| Manganese | 0.27 – 0.93% | 0.29 – 1.06% | 0.29 – 1.06% |
Elongation values are the basic minimums for standard round or strip specimens; lower values apply to thin walls as per the specification. Grade B is the normal stock grade; Grade C is used where higher strength is needed.
Manufacture, Heat Treatment & Testing
- Hot-finished pipe (most sizes over 2″): normally supplied without further heat treatment.
- Cold-drawn pipe (small sizes, close tolerance): must be heat-treated at 650 °C (1200 °F) or higher after the final cold draw.
- Tests: tension test, bend test (NPS 2 and under) or flattening test, hydrostatic test or non-destructive electric test on each length, plus dimensional and visual inspection.
- NACE pipe: for sour service, A106 B can be supplied to NACE MR0175 / ISO 15156 or MR0103 with hardness control (22 HRC max.).
Temperature Limits
A106 B is suitable for high-temperature service, but prolonged exposure above about 425 °C (800 °F) can cause graphitisation of carbon steel. For higher temperatures, chrome-moly pipe such as A335 P11 or P22 is normally used. For low-temperature service, choose ASTM A333 Grade 6.
A106 Gr B vs A53 Gr B vs API 5L Gr B
| Item | ASTM A106 Gr B | ASTM A53 Gr B | API 5L Gr B (PSL1) |
| Type | Seamless only | Seamless (S) or ERW (E) | Seamless, ERW, SAW |
| Main use | High-temperature process & steam piping | General utility & pressure piping | Oil & gas line pipe |
| Tensile / yield min. (MPa) | 415 / 240 | 415 / 240 | 415 / 245 |
| Silicon | 0.10% min. | Not specified | Not specified |
| Size range | ⅛” – 48″ | ⅛” – 26″ | ⅛” – large diameters |
Because the requirements overlap, seamless pipe is often triple-certified to A106 B / A53 B / API 5L B (PSL1) and can be used under any of the three specs. See ASTM A53 Gr B pipes.
ASTM A106 Gr B Pipe Schedule & Weight Chart (ASME B36.10M)
| NPS | OD (mm) | SCH 40 (mm) | SCH 80 (mm) | SCH 160 (mm) | XXS (mm) | SCH 40 kg/m | SCH 80 kg/m |
| ⅛” | 10.29 | 1.73 | 2.41 | – | – | 0.37 | 0.47 |
| ¼” | 13.72 | 2.24 | 3.02 | – | – | 0.63 | 0.80 |
| ⅜” | 17.15 | 2.31 | 3.20 | – | – | 0.85 | 1.10 |
| ½” | 21.34 | 2.77 | 3.73 | 4.78 | 7.47 | 1.27 | 1.62 |
| ¾” | 26.67 | 2.87 | 3.91 | 5.56 | 7.82 | 1.68 | 2.19 |
| 1″ | 33.40 | 3.38 | 4.55 | 6.35 | 9.09 | 2.50 | 3.24 |
| 1¼” | 42.16 | 3.56 | 4.85 | 6.35 | 9.70 | 3.39 | 4.46 |
| 1½” | 48.26 | 3.68 | 5.08 | 7.14 | 10.15 | 4.05 | 5.41 |
| 2″ | 60.33 | 3.91 | 5.54 | 8.74 | 11.07 | 5.44 | 7.49 |
| 2½” | 73.03 | 5.16 | 7.01 | 9.53 | 14.02 | 8.64 | 11.41 |
| 3″ | 88.90 | 5.49 | 7.62 | 11.13 | 15.24 | 11.29 | 15.27 |
| 4″ | 114.30 | 6.02 | 8.56 | 13.49 | 17.12 | 16.07 | 22.32 |
| 5″ | 141.30 | 6.55 | 9.53 | 15.88 | 19.05 | 21.77 | 30.97 |
| 6″ | 168.28 | 7.11 | 10.97 | 18.26 | 21.95 | 28.26 | 42.56 |
