Steel P92-HR (Hot rolled)
Supply condition · default condition
AISI/SAE P92 · EN X10CrWMoVNb9-2
As-hot-worked mill stock with uncontrolled, position-dependent properties; never acceptable for code pressure parts without normalizing and tempering.
Values for the HR condition
Other P92 tempers and conditions
P92 is listed in 5 conditions; see the grade overview at P92.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
subcritical/soft annealed ~730–780 °C, furnace cooled (machining or forming stock) | Softened condition for heavy machining or cold forming; the creep properties are only restored after a full re-normalize and temper. | 400 | 600 | 26 | 185 HB | — |
Normalized and tempered | The only condition allowed for pressure service — tempered martensite with fine MX/M23C6 precipitation giving the design creep strength. | 540 | 720 | 22 | 21 HRC | — |
Quenched and tempered | Used on thick forgings and castings where air cooling cannot fully harden the section; slightly higher strength than N&T at similar toughness. | 580 | 760 | 20 | 23 HRC | — |
HRDefaultThis page Hot rolled | As-hot-worked mill stock with uncontrolled, position-dependent properties; never acceptable for code pressure parts without normalizing and tempering. | 620 | 850 | 17 | 29 HRC | 2.8 % IACS |
normalized only, untempered martensite (intermediate process condition) | Process-only condition after air cooling from austenitizing — hard and brittle, must be tempered before any service or hydro test. | 900 | 1,250 | 12 | 43 HRC | — |
What is P92-HR?
P92-HR is P92 supplied in the HR condition — as-hot-worked mill stock with uncontrolled, position-dependent properties; never acceptable for code pressure parts without normalizing and tempering. P92-HR has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 850 MPa (123 ksi) — stronger than 78% of steel grades. Elongation at break is 17% and the elastic modulus is 216 GPa (31.3 Msi). P92-HR has a density of 7.78 g/cm³ (0.281 lb/in³), lighter than 91% of steel grades. It melts at 1,425°C (2,597 °F).
Advantages
- Good corrosion resistance — 28/100, better than 94% of steel grades
- High strength — 620 MPa (89.9 ksi), better than 78% of steel grades
Limitations
- Low electrical conductivity — 2.8 % IACS, worse than 94% of steel grades
- Difficult to machine — 28/100, worse than 91% of steel grades
- High embodied carbon — 2.6 kg CO₂/kg, worse than 87% of steel grades
- Poor heat conductor — 27 W/m·K (15.6 BTU/hr·ft·°F), worse than 86% of steel grades
- Limited formability — 20/100, worse than 80% of steel grades
P92-HR properties
Typical room-temperature values for P92-HR; 22 are specific to this condition. Other listed values are P92 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
P92-HR has a density of 7.78 g/cm³ (0.281 lb/in³), lighter than 91% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
P92-HR has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 850 MPa (123 ksi) — stronger than 78% of steel grades. Elongation at break is 17% and the elastic modulus is 216 GPa (31.3 Msi).
Thermal6
P92-HR is rated for continuous service to 400°C (752 °F). It conducts heat at 27 W/m·K (15.6 BTU/hr·ft·°F), worse than 86% of steel grades. Thermal expansion is 10.8 µm/m·K (6 µin/in·°F).
Electrical3
P92-HR conducts electricity at 2.8 % IACS, worse than 94% of steel grades.
Chemical & Environmental2
Corrosion resistance is poor (28/100), better than 94% of steel grades.
Sustainability4
Producing a kilogram of P92-HR takes about 36 MJ of energy and emits 2.6 kg of CO₂ — more than 89% of steel grades. Typical recycled content is 30%.
Manufacturability7
P92-HR's machinability is poor (28/100, worse than 91% of steel grades); weldability poor (30/100); formability poor (20/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with P92-HR
Is P92 easy to machine?
Machine in the N&T (≤250 HB) or annealed condition with rigid setups, coated carbide, moderate speed and heavy feed; the fine MX carbonitrides are abrasive and work-hardening is noticeable.
