Steel 30CrMnTi
GB 30CrMnTi
30CrMnTi is a chromium-manganese-titanium alloy gear steel, a higher-carbon variant of 20CrMnTi in which titanium restricts grain growth during carburising while the added carbon raises core strength.
Reference datasheet — 30CrMnTi 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 A condition
30CrMnTi tempers and conditions
30CrMnTi is supplied in 9 conditions, soft to hard. A is the default FabDigit quotes; the values on this page are for it.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ADefault Solution annealed | Standard mill-supplied soft condition for machining before carburising or hardening. | 480 | 780 | 18 | 207 HB | — |
Normalized | Choose to homogenise structure and improve machinability/dimensional stability of forgings before final heat treatment. | 570 | 900 | 15 | 22 HRC | 7.8 % IACS |
Cold drawn | Pick for close-tolerance, bright-surface bar used for shafts and pins machined with minimum stock removal. | 700 | 880 | 10 | 24 HRC | 7.8 % IACS |
QT 28–32 HRC | General quenched-and-tempered condition for shafts and machined gear blanks that must stay machinable after heat treatment. | 850 | 1,000 | 14 | 30 HRC | — |
Induction hardened | Use when only tooth flanks or journals need 52–58 HRC wear resistance over a tough quenched-and-tempered core. | 880 | 1,050 | 12 | 55 HRC | 7.5 % IACS |
QT 34–38 HRC | Higher-strength through-hardened condition for heavily loaded shafts and couplings still finish-machinable with carbide tooling. | 1,000 | 1,150 | 12 | 36 HRC | — |
Quenched + 400 °C temper | Medium temper for springy, high-strength shafts and torsion members needing more toughness than the 200 °C temper. | 1,180 | 1,330 | 11 | 42 HRC | — |
Carburized & hardened | Select for heavy-duty transmission gears needing a hard wear-resistant case over a stronger core than 20CrMnTi gives. | 1,200 | 1,500 | 9 | 60 HRC | — |
Double quench (880 °C + 850 °C oil) + 200 °C temper | The standard GB/T 3077 acceptance condition — maximum strength and wear resistance for gears and splines, low toughness reserve. | 1,270 | 1,560 | 10 | 46 HRC | — |
What is 30CrMnTi?
30CrMnTi is a chromium-manganese-titanium alloy gear steel, a higher-carbon variant of 20CrMnTi in which titanium restricts grain growth during carburising while the added carbon raises core strength. It is used mainly for heavy-duty transmission gears and is supplied as bar and forging stock in annealed, normalised, cold-drawn, quenched-and-tempered, carburised and induction-hardened conditions. Default-condition values are 480 MPa yield, 780 MPa tensile strength, 18% elongation and 207 HB, with service to 400 °C. Weldability is poor (32/100) and the steel has no inherent corrosion resistance; 20CrMnTi is the nearest alternative for lighter gear sets. 30CrMnTi has a density of 7.82 g/cm³ (0.283 lb/in³), lighter than 82% of steel grades. It melts at 1,425°C (2,597 °F). 30CrMnTi has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 59% of steel grades. Elongation at break is 18% and the elastic modulus is 210 GPa (30.5 Msi).
What is 30CrMnTi used for?
- heavy truck gears
- transmission shafts
- sprockets
30CrMnTi properties
Typical room-temperature values for 30CrMnTi-A; bars are the position among steel grades.
Physical3
30CrMnTi has a density of 7.82 g/cm³ (0.283 lb/in³), lighter than 82% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
30CrMnTi has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 59% of steel grades. Elongation at break is 18% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
30CrMnTi is rated for continuous service to 400°C (752 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 11.8 µm/m·K (6.56 µin/in·°F).
Electrical3
30CrMnTi conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 30CrMnTi takes about 29 MJ of energy and emits 2.1 kg of CO₂ — less than 53% of steel grades. Typical recycled content is 30%.
Manufacturability7
30CrMnTi's machinability is good (58/100, better than 75% of steel grades); weldability poor (32/100); formability fair (45/100).
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. 30CrMnTi is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 30CrMnTi
Is 30CrMnTi easy to machine?
Machine in the annealed (≤229 HB) or 28–32 HRC condition with sharp carbide tooling and rigid setups; leave 0.2–0.4 mm grinding stock for post-hardening finishing of gear teeth and journals.
Can 30CrMnTi be welded?
Poor weldability (CE ≈ 0.7–0.8) — preheat 250–350 °C, use low-hydrogen consumables and temper immediately after welding; avoid welding carburised or hardened parts.
Can 30CrMnTi be formed, bent or molded?
Hot forge 1150–1200 °C finishing above 850 °C followed by slow cool and annealing; cold forming limited to mild bending in the annealed state.
30CrMnTi 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 | 0.24 – 0.32 | 0.3 |
| Si | 0.17 – 0.37 | 0.27 |
| Mn | 0.8 – 1.1 | 0.95 |
| Cr | 1 – 1.3 | 1.15 |
| Tigrain refiner / carbide former | 0.04 – 0.1 | 0.07 |
| Niresidual | ≤ 0.3 | |
| Curesidual | ≤ 0.25 | |
| Pimpurity | ≤ 0.03 | |
| Simpurity | ≤ 0.03 | |
| Fe | balance |
What surface finishes work on 30CrMnTi?
Cannot be anodised — protect with Mn-phosphate (also good for gear run-in), black oxide, zinc plating or oil; shot peening after hardening significantly raises bending fatigue life.
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
How much does 30CrMnTi cost?
30CrMnTi 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.
30CrMnTi — frequently asked
What is 30CrMnTi used for?
30CrMnTi is typically used for heavy truck gears, transmission shafts and sprockets. In short: higher-core-strength 20CrMnTi; carburising gear steel; poor weldability, high strength.
What is the yield strength of 30CrMnTi?
30CrMnTi has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 59% of steel grades. Strength varies by condition: see the 9 listed tempers.
Is 30CrMnTi easy to machine?
Reasonably — machinability is rated good (58/100, better than 75% of steel grades). Machine in the annealed (≤229 HB) or 28–32 HRC condition with sharp carbide tooling and rigid setups; leave 0.2–0.4 mm grinding stock for post-hardening finishing of gear teeth and journals.
Can 30CrMnTi be welded?
Not readily — weldability is rated poor (32/100). Poor weldability (CE ≈ 0.7–0.8) — preheat 250–350 °C, use low-hydrogen consumables and temper immediately after welding; avoid welding carburised or hardened parts.
What surface finishes work on 30CrMnTi?
Cannot be anodised — protect with Mn-phosphate (also good for gear run-in), black oxide, zinc plating or oil; shot peening after hardening significantly raises bending fatigue life.
Can 30CrMnTi be formed, bent or molded?
Hot forge 1150–1200 °C finishing above 850 °C followed by slow cool and annealing; cold forming limited to mild bending in the annealed state.
What is the maximum service temperature of 30CrMnTi?
30CrMnTi is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 30CrMnTi-A and 30CrMnTi-QT200?
A is the default condition — standard mill-supplied soft condition for machining before carburising or hardening. QT200: the standard GB/T 3077 acceptance condition — maximum strength and wear resistance for gears and splines, low toughness reserve. Yield strength is 480 MPa in A versus 1,270 MPa in QT200.
How much does 30CrMnTi cost?
30CrMnTi 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
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.4A — Steel Heat Treating Fundamentals and Processes — ASM International (2013)
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.