Steel 7CrWVMoNb9-6
EN 7CrWVMoNb9-6
7CrWVMoNb9-6 (1.8201) is a low-alloy chromium-tungsten-vanadium-niobium creep-resisting steel supplied under EN 10250/10083, with W, V and Nb providing precipitation strengthening at temperature.
Reference datasheet — 7CrWVMoNb9-6 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
7CrWVMoNb9-6 tempers and conditions
7CrWVMoNb9-6 is supplied in 5 conditions, soft to hard. N+T 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 |
|---|---|---|---|---|---|---|
Solution annealed | Choose for bar or forging stock that will be machined or cold worked and then re-normalized and tempered before service. | 320 | 500 | 28 | 155 HB | 7.5 % IACS |
N+TDefault Normalized and tempered | Standard delivery condition for T23/P23 seamless boiler tube, pipe and plate; gives the tempered-bainite structure the creep data are based on. | 470 | 600 | 24 | 190 HB | — |
As-welded deposit | Condition of membrane-wall and superheater tube welds erected without PWHT — permitted for thin walls, but HAZ hardness and reheat-crack risk must be checked. | 480 | 620 | 18 | 29 HRC | 7.2 % IACS |
Cold drawn tube, then normalized and tempered | Small-diameter, close-tolerance superheater tubing: cold drawn for dimensional accuracy and then given the full N+T cycle to restore creep properties. | 480 | 610 | 23 | 12 HRC | 7.2 % IACS |
Quenched and tempered | Used for thick-wall headers, plate and forgings where air cooling would not give full bainite; slightly higher strength, similar creep behaviour. | 520 | 650 | 21 | 17 HRC | 7.2 % IACS |
What is 7CrWVMoNb9-6?
7CrWVMoNb9-6 (1.8201) is a low-alloy chromium-tungsten-vanadium-niobium creep-resisting steel supplied under EN 10250/10083, with W, V and Nb providing precipitation strengthening at temperature. It is used for high-temperature, high-strength forged components such as bolting, and is available in N+T, Q+T, A, AW and CD+NT conditions; typical values are 470 MPa yield, 600 MPa tensile, 24 % elongation and about 190 HB with service to 580 °C. It welds better than the spring and quench-hardening grades (weldability score 60) but still needs preheat and PWHT and is sensitive to reheat cracking in restrained joints. Where 580 °C capability is not needed, 2.25Cr-1Mo is the more available and lower-cost substitute. 7CrWVMoNb9-6 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,465°C (2,669 °F). 7CrWVMoNb9-6 has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 57% of steel grades. Elongation at break is 24% and the elastic modulus is 213 GPa (30.9 Msi).
What is 7CrWVMoNb9-6 used for?
- High-temperature bolts
- Turbine fasteners
- Pressure vessel components
- Heavy forgings
Advantages
- High service temperature — 580°C (1,076 °F), better than 97% of steel grades
- Tough — resists crack growth — 130 MPa·√m (118.3 ksi·√in), better than 89% of steel grades
Limitations
- Poor heat conductor — 30 W/m·K (17.3 BTU/hr·ft·°F), worse than 83% of steel grades
7CrWVMoNb9-6 properties
Typical room-temperature values for 7CrWVMoNb9-6-N+T; bars are the position among steel grades.
Physical3
7CrWVMoNb9-6 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,465°C (2,669 °F).
Mechanical16
7CrWVMoNb9-6 has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 57% of steel grades. Elongation at break is 24% and the elastic modulus is 213 GPa (30.9 Msi).
Thermal6
7CrWVMoNb9-6 is rated for continuous service to 580°C (1,076 °F). It conducts heat at 30 W/m·K (17.3 BTU/hr·ft·°F), worse than 83% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical2
7CrWVMoNb9-6 has an electrical resistivity of 2.4×10⁻⁷ Ω·m.
Chemical & Environmental3
Corrosion resistance is poor (20/100), better than 87% of steel grades.
Sustainability4
Producing a kilogram of 7CrWVMoNb9-6 takes about 32 MJ of energy and emits 2.3 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 25%.
Manufacturability7
7CrWVMoNb9-6's machinability is fair (50/100, worse than 53% of steel grades); weldability good (60/100); formability fair (45/100).
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. 7CrWVMoNb9-6 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 7CrWVMoNb9-6
Is 7CrWVMoNb9-6 easy to machine?
Machines like tempered-bainite 2.25Cr-1Mo at roughly half the rate of free-cutting steel; use rigid setups, coated carbide, moderate speed and generous coolant, and machine in the annealed or N+T state.
Can 7CrWVMoNb9-6 be welded?
