S235JR Carbon Steel Round Bar — Factory Direct Supplier | Huaxia-Steel
Product Overview
S235JR carbon steel round bar is a European-standard structural mild steel bar with a minimum yield strength of 235 MPa. It is one of the most widely used round bars for general engineering, fabrication and construction where good weldability and moderate strength are required at low cost. Huaxia-Steel stocks and exports S235JR round bars in a full size range with EN 10204 mill certificates and seaworthy packing, supplying both standard lengths and cut-to-length pieces to match your bill of materials.
Specification Table
| Item | Range / Value |
|---|---|
| Standard | EN 10025-2 |
| Diameter | 10 – 300 mm |
| Length | 6 m / 9 m or cut to length |
| Condition | Hot rolled, as-rolled |
| Yield strength | >=235 MPa |
| Tensile strength | 360 – 510 MPa |
| Elongation | >=26% |
| Surface | Black, pickled or turned |
Available Options
- Black hot rolled round bar
- Peeled / turned bar
- Bright drawn (on request)
- Cut-to-length pieces and chamfered ends
Manufacturing Standards
Produced to EN 10025-2 with EN 10204 3.1 mill certificates. Equivalent grades include ASTM A36, GB/Q235B and JIS SS400 for cross-referencing on export orders. We can issue the matching certificate for the standard your project requires, and provide the heat number traceability that fabricators and auditors expect.
Dimensional Tolerances
Hot rolled round bars are supplied to standard h11/h13 class tolerances on diameter depending on size, with straightness and ovality controlled to EN 10060. Turned and bright-drawn bars hold tighter limits for machined components. If your application needs a specific tolerance band, state it on the order and we will select the process (as-rolled, peeled or drawn) that meets it without over-specifying cost.
Machining and Fabrication
S235JR machines and welds easily, making it ideal for shafts, pins, brackets and frames. It cuts cleanly on saws and CNC equipment and responds well to bending and light forming. For threaded or precision parts, our turned or bright-drawn options hold tighter dimensional control. Preheat is generally not required for normal thicknesses, which keeps fabrication simple and fast on the shop floor.
Weight and Ordering Reference
A round bar weighs about 0.006165 x diameter(mm) squared per metre in kilograms, so a 50 mm bar is roughly 15.4 kg/m. We can quote either by length and piece count or by total tonnage, and we bundle standard lengths or cut pieces to your schedule. Providing the end-use and any critical dimensions helps us recommend the most cost-effective condition (black, peeled or drawn).
Applications
- Machined shafts and pins
- Structural and frame fabrication
- Brackets and connectors
- General engineering components
- Construction reinforcement details
- Mild steel fixtures and jigs
Quality Assurance
Bars are checked for diameter, straightness, surface and end condition. Mill certificates confirm chemistry and mechanical properties. Third-party inspection (SGS, BV, TUV) is available for critical orders, and ultrasonic or magnetic-particle testing can be arranged on request for safety-related components.
Packaging and Shipping
Round bars are bundled with steel straps, tagged with grade and heat number, and protected for export. We supply FOB, CIF and CFR to global destinations with seaworthy packing and can coordinate container or break-bulk shipment, including mixed loads with other steel products to save freight.
Dimensional Tolerance Reference
| Diameter (mm) | Tolerance h11 (mm) | Typical use |
|---|---|---|
| 10 – 18 | -0.11 to 0 | Precision parts |
| 18 – 30 | -0.13 to 0 | Shafts, pins |
| 30 – 50 | -0.16 to 0 | General engineering |
| 50 – 80 | -0.19 to 0 | Structural, frames |
| 80 – 120 | -0.22 to 0 | Heavy components |
These are indicative h11 limits for hot rolled bars; turned and drawn bars hold tighter classes on request. Specify the tolerance you truly need so we can pick the right process and avoid paying for precision you will machine away anyway. Tighter bands also affect straightness and ovality expectations, so tell us the end use and we will recommend the most cost-effective condition.
Common Order Mistakes to Avoid
- Quoting only diameter without length and quantity
- Assuming all ‘S235’ bars are identical across standards
- Forgetting to request the MTC class your client needs
- Mixing units (meters vs feet) on cut lengths
A clear line such as ‘S235JR round bar, EN 10025-2, 40 mm dia x 6000 mm, 5 MT, 3.1 MTC, FOB Tianjin’ prevents all four. We are happy to confirm the equivalent grade if your drawing names a different standard, and to split a trial order so you can verify before committing to volume.
Why Buy S235JR Round Bar from Huaxia-Steel
We hold a wide diameter range in stock, cut to your exact lengths, and supply the EN 10204 3.1 certificate mill buyers require. Our export packing protects the bars through long ocean voyages, and our team can consolidate your round bar order with plates, sections or fasteners in one container to lower freight. Whether you need a single trial lot or a recurring monthly schedule, we return a firm quote with lead time within one business day and keep the heat-number traceability your auditor expects.
