S275JR Carbon Steel Round Bar — Factory Direct Supplier | Huaxia-Steel
S275JR carbon steel round bar is a European-standard structural mild steel bar with a minimum yield strength of 275 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. Huaxia-Steel stocks and exports S275JR round bars in a full size range with EN 10204 certificates and flexible cutting.
Product Overview
S275JR belongs to the EN 10025-2 family of non-alloy structural steels. The JR suffix indicates room-temperature impact toughness. Supplied in hot rolled condition, it offers a balance of strength, ductility and machinability that suits brackets, shafts, pins, frames and countless fabricated parts, and it is easy to source in both stock lengths and cut pieces.
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 | >=275 MPa |
| Tensile strength | 410 – 560 MPa |
| Surface | Black, pickled or turned |
Available Options
- Black hot rolled round bar
- Peeled / turned bar
- Bright drawn (on request)
- Cut-to-length pieces
Manufacturing Standards
Produced to EN 10025-2 with EN 10204 3.1 mill certificates. Equivalent grades include ASTM A36 and GB/Q235B for cross-referencing on export orders, so a buyer specifying any of these can be quoted against S275JR with documented equivalence.
Applications
- Machined shafts and pins
- Structural and frame fabrication
- Brackets and connectors
- General engineering components
- Construction reinforcement details
- Mild steel fixtures
Quality Assurance
Bars are checked for diameter, straightness, surface and end condition. Mill certificates confirm chemistry and mechanical properties. Third-party inspection is available for critical orders, and each bundle is tagged with grade, heat number and dimensions for traceability.
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 that resists moisture during long voyages.
Machinability
S275JR machines readily with standard tooling and feeds, giving a good surface finish for shafts, spacers and bushings. For higher-volume turned parts, peeled or bright-drawn bar reduces machining allowance and improves consistency versus black bar.
Weldability and Preheat
The low carbon and controlled CEV make S275JR easy to weld with common processes and usually no preheat below about 20 mm. For thicker or restrained joints, a light preheat of 100 C is sensible. Use matching-strength consumables and control hydrogen to avoid cold cracking.
Tolerance and Straightness
Hot rolled bar is supplied to standard h11/h12-ish diameter tolerance and standard straightness. Where tight fit matters, choose peeled/turned bar with closer tolerance and better straightness, or request straightening and chamfering as a service item.
Equivalent Grades
| Standard | Grade | Note |
|---|---|---|
| EN 10025-2 | S275JR | Base grade |
| ASTM A36 | A36 | USA equivalent |
| GB/T 700 | Q235B | China equivalent |
| JIS G3101 | SS400 | Japan near-equivalent |
These grades are routinely accepted as alternatives in many tenders; confirm any substitution in writing and align the mill certificate to the referenced standard.
Heat Number Traceability
Every S275JR bundle carries a tag with grade, diameter, heat number and dimensions. Keep this tag through fabrication so any quality query traces back to the cast. For structural jobs requiring documented origin, we provide the mill heat report alongside the EN 10204 3.1.
Cutting and Chamfering Services
We cut bars to length with sawn or sheared ends and can chamfer or deburr the cut face for direct fit-up. For machined parts, peeled or bright-drawn bar reduces your allowance. Send the cutting list with tolerances and we return bundled, tagged lengths ready for the floor.
Storage and Protection
Black bar stores well under cover but should be kept dry to avoid surface rust that complicates painting. For long storage or humid routes, request oiled or wrapped bundles. Turned and bright bars need stronger protection because their finished surface is what you pay for.
Typical MOQ and Lead Time
Stock diameters ship in 7-20 days; made-to-order sizes in 30-45 days. MOQ is usually one bundle for stock or one heat for custom. Plan around production lead time, not just transit, and confirm the diameter range you need before we reserve the heat.
Why Source from Huaxia-Steel
We combine mill access with export discipline: consistent grade, full certificates, seaworthy packing and responsive documentation. For repeat buyers we hold stock profiles and pre-arrange inspection, so reorders arrive to the same standard every time.
