Steel A369 FP92
ASTM A369 FP92
A369 FP92 is a 9Cr-2W-Mo-V (P92-type) creep-strength-enhanced ferritic pipe steel, the tungsten-strengthened development of P91, matching A335 P92 and X10CrWMoVNb9-2 / 1.4901.
Reference datasheet — A369 FP92 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the N+T condition
A369 FP92 tempers and conditions
A369 FP92 is supplied in 5 conditions, soft to hard. N+T is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Intermediate softened state supplied for heavy machining or cold work; must be re-normalized and tempered before pressure service. | 400 | 600 | 26 | 10 HRC | 3 % IACS |
N+T | Use where hardness must stay well below 250 HB (heavy field welding, NDE hardness surveys) and maximum Charpy energy is wanted. | 470 | 655 | 24 | 14 HRC | 2.9 % IACS |
N+TDefault Normalized and tempered | Standard delivery condition for all A369 FP92 pipe — the only state accepted for pressure service. | 510 | 700 | 22 | 19 HRC | — |
N+T | Pick when the purchaser wants the top of the strength band (thick headers, high design stress) and can accept hardness near the 250 HB limit. | 570 | 770 | 19 | 23 HRC | 2.9 % IACS |
As-forged / as-quenched | Condition of the forged and bored shell before final N+T; hard and brittle, listed only for shop handling and machining planning. | 950 | 1,300 | 9 | 43 HRC | 2.5 % IACS |
What is A369 FP92?
A369 FP92 is a 9Cr-2W-Mo-V (P92-type) creep-strength-enhanced ferritic pipe steel, the tungsten-strengthened development of P91, matching A335 P92 and X10CrWMoVNb9-2 / 1.4901. Forged and bored pipe is used in ultra-supercritical boilers and high-pressure steam headers up to 620 °C, with 510 MPa yield, 700 MPa tensile, 22 % elongation and about 220 HB (19 HRC) in the N+T condition. It is harder to weld than P91 (weldability 35/100), needs preheat, controlled heat input and 750–770 °C PWHT, and is not corrosion resistant; machinability rates 40/100. Use P91 where the extra creep strength is not required. A369 FP92 has a density of 7.78 g/cm³ (0.281 lb/in³), lighter than 91% of steel grades. It melts at 1,420°C (2,588 °F). A369 FP92 has a yield strength of 510 MPa (74 ksi) and a tensile strength of 700 MPa (102 ksi) — stronger than 65% of steel grades. Elongation at break is 22% and the elastic modulus is 218 GPa (31.6 Msi).
What is A369 FP92 used for?
- Ultra-supercritical boiler piping
- High-pressure steam headers
- Main steam and hot reheat lines
- Superheater and reheater outlet headers
- Forged and bored thick-wall pipe spools
- High-temperature pipe fittings and elbows
Advantages
- High service temperature — 620°C (1,148 °F), better than 99% of steel grades
- Good corrosion resistance — 30/100, better than 95% of steel grades
- Tough — resists crack growth — 130 MPa·√m (118.3 ksi·√in), better than 89% of steel grades
Limitations
- Poor heat conductor — 26 W/m·K (15 BTU/hr·ft·°F), worse than 87% of steel grades
- High embodied carbon — 2.6 kg CO₂/kg, worse than 87% of steel grades
- Difficult to machine — 40/100, worse than 77% of steel grades
A369 FP92 properties
Typical room-temperature values for A369 FP92-N+T; bars are the position among steel grades.
Physical3
A369 FP92 has a density of 7.78 g/cm³ (0.281 lb/in³), lighter than 91% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
A369 FP92 has a yield strength of 510 MPa (74 ksi) and a tensile strength of 700 MPa (102 ksi) — stronger than 65% of steel grades. Elongation at break is 22% and the elastic modulus is 218 GPa (31.6 Msi).
Thermal6
A369 FP92 is rated for continuous service to 620°C (1,148 °F). It conducts heat at 26 W/m·K (15 BTU/hr·ft·°F), worse than 87% of steel grades. Thermal expansion is 10.8 µm/m·K (6 µin/in·°F).
Electrical2
A369 FP92 has an electrical resistivity of 6×10⁻⁷ Ω·m.
Chemical & Environmental3
Corrosion resistance is poor (30/100), better than 95% of steel grades.
Sustainability4
Producing a kilogram of A369 FP92 takes about 34 MJ of energy and emits 2.6 kg of CO₂ — more than 82% of steel grades. Typical recycled content is 25%.
Manufacturability6
A369 FP92's machinability is fair (40/100, worse than 77% of steel grades); weldability fair (35/100); formability poor (30/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. A369 FP92 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with A369 FP92
Is A369 FP92 easy to machine?
Machine in the N+T (200–230 HB) state with rigid setups, coated carbide, moderate speed and heavy positive feed; Nb/V carbides are abrasive and the steel work-hardens if feeds are too light.
