Steel P305GH
EN P305GH
A non-alloy carbon steel plate grade under EN 10273/10028 intended for boiler and pressure vessel components operating at elevated temperature, valued for guaranteed elevated-temperature strength and weldability.
Reference datasheet — P305GH 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 condition
P305GH tempers and conditions
P305GH is supplied in 5 conditions, soft to hard. +N 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 soft condition for heavy machining or cold forming; must be re-normalized before pressure service. | 280 | 470 | 30 | 135 HB | 9.8 % IACS |
Normalized and tempered | Used for heavier forgings/bars where a stress-relieving temper follows normalizing; slightly lower strength, better toughness scatter. | 325 | 520 | 26 | 150 HB | 9.6 % IACS |
Hot rolled | Lowest-cost bar condition for non-critical or later-heat-treated parts; property scatter is wider and grain size is not guaranteed. | 330 | 545 | 22 | 160 HB | 9.6 % IACS |
+NDefault Normalized | Standard supply condition for pressure bars, plate and forgings; fine grain, guaranteed 305 MPa yield and 27 J CVN. | 340 | 540 | 24 | 155 HB | — |
Quenched and tempered | Chosen for thick-section forgings (flanges, valve bodies) where through-thickness yield and toughness must be held at the top of the band. | 380 | 570 | 24 | 170 HB | 9.6 % IACS |
What is P305GH?
A non-alloy carbon steel plate grade under EN 10273/10028 intended for boiler and pressure vessel components operating at elevated temperature, valued for guaranteed elevated-temperature strength and weldability. P305GH has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F). P305GH has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 76% of steel grades. Elongation at break is 24% and the elastic modulus is 212 GPa (30.7 Msi).
What is P305GH used for?
- boiler drums
- pressure vessel shells
- steam piping flanges
- heat exchanger components
Advantages
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
- Readily welded — 85/100, better than 83% of steel grades
- Tough — resists crack growth — 120 MPa·√m (109.2 ksi·√in), better than 81% of steel grades
- Forms and bends easily — 65/100, better than 81% of steel grades
- Conducts heat well — 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
- Low strength — 340 MPa (49.3 ksi), worse than 76% of steel grades
P305GH properties
Typical room-temperature values for P305GH-+N; bars are the position among steel grades.
Physical3
P305GH has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F).
Mechanical16
P305GH has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 76% of steel grades. Elongation at break is 24% and the elastic modulus is 212 GPa (30.7 Msi).
Thermal6
P305GH is rated for continuous service to 400°C (752 °F). It conducts heat at 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
P305GH conducts electricity at 9.6 % IACS, better than 78% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of P305GH takes about 25 MJ of energy and emits 1.9 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 25%.
Manufacturability7
P305GH's machinability is good (60/100, better than 83% of steel grades); weldability excellent (85/100); formability good (65/100).
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. P305GH is highlighted; hover a dot for its name, or open the interactive family chart.
Working with P305GH
Is P305GH easy to machine?
Machines like a normalized C-Mn steel (~60 % of AISI 1212); low sulphur means stringy chips — use positive-rake carbide, generous feed and coolant to avoid built-up edge.
Can P305GH be welded?
Readily welded by SMAW/SAW/GTAW/GMAW with matching C-Mn consumables; CEV ≈ 0.40–0.45 so preheat 100–150 °C above ~30 mm and apply PWHT 580–620 °C per code.
Can P305GH be formed, bent or molded?
Hot form 850–1050 °C followed by re-normalizing; cold bending is possible with generous radii (≥2t) but heavy cold work should be normalized out before pressure service.
P305GH 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 |
|---|---|---|
| Cladle analysis | ≤ 0.22 | 0.18 |
| Si | 0.1 – 0.4 | 0.3 |
| Mn | 0.9 – 1.5 | 1.2 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.02 | 0.01 |
| Altotal Al, grain refining | ≥ 0.02 | 0.03 |
| Crresidual | ≤ 0.3 | 0.1 |
| Curesidual | ≤ 0.3 | 0.1 |
| Moresidual | ≤ 0.08 | 0.02 |
| Niresidual | ≤ 0.3 | 0.1 |
| Nb | ≤ 0.02 | |
| Ti | ≤ 0.03 | |
| V | ≤ 0.02 | |
| N | ≤ 0.01 | 0.01 |
| Fe | balance |
What surface finishes work on P305GH?
No anodizing; shot-blast then zinc-rich primer, epoxy paint, hot-dip galvanizing or corrosion allowance — bare surfaces rust quickly in humid service.
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 P305GH in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.0436
How much does P305GH cost?
P305GH is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
P305GH — frequently asked
What is P305GH used for?
P305GH is typically used for boiler drums, pressure vessel shells, steam piping flanges and heat exchanger components. In short: higher-strength pressure vessel steel; code elevated-temperature service; preheat needed on thick sections.
What is the yield strength of P305GH?
P305GH has a typical yield strength of 340 MPa (49.3 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 76% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is P305GH easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machines like a normalized C-Mn steel (~60 % of AISI 1212); low sulphur means stringy chips — use positive-rake carbide, generous feed and coolant to avoid built-up edge.
Can P305GH be welded?
Yes — weldability is rated excellent (85/100). Readily welded by SMAW/SAW/GTAW/GMAW with matching C-Mn consumables; CEV ≈ 0.40–0.45 so preheat 100–150 °C above ~30 mm and apply PWHT 580–620 °C per code.
What surface finishes work on P305GH?
No anodizing; shot-blast then zinc-rich primer, epoxy paint, hot-dip galvanizing or corrosion allowance — bare surfaces rust quickly in humid service.
Can P305GH be formed, bent or molded?
Hot form 850–1050 °C followed by re-normalizing; cold bending is possible with generous radii (≥2t) but heavy cold work should be normalized out before pressure service.
What is the maximum service temperature of P305GH?
P305GH is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does P305GH cost?
P305GH is a budget-cost steel ($), cheaper than about 90% 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
- EN 10273 — Hot rolled weldable steel bars for pressure purposes with specified elevated temperature properties — CEN (2016)
- EN 10222-2 — Steel forgings for pressure purposes: ferritic and martensitic steels with specified elevated temperature properties — CEN (2021)
- EN 10028-2 — Flat products made of steels for pressure purposes: non-alloy and alloy steels with specified elevated temperature properties — CEN (2017)
- EN 10027-2 / CR 10260 — Steel numbering system (1.0436) — CEN (2015)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.19 — Fatigue and Fracture — ASM International (1996)
- EN 1011-2 — Welding recommendations for ferritic steels — CEN (2001)
- Mysteel / SMM (2025)
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.