Steel A369 FP2
ASTM A369 FP2
A369 FP2 is a 0.5Cr-0.5Mo forged and bored alloy steel pipe to ASTM A369, the forged counterpart of A335 P2 seamless pipe.
Reference datasheet — A369 FP2 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 ANN condition
A369 FP2 tempers and conditions
A369 FP2 is supplied in 2 conditions, soft to hard. ANN is the default FabDigit quotes; the values on this page are for it.
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ANNDefault Annealed | Standard stocked condition for FP2 forged-and-bored pipe: softest, best machinability and bending, meets 380/205 MPa minimums. | 255 | 450 | 34 | 131 HB | — |
Normalized and tempered | Pick for higher strength and better toughness/creep consistency in thicker forged pipe and for code work needing N+T documentation. | 320 | 500 | 28 | 155 HB | — |
Supply forms, finishes and certifications
Ways A369 FP2 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
ISO-ANN | Isothermal annealed | Certification |
What is A369 FP2?
A369 FP2 is a 0.5Cr-0.5Mo forged and bored alloy steel pipe to ASTM A369, the forged counterpart of A335 P2 seamless pipe. It serves moderate elevated-temperature steam and header duty to 540 °C, supplied annealed, ISO-annealed or normalized and tempered with 255 MPa yield, 450 MPa tensile, 34% elongation and 131 HB. As the leanest Cr-Mo grade in the family it has the best machinability (62) and weldability (72) scores here, but the lowest creep strength and no corrosion resistance. Move to FP12 or FP22 when temperature or pressure increases. A369 FP2 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,490°C (2,714 °F). A369 FP2 has a yield strength of 255 MPa (37 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 93% of steel grades. Elongation at break is 34% and the elastic modulus is 205 GPa (29.7 Msi).
What is A369 FP2 used for?
- Moderate-temperature steam piping
- Header fittings
- Boiler feed and connecting piping
- Forged pipe couplings and nozzles
- Refinery low-severity hot process lines
- Turbine auxiliary steam lines
Advantages
- Ductile — tolerates forming and impact — 34%, better than 97% of steel grades
- High service temperature — 540°C (1,004 °F), better than 93% of steel grades
- Good corrosion resistance — 22/100, better than 90% of steel grades
- Easy to machine — 62/100, better than 89% of steel grades
- Readily welded — 72/100, better than 75% of steel grades
Limitations
- Low strength — 255 MPa (37 ksi), worse than 93% of steel grades
A369 FP2 properties
Typical room-temperature values for A369 FP2-ANN; bars are the position among steel grades.
Physical3
A369 FP2 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,490°C (2,714 °F).
Mechanical14
A369 FP2 has a yield strength of 255 MPa (37 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 93% of steel grades. Elongation at break is 34% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
A369 FP2 is rated for continuous service to 540°C (1,004 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical2
A369 FP2 has an electrical resistivity of 2.2×10⁻⁷ Ω·m.
Chemical & Environmental3
Corrosion resistance is poor (22/100), better than 90% of steel grades.
Sustainability4
Producing a kilogram of A369 FP2 takes about 26 MJ of energy and emits 2 kg of CO₂ — less than 64% of steel grades. Typical recycled content is 30%.
Manufacturability7
A369 FP2's machinability is good (62/100, better than 89% of steel grades); weldability very good (72/100); formability good (60/100).
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 FP2 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with A369 FP2
Is A369 FP2 easy to machine?
Machines like annealed low-alloy steel at ~60 % of AISI 1212; use rigid setups and positive-rake carbide for boring long pipe sections.
Can A369 FP2 be welded?
Weldable by SMAW/GTAW with matching 1.25Cr-0.5Mo or 0.5Cr-0.5Mo filler; preheat 150–200 °C and PWHT at 675–730 °C to avoid hard HAZ and hydrogen cracking.
Can A369 FP2 be formed, bent or molded?
Hot bend/form at 900–1050 °C followed by re-annealing or N+T; cold bending is possible for thin walls but springback and residual stress are high.
A369 FP2 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 | 0.1 – 0.2 | 0.15 |
| Mn | 0.3 – 0.61 | 0.45 |
| Si | 0.1 – 0.3 | 0.2 |
| Cr | 0.5 – 0.81 | 0.65 |
| Mo | 0.44 – 0.65 | 0.55 |
| P | ≤ 0.03 | |
| S | ≤ 0.03 | |
| Fe | balance |
What surface finishes work on A369 FP2?
No anodizing; protect with phosphate + high-temperature aluminium paint, aluminizing or insulation-compatible coatings, since bare surfaces oxidize above ~450 °C.
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 FP2 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- A335 P2
How much does A369 FP2 cost?
A369 FP2 is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
A369 FP2 — frequently asked
What is A369 FP2 used for?
A369 FP2 is typically used for moderate-temperature steam piping, header fittings, boiler feed and connecting piping, forged pipe couplings and nozzles, refinery low-severity hot process lines and turbine auxiliary steam lines. In short: leanest Cr-Mo pipe grade; best-machining A369 grade; easiest-welding Cr-Mo pipe.
What is the yield strength of A369 FP2?
A369 FP2 has a typical yield strength of 255 MPa (37 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 93% of steel grades. Strength varies by condition: see the 2 listed tempers.
Is A369 FP2 easy to machine?
Reasonably — machinability is rated good (62/100, better than 89% of steel grades). Machines like annealed low-alloy steel at ~60 % of AISI 1212; use rigid setups and positive-rake carbide for boring long pipe sections.
Can A369 FP2 be welded?
Yes — weldability is rated very good (72/100). Weldable by SMAW/GTAW with matching 1.25Cr-0.5Mo or 0.5Cr-0.5Mo filler; preheat 150–200 °C and PWHT at 675–730 °C to avoid hard HAZ and hydrogen cracking.
What surface finishes work on A369 FP2?
No anodizing; protect with phosphate + high-temperature aluminium paint, aluminizing or insulation-compatible coatings, since bare surfaces oxidize above ~450 °C.
Can A369 FP2 be formed, bent or molded?
Hot bend/form at 900–1050 °C followed by re-annealing or N+T; cold bending is possible for thin walls but springback and residual stress are high.
What is the maximum service temperature of A369 FP2?
A369 FP2 is rated for continuous use to about 540°C (1,004 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does A369 FP2 cost?
A369 FP2 is a standard-cost steel ($$), cheaper than about 71% 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 P2) — ASTM International (2022)
- ASME BPVC Section II Part D — Properties (Metric) — ASME (2023)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.13C — Corrosion: Environments and Industries — ASM International (2006)
- GB/T 5310 / GB/T 3077 (12CrMo, 15CrMo ) (2017)
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.