Flat Bars
Flat bar for supports, brackets and fabrication — hot-rolled in carbon, alloy, stainless and duplex grades.
Technical specification
| Parameter | Specification |
|---|---|
| Product | Hot-rolled & bright (cold-finished) bars — round, square, hex, flat |
| Dimensional standard | EN 10060 (round) · 10059 (square) · 10058 (flat) · 10061 (hex) |
| Finish | Hot-rolled · cold-drawn · ground · peeled |
| Tolerance | h9 / h11 (bright bar) · product-standard (hot-rolled) |
| Size range | 5 – 250 mm |
| Material specifications | ASTM A276, A479, A582, A29 · EN 10088-3 / 10083 |
| Condition | Annealed · solution-annealed · quenched & tempered |
| Documentation | EN 10204 3.1 / 3.2, PMI |
How it is made
Bars are hot-rolled or forged from bloom/billet, then optionally cold-finished — cold-drawn, centreless-ground or turned/peeled — for close tolerance (h9/h11) and a bright surface. Stainless is solution annealed and pickled; free-machining 303 has controlled sulphur for machinability; alloy steels are quenched & tempered to the required condition. Because carbon and alloy bar mechanicals depend on the heat-treatment condition and section size, those values are given as typical for the condition and confirmed on the MTC; stainless and duplex bar carry the ASTM A276/A479 specification minima.
Grades & materials
All grades supplied for this product family, with representative chemistry. Exact grade, class and condition are confirmed per order.
| Material family | Grades | UNS | Standard | Service |
|---|---|---|---|---|
| Austenitic stainless | A276/A479 304, 304L, 316, 316L, 321, 310, 347 | — | ASTM A276 / A479 | Corrosion |
| Free-machining SS | A582 303, 303Se | S30300 | ASTM A582 | Machined parts |
| Martensitic SS | A276 410, 420, 431 | — | ASTM A276 | Wear / strength |
| Duplex / super duplex | A276/A479 S31803 (2205), S32750 (2507) | — | ASTM A276 / A479 | Chloride / sour |
| Alloy steel | 4140, 4340, EN19, EN24 | — | ASTM A29 / EN 10083 | High strength |
| Carbon steel | EN8, EN9, 1045, EN1A (bright) | — | ASTM A29 / EN | General engineering |
| Nickel alloys | B446/B637 (625, 718) | — | ASTM | Severe corrosion |
Chemical composition (representative)
| Grade | C | Mn | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|
| A276 304 | 0.08 max | 2.00 max | 18.0–20.0 | 8.0–10.5 | — | — |
| A276 316 | 0.08 max | 2.00 max | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | — |
| A582 303 | 0.15 max | 2.00 max | 17.0–19.0 | 8.0–10.0 | — | S 0.15 min |
| A276 410 | 0.08–0.15 | 1.00 max | 11.5–13.5 | — | — | — |
| A276 S31803 (2205) | 0.030 max | 2.00 max | 21.0–23.0 | 4.5–6.5 | 2.5–3.5 | N 0.08–0.20 |
| 4140 (alloy) | 0.38–0.43 | 0.75–1.00 | 0.80–1.10 | — | 0.15–0.25 | — |
Standards & specifications
Dimensional & product
- EN 10060/10059/10058/10061 round/square/flat/hex
- ASTM A276/A479 stainless bars
- ASTM A582 free-machining SS
- ASTM A29 / EN 10083 carbon & alloy
Finish & tolerance
- Hot-rolled or bright (cold-drawn/ground/peeled)
- Tolerance h9/h11 for bright bar
- Straightness and surface per order
- Condition (annealed / QT) per grade
Mechanical properties (representative grades)
Representative grades — full MTC values on request. Values are ASTM/ASME specification minima or ranges at room temperature.
| Grade | Condition | Tensile (MPa) | Yield min (MPa) | Elong min (%) | Hardness |
|---|---|---|---|---|---|
| 304 / 304L | Annealed | 515 / 485 | 205 / 170 | 40 | ≤ 201 HBW |
| 316 / 316L | Annealed | 515 / 485 | 205 / 170 | 40 | ≤ 217 HBW |
| 321 | Annealed | 515 | 205 | 40 | ≤ 217 HBW |
| 310 | Annealed | 515 | 205 | 40 | ≤ 217 HBW |
| 347 | Annealed | 515 | 205 | 40 | ≤ 201 HBW |
| 303 (free-machining) | Annealed | 515 | 205 | 35 | ≤ 262 HBW |
| 410 | Annealed | 450 | 205 | 20 | ≤ 217 HBW |
| 410 | Q & T | 620 | 415 | 15 | — |
| 431 | Q & T | 795 | 620 | 15 | — |
| S31803 (2205) | Solution annealed | 620 | 450 | 25 | ≤ 293 HBW |
| S32750 (2507) | Solution annealed | 795 | 550 | 15 | ≤ 310 HBW |
| 1045 carbon | Hot-rolled (typical) | 570–700 | 310 | 16 | 170–210 HBW |
| 4140 alloy | Q & T (typical) | 850–1000 | 650 | 12 | 28–34 HRC |
| 4340 alloy | Q & T (typical) | 930–1080 | 740 | 10 | 30–36 HRC |
Testing, inspection & documentation
| Test / document | Detail |
|---|---|
| Chemical / PMI | Composition to the spec; PMI on stainless/alloy |
| Tensile | Tensile, yield and elongation per grade/condition |
| Hardness | Brinell/Rockwell per grade and condition |
| Corrosion | IGC per ASTM A262 (austenitic) where specified |
| Ultrasonic | For larger sections where required |
| Certification | EN 10204 3.1 as standard; 3.2 with third-party endorsement |
Applications & industries served
Available forms, sizes & range
Provide with your enquiry
- Section and size (dia / across-flats / width×thk).
- Material grade and condition.
- Finish (hot-rolled / bright) and tolerance.
And the commercial detail
- Length and cutting tolerance.
- Standard and required tests.
- Quantity and any drawing or BOQ.
Frequently asked questions
What are flat bars used for?
Supports, brackets, base frames, ladder rungs and general fabrication where a flat rectangular section is needed.
What sizes and grades?
A range of width×thickness combinations in stainless, duplex, alloy and carbon, cut to length.
Hot-rolled or bright?
Flat bar is usually hot-rolled; bright (cold-finished) flats are available where tolerance and finish matter.
Request a quote
Send your requirement to Sagiant Piping Industries and our team responds with grade, material selection, availability and pricing for flat bars. Attach a BOQ, line list or drawing for a faster, more accurate quotation.
- Fast RFQ response with grade & material-selection support
- EN 10204 3.1 / 3.2 certification, PMI & third-party inspection
- BOQ & line-list project supply — India & export
Mechanical & chemical values shown are ASTM/ASME specification figures; certified heat-specific values appear on the MTC. Availability is confirmed with the quotation.
