AISI 1045 Carbon Steel Round Bar — Factory Direct Supplier
Premium Medium-Carbon Steel Round Bar for Machining, Forging & Industrial Applications
AISI 1045 (also known as C45, S45C, or CK45) is a medium-carbon steel round bar that delivers an optimal balance of strength, hardness, and machinability. Huaxia-steel supplies 1045 round bars in hot-rolled and cold-drawn conditions, in diameters from 6 mm to 350 mm, with full mill test certificates and ISO 9001 quality assurance.
> Ready for a quote? Get Factory Direct Pricing →
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1045 Carbon Steel Round Bar — Quick Specs
| Property | Value |
|---|---|
| Grade | AISI 1045 / SAE 1045 |
| Equivalent Standards | DIN C45 / JIS S45C / GB 45# / EN 1.0503 / BS 080M46 |
| Carbon Content | 0.43% – 0.50% |
| Condition | Hot-Rolled (HR) / Cold-Drawn (CD) / Peeled & Ground |
| Diameter Range | 6 mm – 350 mm (1/4″ – 14″) |
| Length | 3–6 m random length (cut-to-size available) |
| Tolerance | h9 (cold-drawn), h11 (hot-rolled), or per request |
| Surface Finish | Black (HR), Bright (CD), Polished (Ground) |
| MOQ | 1 ton (sample orders welcome) |
| Delivery Time | 7–15 days for stock sizes, 20–30 days for custom |
| Certification | EN 10204 3.1/3.2 MTC, ISO 9001 |
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Chemical Composition of AISI 1045
| Element | C | Si | Mn | P (max) | S (max) |
|---|---|---|---|---|---|
| Min | 0.43 | 0.10 | 0.60 | — | — |
| Max | 0.50 | 0.40 | 0.90 | 0.040 | 0.050 |
The 0.43–0.50% carbon content provides excellent response to heat treatment — quenching and tempering can push tensile strength above 850 MPa while retaining good toughness.
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Mechanical Properties
| Property | Hot-Rolled | Cold-Drawn | Quenched & Tempered |
|---|---|---|---|
| Tensile Strength (MPa) | 570–700 | 620–780 | 700–850 |
| Yield Strength (MPa) | 300–400 | 350–480 | 450–600 |
| Elongation (%) | 12–16 | 10–14 | 8–12 |
| Hardness (HB) | 170–210 | 190–230 | 210–280 |
| Impact Energy (J) | 20–35 | 15–25 | 20–30 |
> Need specific mechanical properties for your application? Tell us your requirements →
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Available Sizes & Tolerances
Standard Diameter Range
| Condition | Diameter Range | Tolerance |
|---|---|---|
| Hot-Rolled | 6 mm – 350 mm | ±0.5 mm (h11) |
| Cold-Drawn | 6 mm – 120 mm | ±0.05 mm (h9) |
| Peeled | 20 mm – 200 mm | ±0.1 mm (h10) |
| Ground | 6 mm – 100 mm | ±0.02 mm (h8) |
Popular Sizes in Stock
| Diameter (mm) | Diameter (inch) | Condition | Availability |
|---|---|---|---|
| 10 | 3/8″ | Cold-Drawn | ✅ In Stock |
| 12 | 1/2″ | Cold-Drawn | ✅ In Stock |
| 16 | 5/8″ | Cold-Drawn | ✅ In Stock |
| 20 | 3/4″ | Hot-Rolled / Cold-Drawn | ✅ In Stock |
| 25 | 1″ | Hot-Rolled / Cold-Drawn | ✅ In Stock |
| 30 | 1-3/16″ | Hot-Rolled | ✅ In Stock |
| 40 | 1-9/16″ | Hot-Rolled | ✅ In Stock |
| 50 | 2″ | Hot-Rolled / Cold-Drawn | ✅ In Stock |
| 60 | 2-3/8″ | Hot-Rolled | ✅ In Stock |
| 80 | 3-1/8″ | Hot-Rolled | ✅ In Stock |
| 100 | 4″ | Hot-Rolled | ✅ In Stock |
| 150 | 6″ | Hot-Rolled | ✅ In Stock |
| 200 | 8″ | Hot-Rolled | ✅ In Stock |
> Don’t see your size? We offer custom cutting and processing. Request Custom Sizing →
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Manufacturing Process
1. Raw Material Selection
We source premium-quality continuous-cast billets from certified Chinese steel mills. Each billet is verified for chemical composition via spectrometer before entering production.
2. Hot Rolling
Billets are heated to 1,150–1,250°C and rolled through a series of stands to achieve the target diameter. The hot-rolling process refines grain structure and improves mechanical properties.
3. Cold Drawing (for cold-drawn bars)
Hot-rolled bars are pickled, coated, and drawn through precision dies to achieve tight dimensional tolerances (h9) and a smooth, bright surface finish.
4. Straightening & Cutting
All bars are machine-straightened to within 1 mm/m and cut to specified lengths (typically 3–6 m). Cut-to-size and precision cutting services are available.
