304 Stainless Steel Round Bar

304 stainless steel round bar (UNS S30400) is a widely used chromium-nickel austenitic alloy specified for machined pins, shafts, fittings and general industrial parts. It offers a combination of corrosion resistance, fabricability and availability. Mozaic Precision Metals supplies and processes round bar to customer-defined diameter and finish requirements.

Download 304 Stainless Steel Round Bar — Mozaic technical reference (PDF)

304 Stainless Steel Round Bar — Technical Specifications

Reference data; confirm the exact order specification and material condition
Property or designation	Reference information
Alloy / UNS	304 / S30400
Related low-carbon grade	304L / S30403 (a separate designation)
European alloy designation	EN 1.4301 (304); EN 1.4307 (304L)
Common bar specification	ASTM A276 or A479, as applicable to order
Chromium (Cr)	Typically 17.5–19.5 wt% in referenced grade sheet
Nickel (Ni)	Typically 8.0–10.5 wt% in referenced grade sheet
Density	Approximately 7.90 g/cm³ (annealed)
Heat-treating response	Not conventionally hardenable by quench-and-temper treatment
Service limitation	Localized corrosion can occur in chloride-bearing environments

Technical values shown are general reference information, not a mill test report. Chemical limits and mechanical properties are governed by the applicable material specification, heat/lot and supply condition.

Applications and Grade Comparison

304 is widely used in fittings, food-handling machinery, architectural parts, and turned components. For higher-volume machining, 303 stainless may be evaluated when its reduced corrosion resistance is acceptable. 316 stainless adds molybdenum and may perform better in some chloride conditions. ASTM and mill paperwork should determine whether 304 or 304L is required.

Precision Centerless Grinding and Bar Preparation

Precision grinding can produce a controlled finished bar OD and smooth surface for shafting and bar-fed machining. Provide grade, bar condition, full-length straightness requirement, target OD tolerance, material documentation, and quantity. See Mozaic’s centerless grinding services.

Common Questions

Are 304 and 304L identical?

No. 304L is a separately designated low-carbon grade, and the accepted chemistry and mechanical requirements depend on the order specification.

Can 304 be hardened by heat treatment?

No, standard austenitic 304 is not hardened by conventional heat treatment; cold working increases strength.

Request a Quote

For order-specific sourcing and grinding availability, request a quote, email sales@mozaicprecision.com, or call 847-637-8379.

Reference source: technical grade information. This page is not a substitute for the relevant purchase specification or mill certification.

Quality 304 Stainless Steel Round Bar Stock

304 stainless steel round bar is one of the most widely used austenitic stainless grades, prized for its corrosion resistance, durability, and excellent formability. Its ability to be deep drawn makes it the preferred choice for cookware, sinks, kitchen equipment, and a wide range of structural and industrial applications.

Chemical Composition of 304 Stainless Steel

The carefully balanced alloying elements in 304 stainless bar stock ensure superior performance:

Carbon (C): 0.00 – 0.07%

Manganese (Mn): 0.00 – 2.00%

Silicon (Si): 0.00 – 1.00%

Phosphorus (P): 0.00 – 0.05%

Sulfur (S): 0.00 – 0.03%

Chromium (Cr): 17.50 – 19.50%

Nickel (Ni): 8.00 – 10.50%

Nitrogen (N): 0.00 – 0.11%

Iron (Fe): Balance

Partner with Mozaic Precision Metals

At Mozaic Precision Metals, we supply precision-ground 304 stainless steel round bar in multiple sizes and finishes. Our value-added services—including grinding, polishing, cutting, and chamfering—ensure each bar meets strict dimensional and quality requirements.

For industries that demand a versatile, cost-effective, and corrosion-resistant stainless alloy, 304 stainless steel from Mozaic remains the trusted standard.