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ASTM A182 F1 Forged Fittings
ASTM A182 F1 Forged Fittings
At four inches the material saving that justifies WP1 is real. At one inch it has vanished. That is the honest position of F1 forged fittings: carbon-moly costs meaningfully less than chrome-moly by the tonne, but a one inch forged coupling weighs almost nothing, so the price gap between F1 and F11 closes to near irrelevance while the metallurgical gap does not. Solitaire Overseas supplies A182 F1 forged fittings from India where a specification calls for them. Below: when F1 is genuinely the right call at small bore, and when to simply use F11.
Technical Data
When F1 Makes Sense, and When It Does Not
The case for carbon-molybdenum steel is cost. It buys creep strength over plain carbon steel without paying for chromium. That argument holds well on large diameter heavy wall pipe and buttweld fittings, where tonnage is real. It weakens sharply on small forged fittings.
| Specify F1 when | Use F11 instead when |
|---|---|
| The project specification names F1 explicitly | Either grade is acceptable and F11 is more readily available |
| The plant was built to F1 and you are avoiding a mixed-grade weld | You are specifying a new system from scratch |
| The line matches an existing F1 or WP1 run | The service temperature is at the upper end of the range |
| Quantities are large enough for cost to register | The quantity is a handful of fittings |
Saying this plainly is more useful than pretending F1 has a performance advantage it does not have. Where it is specified, we supply it. Where either would do, F11 is usually the easier grade to source and carries the added oxidation resistance chromium provides.
Carbon-Molybdenum, No Specified Chromium
F1 is carbon steel with roughly half a percent of molybdenum and no chromium requirement. Molybdenum raises creep strength; chromium would provide oxidation resistance, and F1 has none specified. That limits the grade to moderate temperature service rather than genuinely hot duty.
| Element | Range |
|---|---|
| Carbon | 0.28% max |
| Manganese | 0.60 - 0.90% |
| Phosphorus | 0.045% max |
| Sulfur | 0.045% max |
| Silicon | 0.20 - 0.35% |
| Chromium | Not specified |
| Molybdenum | 0.44 - 0.65% |
A long-term consideration associated with carbon-molybdenum steels is discussed on our WP1 fittings page and applies equally to F1.
ASME B16.11 Pressure Classes
| End Type | Available Classes | Correlates To |
|---|---|---|
| Socket Weld | Class 3000, 6000, 9000 | Sch 80/XS, Sch 160, XXS |
| Threaded (NPT) | Class 2000, 3000, 6000 | No Class 9000 threaded fitting exists |
Size range: 1/8 inch to 4 inch NPS. Above 4 inch the line moves to buttweld under ASME B16.9.
Where F1 Forged Fittings Are Used
- Small bore connections on WP1 or P1 systems, keeping grade consistent through the joint.
- Moderate temperature instrument and drain lines, where the specification names F1.
- Replacement work on plant originally built to the grade.
Supplied as couplings, unions, plugs, bushings and street elbows, plus forged elbows and tees.
| Item | Detail |
|---|---|
| Material standard | ASTM A182 / ASME SA182 F1 |
| Dimensional | ASME B16.11 |
| Pressure classes | SW 3000/6000/9000, Threaded 2000/3000/6000 |
| Size range | 1/8 inch to 4 inch NPS |
| Chromium | Not specified |
| Matching pipe | ASTM A335 P1 |
| Certification | EN 10204 3.1. PMI on request |
Matching pipe: ASTM A335 P1 pipes.
Frequently Asked Questions
If the specification names F1, use F1. If either would serve, F11 is usually the better practical choice at small bore: it is more widely stocked, and the cost advantage of carbon-moly largely disappears on fittings that weigh very little, while F11's chromium adds oxidation resistance F1 does not have. See our F11 fittings (https://www.solitaire-overseas.com/f11-forged-fittings-astm-a182-india.html) page.
No. ASTM A182 sets no chromium requirement for F1. It is a carbon-molybdenum steel with 0.44 to 0.65 percent molybdenum, which raises creep strength over plain carbon steel but provides no oxidation resistance, so the grade suits moderate rather than high temperature service.
Product form. F1 under ASTM A182 is the forged fitting to ASME B16.11, socket weld or threaded, 1/8 inch to 4 inch. WP1 under ASTM A234 is the buttweld fitting to ASME B16.9. The carbon-molybdenum alloy is the same. See our WP1 fittings (https://www.solitaire-overseas.com/a234-wp1-carbon-moly-pipe-fittings.html) page.
Request a Quote
Send your fitting type, size, end type and pressure class. If your specification permits either F1 or F11, tell us and we will advise on availability and price.