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Steel Round Bar Supplier in China
SKSteel is a professional Steel Round Bar supplier in China, providing a wide range of mild steel round bars and cold drawn steel round bars for construction, machining, fabrication, machinery, infrastructure and industrial projects. As a leading China steel round bar stockist, we maintain ready stock round bar in various diameters and grades for immediate shipment worldwide.
Q235B Steel Round Bar / Q355B Steel Round Bar / ASTM A36 Round Bar / ASTM A572 Grade 50 Round Bar / JIS G3101 SS400 Round Bar / S235JR Round Bar / S355JR Round Bar / Customized Steel Round Bar
| Standards | Grade |
|---|---|
| GB Standards | Q235B, Q355B |
| ASTM Standards | A36, A572 Grade 50 |
| JIS Standards | SS400, SM490 |
| EN Standards | S235JR, S275JR, S355JR |
| Standard | Grade | C % | Si % | Mn % | P % | S % | Cr % | Ni % | Other elements | Sample |
|---|---|---|---|---|---|---|---|---|---|---|
| ASTM A36/A36M | A36 | <=0.26 | <=0.40 | Varies by product / thickness | <=0.040 | <=0.050 | - | - | Cu >=0.20 when specified | Get Sample |
| ASTM A108 / SAE J403 | 1018 | 0.15-0.20 | - | 0.60-0.90 | <=0.040 | <=0.050 | - | - | - | Get Sample |
| EN 10025-2 | S235JR | <=0.17 | - | <=1.40 | <=0.035 | <=0.035 | - | - | N <=0.012, Cu <=0.55 | Get Sample |
| EN 10025-2 | S355JR | <=0.24 | <=0.55 | <=1.60 | <=0.035 | <=0.035 | - | - | N <=0.012, Cu <=0.55 | Get Sample |
| JIS G3101 | SS400 | Not specified | Not specified | Not specified | <=0.050 | <=0.050 | - | - | - | Get Sample |
| GB/T 700 | Q235B | <=0.20 | <=0.35 | <=1.40 | <=0.045 | <=0.045 | - | - | - | Get Sample |
| ASTM A108 / SAE J403 | 1045 | 0.43-0.50 | - | 0.60-0.90 | <=0.040 | <=0.050 | - | - | - | Get Sample |
| EN 10083-2 | C45 | 0.42-0.50 | <=0.40 | 0.50-0.80 | <=0.045 | <=0.045 | <=0.40 | <=0.40 | Mo <=0.10 | Get Sample |
| JIS G4051 | S45C | 0.42-0.48 | 0.15-0.35 | 0.60-0.90 | <=0.030 | <=0.035 | - | - | - | Get Sample |
| GB/T 699 | 45 steel | 0.42-0.50 | 0.17-0.37 | 0.50-0.80 | <=0.035 | <=0.035 | <=0.20 | <=0.30 | Cu <=0.25 | Get Sample |
| Standard | Grade | Yield strength MPa | Tensile strength MPa | Elongation % | Sample |
|---|---|---|---|---|---|
| ASTM A36/A36M | A36 | >=250 | 400-550 | >=20 | Get Sample |
| ASTM A108 / SAE J403 | 1018 | >=370 typical cold drawn | 440-540 typical cold drawn | >=15 typical | Get Sample |
| EN 10025-2 | S235JR | >=235 | 360-510 | >=26 | Get Sample |
| EN 10025-2 | S355JR | >=355 | 470-630 | >=22 | Get Sample |
| JIS G3101 | SS400 | >=245 | 400-510 | >=17 | Get Sample |
| GB/T 700 | Q235B | >=235 | 370-500 | >=26 | Get Sample |
| ASTM A108 / SAE J403 | 1045 | >=310 typical | 565-700 typical | >=16 typical | Get Sample |
| EN 10083-2 | C45 | >=305 normalized typical | 570-700 normalized typical | >=16 typical | Get Sample |
| JIS G4051 | S45C | >=345 typical | >=570 typical | >=20 typical | Get Sample |
| GB/T 699 | 45 steel | >=355 typical | >=600 typical | >=16 typical | Get Sample |
Theoretical weight is calculated by diameter (mm) * diameter (mm) * 0.00617 = kg/m. Final available sizes and tolerance should be confirmed according to mill production and order quantity.
