Steel 10CrMo5-5 +A (Annealed)
Heat-treated state
EN 10CrMo5-5 · ASTM A335 P11
Choose for maximum machinability, cold bending or before re-heat-treatment; lowest strength condition.
Values for the +A condition
Other 10CrMo5-5 tempers and conditions
10CrMo5-5 is listed in 6 conditions; see the grade overview at 10CrMo5-5.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
+AThis page Annealed | Choose for maximum machinability, cold bending or before re-heat-treatment; lowest strength condition. | 255 | 430 | 32 | 135 HB | 7.9 % IACS |
+NTDefault Normalized and tempered | Standard delivery condition for boiler/superheater tube and pressure pipe; balanced creep strength, toughness and weldability. | 330 | 500 | 26 | 160 HB | — |
Hot rolled | Economical semi-finished bar/plate to be normalized or Q&T by the fabricator; not for pressure service as delivered. | 330 | 520 | 22 | 170 HB | 7.8 % IACS |
Normalized | Normalized only; slightly higher strength and hardness than +NT but less stable microstructure — used for plate and heavier sections where tempering is done later. | 350 | 520 | 24 | 170 HB | 7.8 % IACS |
Quenched and tempered | Used for thick-wall pipe, forgings and headers needing higher room-temperature strength with good toughness. | 410 | 560 | 22 | 12 HRC | — |
Cold drawn and stress relieved | Small-bore precision instrument/heater tube where tight tolerance and higher yield matter more than creep-optimised microstructure. | 460 | 580 | 14 | 11 HRC | 7.6 % IACS |
What is 10CrMo5-5 +A?
10CrMo5-5 +A is 10CrMo5-5 heat treated to +A — choose for maximum machinability, cold bending or before re-heat-treatment; lowest strength condition. 10CrMo5-5 +A has a yield strength of 255 MPa (37 ksi) and a tensile strength of 430 MPa (62.4 ksi) — weaker than 93% of steel grades. Elongation at break is 32% and the elastic modulus is 210 GPa (30.5 Msi). 10CrMo5-5 +A 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). +NT is the default condition FabDigit quotes; +A is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 150 MPa·√m (136.5 ksi·√in), better than 96% of steel grades
- Ductile — tolerates forming and impact — 32%, better than 95% of steel grades
- High service temperature — 540°C (1,004 °F), better than 93% of steel grades
- Easy to machine — 62/100, better than 89% of steel grades
- Forms and bends easily — 70/100, better than 86% of steel grades
Limitations
- Low strength — 255 MPa (37 ksi), worse than 93% of steel grades
10CrMo5-5 +A properties
Typical room-temperature values for 10CrMo5-5 +A; 22 are specific to this condition. Other listed values are 10CrMo5-5 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
10CrMo5-5 +A 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
10CrMo5-5 +A has a yield strength of 255 MPa (37 ksi) and a tensile strength of 430 MPa (62.4 ksi) — weaker than 93% of steel grades. Elongation at break is 32% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
10CrMo5-5 +A is rated for continuous service to 540°C (1,004 °F). It conducts heat at 41 W/m·K (23.7 BTU/hr·ft·°F), worse than 62% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
10CrMo5-5 +A conducts electricity at 7.9 % IACS, better than 50% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (16/100), better than 79% of steel grades.
Sustainability4
Producing a kilogram of 10CrMo5-5 +A takes about 30 MJ of energy and emits 2.4 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 30%.
Manufacturability7
10CrMo5-5 +A's machinability is good (62/100, better than 89% of steel grades); weldability good (65/100); formability very good (70/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 10CrMo5-5 +A
Is 10CrMo5-5 easy to machine?
Machines like a normalized 4130-class steel — carbide tooling, moderate speeds, ~60 % of AISI 1212; anneal first for heavy chip removal or threading.
Can 10CrMo5-5 be welded?
Good weldability with matching 1.25Cr-0.5Mo filler (E8018-B2 / ER80S-B2); preheat 150–250 °C and PWHT 700–760 °C to soften the HAZ and avoid hydrogen cracking.
Can 10CrMo5-5 be formed, bent or molded?
Cold-bend tube to moderate radii in +NT or +A condition; hot form at 900–1050 °C followed by re-normalizing and tempering for pressure service.
What surface finishes work on 10CrMo5-5?
No anodizing; use pickling/phosphating, high-temperature aluminium or silicone paint, or aluminising for fireside oxidation protection.
10CrMo5-5 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 |
|---|---|---|
| CEN 10216-2 / EN 10028-2 | 0.08 – 0.14 | 0.11 |
| SiASTM A335 P11 allows 0.50–1.00 Si | 0.15 – 0.5 | 0.3 |
| Mn | 0.4 – 0.8 | 0.55 |
| P | ≤ 0.03 | — |
| S | ≤ 0.01 | — |
| Cr | 1 – 1.5 | 1.25 |
| Mo | 0.45 – 0.65 | 0.55 |
| Niresidual max | ≤ 0.3 | — |
| Altotal Al, max | ≤ 0.04 | — |
| Fe | balance | — |
10CrMo5-5 +A — frequently asked
What is 10CrMo5-5 +A used for?
10CrMo5-5 +A is typically used for boiler tubes, superheater tubes and pressure piping. In short: low-carbon Cr-Mo tube steel; easy field welding; good cold bendability.
What is the yield strength of 10CrMo5-5 +A?
10CrMo5-5 +A has a typical yield strength of 255 MPa (37 ksi) and a tensile strength of 430 MPa (62.4 ksi) — weaker than 93% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is 10CrMo5-5 +A easy to machine?
Reasonably — machinability is rated good (62/100, better than 89% of steel grades). Machines like a normalized 4130-class steel — carbide tooling, moderate speeds, ~60 % of AISI 1212; anneal first for heavy chip removal or threading.
Can 10CrMo5-5 +A be welded?
Yes — weldability is rated good (65/100). Good weldability with matching 1.25Cr-0.5Mo filler (E8018-B2 / ER80S-B2); preheat 150–250 °C and PWHT 700–760 °C to soften the HAZ and avoid hydrogen cracking.
What surface finishes work on 10CrMo5-5 +A?
No anodizing; use pickling/phosphating, high-temperature aluminium or silicone paint, or aluminising for fireside oxidation protection.
Can 10CrMo5-5 +A be formed, bent or molded?
Cold-bend tube to moderate radii in +NT or +A condition; hot form at 900–1050 °C followed by re-normalizing and tempering for pressure service.
What is the maximum service temperature of 10CrMo5-5 +A?
10CrMo5-5 +A is rated for continuous use to about 540°C (1,004 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- EN 10216-2 Seamless steel tubes for pressure purposes — 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 (Grade P11) and ASTM A213/A213M (Grade T11) — ASTM (2022)
- GB 5310 (12Cr1MoVG / 15CrMoG comparable grades) — SAC (2017)
- ASM Handbook Vol.1: Properties and Selection — Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASME BPVC Section II Part D — physical and allowable stress data for 1.25Cr-0.5Mo — ASME (2023)
- Mysteel / SMM — Mysteel (2025)
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.