Can P92 be welded?
GTAW root / SMAW-FCAW fill with matching 9Cr-2W consumables, 200–250 °C preheat, interpass ≤300 °C, no interruption below preheat, mandatory PWHT 750–780 °C with careful hold time; watch Type IV cracking in the fine-grain HAZ and keep Ni+Mn low in filler.
Can P92 be formed, bent or molded?
Hot form at 1050–1150 °C followed by a full re-normalize and temper; cold bending is limited and any cold strain above a few percent should be re-heat-treated to restore creep strength.
What surface finishes work on P92?
Not stainless — protect with high-temperature aluminium/silicone paint, aluminizing or Cr-diffusion coating for steam-side oxidation and shot-blast/pickle before coating; anodizing is not applicable.
P92 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 | 0.07 – 0.13 | 0.1 |
| Si | ≤ 0.5 | 0.25 |
| Mn | 0.3 – 0.6 | 0.45 |
| P | ≤ 0.02 | 0.01 |
| S | ≤ 0.01 | 0 |
| Cr | 8.5 – 9.5 | 9 |
| W | 1.5 – 2 | 1.8 |
| Mo | 0.3 – 0.6 | 0.5 |
| V | 0.15 – 0.25 | 0.2 |
| Nb | 0.04 – 0.09 | 0.06 |
| N | 0.03 – 0.07 | 0.05 |
| B | 0 – 0.01 | 0 |
| Ni | ≤ 0.4 | 0.2 |
| Al | ≤ 0.02 | 0.01 |
| Ti | ≤ 0.01 | |
| Zr | ≤ 0.01 | |
| Fe | balance |
P92-HR — frequently asked
What is P92-HR used for?
P92-HR is typically used for ultra-supercritical main steam piping, hot reheat piping, boiler headers, high-temperature valve bodies, thick-wall forged fittings and superheater outlet tubing. In short: premium high-temp pipe.
What is the yield strength of P92-HR?
P92-HR has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 850 MPa (123 ksi) — stronger than 78% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is P92-HR easy to machine?
Not especially — machinability is rated poor (28/100, worse than 91% of steel grades). Machine in the N&T (≤250 HB) or annealed condition with rigid setups, coated carbide, moderate speed and heavy feed; the fine MX carbonitrides are abrasive and work-hardening is noticeable.
Can P92-HR be welded?
Not readily — weldability is rated poor (30/100). GTAW root / SMAW-FCAW fill with matching 9Cr-2W consumables, 200–250 °C preheat, interpass ≤300 °C, no interruption below preheat, mandatory PWHT 750–780 °C with careful hold time; watch Type IV cracking in the fine-grain HAZ and keep Ni+Mn low in filler.
What surface finishes work on P92-HR?
Not stainless — protect with high-temperature aluminium/silicone paint, aluminizing or Cr-diffusion coating for steam-side oxidation and shot-blast/pickle before coating; anodizing is not applicable.
Can P92-HR be formed, bent or molded?
Hot form at 1050–1150 °C followed by a full re-normalize and temper; cold bending is limited and any cold strain above a few percent should be re-heat-treated to restore creep strength.
What is the maximum service temperature of P92-HR?
P92-HR 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.
Can FabDigit make parts in P92-HR?
Yes — P92-HR is available for CNC machining and sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM A335/A335M — Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service (Grade P92) — ASTM International (2022)
- ASME BPVC Section II Part A, SA-335 / SA-182 F92 — ASME (2023)
- EN 10216-2 — Seamless steel tubes for pressure purposes, X10CrWMoVNb9-2 (1.4901) — CEN (2020)
- GB/T 5310 — (10Cr9MoW2VNbBN) — SAC (2017)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- VdTÜV-Werkstoffblatt 552 — X10CrWMoVNb9-2 physical and elevated-temperature data — VdTÜV (2015)
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.