| DIA | kg/m | DIA | kg/m | Sample |
|---|---|---|---|---|
| 5.5MM | 0.186 | 30MM | 5.55 | Get Sample |
| 6MM | 0.222 | 31MM | 5.93 | Get Sample |
| 6.5MM | 0.260 | 32MM | 5.93 | Get Sample |
| 7MM | 0.302 | 33MM | 6.71 | Get Sample |
| 8MM | 0.395 | 34MM | 7.13 | Get Sample |
| 9MM | 0.499 | 35MM | 7.55 | Get Sample |
| 10MM | 0.617 | 36MM | 7.99 | Get Sample |
| 11MM | 0.746 | 38MM | 8.90 | Get Sample |
| 12MM | 0.888 | 40MM | 9.86 | Get Sample |
| 13MM | 1.04 | 42MM | 10.9 | Get Sample |
| 14MM | 1.21 | 45MM | 12.5 | Get Sample |
| 15MM | 1.21 | 48MM | 14.2 | Get Sample |
| 16MM | 1.58 | 50MM | 15.4 | Get Sample |
| 17MM | 1.78 | 53MM | 17.3 | Get Sample |
| 18MM | 2 | 55MM | 18.6 | Get Sample |
| 19MM | 2.23 | 56MM | 19.3 | Get Sample |
| 20MM | 2.47 | 58MM | 20.7 | Get Sample |
| 21MM | 2.72 | 60MM | 22.2 | Get Sample |
| 22MM | 2.98 | 63MM | 24.5 | Get Sample |
| 23MM | 3.26 | 65MM | 26.0 | Get Sample |
| 24MM | 3.55 | 68MM | 28.5 | Get Sample |
| 25MM | 3.85 | 70MM | 30.2 | Get Sample |
| 26MM | 4.17 | 75MM | 34.7 | Get Sample |
| 27MM | 4.49 | 80MM | 39.5 | Get Sample |
| 28MM | 4.83 | 85MM | 44.5 | Get Sample |
| 29MM | 5.18 | 90MM | 49.9 | Get Sample |
Applications
Steel Round Bar is widely used for shafts, pins, fasteners, machinery parts, construction components, railings, frames, agricultural equipment, automotive parts, shipbuilding, forging, machining, repair work and general industrial maintenance.
Challenges & Needs
Dimensional Tolerance Issues
Internal Defects
Surface Defects
Steel Round Bar Export Packing and Loading
At SKSteel, all Steel Round Bars are packed in bundles according to international export standards with steel strips, wire rods or suitable straps to ensure safe transportation, efficient loading, and protection against damage during sea, rail, and truck transportation. The packing is suitable for container shipments, bulk vessel shipments, and project cargo deliveries worldwide. Especially for container shipment, SKSteel has considerable experience to load steel round bars into 20GP and 40HQ containers according to the specific sizes, bundle weight and customers’ requirements.
Why choose SKSteel as your Trusted China Steel Round Bar Supplier?
- Extensive Steel Round Bar Ready Stock for Fast Delivery
- Full Range of Diameters, Specifications and Grades
- Direct connections with leading steel round bar manufacturers
- 18 years of experience to ship steel round bar by 20GP, 40HQ container, and break bulk vessel
- Value-added processing services
- One-stop Structural Steel Supply
Value-Added Services
High-Precision Fabrication
Heat Treatment
Precision Surface Finishing
Transparent Delivery
Collaboration with SK STEEL
FAQ for Steel Supply Services
1.What is Steel Round Bar?
Steel Round Bar is a solid circular steel bar. It is widely used in machining, construction, fabrication, shafts, pins, supports and machinery parts because it can be cut, machined, welded, forged and processed for many industrial applications.
2.What is the difference between Hot Rolled Steel Round Bar and Cold drawn Steel Round Bar?
| Feature | Hot Rolled Steel Round Bar | Cold Drawn Steel Round Bar |
|---|---|---|
| Process | Rolled into shape while very hot | By pulled/drawn through dies at room temperature |
| Surface finish | Rougher, may have mill scale | Smoother, cleaner, brighter finish |
| Dimensional accuracy | Looser tolerances | Tighter tolerances and more consistent diameter |
| Strength/hardness | Generally lower strength than cold drawn | Usually higher tensile/yield strength due to work hardening |
| Ductility | More ductile, easier to form | Less ductile than hot rolled |
| Straightness | Less precise | Better straightness |
| Machinability | Good, but scale/variation can affect setup | Often better for precision machining |
| Cost | Lower cost | Higher cost due to extra processing |
| Typical uses | Construction, fabrication, general shafts, supports, welding projects | Precision shafts, pins, fasteners, machined components, bearing/fit applications |
3.Can SKSteel supply Stainless Round Bar?
Yes, SKSteel can supply Stainless Round Bar as well.
4.Can SKSteel provide further processing for Steel Round Bars?
Yes. We offer value-added processing services including:
Cutting
Drilling
Machining
Welding
Surface treatment
Painting Fabrication
5.What’s the difference between Round Bar and Square Bar?
Round Bar has a circular cross section and is commonly used for shafts, pins, machining and rotating components. Square Bar has equal flat sides and is often used for supports, frames, railings, forging and fabrication parts.