Gear Steel Round Bar
Introduction:
30CrMnTi is a classic carburizing alloy gear steel in accordance with GB/T 3077-2015 standard, widely applied in heavy-load transmission components. It adopts optimized Cr-Mn-Ti alloy design with strictly controlled chemical composition and low harmful impurity content.
Product Overview
30CrMnTi is a classic carburizing alloy gear steel in accordance with GB/T 3077-2015 standard, widely applied in heavy-load transmission components. It adopts optimized Cr-Mn-Ti alloy design with strictly controlled chemical composition and low harmful impurity content. The steel features fine and stable grain structure, excellent hardenability, outstanding wear resistance, fatigue resistance and impact toughness. It will not produce grain coarsening under conventional high-temperature carburizing process, with small heat treatment deformation and high dimensional stability. After carburizing and quenching, the workpiece achieves high surface hardness and strong core toughness, perfectly matching the service characteristics of long-term alternating load, heavy impact and friction of gear parts. It is the preferred steel for manufacturing high-precision and heavy-duty gears and shaft parts.
Representative Grades
Representative Grade: 30CrMnTi
Core Characteristics & Application: 30CrMnTi is a medium-carbon low-alloy carburizing structural steel. It combines high surface wear resistance and core impact toughness, with stable thermal processing performance and low quenching deformation. The trace titanium element refines grains and eliminates high-temperature grain growth defects. It is mainly used for heavy-load gears, gear shafts, transmission shafts and reduction gear components of automobiles, engineering machinery and agricultural machinery, suitable for harsh working conditions of frequent impact and alternating fatigue load.
Grade Description
The grade 30CrMnTi is named according to Chinese alloy steel naming rules. The number "30" indicates the average carbon content of 0.30%, which provides sufficient surface hardness after carburizing treatment. Cr (Chromium) and Mn (Manganese) elements greatly improve the hardenability, strength and toughness of the steel, ensuring excellent comprehensive mechanical properties of thick-specification parts. Ti (Titanium) is the core characteristic element, which can refine grains, inhibit high-temperature grain coarsening, reduce quenching cracks and improve fatigue resistance. Standard chemical composition: C: 0.24–0.32%, Si: 0.17–0.37%, Mn: 0.80–1.10%, Cr: 1.00–1.30%, Ti: 0.04–0.10%, S≤0.035%, P≤0.035%. Standard mechanical properties: Tensile Strength ≥1470MPa, Elongation ≥9%, Section Shrinkage ≥40%, Impact Energy ≥47J, Delivery Hardness ≤229HB.
Product Specifications
Basic parameters and available sizes of 30CrMnTi gear steel round bar are shown in the table below (table in pure English):
|
Item |
Technical Parameter |
|
Product Name |
30CrMnTi Gear Steel Round Bar |
|
Executive Standard |
GB/T 3077-2015 |
|
Available Diameter Specifications |
Φ18–80mm, Φ45mm, Φ50mm, Φ55–100mm, Φ75mm, Φ80mm, Φ85mm, Φ100mm, Φ110mm, Φ120mm, Φ140mm, Φ160mm, Φ180mm, Φ200mm, Φ260–270mm |
|
Delivery Condition |
Hot Rolled / Normalized |
|
Surface Quality |
No cracks, folds, scratches, pits or other defects |
|
Dimension Tolerance |
National standard tolerance, high-precision tolerance customizable |
|
Delivery Hardness |
≤ 229 HB |
|
Processing Service |
Fixed-length cutting, polishing, straightening customizable |
Core Advantages
1. Stable Grain Structure: Unique titanium grain refinement technology effectively prevents grain coarsening during high-temperature carburizing, ensuring uniform microstructure and stable performance of finished parts.
2. Superior Toughness & Hardness Matching: After heat treatment, the surface reaches high hardness and excellent wear resistance, while the core maintains high toughness, resisting impact, torsion and alternating fatigue damage.
3. Low Heat Treatment Deformation: Precise component control ensures small quenching deformation, high dimensional accuracy and low post-processing rejection rate.
4. High Steel Purity: Strictly control S and P impurity elements, with clean internal quality, no porosity or inclusions, greatly extending the service life of transmission parts.
5. Complete Specification Coverage: Full range of diameter specifications from small to large sizes, realizing one-stop procurement for diverse processing needs.
6. Excellent Machinability: Good cutting, forging and heat treatment process performance, suitable for mass industrial production of mechanical transmission components.
Main Application Fields
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Automotive Industry
Heavy-duty truck gearbox gears, drive gears, gear shafts, transmission shafts and core transmission components.
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Construction Machinery
Heavy-load gears, worm gears, spindle parts and reduction gear assemblies for excavators, loaders, cranes and other engineering equipment.
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Agricultural Machinery
Drive gears, reduction gear sets and impact-resistant transmission parts for large tractors and farm machinery.
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General Mechanical Equipment
High-strength wear-resistant gears and key transmission components for industrial machinery and automation equipment.
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Mining & Metallurgical Machinery
Heavy-duty gear accessories for mining and metallurgical equipment operating under long-term alternating load and harsh working conditions.
Packaging & Services
Packaging: Adopt standard export seaworthy packaging. Steel round bars are bundled and fixed with high-strength steel strips, wrapped with waterproof kraft paper and plastic film for full moisture-proof and rust-proof protection. Each bundle is permanently marked with grade, specification, heat number, batch number and execution standard to avoid damage and rust during long-distance sea and land transportation.
Services: Provide complete original Mill Test Certificate (MTC) with full chemical and mechanical property data. Support SGS, BV third-party inspection and factory witness testing. Provide customized processing such as fixed-length cutting, surface polishing and straightening. Flexible trade terms including FOB, CFR, CIF, DAP. Offer professional technical services including heat treatment process guidance, steel grade selection and machining optimization solutions.
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- WhatsApp: +86-185 9567 2991
- Email: martinliu@rongtianmetal.com
- Tel: +86-185 9567 2991
- Address: 8F, Bldg 2, Jinke Zhihui Valley No. 65 Hongyuan Rd., Jinshui Dist. Zhengzhou, China.