| 8″ | 219.08 | 8.18 | 12.70 | 23.01 | 22.23 | 42.54 | 64.63 |
| 10″ | 273.05 | 9.27 | 15.09 | 28.58 | 25.40 | 60.30 | 95.99 |
| 12″ | 323.85 | 10.31 | 17.48 | 33.32 | 25.40 | 79.72 | 132.06 |
| 14″ | 355.60 | 11.13 | 19.05 | 35.71 | – | 94.55 | 158.10 |
| 16″ | 406.40 | 12.70 | 21.44 | 40.49 | – | 123.30 | 203.53 |
| 18″ | 457.20 | 14.27 | 23.83 | 45.24 | – | 155.87 | 254.67 |
| 20″ | 508.00 | 15.09 | 26.19 | 50.01 | – | 183.42 | 311.17 |
| 24″ | 609.60 | 17.48 | 30.96 | 59.54 | – | 255.24 | 441.78 |
Plain-end weights for carbon steel. STD = SCH 40 up to 10″; XS = SCH 80 up to 8″. Other schedules (10, 20, 30, 60, 100, 120, 140) on request. Full charts: Schedule 40 pipe and Schedule 80 pipe.
A106 Grade B Mechanical Properties
| Property | ASTM A106 Grade B |
| Tensile strength, min. | 415 MPa (60 ksi) |
| Yield strength, min. | 240 MPa (35 ksi) |
| Elongation in 50 mm, min. | 30% longitudinal / 16.5% transverse |
| Hardness | Not specified (22 HRC max. for NACE pipe) |
A106 Gr B Pipe Specifications
| Item | Details |
| Specification | ASTM A106 / ASME SA106, Grade B (A and C on request) |
| Type | Seamless – hot-finished or cold-drawn |
| Size | ⅛” – 24″ NB stock; up to 48″ on request |
| Schedule | SCH 10 – XXS, STD, XS, or specified wall |
| Length | Single random (5 – 7 m), double random (11 – 13 m), cut lengths |
| Ends | Plain, bevelled; threaded & coupled for small sizes |
| Coating | Black varnish, bare, galvanised, 3LPE / FBE, epoxy on request |
| Testing | Tension, bend / flattening, hydro or NDE, PMI; UT, impact and NACE on request |
| Certificate | EN 10204 3.1 / 3.2 |
A106 Grade B Chemical Composition
| Element | ASTM A106 Grade B (%) |
| Carbon (C) | 0.30 max. |
| Manganese (Mn) | 0.29 – 1.06 |
| Phosphorus (P) | 0.035 max. |
| Sulphur (S) | 0.035 max. |
| Silicon (Si) | 0.10 min. |
| Copper (Cu) | 0.40 max. |
| Nickel (Ni) | 0.40 max. |
| Chromium (Cr) | 0.40 max. |
| Molybdenum (Mo) | 0.15 max. |
| Vanadium (V) | 0.08 max. |
Cu + Ni + Cr + Mo + V together must not exceed 1.00%. A higher manganese content is allowed for lower carbon, as set out in the specification.
A106 Gr B Pipe Pressure Rating (Approx.)
| NPS | SCH 40 (psi) | SCH 80 (psi) | SCH 160 (psi) |
| ½” | 5,000 | 6,970 | 9,300 |
| 1″ | 3,810 | 5,270 | 7,680 |
| 2″ | 2,380 | 3,430 | 5,640 |
| 3″ | 2,260 | 3,190 | 4,800 |
| 4″ | 1,910 | 2,770 | 4,500 |
| 6″ | 1,520 | 2,390 | 4,110 |
| 8″ | 1,340 | 2,110 | 3,970 |
| 10″ | 1,220 | 2,010 | 3,950 |
| 12″ | 1,140 | 1,960 | 3,880 |
Basis: ASME B31.3, P = 2SEt / (D − 2Yt), S = 137.9 MPa (20 ksi) up to about 204 °C, E = 1.0, Y = 0.4, wall less 12.5% mill tolerance, plain-end pipe, no corrosion allowance. Guide values only – ratings fall at higher temperatures and for threaded pipe.
