Steel 10CrMo9-10
EN 10CrMo9-10 · ASTM A335 P22
10CrMo9-10 (1.7380, A335 P22) is the classic 2.25 % Cr–1 % Mo heat-resistant steel of the EN Cr-Mo family, available as seamless tube, pipe, plate, bar and forgings in +A, +NT and +QT.
Reference datasheet — 10CrMo9-10 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 +NT condition
10CrMo9-10 tempers and conditions
10CrMo9-10 is supplied in 3 conditions, soft to hard. +NT 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 |
|---|---|---|---|---|---|---|
Annealed | Softest condition, supplied for heavy machining, deep forming or forging stock before final +NT/+QT treatment. | 280 | 470 | 28 | 145 HB | — |
+NTDefault Normalized and tempered | The standard delivery condition for boiler tube, header and pressure-vessel plate; balanced creep strength, toughness and weldability. | 360 | 545 | 24 | 165 HB | — |
Quenched and tempered | Chosen for thick-wall vessels, forgings and hydroprocessing reactor sections needing higher room-temperature strength and through-thickness toughness. | 460 | 650 | 20 | 19 HRC | — |
What is 10CrMo9-10?
10CrMo9-10 (1.7380, A335 P22) is the classic 2.25 % Cr–1 % Mo heat-resistant steel of the EN Cr-Mo family, available as seamless tube, pipe, plate, bar and forgings in +A, +NT and +QT. It is specified for power-boiler and refinery pressure parts to about 570 °C, with 360 MPa yield, 545 MPa tensile, 24 % elongation and roughly 165 HB (85 HRB), and it has the best weldability in this group (score 60) under code procedures. Preheat and 690–750 °C PWHT are mandatory, machinability is moderate (55), and corrosion resistance is low (15) — bare steel rusts cold and scales hot, so coating and corrosion-under-insulation control are required. 10CrMo9-10 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,450°C (2,642 °F). 10CrMo9-10 has a yield strength of 360 MPa (52.2 ksi) and a tensile strength of 545 MPa (79 ksi) — weaker than 72% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi).
What is 10CrMo9-10 used for?
- boiler tubes
- reheater/superheater tubing
- refinery piping
Advantages
- Tough — resists crack growth — 150 MPa·√m (136.5 ksi·√in), better than 96% of steel grades
- High service temperature — 570°C (1,058 °F), better than 96% of steel grades
10CrMo9-10 properties
Typical room-temperature values for 10CrMo9-10-+NT; bars are the position among steel grades.
Physical3
10CrMo9-10 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,450°C (2,642 °F).
Mechanical16
10CrMo9-10 has a yield strength of 360 MPa (52.2 ksi) and a tensile strength of 545 MPa (79 ksi) — weaker than 72% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
10CrMo9-10 is rated for continuous service to 570°C (1,058 °F). It conducts heat at 37 W/m·K (21.4 BTU/hr·ft·°F), worse than 71% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
10CrMo9-10 conducts electricity at 8 % IACS, better than 55% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (15/100), better than 75% of steel grades.
Sustainability4
Producing a kilogram of 10CrMo9-10 takes about 31 MJ of energy and emits 2.3 kg of CO₂ — more than 64% of steel grades. Typical recycled content is 25%.
Manufacturability7
10CrMo9-10's machinability is good (55/100, better than 62% of steel grades); weldability good (60/100); formability good (55/100).
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. 10CrMo9-10 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 10CrMo9-10
Is 10CrMo9-10 easy to machine?
Machines like 4130/4140 at ~55 % of 1212; use rigid setups, coated carbide, moderate speeds and generous coolant — bainitic +QT material work-hardens and loads tools faster.
Can 10CrMo9-10 be welded?
P-No.5A: preheat 200–250 °C, maintain interpass, use matching 2.25Cr-1Mo consumables (E9018-B3 / ER90S-B3) and mandatory PWHT at 690–750 °C to restore toughness and avoid hydrogen cracking.
Can 10CrMo9-10 be formed, bent or molded?
Hot bending/forging at 1050–1150 °C followed by re-normalizing and tempering is preferred; cold bending is possible on tube with generous radii but needs stress-relief afterwards.
10CrMo9-10 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 | 0.08 – 0.14 | 0.11 |
| Si | ≤ 0.5 | 0.25 |
| Mn | 0.4 – 0.8 | 0.55 |
| Plower P specified for temper-embrittlement-resistant (J-factor) grades | ≤ 0.02 | 0.01 |
| S | ≤ 0.01 | 0.01 |
| Cr | 2 – 2.5 | 2.25 |
| Mo | 0.9 – 1.1 | 1 |
| Niresidual | ≤ 0.3 | 0.15 |
| Curesidual | ≤ 0.3 | 0.1 |
| Fe | balance |
What surface finishes work on 10CrMo9-10?
No anodizing; protect with high-temperature aluminium-silicone paint, phosphate or metallizing, and control corrosion under insulation in cyclic 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 10CrMo9-10 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- A335 P22
- EN / DIN / Werkstoff-Nr.
- 1.7380
How much does 10CrMo9-10 cost?
10CrMo9-10 is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
10CrMo9-10 — frequently asked
What is 10CrMo9-10 used for?
10CrMo9-10 is typically used for boiler tubes, reheater/superheater tubing and refinery piping. In short: most weldable Cr-Mo here; standard boiler tube steel; 570 °C service limit.
What is the yield strength of 10CrMo9-10?
10CrMo9-10 has a typical yield strength of 360 MPa (52.2 ksi) and a tensile strength of 545 MPa (79 ksi) — weaker than 72% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is 10CrMo9-10 easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Machines like 4130/4140 at ~55 % of 1212; use rigid setups, coated carbide, moderate speeds and generous coolant — bainitic +QT material work-hardens and loads tools faster.
Can 10CrMo9-10 be welded?
Yes — weldability is rated good (60/100). P-No.5A: preheat 200–250 °C, maintain interpass, use matching 2.25Cr-1Mo consumables (E9018-B3 / ER90S-B3) and mandatory PWHT at 690–750 °C to restore toughness and avoid hydrogen cracking.
What surface finishes work on 10CrMo9-10?
No anodizing; protect with high-temperature aluminium-silicone paint, phosphate or metallizing, and control corrosion under insulation in cyclic service.
Can 10CrMo9-10 be formed, bent or molded?
Hot bending/forging at 1050–1150 °C followed by re-normalizing and tempering is preferred; cold bending is possible on tube with generous radii but needs stress-relief afterwards.
What is the maximum service temperature of 10CrMo9-10?
10CrMo9-10 is rated for continuous use to about 570°C (1,058 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 10CrMo9-10 cost?
10CrMo9-10 is a standard-cost steel ($$), 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 steel tubes with specified elevated temperature properties — CEN (2020)
- EN 10028-2 Flat products made of steels for pressure purposes — Alloy steels with specified elevated temperature properties — CEN (2017)
- ASTM A335/A335M Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service (Grade P22) — ASTM (2023)
- ASTM A387/A387M Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum (Grade 22) — ASTM (2021)
- ASME BPVC Section II Part D — Material Properties — ASME (2023)
- ASM Handbook Vol. 1: Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- API RP 941 Steels for Hydrogen Service at Elevated Temperatures — API (2016)
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.