Steel 20CrMoV13-5-5
EN 20CrMoV13-5-5
20CrMoV13-5-5 (1.7779) is a creep-resistant chromium-molybdenum-vanadium alloy steel from the EN quenched-and-tempered bar and forging family.
Reference datasheet — 20CrMoV13-5-5 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 +QT condition
20CrMoV13-5-5 tempers and conditions
20CrMoV13-5-5 is supplied in 6 conditions, soft to hard. +QT is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Supply condition for rough machining, deep drilling and forging stock before final Q&T. | 450 | 720 | 20 | 220 HB | — |
+QT | Same treatment on large forged studs and turbine bolting where mass effect lowers the guaranteed strength class. | 700 | 870 | 17 | 25 HRC | 6.2 % IACS |
Hot rolled | Mill stock for customers who forge and heat treat in-house; properties are not guaranteed in this condition. | 700 | 1,000 | 12 | 32 HRC | 6.2 % IACS |
+QTDefault Quenched and tempered | Standard delivery condition for high-temperature bolts, studs and nuts to EN 10269; best combination of proof strength and creep-relaxation resistance. | 760 | 920 | 16 | 28 HRC | — |
+QT + gas nitrided | Chosen for threads and mating faces that must resist galling and fretting at temperature; Cr+V make the steel very nitridable. | 760 | 920 | 15 | 28 HRC | 6.2 % IACS |
Normalized | Intermediate grain-refining treatment on forgings; almost always followed by tempering because the steel air-hardens. | 780 | 1,050 | 12 | 34 HRC | 6.2 % IACS |
What is 20CrMoV13-5-5?
20CrMoV13-5-5 (1.7779) is a creep-resistant chromium-molybdenum-vanadium alloy steel from the EN quenched-and-tempered bar and forging family. In +QT it typically gives 760 MPa yield, 920 MPa tensile, 16 % elongation and about 275 HB (28 HRC) with service to 550 °C, so it is specified for turbine and boiler bolting supplied as bar, forged studs and nuts. It is air-hardening: welding needs preheat and post-weld heat treatment and is normally avoided on finished bolting. Machinability is low (score 40), there is no corrosion resistance, and stock is limited to bar and forgings; a plain Cr-Mo quenched-and-tempered steel is cheaper where 550 °C capability is not required. 20CrMoV13-5-5 has a density of 7.8 g/cm³ (0.282 lb/in³), lighter than 87% of steel grades. It melts at 1,450°C (2,642 °F). 20CrMoV13-5-5 has a yield strength of 760 MPa (110 ksi) and a tensile strength of 920 MPa (133 ksi) — stronger than 85% of steel grades. Elongation at break is 16% and the elastic modulus is 213 GPa (30.9 Msi).
What is 20CrMoV13-5-5 used for?
- steam turbine bolts
- high-temperature fasteners
- power plant flange studs
Advantages
- High service temperature — 550°C (1,022 °F), better than 95% of steel grades
- High strength — 760 MPa (110 ksi), better than 85% of steel grades
Limitations
- Poor heat conductor — 33 W/m·K (19.1 BTU/hr·ft·°F), worse than 80% of steel grades
- Limited formability — 20/100, worse than 80% of steel grades
- Low electrical conductivity — 6.2 % IACS, worse than 78% of steel grades
- Difficult to machine — 40/100, worse than 77% of steel grades
20CrMoV13-5-5 properties
Typical room-temperature values for 20CrMoV13-5-5-+QT; bars are the position among steel grades.
Physical3
20CrMoV13-5-5 has a density of 7.8 g/cm³ (0.282 lb/in³), lighter than 87% of steel grades. It melts at 1,450°C (2,642 °F).
Mechanical16
20CrMoV13-5-5 has a yield strength of 760 MPa (110 ksi) and a tensile strength of 920 MPa (133 ksi) — stronger than 85% of steel grades. Elongation at break is 16% and the elastic modulus is 213 GPa (30.9 Msi).
Thermal6
20CrMoV13-5-5 is rated for continuous service to 550°C (1,022 °F). It conducts heat at 33 W/m·K (19.1 BTU/hr·ft·°F), worse than 80% of steel grades. Thermal expansion is 11.8 µm/m·K (6.56 µin/in·°F).
Electrical3
20CrMoV13-5-5 conducts electricity at 6.2 % IACS, worse than 78% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (18/100), better than 83% of steel grades.
