S45C Round Bar Carbon Steel
S45C round bar is a medium-carbon steel grade widely used in machinery, automotive components, and general engineering. It offers excellent balance between strength, hardness, and machinability. Huaxia-Steel supplies S45C round bars in hot-rolled, peeled, and ground conditions with full mill certification and third-party inspection.
Product Overview
S45C (JIS G 4051) is the Japanese industrial standard equivalent of C45 (DIN), 1045 (AISI/ASTM), and C45E (EN). It contains approximately 0.42–0.48% carbon, giving it higher strength than low-carbon grades like Q235 or SS400 while maintaining good weldability and machinability.
Standard Specifications
| Standard | Grade | Carbon (C) | Tensile (MPa) |
|---|---|---|---|
| JIS G 4051 | S45C | 0.42–0.48% | ≥ 570 |
| DIN EN 10083 | C45 / C45E | 0.42–0.50% | ≥ 580 |
| AISI / ASTM | 1045 | 0.43–0.50% | ≥ 585 |
Available Sizes and Tolerances
| Diameter (mm) | Length (m) | Tolerance | Surface |
|---|---|---|---|
| 10 – 50 | 4 – 6 | h9 / h11 | Hot-rolled, Peeled |
| 50 – 100 | 4 – 6 | h11 | Hot-rolled, Ground |
| 100 – 250 | 3 – 6 | +2 / -0 | Hot-rolled, Forged |
| 250 – 400 | 3 – 6 | +5 / -0 | Forged, Annealed |
Mechanical Properties
- Yield Strength: ≥ 345 MPa
- Tensile Strength: 570–700 MPa
- Elongation: ≥ 14%
- Hardness (HB): 170–230 (as-rolled); up to 55 HRC after quenching
Applications
- Shafts, axles, and crankshafts
- Gears, bolts, and fasteners
- Hydraulic cylinder rods
- Machinery structural parts
- Automotive and agricultural equipment
Heat Treatment Options
S45C responds well to heat treatment. Common processes include:
- Normalizing: Refines grain structure after forging
- Quenching + Tempering: Increases hardness and wear resistance
- Annealing: Improves machinability for complex machining
Quality Assurance
- Mill test certificate (JIS G 4051 compliant)
- Third-party inspection by SGS, BV, or TÜV
- Dimensional inspection per ISO 286
- Surface defect inspection (visual + ultrasonic upon request)
Packing and Shipping
Bars are bundled with steel straps, ends protected with caps, and wrapped in waterproof kraft paper. Seaworthy packing is available for container or break-bulk shipment. Marking includes heat number, grade, size, and weight per bundle.
Request a Quote for S45C Round Bar
Send us your required diameter, length, quantity, and surface finish. Contact Huaxia-Steel for competitive pricing, mill certification, and global delivery.
