Steel 20CrMoVTiB4-10
EN 20CrMoVTiB4-10
20CrMoVTiB4-10 (1.7729) is a low-carbon Cr-Mo-V alloy steel micro-alloyed with vanadium, titanium and boron to raise hardenability and wear resistance after carburizing, and also used quenched and tempered for hot bolting.
Reference datasheet — 20CrMoVTiB4-10 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
20CrMoVTiB4-10 tempers and conditions
20CrMoVTiB4-10 is supplied in 5 conditions, soft to hard. +QT is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Delivery condition for bar that will be machined or hot-formed before final quench-and-temper. | 400 | 650 | 21 | 200 HB | — |
Normalized | Intermediate condition after forging, used to refine grain before final hardening. | 520 | 780 | 18 | 21 HRC | 8 % IACS |
Hot rolled / forged, peeled or rough-turned bar | Mill supply for re-forging or for customers who perform their own quench and temper. | 520 | 800 | 17 | 22 HRC | 8 % IACS |
+QT heavy section | Large studs and forged bars where mass effect lowers the guaranteed strength band despite the B+Ti hardenability boost. | 720 | 860 | 16 | 26 HRC | 7.8 % IACS |
+QTDefault Quenched and tempered | Standard supply condition for high-temperature bolts and studs: oil quench from ~960–990 °C, temper 680–730 °C. | 780 | 900 | 16 | 29 HRC | — |
What is 20CrMoVTiB4-10?
20CrMoVTiB4-10 (1.7729) is a low-carbon Cr-Mo-V alloy steel micro-alloyed with vanadium, titanium and boron to raise hardenability and wear resistance after carburizing, and also used quenched and tempered for hot bolting. Typical +QT values are 780 MPa yield, 900 MPa tensile, 16% elongation and about 280 HB (29 HRC), with service to 540 °C; forms are bar, forged bolt blanks and gear blanks. Heat treatment and welding are boron-sensitive, welding requires 250-350 °C preheat plus PWHT, and there is no corrosion resistance. 21CrMoV5-7 is the more widely stocked alternative for steam bolting. 20CrMoVTiB4-10 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F). 20CrMoVTiB4-10 has a yield strength of 780 MPa (113 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 86% of steel grades. Elongation at break is 16% and the elastic modulus is 210 GPa (30.5 Msi).
What is 20CrMoVTiB4-10 used for?
- Carburized gears
- High-wear shafts
- Automotive transmission components
- Heavy machinery parts
Advantages
- High service temperature — 540°C (1,004 °F), better than 93% of steel grades
- High strength — 780 MPa (113 ksi), better than 86% of steel grades
20CrMoVTiB4-10 properties
Typical room-temperature values for 20CrMoVTiB4-10-+QT; bars are the position among steel grades.
Physical3
20CrMoVTiB4-10 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
20CrMoVTiB4-10 has a yield strength of 780 MPa (113 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 86% of steel grades. Elongation at break is 16% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
20CrMoVTiB4-10 is rated for continuous service to 540°C (1,004 °F). It conducts heat at 38 W/m·K (22 BTU/hr·ft·°F), worse than 69% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
20CrMoVTiB4-10 conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (15/100), better than 75% of steel grades.
Sustainability4
Producing a kilogram of 20CrMoVTiB4-10 takes about 33 MJ of energy and emits 2.4 kg of CO₂ — more than 76% of steel grades. Typical recycled content is 30%.
Manufacturability8
20CrMoVTiB4-10's machinability is fair (45/100, worse than 65% of steel grades); weldability fair (35/100); formability poor (25/100).
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. 20CrMoVTiB4-10 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 20CrMoVTiB4-10
Is 20CrMoVTiB4-10 easy to machine?
Machine in the annealed or normalized state where possible; in +QT at ~280 HB use rigid setups, coated carbide, 80–140 m/min and generous coolant — V/Ti carbides accelerate flank wear.
Can 20CrMoVTiB4-10 be welded?
Weldable only with matched Cr-Mo-V or 1CrMo consumables, 250–350 °C preheat and PWHT at 690–730 °C; avoid welding on finished bolt bodies.
Can 20CrMoVTiB4-10 be formed, bent or molded?
Hot forge 1100–850 °C then normalize; cold heading is not practical — bolt heads are hot- or warm-formed before quench and temper.
20CrMoVTiB4-10 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 | 0.1 – 0.35 | 0.25 |
| Mn | 0.4 – 0.8 | 0.6 |
| P | ≤ 0.03 | |
| S | ≤ 0.02 | |
| Cr | 0.9 – 1.2 | 1.05 |
| Mo | 0.9 – 1.1 | 1 |
| Vrange varies slightly between DIN 17240 and EN 10269 editions | 0.2 – 0.35 | 0.28 |
| Tigrain refinement, protects boron from N | 0.04 – 0.12 | 0.08 |
| Bhardenability booster | 0 – 0.01 | 0 |
| Fe | balance |
What surface finishes work on 20CrMoVTiB4-10?
No anodising; use phosphate + MoS₂ or graphite anti-seize for hot bolting, aluminium/zinc-flake or aluminising for oxidation protection; avoid electroplating (hydrogen embrittlement) or bake immediately.
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 20CrMoVTiB4-10 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.7729
How much does 20CrMoVTiB4-10 cost?
20CrMoVTiB4-10 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.
20CrMoVTiB4-10 — frequently asked
What is 20CrMoVTiB4-10 used for?
20CrMoVTiB4-10 is typically used for carburized gears, high-wear shafts, automotive transmission components and heavy machinery parts. In short: boron-boosted hardenability; carburizing and hot-bolting grade; wear resistant after case hardening.
What is the yield strength of 20CrMoVTiB4-10?
20CrMoVTiB4-10 has a typical yield strength of 780 MPa (113 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 86% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is 20CrMoVTiB4-10 easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Machine in the annealed or normalized state where possible; in +QT at ~280 HB use rigid setups, coated carbide, 80–140 m/min and generous coolant — V/Ti carbides accelerate flank wear.
Can 20CrMoVTiB4-10 be welded?
With care — weldability is rated fair (35/100). Weldable only with matched Cr-Mo-V or 1CrMo consumables, 250–350 °C preheat and PWHT at 690–730 °C; avoid welding on finished bolt bodies.
What surface finishes work on 20CrMoVTiB4-10?
No anodising; use phosphate + MoS₂ or graphite anti-seize for hot bolting, aluminium/zinc-flake or aluminising for oxidation protection; avoid electroplating (hydrogen embrittlement) or bake immediately.
Can 20CrMoVTiB4-10 be formed, bent or molded?
Hot forge 1100–850 °C then normalize; cold heading is not practical — bolt heads are hot- or warm-formed before quench and temper.
What is the maximum service temperature of 20CrMoVTiB4-10?
20CrMoVTiB4-10 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.
How much does 20CrMoVTiB4-10 cost?
20CrMoVTiB4-10 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)
- DIN 17240 — Warmfeste und hochwarmfeste Werkstoffe für Schrauben und Muttern — DIN (1976)
- EN 10027-2 / Stahl-Eisen-Liste material number 1.7729 — Verlag Stahleisen (2015)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials — ASM International (2005)
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.