ASTM A694 F42–F70 High-Yield Flanges
Teshi Group manufactures ASTM A694 F42–F70 High-Yield flanges (A694 F52, F60, F65, F70 pipeline flanges, MSS SP-44) 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 A694 F42–F70 High-Yield flanges at a glance
| Material | ASTM A694 F42–F70 High-Yield |
|---|---|
| Specification | ASTM A694 F42 to F70 |
| UNS / W.Nr. | — / — |
| 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 A694 F42–F70 High-Yield chemistry and mechanical properties
Chemical composition of ASTM A694 F42–F70 High-Yield (weight %, maximum unless a range)
| Grade | C | Mn | P | S |
|---|---|---|---|---|
| A694 F42 – F70 | 0.26 | 1.60 | 0.025 | 0.025 |
Mechanical properties of ASTM A694 F42–F70 High-Yield (minimum, room temperature)
| Grade | Tensile strength | Yield strength (0.2 %) | Elongation | Note |
|---|---|---|---|---|
| A694 F42 – F70 | — | — | — | Yield = grade number in ksi (F52 = 52 ksi / 360 MPa) |
Matching specifications by product form
| Grade | Forged flanges & fittings | Butt weld fittings | Plate | Pipe |
|---|---|---|---|---|
| A694 F42 – F70UNS — · W.Nr. — | ASTM A694 F42 to F70 | MSS SP-75 WPHY 42–70 | — | API 5L X42 – X70 |
Limits and minimums from the governing ASTM / ASME specifications, summarised for convenience; the current edition takes precedence.
Pressure rating
High-yield pipeline flanges are designed to MSS SP-44 / ASME B16.47 or the project specification. The applicable rating table is issued with every quotation, and flanges are marked with class, material and heat number.
Types we manufacture
Dimension charts
Where ASTM A694 F42–F70 High-Yield 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 A694 F42–F70 High-Yield flanges: common questions
What specification covers ASTM A694 F42–F70 High-Yield flanges?
ASTM A694 F42–F70 High-Yield flanges are forged to ASTM A694 F42 to F70 and dimensioned to ASME B16.5, ASME B16.47 or EN 1092-1.
What is the chemical composition of A694 F42 – F70?
A694 F42 – F70 (UNS —): C 0.26, Mn 1.60, P 0.025, S 0.025 (weight %; single values are maximums).
What are the minimum mechanical properties of A694 F42 – F70?
Tensile strength —, yield strength —.
Is Teshi Group a manufacturer of ASTM A694 F42–F70 High-Yield 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 A694 F42–F70 High-Yield 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).
High-yield carbon steel grade data sheets
High-yield carbon steel overview →Chemical composition, mechanical properties and PDF data sheet for each grade.
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