Steel A369 Grade FPA
ASTM A369 Grade FPA
A369 Grade FPA is a low-carbon, forged and bored carbon-steel pipe grade in the ASTM A369 family, supplied normalized, normalized-and-tempered or annealed for high-temperature, high-pressure central-station service.
Reference datasheet — A369 Grade FPA 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 Grade FPA tempers and conditions
A369 Grade FPA is supplied in 3 conditions, soft to hard. N+T is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Softest permitted A369 condition; choose for maximum machinability, cold bending and lowest residual stress in heavy-wall bored pipe. | 230 | 390 | 38 | 112 HB | — |
N+TDefault Normalized and tempered | Standard supply condition for FPA forged-and-bored pipe: uniform fine ferrite-pearlite with good toughness for boiler/steam header service. | 250 | 415 | 35 | 120 HB | — |
Normalized | Normalize-only condition where slightly higher strength and refined grain are wanted and tempering is not required by the purchaser. | 265 | 430 | 33 | 130 HB | 10 % IACS |
Supply forms, finishes and certifications
Ways A369 Grade FPA 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 Grade FPA?
A369 Grade FPA is a low-carbon, forged and bored carbon-steel pipe grade in the ASTM A369 family, supplied normalized, normalized-and-tempered or annealed for high-temperature, high-pressure central-station service. Engineers choose it for steam headers and boiler piping because it combines easy fabrication with a weldability score of 92, at 250 MPa yield, 415 MPa tensile, 35 % elongation and 120 HB (68 HRB). Service is capped at 425 °C and the steel has no inherent corrosion resistance, so coatings and insulation detailing are required. Where higher allowable stress is needed, A369 Grade FPB is the direct step up. A369 Grade FPA has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,495°C (2,723 °F). A369 Grade FPA has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 415 MPa (60.2 ksi) — weaker than 94% of steel grades. Elongation at break is 35% and the elastic modulus is 200 GPa (29 Msi).
What is A369 Grade FPA used for?
- Boiler steam piping
- High-temperature pressure pipe
- Power plant headers
Advantages
- Conducts heat well — 52 W/m·K (30 BTU/hr·ft·°F), better than 98% of steel grades
- Ductile — tolerates forming and impact — 35%, better than 97% of steel grades
- Easy to machine — 65/100, better than 93% of steel grades
- Readily welded — 92/100, better than 93% of steel grades
- Forms and bends easily — 75/100, better than 90% of steel grades
Limitations
- Low strength — 250 MPa (36.3 ksi), worse than 94% of steel grades
A369 Grade FPA properties
Typical room-temperature values for A369 Grade FPA-N+T; bars are the position among steel grades.
Physical3
A369 Grade FPA has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,495°C (2,723 °F).
Mechanical16
A369 Grade FPA has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 415 MPa (60.2 ksi) — weaker than 94% of steel grades. Elongation at break is 35% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
A369 Grade FPA is rated for continuous service to 425°C (797 °F). It conducts heat at 52 W/m·K (30 BTU/hr·ft·°F), better than 98% of steel grades. Thermal expansion is 11.7 µm/m·K (6.5 µin/in·°F).
Electrical3
A369 Grade FPA conducts electricity at 10 % IACS, better than 83% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of A369 Grade FPA takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 25%.
Manufacturability8
A369 Grade FPA's machinability is good (65/100, better than 93% of steel grades); weldability excellent (92/100); formability very good (75/100).
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 Grade FPA is highlighted; hover a dot for its name, or open the interactive family chart.
Working with A369 Grade FPA
Is A369 Grade FPA easy to machine?
Free-machining is not present, but low carbon means easy turning/boring at ~65 % of AISI 1212; use positive rake and good chip control to avoid stringy chips in annealed material.
Can A369 Grade FPA be welded?
Excellent weldability (CE ≈ 0.35); SMAW/GTAW with E7018 or ER70S-2, preheat 100–150 °C for walls above ~30 mm and PWHT per ASME B31.1 for heavy sections.
Can A369 Grade FPA be formed, bent or molded?
Hot bend or hot form above 900 °C for heavy-wall pipe, then re-heat-treat; cold bending is possible in the annealed condition with generous radii.
A369 Grade FPA 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 |
|---|---|---|
| CASTM A369 Grade FPA | ≤ 0.25 | 0.2 |
| Mn | 0.27 – 0.93 | 0.6 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.04 | 0.02 |
| Si0.10 % minimum, no maximum specified | ≥ 0.1 | 0.2 |
| Fe | balance |
What surface finishes work on A369 Grade FPA?
No anodizing; protect with shop primer, aluminium metallizing or high-temperature silicone paint, and insulate to avoid corrosion-under-insulation.
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 Grade FPA in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- A369 FPA
How much does A369 Grade FPA cost?
A369 Grade FPA 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 Grade FPA — frequently asked
What is A369 Grade FPA used for?
A369 Grade FPA is typically used for boiler steam piping, high-temperature pressure pipe and power plant headers. In short: most weldable A369 grade; lowest-strength A369 pipe; easy-boring forged pipe.
What is the yield strength of A369 Grade FPA?
A369 Grade FPA has a typical yield strength of 250 MPa (36.3 ksi) and a tensile strength of 415 MPa (60.2 ksi) — weaker than 94% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is A369 Grade FPA easy to machine?
Reasonably — machinability is rated good (65/100, better than 93% of steel grades). Free-machining is not present, but low carbon means easy turning/boring at ~65 % of AISI 1212; use positive rake and good chip control to avoid stringy chips in annealed material.
Can A369 Grade FPA be welded?
Yes — weldability is rated excellent (92/100). Excellent weldability (CE ≈ 0.35); SMAW/GTAW with E7018 or ER70S-2, preheat 100–150 °C for walls above ~30 mm and PWHT per ASME B31.1 for heavy sections.
What surface finishes work on A369 Grade FPA?
No anodizing; protect with shop primer, aluminium metallizing or high-temperature silicone paint, and insulate to avoid corrosion-under-insulation.
Can A369 Grade FPA be formed, bent or molded?
Hot bend or hot form above 900 °C for heavy-wall pipe, then re-heat-treat; cold bending is possible in the annealed condition with generous radii.
What is the maximum service temperature of A369 Grade FPA?
A369 Grade FPA is rated for continuous use to about 425°C (797 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between A369 Grade FPA N+T and A369 Grade FPA-ANN?
N+T is the default condition — standard supply condition for FPA forged-and-bored pipe: uniform fine ferrite-pearlite with good toughness for boiler/steam header service. ANN: softest permitted A369 condition; choose for maximum machinability, cold bending and lowest residual stress in heavy-wall bored pipe. Yield strength is 250 MPa in N+T versus 230 MPa in ANN.
How much does A369 Grade FPA cost?
A369 Grade FPA 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)
- ASME BPVC Section II Part D — Properties (Metric) — ASME (2023)
- ASME B31.1 Power Piping — ASME (2022)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Machinery's Handbook, 31st ed. — Industrial Press (2020)
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.