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ASTM A182 F12 Forged Fittings
ASTM A182 F12 Forged Fittings
Availability decides this one more often than metallurgy does. F11 and F12 are close enough in chemistry that either would serve most duties, but F11 is the grade stockists actually hold at small bore, so an F12 requirement is usually a specification requirement rather than an engineering preference. Solitaire Overseas supplies A182 F12 forged fittings from India in Class 1 and Class 2. Below: when F12 is genuinely required, how it compares to F11, and grade data.
Technical Data
The Practical Comparison
| F12 | F11 | |
|---|---|---|
| Chromium | 0.80 - 1.25% | 1.00 - 1.50% |
| Molybdenum | 0.44 - 0.65% | 0.44 - 0.65% |
| Material classes | Class 1, Class 2 | Class 1, Class 2, Class 3 |
| Availability at small bore | Usually made to order | Widely stocked |
| Specify it when | The specification names F12, or the plant was built to it | Specifying fresh, or either is acceptable |
Made to order has consequences. A grade that is not held in stock carries a lead time, a minimum quantity and often a price premium that outweighs any nominal material saving. Where a project specification permits either grade, saying so at the enquiry stage usually produces a better answer than ordering F12 by default. Where the specification names F12, or where the existing plant is F12 and a mixed-grade weld is unwelcome, we supply it.
The alloy comparison in more detail is on our WP12 buttweld fittings page.
F12 Chemistry and Classes
| Element | Range |
|---|---|
| Carbon | 0.05 - 0.15% (Cl 1), 0.10 - 0.20% (Cl 2) |
| Manganese | 0.30 - 0.60% (Cl 1), 0.30 - 0.80% (Cl 2) |
| Phosphorus | 0.045% max |
| Sulfur | 0.045% max |
| Silicon | 0.50% max |
| Chromium | 0.80 - 1.25% |
| Molybdenum | 0.44 - 0.65% |
F12 Chemistry and Classes
| Material Class | Tensile min | Yield min |
|---|---|---|
| Class 1 | 415 MPa (60 ksi) | 205 MPa (30 ksi) |
| Class 2 | 485 MPa (70 ksi) | 275 MPa (40 ksi) |
PRESSURE CLASSES
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 F12 Forged Fittings Are Used
- Small bore connections on P12 or WP12 systems, keeping the grade consistent through the joint.
- Instrument and drain lines on plant specified to the grade.
- Maintenance and replacement work, avoiding a mixed-grade weld on existing F12 pipework.
Supplied as couplings, unions,plugs, bushings and street elbows, plus forged elbows and tees.
Matching pipe: ASTM A335 P12 pipes. Closest alternative: F11 forged fittings.
Frequently Asked Questions
If the specification names one, use it. If either is acceptable, F11 is usually the practical choice at small bore because it is widely stocked while F12 is generally made to order, which carries lead time and often a minimum quantity. The chemistries are close enough that most duties would be served by either. See our F11 fittings page.
Product form. F12 under ASTM A182 is the forged fitting to ASME B16.11, socket weld or threaded, 1/8 inch to 4 inch. WP12 under ASTM A234 is the buttweld fitting to ASME B16.9. The 1Cr-0.5Mo alloy is the same. See our WP12 fittings page.
Two, Class 1 and Class 2, distinguished by heat treatment and the resulting mechanical properties. F11 by contrast has three. Note that the A182 material class is separate from the ASME B16.11 pressure class, so a complete order names both, for example F12 Class 2, Class 3000 socket weld.
Request a Quote
Send your fitting type, size, end type, material class and pressure class. If your specification permits F11 as an alternative, tell us and we will compare availability and price before you commit.