Steel 15CrMo Annealed
Temper
GB 15CrMo · ASTM A335 Grade P11
Pick for maximum machinability and cold formability, or to soften after forging before final normalize-and-temper.
Values for the Annealed condition
Other 15CrMo tempers and conditions
15CrMo is listed in 7 conditions; see the grade overview at 15CrMo.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedThis page full/soft anneal, ≤179 HB | Pick for maximum machinability and cold formability, or to soften after forging before final normalize-and-temper. | 265 | 460 | 26 | 145 HB | — |
Normalized and tempered | Standard GB/T 3077 and GB 5310 supply condition for boiler tubes, headers and pressure plate — best balance of creep strength, toughness and weld compatibility. | 300 | 490 | 25 | 150 HB | — |
HRDefault Hot rolled | Most commonly stocked mill condition for 15CrMo plate, bar and seamless tube before final heat treatment or as-supplied for general pressure work. | 305 | 500 | 22 | 155 HB | — |
~900–930 °C air cool | Use to refine grain and homogenise forgings/plate; higher strength than annealed but usually followed by a temper for pressure service. | 340 | 525 | 22 | 165 HB | — |
Cold rolled | Thin strip/sheet condition for stamped heat-resistant parts and small tubing stock; usually annealed after forming. | 430 | 570 | 14 | 10 HRC | 7.7 % IACS |
Cold drawn | Pick for small-diameter bar needing tight tolerance, bright finish and higher yield strength without heat treatment. | 500 | 620 | 12 | 185 HB | — |
Quenched and tempered | Choose for high-temperature bolting, valve stems and shafts where higher yield strength and toughness than N&T are needed below ~500 °C. | 550 | 700 | 18 | 19 HRC | — |
What is 15CrMo Annealed?
15CrMo Annealed is 15CrMo in the Annealed temper — pick for maximum machinability and cold formability, or to soften after forging before final normalize-and-temper. 15CrMo Annealed has a yield strength of 265 MPa (38.4 ksi) and a tensile strength of 460 MPa (66.7 ksi) — weaker than 92% of steel grades. Elongation at break is 26% and the elastic modulus is 210 GPa (30.5 Msi). 15CrMo Annealed has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F). HR is the default condition FabDigit quotes; Annealed is available on request or by drawing note.
Advantages
- High service temperature — 550°C (1,022 °F), better than 95% of steel grades
- Ductile — tolerates forming and impact — 26%, better than 82% of steel grades
- Tough — resists crack growth — 120 MPa·√m (109.2 ksi·√in), better than 81% of steel grades
- Forms and bends easily — 65/100, better than 81% of steel grades
Limitations
- Low strength — 265 MPa (38.4 ksi), worse than 92% of steel grades
15CrMo Annealed properties
Typical room-temperature values for 15CrMo Annealed; 12 are specific to this condition. Other listed values are 15CrMo reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
15CrMo Annealed has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
15CrMo Annealed has a yield strength of 265 MPa (38.4 ksi) and a tensile strength of 460 MPa (66.7 ksi) — weaker than 92% of steel grades. Elongation at break is 26% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
15CrMo Annealed is rated for continuous service to 550°C (1,022 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 12.1 µm/m·K (6.72 µin/in·°F).
Electrical3
15CrMo Annealed conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (16/100), better than 79% of steel grades.
Sustainability4
Producing a kilogram of 15CrMo Annealed takes about 30 MJ of energy and emits 2.3 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 30%.
Manufacturability8
15CrMo Annealed's machinability is good (60/100, better than 83% of steel grades); weldability good (62/100); formability good (65/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 15CrMo Annealed
Is 15CrMo easy to machine?
Machines like normalized 4130 at ~60 % of 1212; carbide tooling, rigid setups and moderate speeds — anneal or N&T before heavy cuts and expect work hardening in the Q&T condition.
Can 15CrMo be welded?
Weldable with matched E8018-B2 / ER80S-B2 consumables, preheat 150–250 °C, interpass ≤300 °C and PWHT 680–720 °C to soften the martensitic HAZ and restore creep ductility.
Can 15CrMo be formed, bent or molded?
Hot forms readily at 1100–850 °C; cold bending of tube is possible with generous radii, but re-normalize and temper after severe cold work.
What surface finishes work on 15CrMo?
No anodizing; protect with phosphate + high-temperature aluminium paint, aluminizing or thermal insulation, since the alloy rusts freely below the dew point.
15CrMo 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 | 0.12 – 0.18 | 0.15 |
| Si | 0.17 – 0.37 | 0.27 |
| Mn | 0.4 – 0.7 | 0.55 |
| Cr | 0.8 – 1.1 | 0.95 |
| Mo | 0.4 – 0.55 | 0.48 |
| Niresidual | ≤ 0.3 | |
| Curesidual | ≤ 0.2 | |
| Pimpurity | ≤ 0.03 | |
| Simpurity | ≤ 0.03 | |
| Fe | balance |
15CrMo Annealed — frequently asked
What is 15CrMo Annealed used for?
15CrMo Annealed is typically used for boiler superheater tubes, hot petrochemical piping, steam headers and manifolds, pressure vessel plate for hydrogen service, forged flanges and pipe fittings and elevated-temperature pressure parts. In short: chrome-moly boiler pipe.
What is the yield strength of 15CrMo Annealed?
15CrMo Annealed has a typical yield strength of 265 MPa (38.4 ksi) and a tensile strength of 460 MPa (66.7 ksi) — weaker than 92% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is 15CrMo Annealed easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machines like normalized 4130 at ~60 % of 1212; carbide tooling, rigid setups and moderate speeds — anneal or N&T before heavy cuts and expect work hardening in the Q&T condition.
Can 15CrMo Annealed be welded?
Yes — weldability is rated good (62/100). Weldable with matched E8018-B2 / ER80S-B2 consumables, preheat 150–250 °C, interpass ≤300 °C and PWHT 680–720 °C to soften the martensitic HAZ and restore creep ductility.
What surface finishes work on 15CrMo Annealed?
No anodizing; protect with phosphate + high-temperature aluminium paint, aluminizing or thermal insulation, since the alloy rusts freely below the dew point.
Can 15CrMo Annealed be formed, bent or molded?
Hot forms readily at 1100–850 °C; cold bending of tube is possible with generous radii, but re-normalize and temper after severe cold work.
What is the maximum service temperature of 15CrMo Annealed?
15CrMo Annealed is rated for continuous use to about 550°C (1,022 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 15CrMo-HR and 15CrMo-CD?
HR is the default condition — most commonly stocked mill condition for 15CrMo plate, bar and seamless tube before final heat treatment or as-supplied for general pressure work. CD: pick for small-diameter bar needing tight tolerance, bright finish and higher yield strength without heat treatment. Yield strength is 305 MPa in HR versus 500 MPa in CD.
Can FabDigit make parts in 15CrMo Annealed?
Yes — 15CrMo Annealed 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
- GB/T 3077 Alloy structural steels (2015)
- GB 5310 Seamless steel tubes for high pressure boilers — SAC (2017)
- ASTM A335/A335M Grade P12 seamless ferritic alloy-steel pipe — ASTM International (2023)
- EN 10216-2 (13CrMo4-5, 1.7335) seamless steel tubes for pressure purposes — CEN (2020)
- ASM Handbook Vol.1: Properties and Selection — Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASME BPVC Section II Part D — physical properties and allowable stresses — ASME (2023)
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.