For girth gears, pinions, main shafts, roll shafts, pins, sprockets and heavy-duty fasteners. Drive parts carry loads: assess materials together with the load spectrum, dimensions, heat treatment, tooth or journal requirements and nondestructive inspection.
Quenched and tempered alloy steels provide section hardenability, strength, toughness and fatigue resistance. Carburising steels combine hard tooth surfaces with a tough core for contact fatigue and bending loads. Induction hardening, flame hardening and nitriding require specified procedures and effective case depths. The material name alone does not define the manufacturing route.
Parts are grouped by function below. Specify each part individually using its OEM drawing number, dimensions, loads and original material.
Check module, tooth count, pressure angle, hardening method, effective case depth, flank hardness and mating gear requirements.
Specify material and heat treatment for large shafts together with forging quality, sampling positions, ultrasonic inspection and straightening records.
Select pins and bushings, or sprockets and chain links, as mating systems. Increasing the hardness of one part alone may be detrimental.
Use this information for engineering review; material substitution requires the part drawings.
| Part / Position | Main Loads and Failure Modes | Material and Process Options | Required Checks |
|---|---|---|---|
| Large Open Girth Gears | Tooth root bending, flank contact fatigue, pitting, uneven loading and installation distortion. | Cast or forged alloy steels, quenched and tempered or surface hardened to the drawing, with control of tooth and rim quality. | Segmented construction, tooth geometry, material standard, hardness distribution, runout, contact pattern and NDT. |
| Pinions / Gear Shafts | Repeated contact, combined bending and torsion, scuffing, spalling and journal wear. | Quenched and tempered alloy steel, carburising steel or the specified surface-hardening process. | Mating girth gear, effective case depth, core properties, journals and keyways, tooth grinding and dynamic balance. |
| Main Shafts / Roll Shafts / Eccentric Shafts | Bending, torsion, impact, stress concentrations and high-cycle or low-cycle fatigue. | High-hardenability quenched and tempered forged steel is a common option, with local journal surface treatment where specified. | Forging ratio, maximum section, heat treatment, sampling positions, UT/MT, straightness, transition radii and surface roughness. |
| Sprockets and Chain Pins | Meshing impacts, edge indentation, sliding wear, shear, corrosion and contamination. | A quenched and tempered core with local surface hardening; match pins and bushings as a sliding pair. | Link dimensions, loads, mating materials, hardened zones, lubrication, contamination and assembly clearance. |
| Tie Rods, Hammer Shafts and Fasteners | Impact, alternating tension and compression, shear, thread root fatigue and loosening. | Strong, tough alloy steel with controlled quenching and tempering; specify mechanical properties and surface protection according to risk. | Strength class, threads and fillets, preload, impact requirements, decarburisation and surface defects. |
Material compliance is only the starting point for drive parts. Verify finished heat treatment, geometric accuracy, surface quality and assembly interfaces.
Check heat identification, chemistry, forging or casting requirements and traceability; specify sampling positions for large sections.
Record quenching and tempering, carburising or surface hardening, and check hardness, effective case depth and core properties against the drawing.
Use UT, MT or PT as appropriate to the risk. Check tooth geometry, runout, journals, keyways, radii and mating dimensions.
Check contact and backlash in gear pairs, dynamic balance or runout in rotating parts, and clearance and lubrication in sliding pairs.
Use the part pages to check OEM drawing numbers, spare part numbers, applicable models, dimensions and inquiry requirements.
Technical References: Use the applicable ISO 6336 series and OEM drawings for spur and helical cylindrical gear load capacity. ASTM A29/A29M and ASTM A322 cover relevant steel bar requirements; forgings require acceptance to their own product specification. Grades, heat treatment and inspection follow the customer drawings and technical agreement.
Please provide the equipment model, OEM drawing or spare part number, complete dimensions, power and speed, current material and heat treatment, failure photographs, quantity and acceptance standards.
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