5. Surface Treatment
Optional services include:
- Peeling: removes decarburized surface layer for improved fatigue resistance
- Grinding: achieves h8 tolerance and mirror-like finish for precision applications
- Phosphating: improves cold-heading workability
- Coating: anti-corrosion oil for export shipping
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Quality Assurance
Inspection Process
| Stage | Test | Standard |
|---|---|---|
| Incoming billet | Spectrometer analysis | ASTM E415 |
| During rolling | Dimensional check every 50 bars | GB/T 702 |
| Post-production | Tensile + yield + elongation | ASTM A370 |
| Hardness | Brinell hardness test | ASTM E10 |
| Surface | Visual + magnetic particle | ASTM E709 |
| Final | Ultrasonic flaw detection | ASTM E2375 |
Certifications Provided
- ✅ EN 10204 3.1 Mill Test Certificate (standard)
- ✅ EN 10204 3.2 Certificate (with third-party inspection — SGS, BV, TUV)
- ✅ ISO 9001:2015 Quality Management
- ✅ Material Test Report (MTR) with full traceability
- ✅ RoHS / REACH compliance on request
> Want to see our MTC samples? Request Sample Documents →
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Applications of 1045 Carbon Steel Round Bar
Machinery & Equipment
- Shafts, spindles, and axles
- Gears, pinions, and gear shafts
- Couplings and connecting rods
- Guide rails and linear motion components
Automotive
- Steering components
- Transmission shafts
- Suspension parts
- Engine connecting rods
Oil & Gas
- Drill collars and tool joints
- Valve stems and fittings
- Pump shafts
- Pipeline accessories
Construction
- Heavy-duty bolts and studs
- Anchor bolts
- Structural pins and dowels
- Crane components
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Why Choose Huaxia-Steel for 1045 Round Bar?
1. Direct Factory Pricing
We partner directly with top-tier Chinese steel mills, eliminating middleman markups. Our clients typically save 10–20% compared to trading companies.
2. Full-Size Range (6–350 mm)
From precision cold-drawn 6 mm bars to large-diameter hot-rolled 350 mm rounds, we cover the full spectrum of 1045 round bar sizes.
3. Complete Processing Services
Cut-to-length, peeling, grinding, heat treatment, and custom packaging — all under one roof. No need to coordinate multiple suppliers.
4. Strict Quality Control
Every batch undergoes spectrometer, tensile, hardness, and ultrasonic testing. Full traceability from billet to finished bar.
5. Fast Global Shipping
7-day dispatch for stock sizes. FOB Shanghai, CIF, or DDP delivery to 60+ countries. We handle all export documentation.
6. Low MOQ & Flexible Terms
1-ton MOQ for standard sizes. Sample orders (50–100 kg) welcome for new customers. L/C, T/T, and Western Union accepted.
> Get a free quote within 24 hours → Contact Us Now →
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1045 vs Other Medium Carbon Steel Grades
| Grade | Carbon (%) | Tensile (MPa) | Hardness (HB) | Machinability | Best For |
|---|---|---|---|---|---|
| 1045 | 0.43–0.50 | 570–850 | 170–280 | ★★★★ | General-purpose shafts, gears |
| 1040 | 0.37–0.44 | 520–760 | 150–240 | ★★★★★ | Lower-stress components |
| 1050 | 0.48–0.55 | 620–900 | 180–300 | ★★★ | Higher-wear applications |
| 1141 (resulfurized) | 0.37–0.45 | 550–800 | 160–260 | ★★★★★ | High-volume machining |
| S45C (JIS equivalent) | 0.42–0.48 | 560–830 | 170–270 | ★★★★ | Asian market standard |
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International Standards & Equivalents
| Standard | Grade | Country |
|---|---|---|
| AISI/SAE | 1045 | USA |
| DIN | C45 / CK45 | Germany |
| JIS | S45C | Japan |
| GB | 45# | China |
| EN | 1.0503 / C45 | Europe |
| BS | 080M46 | UK |
| AFNOR | XC45 / AF65C45 | France |
| UNI | C45 | Italy |
| GOST | 45 | Russia |
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Packaging & Shipping
| Packaging Type | Description | Best For |
|---|---|---|
| Standard bundle | Steel strapped, 2–3 tons per bundle | Bulk orders |
| Wooden crate | Fumigated wood box with separator | Export shipping |
| Plastic-coated | Individual PE film wrapping | Anti-corrosion |
| Custom | Per buyer requirements | Special projects |
All export shipments include:
- Fumigation certificate (for wooden packaging)
- Packing list with weight and dimensions
- Country of origin certificate (CO)
- Mill test certificate (EN 10204 3.1 or 3.2)
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Frequently Asked Questions
What is the difference between 1045 hot-rolled and cold-drawn round bar?
Hot-rolled 1045 has a black oxide surface and looser tolerances (±0.5 mm), making it more economical for larger diameters (50–350 mm). Cold-drawn 1045 has a bright, smooth surface with tight tolerances (±0.05 mm) and higher dimensional accuracy, ideal for precision machining (6–120 mm).
Can you supply 1045 round bar in quenched and tempered condition?
Yes. We offer Q&T heat treatment to achieve tensile strengths of 700–850 MPa and hardness of 210–280 HB. Minimum order for heat-treated bars is 2 tons.
What is the minimum order quantity?
Standard MOQ is 1 metric ton. Sample orders of 50–100 kg are available for new customers to verify quality before placing bulk orders.
How long does delivery take?
Stock sizes ship within 7 days. Custom sizes (cut-to-length, special tolerance, or heat-treated) take 20–30 days. Shipping to most ports takes 15–35 days depending on destination.
Do you provide third-party inspection?
Yes. We welcome SGS, BV, TUV, or any third-party inspection of your choice. We also provide EN 10204 3.2 certificates with third-party endorsement.
What is the price of 1045 carbon steel round bar?
Pricing depends on diameter, condition (hot-rolled vs cold-drawn), quantity, and market conditions. Contact us for a real-time quote →
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Request Your 1045 Round Bar Quote Today
Huaxia-steel is your trusted direct supplier for AISI 1045 carbon steel round bars. With complete size coverage (6–350 mm), full processing capabilities, and strict quality control, we deliver factory-direct pricing with export-grade reliability.
Get Your Free Quote → | Download Full Spec Sheet (PDF) →
Huaxia-steel — Your Reliable Carbon Steel Supplier. ISO 9001 Certified. Exporting to 60+ Countries Worldwide.
