Reviewed technical and procurement guidance · 10 August 2026

304 Stainless Steel Bar

Procurement guide for 304 stainless round, square, hex and flat bar, covering condition, finish, tolerance, straightness, machining, inspection and traceability.

03Grade-product

Specifications and dimensions

State round, square, hexagonal or flat bar; diameter or width × thickness; length and applicable size tolerance.
State hot-finished, cold-finished, peeled, turned, ground or centerless-ground presentation and straightness class.
Define surface roughness, decarburization/scale condition, chamfered ends, ultrasonic-test class and bundle mass where required.

Standards and supply condition

ASTM A276/A276M for stainless steel bars and shapes
ASTM A484/A484M general requirements and ordered dimensional tolerance

Manufacturing and processing

Billet is hot rolled or forged, solution annealed or heat treated as required, straightened and descaled before final finishing.
Cold drawing, peeling, turning and grinding change tolerance, surface, residual stress and mechanical response; order the exact route.

Typical applications

Machined shafts, fasteners, fittings and valve components
Food, chemical and general equipment components
Architectural, structural and marine hardware after environment review

Quality and acceptance controls

Verify heat identity, grade chemistry, heat-treatment condition and mechanical results against the material certificate.
Measure size, ovality, straightness, length and surface condition using the ordered tolerance table.
Inspect laps, seams, cracks, grinding damage and end defects; perform ultrasonic or surface NDE when specified.
Confirm marking, heat-to-bundle traceability, rust-free packing and separation from carbon-steel contamination.

Include in your RFQ

Exact grade or alloy designation and governing product-standard edition
Product form, manufacturing route and ordered delivery condition or temper
Nominal dimensions, tolerances, length/coil geometry and quantity
Surface finish, edge/end condition, straightness/flatness and permitted defects
Fabrication, forming, machining, welding and heat-treatment requirements
Mechanical, corrosion, coating or application-specific acceptance tests
Inspection document, heat/lot traceability, marking and third-party inspection
Packing, preservation, destination, Incoterms and required delivery date

Selection limits

304 designation does not define bar/strip/angle dimensions, condition, finish, tolerance or acceptance; the product standard and order do.
304 is a general corrosion-resistance starting point; chlorides, temperature, crevices and fabrication contamination require review.

10 August 2026

Sources and technical review

ASTM A276/A276M - Stainless Steel Bars and Shapes

ASTM International · A276/A276M-25

ASTM A484/A484M General Requirements for Stainless Steel Bars, Billets and Forgings

ASTM International · Current ordered edition controls

Independent grade guide

304

Review chemistry, properties, corrosion behavior, and material-selection context for this grade.

Independent grade guide →

RFQ support

304 Stainless Steel Bar

Procurement guide for 304 stainless round, square, hex and flat bar, covering condition, finish, tolerance, straightness, machining, inspection and traceability.

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