Steel 13CrMo4-5
EN 13CrMo4-5 · ASTM A335 P12
13CrMo4-5 (1.7335, 13CrMo44, A335 P12) is a low-alloy 1Cr-0.5Mo creep-resisting steel for elevated-temperature pressure piping and boiler components, supplied to EN 10216-2/10273 in +N, +NT, +QT and +A conditions.
Reference datasheet — 13CrMo4-5 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
13CrMo4-5 tempers and conditions
13CrMo4-5 is supplied in 4 conditions, soft to hard. +NT is the default FabDigit quotes; the values on this page are for it.
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 |
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?
13CrMo4-5 (1.7335, 13CrMo44, A335 P12) is a low-alloy 1Cr-0.5Mo creep-resisting steel for elevated-temperature pressure piping and boiler components, supplied to EN 10216-2/10273 in +N, +NT, +QT and +A conditions. Engineers specify it for stable strength and creep behaviour up to 550 °C — 340 MPa yield, 500 MPa tensile, 24 % elongation, 155 HB and 42 W/m·K — in seamless tube, pipe, plate and forged fittings. Corrosion resistance is minimal (score 14), so surfaces need coating or insulation, and welding requires preheat plus post-weld heat treatment. For hotter or more highly stressed service move up to 10CrMo9-10 or a 9Cr grade. 13CrMo4-5 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). 13CrMo4-5 has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 76% of steel grades. Elongation at break is 24% and the elastic modulus is 212 GPa (30.7 Msi).
What is 13CrMo4-5 used for?
- boiler tubes
- steam piping
- pressure vessels
- heat exchangers
Advantages
- High service temperature — 550°C (1,022 °F), better than 95% of steel grades
- Tough — resists crack growth — 120 MPa·√m (109.2 ksi·√in), better than 81% of steel grades
- Forms and bends easily — 62/100, better than 78% of steel grades
Limitations
- Low strength — 340 MPa (49.3 ksi), worse than 76% of steel grades
13CrMo4-5 properties
Typical room-temperature values for 13CrMo4-5-+NT; bars are the position among steel grades.
Physical3
13CrMo4-5 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 has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 76% of steel grades. Elongation at break is 24% and the elastic modulus is 212 GPa (30.7 Msi).
Thermal6
13CrMo4-5 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 11.6 µm/m·K (6.44 µin/in·°F).
Electrical3
13CrMo4-5 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 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's machinability is good (60/100, better than 83% of steel grades); weldability very good (70/100); formability good (62/100).
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. 13CrMo4-5 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 13CrMo4-5
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.
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 |
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.
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 13CrMo4-5 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- A335 P12
- EN / DIN / Werkstoff-Nr.
- 1.733513CrMo44
How much does 13CrMo4-5 cost?
13CrMo4-5 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
13CrMo4-5 — frequently asked
What is 13CrMo4-5 used for?
13CrMo4-5 is typically used for boiler tubes, steam piping, pressure vessels and heat exchangers. In short: workhorse 1Cr-0.5Mo creep steel; weldable to 550 °C; standard boiler tube grade.
What is the yield strength of 13CrMo4-5?
13CrMo4-5 has a typical yield strength of 340 MPa (49.3 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 76% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is 13CrMo4-5 easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machines like a medium-carbon alloy steel (~60 % of 1212): rigid setups, carbide tooling, moderate speeds and generous coolant; annealed or +NT stock cuts best.
Can 13CrMo4-5 be welded?
Yes — weldability is rated very good (70/100). Very weldable with matched 1Cr-0.5Mo consumables (E8018-B2 / ER80S-B2), preheat 150–250 °C, interpass control and PWHT 680–720 °C to soften the HAZ and restore creep ductility.
What surface finishes work on 13CrMo4-5?
No inherent corrosion protection — pickle/blast then use heat-resistant paint, aluminizing or insulation; ferritic steel takes no anodizing.
Can 13CrMo4-5 be formed, bent or molded?
Hot forming 850–1050 °C followed by re-normalizing and tempering; cold tube bending is routine but heavily cold-worked areas should be stress relieved.
What is the maximum service temperature of 13CrMo4-5?
13CrMo4-5 is rated for continuous use to about 550°C (1,022 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 13CrMo4-5 cost?
13CrMo4-5 is a budget-cost steel ($), cheaper than about 90% 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, 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; 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.