Sustainability4
Producing a kilogram of 20CrMoV13-5-5 takes about 34 MJ of energy and emits 2.4 kg of CO₂ — more than 82% of steel grades. Typical recycled content is 25%.
Manufacturability7
20CrMoV13-5-5's machinability is fair (40/100, worse than 77% of steel grades); weldability poor (30/100); formability poor (20/100).
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. 20CrMoV13-5-5 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 20CrMoV13-5-5
Is 20CrMoV13-5-5 easy to machine?
Machine in the annealed condition where possible; in +QT (≈28 HRC) use rigid setups, coated carbide, low-to-moderate speeds and generous coolant — thread rolling before final temper is preferred to cutting.
Can 20CrMoV13-5-5 be welded?
Air-hardening grade: preheat 250–350 °C, low-hydrogen matching Cr-Mo-V consumables, keep interpass temperature and apply PWHT at 700–730 °C; welding of finished bolting is normally avoided.
Can 20CrMoV13-5-5 be formed, bent or molded?
Hot forge 1100–850 °C with slow controlled cooling to avoid cracking; cold forming is impractical, so heads and threads are hot-formed or machined.
20CrMoV13-5-5 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 | 0.17 – 0.23 | 0.2 |
| Si | ≤ 0.35 | 0.25 |
| Mn | 0.4 – 0.8 | 0.6 |
| P | ≤ 0.03 | 0.01 |
| S | ≤ 0.02 | 0.01 |
| Cr | 3 – 3.5 | 3.25 |
| Mo | 0.5 – 0.7 | 0.6 |
| V | 0.45 – 0.65 | 0.55 |
| Niresidual limit | ≤ 0.5 | 0.2 |
| Fe | balance |
What surface finishes work on 20CrMoV13-5-5?
Not corrosion resistant — supplied black, phosphated, oiled or aluminium/ceramic-coated; nitriding is the usual surface treatment for anti-galling threads, and electroplating must be avoided or baked to prevent hydrogen embrittlement.
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 20CrMoV13-5-5 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.7779
How much does 20CrMoV13-5-5 cost?
20CrMoV13-5-5 is a premium-cost steel ($$$), cheaper than about 51% 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.
20CrMoV13-5-5 — frequently asked
What is 20CrMoV13-5-5 used for?
20CrMoV13-5-5 is typically used for steam turbine bolts, high-temperature fasteners and power plant flange studs. In short: creep-resistant bolting steel; service to 550 °C; nitridable thread surfaces.
What is the yield strength of 20CrMoV13-5-5?
20CrMoV13-5-5 has a typical yield strength of 760 MPa (110 ksi) and a tensile strength of 920 MPa (133 ksi) — stronger than 85% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is 20CrMoV13-5-5 easy to machine?
Not especially — machinability is rated fair (40/100, worse than 77% of steel grades). Machine in the annealed condition where possible; in +QT (≈28 HRC) use rigid setups, coated carbide, low-to-moderate speeds and generous coolant — thread rolling before final temper is preferred to cutting.
Can 20CrMoV13-5-5 be welded?
Not readily — weldability is rated poor (30/100). Air-hardening grade: preheat 250–350 °C, low-hydrogen matching Cr-Mo-V consumables, keep interpass temperature and apply PWHT at 700–730 °C; welding of finished bolting is normally avoided.
What surface finishes work on 20CrMoV13-5-5?
Not corrosion resistant — supplied black, phosphated, oiled or aluminium/ceramic-coated; nitriding is the usual surface treatment for anti-galling threads, and electroplating must be avoided or baked to prevent hydrogen embrittlement.
Can 20CrMoV13-5-5 be formed, bent or molded?
Hot forge 1100–850 °C with slow controlled cooling to avoid cracking; cold forming is impractical, so heads and threads are hot-formed or machined.
What is the maximum service temperature of 20CrMoV13-5-5?
20CrMoV13-5-5 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 20CrMoV13-5-5 cost?
20CrMoV13-5-5 is a premium-cost steel ($$$), cheaper than about 51% 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 10269 — Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties — CEN (2013)
- EN 10222-2 — Steel forgings for pressure purposes: ferritic and martensitic steels with specified elevated temperature properties — CEN (2021)
- DIN 17240 — Heat-resistant and high-temperature bolting materials (superseded, historical basis) — DIN (1976)
- Stahlschlüssel / Key to Steel — material no. 1.7779 — Verlag Stahlschlüssel Wegst (2019)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys (Cr-Mo-V creep steels) — 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.