Can A369 FP92 be welded?
GTAW root + SMAW/FCAW/SAW with matching 9Cr-2W consumables, 200–250 °C preheat, interpass ≤300 °C, cool to <100 °C then PWHT 750–770 °C for 2–4 h; avoid over-alloyed weld metal and minimize heat input to limit Type IV HAZ cracking.
Can A369 FP92 be formed, bent or molded?
Hot bend/forge at 1050–1150 °C followed by full re-normalizing and tempering; cold bending is limited and any significant cold strain requires re-heat treatment.
A369 FP92 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| C | 0.07 – 0.13 | 0.11 |
| Mn | 0.3 – 0.6 | 0.45 |
| Si | ≤ 0.5 | 0.25 |
| P | ≤ 0.02 | 0.01 |
| S | ≤ 0.01 | 0 |
| Cr | 8.5 – 9.5 | 9 |
| Mo | 0.3 – 0.6 | 0.45 |
| Wsolid-solution strengthener, key P92 addition | 1.5 – 2 | 1.75 |
| V | 0.15 – 0.25 | 0.2 |
| Nb | 0.04 – 0.09 | 0.06 |
| N | 0.03 – 0.07 | 0.05 |
| Bstabilizes M23C6 at grain boundaries | 0 – 0.01 | 0 |
| Ni | ≤ 0.4 | 0.15 |
| Allow Al to keep N available for MX | ≤ 0.04 | 0.02 |
| Ti | ≤ 0.01 | |
| Zr | ≤ 0.01 | |
| Fe | balance |
What surface finishes work on A369 FP92?
Supplied machined/bored or shot-blast finished; use high-temperature aluminide or Al-rich paint plus insulation for outer surfaces — the steel is not stainless and rusts freely in wet ambient storage.
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel A369 FP92 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- A335 P92
- Similar grades
- X10CrWMoVNb9-21.4901
How much does A369 FP92 cost?
A369 FP92 is a high-cost steel ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
A369 FP92 — frequently asked
What is A369 FP92 used for?
A369 FP92 is typically used for ultra-supercritical boiler piping, high-pressure steam headers, main steam and hot reheat lines, superheater and reheater outlet headers, forged and bored thick-wall pipe spools and high-temperature pipe fittings and elbows. In short: higher creep strength than P91; 620 °C service capability; most demanding weld procedure.
What is the yield strength of A369 FP92?
A369 FP92 has a typical yield strength of 510 MPa (74 ksi) and a tensile strength of 700 MPa (102 ksi) — stronger than 65% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is A369 FP92 easy to machine?
Not especially — machinability is rated fair (40/100, worse than 77% of steel grades). Machine in the N+T (200–230 HB) state with rigid setups, coated carbide, moderate speed and heavy positive feed; Nb/V carbides are abrasive and the steel work-hardens if feeds are too light.
Can A369 FP92 be welded?
With care — weldability is rated fair (35/100). GTAW root + SMAW/FCAW/SAW with matching 9Cr-2W consumables, 200–250 °C preheat, interpass ≤300 °C, cool to <100 °C then PWHT 750–770 °C for 2–4 h; avoid over-alloyed weld metal and minimize heat input to limit Type IV HAZ cracking.
What surface finishes work on A369 FP92?
Supplied machined/bored or shot-blast finished; use high-temperature aluminide or Al-rich paint plus insulation for outer surfaces — the steel is not stainless and rusts freely in wet ambient storage.
Can A369 FP92 be formed, bent or molded?
Hot bend/forge at 1050–1150 °C followed by full re-normalizing and tempering; cold bending is limited and any significant cold strain requires re-heat treatment.
What is the maximum service temperature of A369 FP92?
A369 FP92 is rated for continuous use to about 620°C (1,148 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between A369 FP92 N+T and A369 FP92-AF?
N+T is the default condition — standard delivery condition for all A369 FP92 pipe — the only state accepted for pressure service. AF: condition of the forged and bored shell before final N+T; hard and brittle, listed only for shop handling and machining planning. Yield strength is 510 MPa in N+T versus 950 MPa in AF.
How much does A369 FP92 cost?
A369 FP92 is a high-cost steel ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASTM A369/A369M — Carbon and Ferritic Alloy Steel Forged and Bored Pipe for High-Temperature Service — ASTM International (2018)
- ASTM A335/A335M — Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service (Grade P92) — ASTM International (2022)
- EN 10216-2 — Seamless steel tubes for pressure purposes, X10CrWMoVNb9-2 (1.4901) — CEN (2020)
- ASME BPVC Section II Part D / B31.1 allowable stresses for Grade 92 — ASME (2023)
- NIMS Creep Data Sheet series, 9Cr-1.8W-0.5Mo-VNb steel — NIMS (2014)
- ASM Handbook Vol.1 — Properties of Heat-Resistant Ferritic Steels — ASM International (1990)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.