Why does 20CrMnTi contain titanium?

Titanium (0.04–0.10%) pins the grain boundaries during long, hot carburizing cycles, preventing the grain coarsening that plain Cr-Mn gear steels suffer — that is its advantage over the 20CrMnTi-free 5120 family.

20CrMnTi vs 20CrMnTiH?

The H variant adds a guaranteed hardenability (Jominy) band on top of the same chemistry — specified for critical automotive gears.

Grades · Alloy & Engineering Steel · 20CrMnTi

20CrMnTi

Data verified

20CrMnTi is China’s dominant carburizing gear steel (GB/T 3077): a Cr-Mn steel micro-alloyed with titanium for grain control, produced in huge tonnage for automotive and industrial gearboxes.

AISI4820 (near)

GB20CrMnTi (GB/T 3077)

CategoryAlloy & Engineering Steel

Chemical composition

Element	Content (%)
C	0.17–0.23
Si	0.17–0.37
Mn	0.80–1.10
P	≤0.035
S	≤0.035
Cr	1.00–1.30
Ti	0.04–0.10

Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.

Properties

Tensile strength	≥1080 MPa (GB/T 3077 reference, carburized + Q&T blank)
Yield strength	≥850 MPa (reference)
Case hardness (carburized)	58–64 HRC
Density	7.85 g/cm³

Heat treatment

Carburize 900–930 °C; quench 830–860 °C oil; temper 150–200 °C. Titanium keeps the austenite grain fine during long carburizing cycles.

Equivalent grades

Standard	Designation
aisi	4820 (near)
gb	20CrMnTi (GB/T 3077)

Compare side by side: 20CrMnTi vs 4820 · 20CrMnTi vs 5120

Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.

Applications & Processing

Applications: Automotive gears and shafts, gearbox pinions, high-duty carburized parts.

Processing: Excellent carburizing response and core strength; the default Chinese gear-steel offer, often ordered as 20CrMnTiH with a hardenability band.

FAQ

Why does 20CrMnTi contain titanium?: Titanium (0.04–0.10%) pins the grain boundaries during long, hot carburizing cycles, preventing the grain coarsening that plain Cr-Mn gear steels suffer — that is its advantage over the 20CrMnTi-free 5120 family.
20CrMnTi vs 20CrMnTiH?: The H variant adds a guaranteed hardenability (Jominy) band on top of the same chemistry — specified for critical automotive gears.

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Source: GB/T 3077 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.