Steel 13CrMoSi5-5
EN 13CrMoSi5-5
13CrMoSi5-5 (1.7336, 13CrMoSi44, A335 P11) is a silicon-alloyed 1.25Cr-0.5Mo creep-resisting tube steel in which the silicon addition improves high-temperature scaling resistance.
Reference datasheet — 13CrMoSi5-5 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
13CrMoSi5-5 tempers and conditions
13CrMoSi5-5 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, cold bending or before final heat treatment of forgings/fittings. | 250 | 450 | 30 | 135 HB | — |
+NTDefault Normalized and tempered | Standard EN 10216-2 / A335 P11 delivery condition for boiler, superheater and process-furnace tubing operating up to ~570 °C. | 290 | 500 | 26 | 150 HB | — |
Quenched and tempered | Choose for thicker-wall pipe, forged fittings and pressure parts needing higher room-temperature strength and toughness than +NT. | 400 | 590 | 22 | 12 HRC | — |
What is 13CrMoSi5-5?
13CrMoSi5-5 (1.7336, 13CrMoSi44, A335 P11) is a silicon-alloyed 1.25Cr-0.5Mo creep-resisting tube steel in which the silicon addition improves high-temperature scaling resistance. It is used for boiler and superheater tubing and pressure piping in +A, +NT and +QT conditions, with 290 MPa yield, 500 MPa tensile, 26 % elongation, 150 HB and a maximum service temperature of 570 °C. The chromium and silicon help only against dry high-temperature oxidation — corrosion resistance is 18, so wet-service parts need coating — and welding demands 150–250 °C preheat with PWHT. Where scaling is less critical, 13CrMo4-5 is the cheaper and more widely stocked equivalent. 13CrMoSi5-5 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). 13CrMoSi5-5 has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 88% of steel grades. Elongation at break is 26% and the elastic modulus is 210 GPa (30.5 Msi).
What is 13CrMoSi5-5 used for?
- boiler tubes
- superheater tubing
- pressure piping
Advantages
- High service temperature — 570°C (1,058 °F), better than 96% of steel grades
- Tough — resists crack growth — 130 MPa·√m (118.3 ksi·√in), better than 89% of steel grades
- Ductile — tolerates forming and impact — 26%, better than 82% of steel grades
Limitations
- Low strength — 290 MPa (42.1 ksi), worse than 88% of steel grades
13CrMoSi5-5 properties
Typical room-temperature values for 13CrMoSi5-5-+NT; bars are the position among steel grades.
Physical3
13CrMoSi5-5 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
13CrMoSi5-5 has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 88% of steel grades. Elongation at break is 26% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
13CrMoSi5-5 is rated for continuous service to 570°C (1,058 °F). It conducts heat at 39 W/m·K (22.5 BTU/hr·ft·°F), worse than 67% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
13CrMoSi5-5 conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (18/100), better than 83% of steel grades.
Sustainability4
Producing a kilogram of 13CrMoSi5-5 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
13CrMoSi5-5's machinability is good (55/100, better than 62% of steel grades); weldability good (65/100); formability good (60/100).
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. 13CrMoSi5-5 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 13CrMoSi5-5
Is 13CrMoSi5-5 easy to machine?
Machines like a normalized medium-carbon low-alloy steel — carbide tooling, ~55 % of AISI 1212 speeds; slightly gummy in the annealed condition, best surface finish at 150–190 HB.
Can 13CrMoSi5-5 be welded?
Weldable by GTAW/SMAW/SAW with matching 1.25Cr-0.5Mo filler (e.g. ER80S-B2 / E8018-B2); preheat 150–250 °C and PWHT at 700–750 °C to avoid hard HAZ and temper embrittlement.
Can 13CrMoSi5-5 be formed, bent or molded?
Hot form at 950–1150 °C; cold bending of tube is practical to ~3D radius in +A/+NT condition, followed by re-normalizing and tempering for creep service.
13CrMoSi5-5 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 |
|---|---|---|
| C | 0.08 – 0.15 | 0.13 |
| Siraised Si for scaling resistance | 0.5 – 1 | 0.7 |
| Mn | 0.4 – 0.7 | 0.55 |
| P | ≤ 0.03 | |
| S | ≤ 0.02 | |
| Cr | 1 – 1.5 | 1.25 |
| Mo | 0.45 – 0.65 | 0.55 |
| Fe | balance |
What surface finishes work on 13CrMoSi5-5?
No anodizing; protect with aluminizing/chromizing, high-temperature silicone-aluminium paint or phosphate + oil for storage — the Cr/Si only helps against dry high-temperature oxidation.
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 13CrMoSi5-5 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.733613CrMoSi44
- Similar grades
- A335 P11
How much does 13CrMoSi5-5 cost?
13CrMoSi5-5 is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
13CrMoSi5-5 — frequently asked
What is 13CrMoSi5-5 used for?
13CrMoSi5-5 is typically used for boiler tubes, superheater tubing and pressure piping. In short: better scaling resistance; 1.25Cr-0.5Mo tube steel; rated to 570 °C.
What is the yield strength of 13CrMoSi5-5?
13CrMoSi5-5 has a typical yield strength of 290 MPa (42.1 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 88% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is 13CrMoSi5-5 easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Machines like a normalized medium-carbon low-alloy steel — carbide tooling, ~55 % of AISI 1212 speeds; slightly gummy in the annealed condition, best surface finish at 150–190 HB.
Can 13CrMoSi5-5 be welded?
Yes — weldability is rated good (65/100). Weldable by GTAW/SMAW/SAW with matching 1.25Cr-0.5Mo filler (e.g. ER80S-B2 / E8018-B2); preheat 150–250 °C and PWHT at 700–750 °C to avoid hard HAZ and temper embrittlement.
What surface finishes work on 13CrMoSi5-5?
No anodizing; protect with aluminizing/chromizing, high-temperature silicone-aluminium paint or phosphate + oil for storage — the Cr/Si only helps against dry high-temperature oxidation.
Can 13CrMoSi5-5 be formed, bent or molded?
Hot form at 950–1150 °C; cold bending of tube is practical to ~3D radius in +A/+NT condition, followed by re-normalizing and tempering for creep service.
What is the maximum service temperature of 13CrMoSi5-5?
13CrMoSi5-5 is rated for continuous use to about 570°C (1,058 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 13CrMoSi5-5 cost?
13CrMoSi5-5 is a standard-cost steel ($$), 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 steels with specified elevated temperature properties — CEN (2020)
- ASTM A335/A335M — Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service (Grade P11) — ASTM International (2023)
- DIN 17175 — Seamless tubes of heat-resistant steels (13CrMoSi44 heritage grade) — DIN (1979)
- ASME BPVC Section II Part D — Properties (Metric), 1.25Cr-0.5Mo material data — ASME (2023)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
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.