ASTM A105 / A105N Carbon Steel Flanges
Teshi Group manufactures ASTM A105 / A105N Carbon Steel flanges (A105, A105N, carbon steel forged flanges) as an OEM in India — forged, machined, marked and certified in-house to ASME B16.5, ASME B16.47, EN 1092-1 and customer drawings.
Carbon steel covers most piping by volume: A105 for general service, A350 LF2 and LF3 where impact toughness is needed at low temperature, and A694 high-yield grades matched to API 5L line pipe.
ASTM A105 / A105N Carbon Steel flanges at a glance
| Material | ASTM A105 / A105N Carbon Steel |
|---|---|
| Specification | ASTM A105 (N = normalised) |
| UNS / W.Nr. | K03504 / ~1.0460 |
| Sizes | NPS ½"–24" (ASME B16.5), 26"–60" (ASME B16.47 A / B), DN 10–600 (EN 1092-1) |
| Pressure class | Class 150, 300, 600, 900, 1500, 2500 · PN 6–40 |
| Facing / ends | RF, FF, RTJ, tongue & groove, male-female; serrated or smooth finish |
| Certification | EN 10204 3.1 standard · 3.2 with third-party inspection · IBR on request |
| Testing | PMI, hardness, dimensional; UT, IGC, impact and ferrite as specified |
ASTM A105 / A105N Carbon Steel chemistry and mechanical properties
Chemical composition of ASTM A105 / A105N Carbon Steel (weight %, maximum unless a range)
| Grade | C | Mn | Si | P | S |
|---|---|---|---|---|---|
| A105 / A105N | 0.35 | 0.60–1.05 | 0.10–0.35 | 0.035 | 0.040 |
Mechanical properties of ASTM A105 / A105N Carbon Steel (minimum, room temperature)
| Grade | Tensile strength | Yield strength (0.2 %) | Elongation | Note |
|---|---|---|---|---|
| A105 / A105N | 485 MPa (70 ksi) | 250 MPa (36 ksi) | 22 % | Max 187 HB |
Matching specifications by product form
| Grade | Forged flanges & fittings | Butt weld fittings | Plate | Pipe |
|---|---|---|---|---|
| A105 / A105NUNS K03504 · W.Nr. ~1.0460 | ASTM A105 (N = normalised) | ASTM A234 WPB | ASTM A516 Gr 70 / IS 2062 | ASTM A106 Gr B / API 5L |
Limits and minimums from the governing ASTM / ASME specifications, summarised for convenience; the current edition takes precedence.
Pressure rating
Pressure–temperature ratings of ASTM A105 / A105N Carbon Steel flanges to ASME B16.5 (bar, gauge). Ratings apply to the flange; the joint rating also depends on bolting and gasket.
Material Group 1.1: A105, A350 LF2, A216 WCB
| Temp.°C | Class 150bar | Class 300bar | Class 600bar | Class 900bar | Class 1500bar | Class 2500bar |
|---|---|---|---|---|---|---|
| −29 to 38 | 19.6 | 51.1 | 102.1 | 153.2 | 255.3 | 425.5 |
| 50 | 19.2 | 50.1 | 100.2 | 150.4 | 250.6 | 417.7 |
| 100 | 17.7 | 46.6 | 93.2 | 139.8 | 233.0 | 388.3 |
| 150 | 15.8 | 45.1 | 90.2 | 135.2 | 225.4 | 375.6 |
| 200 | 13.8 | 43.8 | 87.6 | 131.4 | 219.0 | 365.0 |
| 250 | 12.1 | 41.9 | 83.9 | 125.8 | 209.7 | 349.5 |
| 300 | 10.2 | 39.8 | 79.6 | 119.5 | 199.1 | 331.8 |
| 325 | 9.3 | 38.7 | 77.4 | 116.1 | 193.6 | 322.6 |
| 350 | 8.4 | 37.6 | 75.1 | 112.7 | 187.8 | 313.0 |
| 375 | 7.4 | 36.4 | 72.7 | 109.1 | 181.8 | 303.1 |
| 400 | 6.5 | 34.7 | 69.4 | 104.2 | 173.6 | 289.3 |
| 425 | 5.5 | 28.8 | 57.5 | 86.3 | 143.8 | 239.7 |
| 450 | 4.6 | 23.0 | 46.0 | 69.0 | 115.0 | 191.7 |
| 475 | 3.7 | 17.4 | 34.9 | 52.3 | 87.2 | 145.3 |
| 500 | 2.8 | 11.8 | 23.5 | 35.3 | 58.8 | 97.9 |
| 538 | 1.4 | 5.9 | 11.8 | 17.7 | 29.5 | 49.2 |
Types we manufacture
Dimension charts
Where ASTM A105 / A105N Carbon Steel is used
- General refinery, process and utility piping (A105N)
- LNG, ammonia and low-temperature service (LF2, LF3)
- Oil and gas transmission pipelines (A694)
- Steel plant water, air and gas mains
- Boiler and steam service with IBR certification
Testing & certification
- Normalising where specified (A105N)
- Carbon equivalent limit (e.g. CE ≤ 0.43) when the project specifies it
- Charpy V-notch impact testing for LF grades
- Hardness, dimensional and visual inspection
- IBR certification when specified
Related materials
FAQ
ASTM A105 / A105N Carbon Steel flanges: common questions
What specification covers ASTM A105 / A105N Carbon Steel flanges?
ASTM A105 / A105N Carbon Steel flanges are forged to ASTM A105 (N = normalised) and dimensioned to ASME B16.5, ASME B16.47 or EN 1092-1.
What is the chemical composition of A105 / A105N?
A105 / A105N (UNS K03504): C 0.35, Mn 0.60–1.05, Si 0.10–0.35, P 0.035, S 0.040 (weight %; single values are maximums).
What are the minimum mechanical properties of A105 / A105N?
Tensile strength 485 MPa (70 ksi), yield strength 250 MPa (36 ksi), elongation 22 %.
Is Teshi Group a manufacturer of ASTM A105 / A105N Carbon Steel flanges in India?
Yes. Teshi Group has manufactured flanges and fittings in India since 1971 and is ISO 9001:2015 certified and IBR approved. Every ASTM A105 / A105N Carbon Steel piece is hard-stamped with its heat number and supplied with an EN 10204 3.1 certificate; 3.2 with third-party inspection on request.
What is the difference between A105 and A105N?
A105N is A105 supplied in the normalised condition, which refines the grain and improves toughness. Many project specifications require A105N.
At what temperature is A350 LF2 impact tested?
A350 LF2 Class 1 is Charpy impact tested at −46 °C (−50 °F); LF3 is tested at −101 °C (−150 °F).
Ready to build to spec?
Share your drawing, bill of materials or technical requirements with the Teshi team.