S275JR vs S355JR: When to Step Up
Use S275JR for general structural and machined parts where 275 MPa yield is enough. Step up to S355JR when the design is weight- or load-critical and the small strength gain justifies the cost. For most brackets and fixtures, S275JR is the economical default.
Common Defects and Inspection
Check for surface seams, out-of-round diameter, bent ends and mixed heats. Measure diameter and straightness on arrival, and verify the heat number against the MTC. For turned bar, check the surface finish and dimensional tolerance before release to production.
Round Bar vs Other Sections
Round bar suits shafts, pins and machined parts; flat, square and angle suit framing and structural ties. If your part is turned, round bar is the natural starting shape and minimizes machining waste versus cutting from plate.
Industries We Serve
- General engineering
- Construction and fabrication
- Machinery manufacturing
- Automotive components
- Agricultural equipment
- Maintenance and repair
S275JR Quality Plans and Inspection
Our quality plan for S275JR covers diameter and straightness tolerance, surface and end condition, and heat-number traceability. On arrival, check the bar against the MTC, verify the heat number on the tag, and sample for dimension and straightness. For turned bar, add a surface-finish check before release to production.
Working With a Direct Supplier
A direct supplier relationship means consistent grade, reliable certificates and faster reordering, because we hold your profile and inspection settings on file. For repeat buyers we can pre-arrange stock and inspection so each shipment matches the last, which is what keeps assembly lines running without surprises.
Sustainability and Compliance
S275JR is a low-alloy structural steel with standard environmental documentation available from the mill. We ensure export packing meets destination rules, including ISPM-15 where wooden materials are used, and can supply compliance statements if your tender requires them.
Summary: Why Choose S275JR
S275JR delivers the right balance of strength, weldability and cost for the majority of structural and machined carbon steel parts. With proper certificates, traceability and packing, it is a low-risk, widely accepted choice that keeps your project simple and your documentation clean.
Ordering S275JR: Tips for a Smooth Purchase
Confirm diameter, length, condition (black, peeled or bright drawn), tolerance and any cutting or chamfering before quoting, and state EN 10025-2 plus the certificate type. Tell us your end use so we can advise on machinability and welding, and confirm lead time for stock diameters versus made-to-order heats.
Our Commitment to Export Buyers
We commit to heat-number traceability, EN 10204 3.1 certificates, seaworthy packing and reliable documentation, and to keeping your profile on file for consistent reorders. For S275JR round bar, that means every bundle is tagged, certified and ready to use, with no guesswork at goods-in.
S275JR Machining Tips
Machine S275JR with standard carbide or HSS tooling at moderate speeds; it turns and mills cleanly and gives a good finish for shafts and spacers. For volume, use peeled or bright-drawn bar to cut machining allowance and improve consistency. Allow for standard machining forces and use coolant to extend tool life on long runs.
S275JR Welding Tips
Weld with common processes and matching-strength consumables; low carbon and controlled CEV mean usually no preheat below about 20 mm. For heavier or restrained joints, a light preheat and hydrogen control prevent cold cracking. Keep the WPS simple and the consumables matched, and the joints will be sound without special measures.
S275JR Summary and Next Step
S275JR round bar is the economical, widely accepted choice for structural and machined carbon steel parts, with full EN 10204 3.1 traceability and flexible cutting. Send your diameter, length and condition, and we will quote stock or made-to-order with inspection and packing. Contact us for a stock check or a first-article sample before your production run.
S275JR Round Bar: Lead Time and MOQ Recap
Stock diameters typically ship in 7-20 days; made-to-order heats in 30-45 days, with a one-bundle minimum for stock or one heat for custom. We cut to length, chamfer and tag every bundle by heat number, and pack for export. Tell us your diameter range and volume and we will confirm the fastest route from mill to your dock.
S275JR Round Bar: Quick Application Recap
In practice, S275JR round bar is the dependable choice for machined shafts, pins, brackets, frames and general engineering parts where 275 MPa yield is enough and weldability matters. With EN 10204 3.1 traceability, flexible cutting and export packing, it keeps fabrication simple and your documentation clean. Send your size and volume and we will confirm stock and lead time without delay.
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.
