Steel P355GH · temper
Steel P355GH Annealed
Properties of the Annealed condition, compared with the other P355GH tempers.
Choose for maximum softness and dimensional stability before heavy cold forming or machining; strength drops toward the spec minimum.
What is P355GH Annealed?
P355GH Annealed is P355GH in the Annealed temper — choose for maximum softness and dimensional stability before heavy cold forming or machining; strength drops toward the spec minimum. P355GH Annealed has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 80% of steel grades. Elongation at break is 30% and the elastic modulus is 210 GPa (30.5 Msi). P355GH Annealed 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). HR is the default condition FabDigit quotes; Annealed is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 30%, better than 92% of steel grades
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
- Forms and bends easily — 78/100, better than 91% of steel grades
- Easy to machine — 60/100, better than 83% of steel grades
- Readily welded — 85/100, better than 83% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
- Low strength — 320 MPa (46.4 ksi), worse than 80% of steel grades
P355GH Annealed properties
Typical room-temperature values for P355GH Annealed — 8 properties are specific to this condition; the rest are grade-level values shared by every P355GH temper. Each bar shows where the value sits among the steel grades in FabDigit's library — further right is higher.
Physical3
P355GH Annealed 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
P355GH Annealed has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 80% of steel grades. Elongation at break is 30% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
P355GH Annealed is rated for continuous service to 380°C (716 °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
P355GH Annealed conducts electricity at 8.2 % IACS, better than 60% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of P355GH Annealed 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
P355GH Annealed's machinability is good (60/100, better than 83% of steel grades); weldability excellent (85/100); formability very good (78/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other P355GH tempers and conditions
P355GH is also supplied in 4 other conditions. The full side-by-side table is on the P355GH overview.
- HRDefaultAs-rolled thin plate/strip where normalizing is waived by thickness or agreement; slightly coarser and less uniform properties than +N.385 MPa yield · 165 HB
- Q&TOptional accelerated-cooled/quenched and tempered route for thick plate or forged parts where higher through-thickness strength and toughness are agreed with the mill.450 MPa yield · 12 HRC
- NormalizedStandard supply condition for P355GH plate: uniform fine-grained ferrite-pearlite giving guaranteed ReH 355 MPa and RT impact energy for code vessels.390 MPa yield · 160 HB
- N&TNormalized then tempered/PWHT-simulated; used for heavy sections and post-weld heat-treated vessels needing stable elevated-temperature properties.375 MPa yield · 155 HB
- AnnealedChoose for maximum softness and dimensional stability before heavy cold forming or machining; strength drops toward the spec minimum.320 MPa yield · 140 HB
Working with P355GH Annealed
Is P355GH easy to machine?
Machines like ordinary C-Mn plate steel at ~65 % of AISI 1212; use rigid setups and coated carbide, watch for gummy chips at low Mn-S levels.
Can P355GH be welded?
Very good weldability by SMAW/SAW/GMAW with matching low-hydrogen consumables; preheat 100–150 °C for t >30 mm or high restraint, PWHT 550–620 °C per EN 13445/AD 2000.
Can P355GH be formed, bent or molded?
Cold forms and rolls readily to about 3t bend radius; hot form 850–1000 °C followed by re-normalizing to restore certified properties.
What surface finishes work on P355GH?
No anodizing — shot-blast to Sa 2½ and paint, metallize or hot-dip galvanize; internal surfaces usually run with a corrosion allowance or weld overlay.
P355GH 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, EN 10028-2 | ≤ 0.2 | 0.16 |
| Si | ≤ 0.6 | 0.35 |
| Mn | 1.1 – 1.7 | 1.4 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.02 | 0.01 |
| Altotal Al | ≥ 0.02 | 0.03 |
| Cr | ≤ 0.3 | 0.1 |
| Cu | ≤ 0.3 | 0.1 |
| Mo | ≤ 0.08 | 0.02 |
| Ni | ≤ 0.3 | 0.1 |
| Nb | ≤ 0.05 | 0.01 |
| Ti | ≤ 0.03 | 0.01 |
| VNb+Ti+V ≤ 0.05 total | ≤ 0.02 | 0.01 |
| N | ≤ 0.01 | 0.01 |
| Fe | balance | — |
P355GH Annealed — frequently asked
What is P355GH Annealed used for?
P355GH Annealed is typically used for welded boiler drums, pressure vessel shells and heads, heat exchanger shells, steam headers and piping components, air receivers and storage tanks and autoclave bodies. In short: european boiler-plate steel.
What is the yield strength of P355GH Annealed?
P355GH Annealed has a typical yield strength of 320 MPa (46.4 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 80% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is P355GH Annealed easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machines like ordinary C-Mn plate steel at ~65 % of AISI 1212; use rigid setups and coated carbide, watch for gummy chips at low Mn-S levels.
Can P355GH Annealed be welded?
Yes — weldability is rated excellent (85/100). Very good weldability by SMAW/SAW/GMAW with matching low-hydrogen consumables; preheat 100–150 °C for t >30 mm or high restraint, PWHT 550–620 °C per EN 13445/AD 2000.
What surface finishes work on P355GH Annealed?
No anodizing — shot-blast to Sa 2½ and paint, metallize or hot-dip galvanize; internal surfaces usually run with a corrosion allowance or weld overlay.
Can P355GH Annealed be formed, bent or molded?
Cold forms and rolls readily to about 3t bend radius; hot form 850–1000 °C followed by re-normalizing to restore certified properties.
What is the maximum service temperature of P355GH Annealed?
P355GH Annealed is rated for continuous use to about 380°C (716 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in P355GH Annealed?
Yes — P355GH Annealed is available for CNC machining and sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- EN 10028-2 Flat products made of steels for pressure purposes — Part 2: Non-alloy and alloy steels with specified elevated temperature properties — CEN (2017)
- EN 10027-2 / material number 1.0473 — CEN (2015)
- EN 13445-2/-3 Unfired pressure vessels — materials and design — CEN (2021)
- 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)
- Pressure vessel plate P355GH data sheets (Dillinger / voestalpine / Ancofer) — mill datasheets (2022)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.