Physical Properties
| Property | Value (approx.) |
| Density | 7.85 g/cm³ |
| Modulus of elasticity | ≈ 200 GPa |
| Thermal conductivity | ≈ 50 W/m·K |
| Thermal expansion (20 – 100 °C) | ≈ 11.7 µm/m·K |
Applications of ASTM A106 Grade B Pipes
| Industry | Typical A106 Gr B pipe applications |
| Oil refineries | Process lines, hydrocarbon and utility piping |
| Petrochemical & chemical plants | Process and steam piping |
| Power plants | Steam, feedwater and condensate lines |
| Oil & gas processing | Plant piping, gathering and compressor station piping |
| Industrial plants | Boiler house piping, hot water, compressed air and thermal oil systems |
Matching components: A234 WPB fittings, fittings for A106 Gr B pipe and A105 flanges.
Why Buy A106 Gr B Pipe from ASC LLP?
- Certified seamless pipe: A106 B / SA106 B with EN 10204 3.1 certificates; multi-certified A106 B / A53 B / API 5L on request.
- Full size range: ½” – 24″ NB, SCH 10 to XXS, cut lengths, bevelled ends.
- Special requirements: NACE MR0175 / MR0103, impact testing, third-party inspection.
- Complete piping package: WPB fittings, A105 flanges, A53 B pipe and A333 Gr 6 low-temperature pipe.
Send size, schedule, length and quantity to sales@amardeepsteel.com, call 022-67439130 or contact us.
Frequently Asked Questions – ASTM A106 Grade B Pipe
What is ASTM A106 Grade B pipe?
ASTM A106 Grade B is seamless carbon steel pipe for high-temperature service. It has a minimum tensile strength of 415 MPa (60 ksi) and minimum yield strength of 240 MPa (35 ksi) and is the most common pipe grade in refinery, petrochemical and power-plant piping.
What are the mechanical properties of ASTM A106 Grade B?
Minimum tensile strength is 415 MPa (60 ksi), minimum yield strength 240 MPa (35 ksi), and minimum elongation 30% longitudinal or 16.5% transverse in 50 mm.
What is the chemical composition of A106 Grade B?
A106 Grade B contains C 0.30% max., Mn 0.29–1.06%, P 0.035% max., S 0.035% max., Si 0.10% min., and Cu, Ni, Cr 0.40% max. each, Mo 0.15% max. and V 0.08% max. (Cu+Ni+Cr+Mo+V not more than 1.00%).
What is the difference between A106 and A53 pipe?
A106 is seamless only and intended for high-temperature service, with a minimum silicon content. A53 can be seamless or ERW and is used for general pressure and utility piping. Grade B of both has the same 415/240 MPa strength, and seamless pipe is often dual-certified to both.
Is A106 pipe seamless?
Yes. ASTM A106 covers only seamless pipe, either hot-finished or cold-drawn. Welded carbon steel pipe is supplied to specifications such as A53 Type E or API 5L.
What is the maximum temperature for A106 Grade B pipe?
A106 B is used for high-temperature service, but prolonged service above about 425 °C (800 °F) risks graphitisation. Above this range, chrome-moly pipe such as ASTM A335 P11 or P22 is normally specified. Design limits are set by the applicable code (ASME B31.1 or B31.3).
Global Reach
ASC LLP supplies carbon steel pipes, fittings and flanges to refineries, EPC contractors and plants in the USA, Europe, the Middle East and Asia, with secure packing and full documentation. Buyers worldwide rely on our ASTM A106 Grade B carbon steel pipes for certified material and traceability.
Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.
