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ASTM A182 F23 Forged Fittings
ASTM A182 F23 Forged Fittings
F23 and F24 exist to solve one problem: P22 is not strong enough and P91 is too much trouble. Both sit deliberately between the two, offering more creep strength than 2.25Cr-1Mo without the narrow tempering windows and mandated consumables that make Grade 91 demanding. F23 gets there with tungsten. It is an uncommon grade and we supply it to order rather than from stock.
Part of our alloy steel fittings range. See also F24 forged fittings.
Chemical Composition
| Element | Range |
|---|---|
| Carbon | 0.04 - 0.10% |
| Manganese | 0.10 - 0.60% |
| Silicon | 0.50% max |
| Chromium | 1.90 - 2.60% |
| Molybdenum | 0.05 - 0.30% |
| Tungsten | 1.45 - 1.75% |
| Vanadium | 0.20 - 0.30% |
| Niobium | 0.02 - 0.08% |
| Boron | 0.0005 - 0.006% |
| Nitrogen | 0.030% max |
Applications
- Boiler and superheater service, where P22 lacks creep strength but Grade 91 fabrication control is unwelcome.
- Retrofit and upgrade work, replacing P22 components on plant that has been uprated.
- Specification-driven supply, where a project or licensor names Grade 23 explicitly.
Product Range and Supply
Supplied as forged fittings to ASME B16.11, socket weld and threaded, 1/8 inch to 4 inch NPS, in pressure classes 2000 to 9000. Available as couplings, unions, plugs and forged elbows and tees.
Made to order. This grade is not held in stock. Expect a lead time and a minimum quantity, and send the full specification with your enquiry so availability can be confirmed before you commit. EN 10204 3.1 certification is supplied as standard, with PMI and hardness testing on request.
Frequently Asked Questions
F23 is a tungsten-bearing 2.25Cr grade positioned between P22 and P91. It offers higher creep strength than 2.25Cr-1Mo while avoiding the narrow tempering windows and mandated welding consumables that make Grade 91 demanding to fabricate. It is specified mainly in boiler and superheater service and on uprated plant.
No. F23 is an uncommon grade and is generally made to order rather than held in stock. Expect a lead time and a minimum quantity, and send the full specification with your enquiry so availability can be confirmed before committing.
Both target the same gap between P22 and P91, from different directions. F23 uses a tungsten addition to raise creep strength; F24 uses vanadium with titanium and a boron addition. Both are uncommon and generally made to order.
Enquire About This Grade
Send your fitting type, size, end type, pressure class and the governing specification, and we will confirm whether the grade can be sourced, along with lead time and certification.