GTAW root plus SMAW/FCAW fill with matching 2.25Cr-1.6W-V-Nb consumables; preheat 150–200 °C, control interpass below ~300 °C, PWHT 730–760 °C for thick sections (thin tubes may be left as-welded) and avoid over-restrained joints because of reheat-cracking sensitivity.
Can 7CrWVMoNb9-6 be formed, bent or molded?
Hot form at 950–1100 °C and re-normalize/temper afterwards; cold tube bending is possible on thin walls but heavy cold work must be followed by a full N+T cycle.
7CrWVMoNb9-6 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 | 0.04 – 0.1 | 0.07 |
| Si | ≤ 0.5 | 0.25 |
| Mn | 0.1 – 0.6 | 0.45 |
| P | ≤ 0.03 | 0.01 |
| S | ≤ 0.01 | 0 |
| Cr | 1.9 – 2.6 | 2.25 |
| Mo | 0.05 – 0.3 | 0.15 |
| Wmain solid-solution strengthener | 1.45 – 1.75 | 1.6 |
| V | 0.2 – 0.3 | 0.25 |
| Nb | 0.02 – 0.08 | 0.05 |
| Bhardenability / creep | 5×10⁻⁴ – 0.01 | 0 |
| N | ≤ 0.03 | 0.01 |
| Altotal Al | ≤ 0.03 | 0.02 |
| Fe | balance |
What surface finishes work on 7CrWVMoNb9-6?
No anodizing; protect against wet corrosion with shop primer, high-temperature aluminium paint, or diffusion coatings (aluminizing/chromizing) where steam-side oxidation limits life.
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 7CrWVMoNb9-6 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.8201
How much does 7CrWVMoNb9-6 cost?
7CrWVMoNb9-6 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.
7CrWVMoNb9-6 — frequently asked
What is 7CrWVMoNb9-6 used for?
7CrWVMoNb9-6 is typically used for high-temperature bolts, turbine fasteners, pressure vessel components and heavy forgings. In short: creep strength to 580 °C; best-welding creep grade here; bolting-oriented Cr-W-V-Nb steel.
What is the yield strength of 7CrWVMoNb9-6?
7CrWVMoNb9-6 has a typical yield strength of 470 MPa (68.2 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 57% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is 7CrWVMoNb9-6 easy to machine?
Reasonably — machinability is rated fair (50/100, worse than 53% of steel grades). Machines like tempered-bainite 2.25Cr-1Mo at roughly half the rate of free-cutting steel; use rigid setups, coated carbide, moderate speed and generous coolant, and machine in the annealed or N+T state.
Can 7CrWVMoNb9-6 be welded?
Yes — weldability is rated good (60/100). GTAW root plus SMAW/FCAW fill with matching 2.25Cr-1.6W-V-Nb consumables; preheat 150–200 °C, control interpass below ~300 °C, PWHT 730–760 °C for thick sections (thin tubes may be left as-welded) and avoid over-restrained joints because of reheat-cracking sensitivity.
What surface finishes work on 7CrWVMoNb9-6?
No anodizing; protect against wet corrosion with shop primer, high-temperature aluminium paint, or diffusion coatings (aluminizing/chromizing) where steam-side oxidation limits life.
Can 7CrWVMoNb9-6 be formed, bent or molded?
Hot form at 950–1100 °C and re-normalize/temper afterwards; cold tube bending is possible on thin walls but heavy cold work must be followed by a full N+T cycle.
What is the maximum service temperature of 7CrWVMoNb9-6?
7CrWVMoNb9-6 is rated for continuous use to about 580°C (1,076 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 7CrWVMoNb9-6 N+T and 7CrWVMoNb9-6-A?
N+T is the default condition — standard delivery condition for T23/P23 seamless boiler tube, pipe and plate; gives the tempered-bainite structure the creep data are based on. A: choose for bar or forging stock that will be machined or cold worked and then re-normalized and tempered before service. Yield strength is 470 MPa in N+T versus 320 MPa in A.
How much does 7CrWVMoNb9-6 cost?
7CrWVMoNb9-6 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
- EN 10216-2 — Seamless steel tubes for pressure purposes, non-alloy and alloy steels with specified elevated temperature properties — CEN (2020)
- EN 10028-2 — Flat products of steels for pressure purposes: alloy steels with specified elevated temperature properties — CEN (2017)
- EN 10302 — Creep resisting steels, nickel and cobalt alloys — CEN (2008)
- ASTM A213/A213M Grade T23 and A335/A335M Grade P23 — ASTM International (2022)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Seamless boiler tube data for HCM2S / T23 grade — Nippon Steel / Vallourec (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.