Steel P285QH
EN P285QH
P285QH (1.0478) is a non-alloy quenched-and-tempered fine-grain pressure vessel steel to EN 10028-2, cross-referenced to Q245R and supplied in QT, QT+SR, N and Z35 through-thickness qualities.
Reference datasheet — P285QH 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 QT condition
P285QH tempers and conditions
P285QH is supplied in 3 conditions, soft to hard. QT 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 |
|---|---|---|---|---|---|---|
quenched, tempered and stress relieved / simulated PWHT | Choose when the vessel will see one or more post-weld heat treatments (typically 550–620 °C) and the purchaser requires simulated-PWHT test coupons. | 305 | 445 | 28 | 135 HB | 10 % IACS |
Normalized | Normalized plate meeting the same 285 MPa class; used for thinner plate or when the mill/purchaser prefers the normalized route (cross-order with P285NH / Q245R). | 310 | 450 | 28 | 135 HB | 10 % IACS |
QTDefault Quenched and tempered | Standard mill delivery condition for P285QH plate; use for general pressure-vessel shells, heads and boiler drums. | 320 | 460 | 27 | 140 HB | 10 % IACS |
Supply forms, finishes and certifications
Ways P285QH is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
Z35 | Through-thickness (Z-quality) tested plate per EN 10164 | Certification |
What is P285QH?
P285QH (1.0478) is a non-alloy quenched-and-tempered fine-grain pressure vessel steel to EN 10028-2, cross-referenced to Q245R and supplied in QT, QT+SR, N and Z35 through-thickness qualities. It provides 320 MPa yield, 460 MPa tensile, 27 % elongation and about 140 HB with defined elevated-temperature strength up to 400 °C service, which suits code-built shells, drums and exchangers. The steel has no corrosion resistance and requires blasting plus coating or stainless cladding on aggressive process sides. Normalized P285NH is the equivalent when QT plate is not available. P285QH 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). P285QH has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 460 MPa (66.7 ksi) — weaker than 81% of steel grades. Elongation at break is 27% and the elastic modulus is 210 GPa (30.5 Msi).
What is P285QH used for?
- boiler drums
- pressure vessel shells
- heat exchangers
- storage tanks
Advantages
- Readily welded — 90/100, better than 90% of steel grades
- Tough — resists crack growth — 130 MPa·√m (118.3 ksi·√in), better than 89% of steel grades
- Forms and bends easily — 72/100, better than 88% of steel grades
- Ductile — tolerates forming and impact — 27%, better than 86% of steel grades
- High electrical conductivity — 10 % IACS, 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 81% of steel grades
P285QH properties
Typical room-temperature values for P285QH-QT; bars are the position among steel grades.
Physical3
P285QH 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
P285QH has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 460 MPa (66.7 ksi) — weaker than 81% of steel grades. Elongation at break is 27% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
P285QH 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
P285QH 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 P285QH takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 25%.
Manufacturability6
P285QH's machinability is good (60/100, better than 83% of steel grades); weldability excellent (90/100); formability very good (72/100).
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. P285QH is highlighted; hover a dot for its name, or open the interactive family chart.
Working with P285QH
Is P285QH easy to machine?
Machines like ordinary C-Mn plate steel (~65 % of AISI 1212); use sharp carbide tooling and generous feed to break the gummy chip, drill edge preparations without difficulty.
Can P285QH be welded?
Excellent weldability with SAW/SMAW/GMAW at CEV ≈ 0.40; use low-hydrogen consumables, preheat 50–150 °C for heavy sections and PWHT at 550–620 °C per EN 13445/AD 2000.
Can P285QH be formed, bent or molded?
Readily cold rolled into shells and cold/hot dished into heads; keep bend radius ≥ 2t cold, and re-normalize or re-QT after hot forming above ~580 °C.
P285QH 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 | ≤ 0.18 | 0.14 |
| Si | ≤ 0.4 | 0.25 |
| Mn | 0.6 – 1.4 | 1.1 |
| P | ≤ 0.03 | 0.01 |
| S | ≤ 0.01 | 0 |
| Altotal Al, fully killed / fine grain | ≥ 0.02 | 0.04 |
| Cr | ≤ 0.3 | 0.05 |
| Cu | ≤ 0.3 | 0.08 |
| Mo | ≤ 0.08 | 0.02 |
| Ni | ≤ 0.5 | 0.1 |
| Nb | ≤ 0.05 | 0.02 |
| Ti | ≤ 0.03 | 0.01 |
| V | ≤ 0.05 | 0.01 |
| N | ≤ 0.01 | 0.01 |
| Fe | balance |
What surface finishes work on P285QH?
Shot blast to Sa 2½ and paint or metallize — the steel has no inherent corrosion resistance; weld overlay or roll-bonded stainless cladding is common for aggressive process sides.
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 P285QH in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.047810028-2
- Similar grades
- Q245R
How much does P285QH cost?
P285QH 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.
P285QH — frequently asked
What is P285QH used for?
P285QH is typically used for boiler drums, pressure vessel shells, heat exchangers and storage tanks. In short: quenched-and-tempered vessel plate; Q245R cross-reference; Z35 through-thickness available.
What is the yield strength of P285QH?
P285QH has a typical yield strength of 320 MPa (46.4 ksi) and a tensile strength of 460 MPa (66.7 ksi) — weaker than 81% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is P285QH easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machines like ordinary C-Mn plate steel (~65 % of AISI 1212); use sharp carbide tooling and generous feed to break the gummy chip, drill edge preparations without difficulty.
Can P285QH be welded?
Yes — weldability is rated excellent (90/100). Excellent weldability with SAW/SMAW/GMAW at CEV ≈ 0.40; use low-hydrogen consumables, preheat 50–150 °C for heavy sections and PWHT at 550–620 °C per EN 13445/AD 2000.
What surface finishes work on P285QH?
Shot blast to Sa 2½ and paint or metallize — the steel has no inherent corrosion resistance; weld overlay or roll-bonded stainless cladding is common for aggressive process sides.
Can P285QH be formed, bent or molded?
Readily cold rolled into shells and cold/hot dished into heads; keep bend radius ≥ 2t cold, and re-normalize or re-QT after hot forming above ~580 °C.
What is the maximum service temperature of P285QH?
P285QH 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.
What is the difference between P285QH-QT and P285QH-N?
QT is the default condition — standard mill delivery condition for P285QH plate; use for general pressure-vessel shells, heads and boiler drums. N: normalized plate meeting the same 285 MPa class; used for thinner plate or when the mill/purchaser prefers the normalized route (cross-order with P285NH / Q245R). Yield strength is 320 MPa in QT versus 310 MPa in N.
How much does P285QH cost?
P285QH 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 10028-2 Flat products made of steels for pressure purposes — Non-alloy and alloy steels with specified elevated temperature properties — CEN (2017)
- EN 10164 Steel products with improved deformation properties perpendicular to the surface — CEN (2018)
- GB/T 713 Steel plates for boilers and pressure vessels (Q245R) — SAC (2014)
- ASM Handbook Vol.1: Properties and Selection — Irons, Steels and High-Performance Alloys — ASM International (1990)
- EN 13445-2/-3 Unfired pressure vessels — Materials and Design — CEN (2021)
- Mysteel / 1688 (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.