Stainless Steel Square Bar for sale

Categories	Stainless Steel Bar
Standards:	ASTM A276, A582, A564; EN 10088-3
Testing:	Dimensions, corner geometry, straightness, PMI and hardness
Size:	5 × 5 mm to 150 × 150 mm typical; larger custom sections by review
Tolerance:	Commercial or tighter cold-drawn tolerance by agreement
Corners:	Natural rolled radius, drawn corners or machined corners by drawing
Length:	3 m, 6 m, 12 ft, 20 ft or cut-to-length
Condition:	Hot rolled, annealed, pickled, cold drawn or bright
Grades:	304, 304L, 316, 316L, 303, 410, 420, 430, 17-4PH

Product Details
Company Profile

Stainless Steel Square Bar

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Shaanxi Shangyou Stainless Steel Co., Ltd. supplies stainless steel square bar for keys, fixtures, machine components, supports, frames and precision-machined blocks. Square bars are available in general-purpose austenitic grades, free-machining grades, martensitic grades and precipitation-hardening materials. Product condition affects the across-flat tolerance, corner profile, surface and machining allowance.

First-Screen Procurement Summary

Purchase Item	Supply Information
Grades	304, 304L, 316, 316L, 303, 410, 420, 430, 17-4PH
Size	5 × 5 mm to 150 × 150 mm typical; larger custom sections by review
Length	3 m, 6 m, 12 ft, 20 ft or cut-to-length
Condition	Hot rolled, annealed, pickled, cold drawn or bright
Corners	Natural rolled radius, drawn corners or machined corners by drawing
Tolerance	Commercial or tighter cold-drawn tolerance by agreement
Standards	ASTM A276, A582, A564; EN 10088-3
Testing	Dimensions, corner geometry, straightness, PMI and hardness
Processing	Saw cutting, milling, drilling, keyway machining and polishing
Documents	MTC 3.1 and traceable inspection records

Product Description and Purchasing Logic

Hot-rolled square bar is suitable for structural fabrication and components requiring substantial machining allowance. Cold-drawn or bright square bar offers closer dimensions, improved straightness and a cleaner surface, making it useful for repetitive machining and visible fabrications. The corner radius must be reviewed because a rolled or drawn square bar does not have perfectly sharp corners. If a part requires sharp 90-degree corners, a machined or ground route may be necessary.

The RFQ should state the across-flat dimension, length, corner requirement, straightness, surface and final use. 303 can improve machining productivity for fastener and fitting components but is not preferred for welding or severe chloride service. 304 and 316L provide better fabrication and corrosion balance. 17-4PH may be selected for higher-strength keys and machine parts, but its exact heat-treatment condition must be specified.

Processing and Machining Guidance

Square bar can be cold-sawn, band-sawn, milled, drilled, keyed and polished. When machining long sections, clamping and material-removal sequence should minimize bow and twist. Austenitic bar work-hardens; sharp carbide tooling, sufficient feed and coolant are important. For martensitic or precipitation-hardening grades, rough machining is commonly completed in the annealed or solution-treated condition before hardening, aging and final grinding.

Material Selection Boundaries

Nominal square size does not define corner sharpness or diagonal tolerance. Buyers should not assume cold-drawn bar is stress-free, and final distortion after heavy machining must be considered. For load-bearing parts, confirm the material condition and mechanical test values rather than selecting only by grade name.

