Carbon & alloy steel
ASTM A106 Grade B is seamless carbon-steel pipe for high-temperature service, the default material for refinery, power and process piping.
- Spec ASTM A106
- Density 7.85 g/cm³
Also known as / equivalents
| System | Designation |
|---|---|
| Also known as | A106 Gr B, SA106B |
Chemical composition
| Element | Min % | Max % |
|---|---|---|
| C | — | 0.30 |
| Mn | 0.29 | 1.06 |
| P | — | 0.035 |
| S | — | 0.035 |
| Si | 0.10 | — |
| Cr | — | 0.40 |
| Cu | — | 0.40 |
| Mo | — | 0.15 |
| Ni | — | 0.40 |
| V | — | 0.08 |
| Fe | Bal. | — |
Mechanical properties
| Property | Value |
|---|---|
| Tensile strength (min) | 415 MPa (60.2 ksi) |
| Yield strength, 0.2% offset (min) | 240 MPa (34.8 ksi) |
| Elongation in 50 mm (min) | 30 % |
Physical properties
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
| Magnetic response | Magnetic | — |
Available forms & specifications
| Form | Specification | Size range |
|---|---|---|
| Pipe | ASTM A106, A53 | 1/8" – 24" NB |
| Flanges & forgings | ASTM A105 | 1/2" – 48" NB (larger on request) |
| Buttweld fittings | ASTM A234 | 1/2" – 48" NB |
| Bars | BS 970 (EN8) | 3 mm – 500 mm |
Corrosion & temperature resistance
Carbon steels have no inherent corrosion resistance; they are painted, galvanised or lined for corrosive service. A106 and A105 are rated for elevated-temperature pressure service.
Applications
ASTM A106 Grade B: Process, steam and refinery piping. Process and utility piping, pressure-system flanges and fittings, shafts and general engineering.
ASTM A106 Grade B vs ASTM A53 Grade B
| ASTM A106 Grade B | ASTM A53 Grade B | |
|---|---|---|
| UNS | — | — |
| Key property | Seamless high-temperature pipe | General-purpose pipe |
| Typical use | Process, steam and refinery piping | Water, gas, air and structural piping |
| Cr (wt %) | ≤ 0.40 | ≤ 0.40 |
| Ni (wt %) | ≤ 0.40 | ≤ 0.40 |
| Mo (wt %) | ≤ 0.15 | ≤ 0.15 |
| C (wt %) | ≤ 0.30 | ≤ 0.30 |
| Tensile / yield (min, MPa) | 415 / 240 | 415 / 240 |
Frequently asked questions
What is ASTM A106 Grade B used for?
Seamless high-temperature pipe. Typical uses: process, steam and refinery piping.
Is ASTM A106 Grade B magnetic?
Magnetic.
In which forms can I buy ASTM A106 Grade B from Rajkamal Metals?
Sheets & Plates, Pipes & Tubes, Round Bars & Rods, Structural Sections, Flanges, Buttweld Fittings, Socket Weld & Threaded Fittings, Fasteners, Dish Ends, Custom Orders. Sizes as per standard; other sizes on request.
Do you supply a Mill Test Certificate with ASTM A106 Grade B?
Yes. Actual values are given in the Mill Test Certificate (EN 10204 3.1) supplied with each order.
What is the difference between ASTM A106 Grade B and ASTM A53 Grade B?
ASTM A106 Grade B: seamless high-temperature pipe. ASTM A53 Grade B: general-purpose pipe. See the comparison table on this page.
Last updated: 30 October 2026. Grade names identify the supply range; designations are not engineering equivalents. Availability, make, origin and documentation are confirmed at quotation.
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