High-Quality 4140/4130/4340 Carbon Alloy Steel Round Bars from China Suppliers - Hot/Rolled, Thickness 6-600mm
Precision-machined carbon steel round bars are designed to meet structural load-bearing and precision machining requirements, encompassing a variety of grades:
We offer flexible, project-specific specifications: diameters ranging from 3 mm (micro precision pins) to 500 mm (heavy-duty structural bars), standard lengths up to 6 meters, and custom cutting, chamfering, or threading services are available. Manufacturing processes are matched to steel grades — large-diameter structural bars are hot-rolled (ensuring grain refinement and toughness), while small-diameter precision bars are cold-drawn (achieving tight dimensional tolerances of ±0.03 mm and a smooth surface with Ra≤1.6μm). Optional surface treatments include blackening, phosphating (rust prevention), or polishing.
These round bars play a crucial role across multiple industries:
Products fully comply with GB/T 702, ASTM A108, and ISO 683-1 standards. Each batch undergoes rigorous quality verification including ultrasonic testing, tensile/impact testing, and hardness (HB/HRC) measurement. We offer bulk supply, just-in-time delivery, and technical consulting services.
| Product Name | AISI 4140 Flat Angle 1060 C45 CK45 1095 1020 A36 Q235 SAE 1016 1084 Low Round Carbon 1045 1050 1055 Steel Bar |
| Standard | ASTM A106, ASTM A53, API 5L Gr.B, DIN17175, DIN1629 |
| Outer Diameter | 20mm – 610mm |
| Wall Thickness | 4mm – 70mm |
| Dia Tolerance | Controlled within standard: OD ±1%, WT ±10% |
| Materials | 10#, 20#, 45#, 16Mn, A106 (B, C), A53 (A, B), API J55, API K55, Q235, Q345, ST35.8, ST37, ST42, ST45, ST52 |
| Inspection | ISO, BV, SGS, MTC |
| Packing | Waterproof paper and steel strip packed. Standard export seaworthy package. Suitable for all kinds of transport, or as required. |
| Supply Ability | 1,000 metric tons / month |
| MOQ | 5 metric tons; sample order accepted |
