Gear Steel Bright Bar
Introduction:
30CrMnTi gear steel bright bar is a high-precision carburizing alloy gear steel manufactured in accordance with GB/T 3077-2015 standard, specially used for heavy-duty and high-stability transmission components. Adopting optimized Cr-Mn-Ti alloy proportion design with strictly controlled chemical composition and ultra-low harmful impurities, the steel features fine grain, stable metallographic structure and excellent comprehensive mechanical properties.
Product Overview
30CrMnTi gear steel bright bar is a high-precision carburizing alloy gear steel manufactured in accordance with GB/T 3077-2015 standard, specially used for heavy-duty and high-stability transmission components. Adopting optimized Cr-Mn-Ti alloy proportion design with strictly controlled chemical composition and ultra-low harmful impurities, the steel features fine grain, stable metallographic structure and excellent comprehensive mechanical properties. According to customer precision and surface requirements, the product can be selectively finished by cold drawing, centerless turning (peeling) and centerless grinding. It possesses superior hardenability, outstanding wear resistance, fatigue resistance and impact toughness, and avoids grain coarsening under high-temperature carburizing. With low heat treatment deformation and high dimensional stability, the finished bright bar presents mirror smooth surface, no oxide scale and ultra-precise tolerance. After carburizing and quenching, the workpiece features high surface hardness and tough core, perfectly adapting to long-term alternating load, heavy impact and friction working conditions. It is the preferred high-quality material for manufacturing high-precision heavy-duty gears, gear shafts and transmission 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 |
Mirror bright, oxide-free, crack-free, scratch-free, pit-free |
|
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 & Fine Grain Structure: The unique titanium grain refinement technology effectively prevents grain coarsening during high-temperature carburizing, ensuring uniform microstructure and consistent performance of finished bright bars.
2. Excellent Hardness & Toughness Match: After heat treatment, the surface achieves ultra-high hardness and wear resistance, while the core retains high toughness, effectively resisting impact, torsion and alternating fatigue damage.
3. Flexible Precision Processing Options: Support three optional finishing processes: cold drawing for tight dimensional tolerance control, centerless turning (peeling) for removing surface defects and decarburized layer, centerless grinding for mirror ultra-smooth surface, meeting different precision grade requirements.
4. Low Heat Treatment Deformation: Precise chemical composition control minimizes quenching deformation, ensuring high dimensional accuracy of gear parts and reducing post-processing rejection rate.
5. Ultra-High Steel Purity: Strict control of S and P harmful impurities, internal structure compact and clean without porosity or inclusions, greatly improving the service life of transmission components.
6. Excellent Machinability & Consistency: Superior cutting, forging and heat treatment performance, stable batch consistency, fully suitable for mass production of high-precision mechanical transmission parts.
Main Application Fields
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Automotive Transmission System
High-precision bright bars for heavy-duty truck gearbox gears, drive gears, gear shafts and transmission core components.
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Construction Machinery Equipment
Precision bright bar blanks for excavators, loaders, cranes and other engineering machinery heavy-load gears, worm gears, spindle parts and reducer assemblies.
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Agricultural Machinery Manufacturing
Impact-resistant drive gears, reduction gear sets and transmission parts for large tractors and professional farm machinery equipment.
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General Industrial Machinery
High-strength and wear-resistant precision gears and key transmission components for automated production equipment and industrial machinery.
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Mining & Metallurgical Equipment
Heavy-duty gear accessories made of high-precision bright bars, suitable for long-term alternating load and harsh working conditions of mining and metallurgical machinery.
Packaging & Services
- 1. Professional Exclusive Packaging for Bright Bars: Adopts special scratch-proof and rust-proof precision packaging for bright bars, wrapped with thickened waterproof film on the outer layer and firmly bundled and fixed. High-precision and long-size products can be customized with solid wooden box packaging, completely avoiding collision, scratches, deformation and rust during transportation, suitable for long-distance sea and land transportation.
- 2. Complete Quality Certification: Provide official Mill Test Certificate (MTC 3.1) with full chemical composition and mechanical property data. Support SGS, BV and other third-party inspection and factory witness testing.
- 3. Flexible Order & Shipment: Support small-batch trial order and large-batch bulk supply, mixed-specification container loading is acceptable.
- 4. Custom Deep Processing: Optional cold drawing, centerless turning (peeling), centerless grinding, fixed-length cutting, surface straightening and polishing customization.
- 5. Professional Technical Support: Provide gear steel heat treatment process guidance, material selection optimization and mechanical processing solution consultation.
- 6. Diversified Trade Terms: Support FOB, CFR, CIF, DAP and other international trade methods to meet different customer delivery requirements.
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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.