Representative Technical Performance Table

Grade / Designation	Key Chemistry (wt.%)	Density g/cm³	Tensile MPa	Yield MPa	Elong. %	Hardness	Heat Treatment / Condition
304 / S30400 / 1.4301	C≤0.08; Cr 18–20; Ni 8–10.5	7.93	≥515	≥205	≥40	≤201 HB	Solution annealed; not hardenable by heat treatment
316L / S31603 / 1.4404	C≤0.03; Cr 16–18; Ni 10–14; Mo 2–3	8.00	≥485	≥170	≥40	≤217 HB	Solution annealed; rapid cooling after hot work
303 / S30300 / 1.4305	C≤0.15; Cr 17–19; Ni 8–10; S≥0.15	7.83	Heat/size dependent	Heat/size dependent	Per order	Approx. 160 HB annealed	Annealed; cannot be hardened by heat treatment
410 / S41000 / 1.4006	C≤0.15; Cr 11.5–13.5	7.75	≥450	≥275	≥20	≤207 HB annealed	Annealed or hardened and tempered to order
17-4PH H900 / S17400 / 1.4542	C≤0.07; Cr 15–17.5; Ni 3–5; Cu 3–5; Nb+Ta 0.15–0.45	7.75	≥1310	≥1170	≥10	Approx. 40 HRC or higher	Solution treated, then aged at 482°C for H900

Values are representative engineering references for common conditions. The applicable ASTM/EN standard, section size, ordered condition and MTC control acceptance. Grade 303 is frequently hardness-controlled under ASTM A582, so tensile values should not be assumed without the certified heat data.

Available Processing and Inspection

Process / Inspection	Purpose	Ordering Note
Saw cutting / cold sawing	Fixed lengths and production blanks	State length tolerance, squareness and burr requirement
Peeling / turning	Remove hot-worked surface and improve diameter	State final raw size and machining allowance
Centerless grinding	Control diameter, roundness and surface	State ISO tolerance, straightness and Ra separately
Chamfering / facing	Improve loading, assembly and length control	Provide angle, width, radius or finished length
PMI / chemistry verification	Confirm alloy family and heat identity	XRF does not independently confirm L-grade carbon
Hardness / mechanical tests	Verify condition and grade requirements	Test method, sampling and condition must match the standard
UT / third-party inspection	Evaluate internal quality and witness compliance	Define method, acceptance class, coverage and report

Typical Applications

Machine keys and blocks
Fixtures and tooling
Frame and support components
Valve and fitting parts
Architectural details
High-strength equipment parts

RFQ and CTA

Provide the across-flat size, length, grade, condition, corner profile, tolerance, quantity and processing drawing. Shangyou will confirm the practical route and machining allowance.

Request a Quote · Send Your Size List · Upload Drawing or MTO · Confirm Grade and Condition

FAQ

1. How is square bar size specified?

Specify the across-flat dimension, for example 25 × 25 mm, plus length. Add corner radius, diagonal tolerance and straightness when these features affect the final part.

2. Are square-bar corners sharp?

Hot-rolled and cold-drawn square bars have a natural corner radius. Perfectly sharp corners normally require machining or grinding.

3. What is the benefit of cold-drawn square bar?

Cold drawing improves dimensional consistency and surface finish and can raise strength through cold work. It may also introduce residual stress that matters during heavy machining.

4. Can 303 square bar be welded?

303 is not recommended for routine welding because sulfur improves machinability but can promote hot cracking. A different grade is usually selected when welding is required.

5. Can square bar be cut into short blanks?

Yes. Saw-cut blanks can be supplied with agreed length tolerance, burr removal and identification by heat number.

6. Can you machine keyways or holes?

Milling, drilling, tapping and keyway processing can be arranged from drawings. Finished tolerances should be stated separately from raw-stock tolerances.

7. Which grade is best for high-strength square parts?

17-4PH is commonly considered where higher strength is required. The final condition, such as H900 or H1150, must be selected according to strength and toughness needs.

8. How is straightness checked?

Straightness can be checked using a surface plate, straightedge or roll measurement method. The acceptance value and gauge length must be agreed in the order.

9. Can square bar be polished?

Yes. Mechanical polishing or brushing is available, but the process can slightly affect edge definition and final dimensions.

10. What documents are available?

MTC 3.1, dimensional reports, PMI reports, hardness results and third-party inspection can be supplied when included in the order.

Stainless Steel Square Bar

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