Overview
20CrMnTiH is a Chinese GB/T 5216-2004 standard alloy steel specifically designed for carburizing applications, particularly in the automotive and machinery sectors. As a modified variant of 20CrMnTi with stricter composition control (denoted by 'H' suffix), it offers more consistent hardenability bands for precision engineering. The steel belongs to the Cr-Mn-Ti alloy system, where chromium enhances hardenability, manganese improves toughness, and titanium refines grain structure. Developed for mass production of high-stress components, this material is predominantly supplied as forged bars or hot-rolled stocks. Its controlled hardenability makes it a preferred choice for manufacturers requiring uniform mechanical properties across large production batches, especially in gear manufacturing where dimensional stability under heat treatment is critical.
Physical and Chemical Properties
The typical chemical composition includes 0.17-0.23% carbon, 0.17-0.37% silicon, 0.80-1.10% manganese, 1.00-1.30% chromium, and 0.04-0.10% titanium. This alloy system delivers a yield strength of ≥835 MPa and tensile strength of ≥1080 MPa after proper heat treatment. The titanium addition significantly reduces overheating sensitivity during carburizing processes. Microstructurally, 20CrMnTiH forms fine martensite with retained austenite after quenching, achieving surface hardness of HRC 58-62 while maintaining a tough core. Its hardenability band (J9=30-42 HRC) ensures consistent depth hardness profiles. The steel exhibits good machinability in annealed condition (187-229 HB) but requires proper tooling due to work hardening tendencies.
Main Applications
Approximately 60% of 20CrMnTiH production is consumed by automotive transmission systems, including synchronizer gears, planetary gear sets, and differential pinions. Its balanced properties make it suitable for components requiring both wear-resistant surfaces and impact-absorbing cores. The material is also specified for mining equipment gears, wind turbine shaft couplings, and heavy-duty bearing races. In industrial machinery, this grade is selected for camshafts, splined shafts, and other cyclic-load components where fatigue resistance is paramount. Emerging applications include robotic reducer gears and electric vehicle transmission parts, where its consistent hardenability reduces heat treatment distortion in precision components.
Safety and Storage
As with all alloy steels, machining 20CrMnTiH generates fine metallic dust requiring proper ventilation or wet cutting methods. OSHA-compliant PPE including safety goggles and NIOSH-approved respirators should be used during grinding or milling operations. The material presents no significant chemical hazards in solid form but may release chromium compounds during high-temperature welding. Raw material should be stored indoors with desiccants to prevent surface oxidation. For long-term storage (exceeding 6 months), vapor corrosion inhibitors or rust-preventive oils are recommended. Cut edges are particularly susceptible to corrosion and should be protected if not immediately processed.
B2B Procurement Guide
Industrial buyers should prioritize mills with IATF 16949 certification for automotive applications, requesting hardenability test reports (Jominy curves) and inclusion rating certificates. Standard diameters range from 20mm to 300mm hot-rolled bars, with forged blanks available for large gear blanks. Key procurement parameters include: hardenability band (H-band) compliance, non-metallic inclusion ratings (ASTM E45), and decarburization depth limits (<0.5% of diameter). Lead times typically range 4-8 weeks for custom heats. Consider requesting ESR (Electroslag Remelting) or VD (Vacuum Degassing) processed material for critical components. Price premiums of 15-20% apply for these refined versions. Just-in-time procurement is feasible through major steel service centers stocking pre-qualified grades.
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