Steel 13CrMo4-5 +QT (Quenched and tempered)
Heat-treated state
EN 13CrMo4-5 · ASTM A335 P12
Choose for heavy-wall forgings, valve bodies and bar where higher room-temperature yield and uniform through-thickness toughness are needed.
Values for the +QT condition
Other 13CrMo4-5 tempers and conditions
13CrMo4-5 is listed in 4 conditions; see the grade overview at 13CrMo4-5.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Softest condition, supplied on bar/forging stock for heavy machining or cold forming before final normalizing/tempering. | 275 | 450 | 27 | 132 HB | — |
Normalized | Normalized-only condition sometimes supplied for thin-wall tube and plate where subsequent forming/PWHT will condition the steel. | 325 | 490 | 24 | 150 HB | — |
+NTDefault Normalized and tempered | Standard delivery condition for EN 10216-2 tubes, EN 10028-2 plate and EN 10273 bar — best balance of creep strength, toughness and weldability. | 340 | 500 | 24 | 155 HB | 42 W/m·K |
+QTThis page Quenched and tempered | Choose for heavy-wall forgings, valve bodies and bar where higher room-temperature yield and uniform through-thickness toughness are needed. | 420 | 560 | 20 | 12 HRC | — |
What is 13CrMo4-5 +QT?
13CrMo4-5 +QT is 13CrMo4-5 heat treated to +QT — choose for heavy-wall forgings, valve bodies and bar where higher room-temperature yield and uniform through-thickness toughness are needed. 13CrMo4-5 +QT has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 53% of steel grades. Elongation at break is 20% and the elastic modulus is 212 GPa (30.7 Msi). 13CrMo4-5 +QT 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; +QT is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 140 MPa·√m (127.4 ksi·√in), better than 94% of steel grades
- High service temperature — 540°C (1,004 °F), better than 93% of steel grades
13CrMo4-5 +QT properties
Typical room-temperature values for 13CrMo4-5 +QT; 19 are specific to this condition. Other listed values are 13CrMo4-5 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
13CrMo4-5 +QT 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
13CrMo4-5 +QT has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 53% of steel grades. Elongation at break is 20% and the elastic modulus is 212 GPa (30.7 Msi).
Thermal6
13CrMo4-5 +QT is rated for continuous service to 540°C (1,004 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 11.6 µm/m·K (6.44 µin/in·°F).
Electrical3
13CrMo4-5 +QT conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (14/100), better than 70% of steel grades.
Sustainability4
Producing a kilogram of 13CrMo4-5 +QT takes about 30 MJ of energy and emits 2.3 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 25%.
Manufacturability7
13CrMo4-5 +QT's machinability is fair (54/100, better than 54% of steel grades); weldability good (66/100); formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 13CrMo4-5 +QT
Is 13CrMo4-5 easy to machine?
Machines like a medium-carbon alloy steel (~60 % of 1212): rigid setups, carbide tooling, moderate speeds and generous coolant; annealed or +NT stock cuts best.
Can 13CrMo4-5 be welded?
Very weldable with matched 1Cr-0.5Mo consumables (E8018-B2 / ER80S-B2), preheat 150–250 °C, interpass control and PWHT 680–720 °C to soften the HAZ and restore creep ductility.
Can 13CrMo4-5 be formed, bent or molded?
Hot forming 850–1050 °C followed by re-normalizing and tempering; cold tube bending is routine but heavily cold-worked areas should be stress relieved.
What surface finishes work on 13CrMo4-5?
No inherent corrosion protection — pickle/blast then use heat-resistant paint, aluminizing or insulation; ferritic steel takes no anodizing.
13CrMo4-5 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 – 0.18 | 0.13 |
| Si | ≤ 0.35 | 0.25 |
| Mn | 0.4 – 1 | 0.6 |
| P | ≤ 0.03 | 0.01 |
| Stube grade; 0.015 max allowed in some plate/bar standards | ≤ 0.01 | 0.01 |
| Cr | 0.7 – 1.15 | 0.95 |
| Mo | 0.4 – 0.6 | 0.5 |
| Niresidual | ≤ 0.3 | 0.1 |
| Curesidual | ≤ 0.3 | 0.1 |
| Altotal Al | ≤ 0.04 | 0.02 |
| Fe | balance | — |
13CrMo4-5 +QT — frequently asked
What is 13CrMo4-5 +QT used for?
13CrMo4-5 +QT is typically used for boiler tubes, steam piping, pressure vessels and heat exchangers. In short: workhorse 1Cr-0.5Mo creep steel; weldable to 550 °C; standard boiler tube grade.
What is the yield strength of 13CrMo4-5 +QT?
13CrMo4-5 +QT has a typical yield strength of 420 MPa (60.9 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 53% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is 13CrMo4-5 +QT easy to machine?
Reasonably — machinability is rated fair (54/100, better than 54% of steel grades). Machines like a medium-carbon alloy steel (~60 % of 1212): rigid setups, carbide tooling, moderate speeds and generous coolant; annealed or +NT stock cuts best.
Can 13CrMo4-5 +QT be welded?
Yes — weldability is rated good (66/100). Very weldable with matched 1Cr-0.5Mo consumables (E8018-B2 / ER80S-B2), preheat 150–250 °C, interpass control and PWHT 680–720 °C to soften the HAZ and restore creep ductility.
What surface finishes work on 13CrMo4-5 +QT?
No inherent corrosion protection — pickle/blast then use heat-resistant paint, aluminizing or insulation; ferritic steel takes no anodizing.
Can 13CrMo4-5 +QT be formed, bent or molded?
Hot forming 850–1050 °C followed by re-normalizing and tempering; cold tube bending is routine but heavily cold-worked areas should be stress relieved.
What is the maximum service temperature of 13CrMo4-5 +QT?
13CrMo4-5 +QT 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 with specified elevated temperature properties — CEN (2020)
- EN 10028-2 — Flat products of steels for pressure purposes, alloy steels with elevated temperature properties — CEN (2017)
- EN 10273 — Hot rolled weldable steel bars for pressure purposes — CEN (2016)
- ASTM A335/A335M — Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service (Grade P12) — ASTM (2023)
- GB/T 5310 — Seamless steel tubes for high pressure boiler (15CrMo) — SAC (2017)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASME BPVC Section II Part D — Material Properties (allowable stresses, physical properties) — ASME (2023)
- Mysteel / SMM (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.