Mechanical Property Detail by Diameter
Although S235JR is specified by a single minimum yield of 235 MPa, real delivered values usually run higher, and elongation is verified on the certificate for your exact heat. The table below shows representative ranges you can expect from a qualified mill; always rely on the actual 3.1 certificate for release decisions. Knowing the typical spread helps you plan machining allowances and confirms the bar is not at the very bottom of the specification where consistency may suffer.
| Diameter (mm) | Typical yield (MPa) | Typical tensile (MPa) | Elongation (%) |
|---|---|---|---|
| 10 – 30 | 255 – 290 | 400 – 480 | 28 – 32 |
| 30 – 80 | 245 – 275 | 390 – 470 | 27 – 30 |
| 80 – 160 | 240 – 270 | 380 – 460 | 26 – 29 |
| 160 – 300 | 235 – 265 | 370 – 450 | 26 – 28 |
Chemical Composition You Should See on the MTC
A proper EN 10025-2 certificate for S235JR lists carbon up to about 0.17 to 0.20 percent depending on thickness, manganese around 1.40 percent max, phosphorus and sulfur each at 0.035 percent max, and silicon up to about 0.55 percent. These tight impurity limits are what give the grade its good weldability and predictable behavior. If your downstream use involves bending or cold forming, ask us to confirm the carbon and sulfur are toward the lower end of the band so you avoid cracking at tight radii.
Cutting, Chamfering and End Preparation
Beyond straight length cutting we offer chamfered ends for easy handling and feeding into machines, and deburred cut faces to protect threading tools and operators. For parts that bolt together on site, we can drill or tap ends to your drawing and bundle by assembly so the right pieces arrive together. Small value-added steps like these move work off your shop floor and arrive ready to use, which is often cheaper than doing the same operation in-house at low volume.
Heat Treatment and Condition Options
Most S235JR round bar is supplied hot rolled and as-rolled, which is ideal for general fabrication. Where you need improved straightness, surface finish or dimensional control, choose peeled or turned bar; where tight tolerances and a bright surface are required, bright-drawn bar is available on request. We can also supply normalized condition for applications that benefit from a more uniform grain structure. Tell us the end use and we will recommend the most cost-effective condition rather than the most expensive one.
A Practical Ordering Example
A typical enquiry reads: S235JR round bar, EN 10025-2, 50 mm diameter x 6000 mm, 5 MT, black hot rolled, EN 10204 3.1, cut ends deburred, FOB Tianjin. From that single line we return a firm quote with lead time, confirm stock or rolling schedule, and state the bundle format. Repeating this discipline across diameters and lengths builds a clear, comparable record that makes reordering fast and removes the ambiguity that causes short shipments.
Storage and Transit Protection
During export the bars are strapped into bundles, end-protected where needed, and wrapped or separated to avoid edge damage in the container. For long ocean voyages we add desiccants or VCI paper on request to control condensation, because surface rust on arrival creates avoidable inspection friction even though it does not change properties. Good packing is part of the product, not an afterthought, and it is why our bars arrive presentation-ready at the destination port.
Choosing Diameter and Condition for Your Job
Pick the smallest diameter that meets the load and machining allowance, because oversized bar wastes material and machine time. For shafts and pins choose turned or bright-drawn bar to hold the fit; for frames and brackets black hot rolled is usually enough. If you will machine most of the surface away, paying for a tight tolerance condition is wasted money, so match the condition to the final part rather than to habit. Tell us the end use and we will recommend the most economical route from our stock range.
Frequently Asked Buyer Questions
Can S235JR round bar be hardened?
S235JR is a mild steel with low carbon, so it does not through-harden like 1045 or 4140; it is chosen for weldability and machining, not for wear hardness. If you need a hard surface, consider induction hardening the case or switching to a medium-carbon grade for the critical component while keeping S235JR for the rest of the assembly.
What is the difference between S235JR and S275JR bar?
S275JR has a higher minimum yield of 275 MPa versus 235 MPa, so it carries more load at the same size but costs a little more and is slightly less formable. For most general fabrication S235JR is sufficient; choose S275JR when the design is strength-limited and a thinner or lighter member matters.
Lead Time and Stock Availability
Common diameters from 12 to 120 mm are typically in stock for fast shipment, while very large or tight-tolerance conditions may need a rolling or drawing slot of a few weeks. We confirm availability against your exact list before quoting, and we can hold buffer stock for recurring schedules so your production line never waits. A short forecast from you lets us pre-position the diameters you use most, turning a spot purchase into a reliable supply.
Request a Quote for Carbon Steel
Huaxia-Steel supplies a full range of carbon steel products with mill test certificates, third-party inspection and flexible export terms (FOB, CIF, CFR, DDP). Tell us your grade, size and quantity, and our team will return a competitive quote with lead time within 24 hours. Email [email protected] or use the contact form to start your order.
