High Speed Steel Round bar Q345 200mm Carbon Steel Round bar Roller Bearing with Shaft
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- Rich variety of materials
- Overview
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Product Induction
This product is a general-purpose shaft component featuring medium-to-low strength, high plasticity, and excellent weldability. It is manufactured from hot-rolled Q345 round steel as raw material, processed through turning, grinding, polishing, and surface treatment. Customization is available for materials including carbon steel and stainless steel. Applications include agricultural machinery drive shafts, logistics conveyor rollers, elevator guide rods, injection molding machine tie rods, wind turbine pitch bearing inner rings, robotic seventh-axis guide rails, and wire rope drum mandrels for port cranes.
Specification
| Product Name | High Speed Steel Round bar Q345 200mm Carbon Steel Round bar Roller Bearing with Shaft |
| Technique | Hot Rolled,Cold Drawn,Forged |
| Grade | Q345（Low alloy high-strength structural steel）,all grades can be produced |
| Length | can be customized,cut to length |
| Section Shape | Round |
| OEM/ODM | available |
| Processing Service | CNC Turning, Milling, Drilling |
| Surface Treatment | Polishing, Anodizing, Black Oxided, Passivation, Electroplating |
| Certification | ISO 9001/RoHS |
| Application |
agricultural machinery drive shafts, logistics conveyor rollers elevator guide rods, injection molding machine tie rods wind turbine pitch bearing inner rings, robotic seventh-axis guide rails and wire rope drum mandrels for port cranes |
Q345 Chemical Composition
| Grade | C max | Mn max | Si max | P max | S max | Cr max | Ni max | V | Mo max |
| Q345 | 0.2 | 1.7 | 0.5 | 0.035 | 0.035 | 0.3 | 0.3 | 0.02-0.15 | 0.1 |
Q345 Mechanical Properties
| Grade | tensile strength（MPa） | yield strength（MPa） | Elongation% |
| Q345 | 470–630 | 285-345 | 20-21 |
Machinery Equipment
| Equipment Name | Quantity | Configuration | Efficiency |
| 5000T Rapid Forging System | 1 set |
Equipped with one 50-ton operating machine; One 30-ton material handling machine; |
|
| 2000T Rapid Forging System | 1 set |
Equipped with two 20-ton operating machines; One 15-ton material handling machine; |
|
| Heating Furnace | 9 units |
4m chamber furnaces: 4 units; 5m chamber furnaces: 4 units; 12m bogie hearth furnace: 1 unit; |
4m charging capacity: 70 tons; 5m charging capacity: 90 tons; 12m charging capacity: 120 tons; |
| Annealing Furnace | 8 units |
8m car-bottom furnaces: 3 units; 12m car-bottom furnaces: 5 units; |
8m charging capacity: 120 tons; 12m charging capacity: 150 tons; |
| Heat Treatment Furnace | 3 units |
12m car-bottom furnace, 2 units; 20m bell-type furnace, 1 unit; |
12m charging capacity: 150 tons; 20m charging capacity: 100 tons; |
| Slow-Cooling Pit | 1 units | 29.5m×11m×2.5m; | Loading capacity: 1500 tons; |
| Water Basin | 1 building | 20m×5m×6m |
Steel Shaft Production Process
1.Cutting and Trimming:Sawing/Grinding Cutting Machine: Cut to specified length with end face taper ≤1 mm, leaving 1–2 mm finishing allowance.
2.CNC Turning:Rough Turning: Single-pass operation to rapidly remove scale and decarburized layer.
3.Semi-Finish Turning: Leave 0.3 mm allowance, adjust concentricity ≤0.05 mm, ensuring uniform allowance for subsequent grinding. Finish turning: Apply 5% emulsion cutting fluid spray. Achieve dimensions to IT9-IT10 tolerance and Ra 1.6 µm surface roughness. If center holes are required, simultaneously drill A2/5 60° center holes at both ends.
4.Heat treatment: Quenching and tempering + high-frequency hardening.
5.Surface treatment: Phosphating + soap treatment; Hard chrome plating; Shot peening.
6.Cleaning-Inspection-Packaging: Ultrasonic degreasing + hot water rinse, hot air drying at 80°C; Full-dimension laser scanning to record roundness, cylindricity, straightness; Magnetic particle/ultrasonic spot checks for surface cracks; Apply rust-preventive oil, seal with PE shrink wrap + plastic end caps, transport on wooden pallets or steel frames to prevent lifting impacts.
Packing and Transport
FAQ
Q: Should we select hot-rolled or cold-drawn stock?
A: For ≤φ50 mm and Ra≤0.8 µm, use cold-drawn bright bars directly to skip rough turning. For >φ50 mm or complex steps, use hot-rolled stock with a 1-2 mm allowance.
Q: Can Q345 plain shafts be welded to flanges?
A: No preheating required for wall thickness <25 mm and ambient temperature >0°C. Use ER50-6 welding wire with CO₂ gas, maintain interpass temperature ≤150°C, and perform stress relief at 550°C post-weld. Impact toughness still reaches 27 J.
Q: Is grinding required before hard chrome plating?
A: Precision grinding to Ra ≤ 0.2 µm is mandatory, otherwise the chrome layer will replicate tool marks. Post-plating polishing to Ra ≤ 0.1 µm is required, with no white rust appearing after 48 hours of salt spray testing.
Q: What is the maximum length achievable while maintaining straightness?
A: For a standard 6-meter bed on a centerless grinder, straightness is 0.3 mm over the entire length. To achieve 0.05 mm over 6 meters, dual-head grinding followed by medium-frequency quenching and precision straightening is required, with grinding performed in a temperature-controlled chamber.
Q: How can I get your quotation as soon as possible?
A:Please contact:
Email:[email protected]
Wechat/whatsapp/mobile: + 86 13512028034
