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Grade 304 · Austenitic stainless steel
Stainless Steel 304 Round Bar Manufacturer, Exporter and Supplier
SS 304 round bar is an austenitic chromium-nickel stainless bar grade identified as UNS S30400, DIN 1.4301, and SUS 304. Applications include machined, fabricated, food-processing, construction, automotive, marine, and pharmaceutical-equipment components where the buyer's approved specification calls for Grade 304.
Specify the governing standard, diameter, length, condition, finish, tolerance, testing, documentation, and destination. Use the values below for initial comparison and confirm acceptance limits against the purchase specification.
Product information by Piyush Steel India
At a glance
SS 304 quick facts
- Grade
- Stainless Steel 304
- UNS designation
- S30400
- DIN designation
- 1.4301
- JIS designation
- SUS 304
- Diameter range
- 3–500 mm
- Length range
- 3–6 metres
Confirm size availability for the required standard and supply condition.
Buyer selection guide
How to select Stainless Steel 304 Round Bar
Start with the drawing or purchase specification, not the grade name alone. Grade 304 identifies the material family; the standard, product form, dimensions, condition, finish, tolerance, and verification requirements define what must be supplied.
1. Confirm material identityState Grade 304 together with UNS S30400, DIN 1.4301, SUS 304, or the designation required by the governing document.
2. Name the governing standardThe specifications below reference ASTM A276, ASTM A479, EN 10088-3, and JIS G4303. Identify the required standard and edition.
3. Define the bar requirementProvide diameter, length, quantity, tolerance, condition, surface finish, and any machining allowance.
4. State verification needsList required testing, inspection, traceability, marking, documentation, destination, and requested delivery timing.
Applications
Applications listed for Stainless Steel 304 Round Bar
The following applications may specify SS 304 round bar. Check suitability against the design and service conditions.
Automotive
Engine components, fasteners, and suspension components.
Food processing
Conveyors, mixers, and storage equipment.
Construction
Structural components, frames, and support rods.
Marine equipment
Fittings and valves exposed to marine environments.
Pharmaceutical equipment
Confirm material suitability and any regulated-use requirements for the equipment.
Specifications
SS 304 dimensions, standards and bar forms
| Diameter | Length | Standards listed |
|---|---|---|
| 3–500 mm | 3–6 metres | ASTM A276, ASTM A479, EN 10088-3, JIS G4303 |
| Custom sizes stated | Custom lengths stated | Custom specifications stated |
Confirm the condition, tolerance, finish and diameter during quotation.
Bar forms
Round barCylindrical bar listed for machining, fabrication, and precision components.
Square barListed for welding, structural applications, and manufacturing.
Hollow barHollow cylindrical bar form.
Hex barSix-sided bar listed for structural, decorative, and component use.
Bright barPolished-finish bar listed where a smooth surface is required.
Forged barForged bar listed for heavy-duty applications.
Chemical composition
Chemical composition of SS 304
Composition by mass; confirm limits against the specified standard.
| Element | Symbol | Reference value (%) | Qualifier |
|---|---|---|---|
| Carbon | C | 0.08 | Maximum |
| Chromium | Cr | 18.00–20.00 | Range |
| Nickel | Ni | 8.00–10.50 | Range |
| Manganese | Mn | 2.00 | Maximum |
| Silicon | Si | 1.00 | Maximum |
| Phosphorus | P | 0.045 | Maximum |
| Sulfur | S | 0.030 | Maximum |
Composition limits depend on the applicable standard and edition. Confirm the specified chemistry before ordering.
Mechanical properties
Mechanical properties stated for SS 304
Reference properties; confirm the required supply condition and standard.
| Property | Reference value | Qualifier |
|---|---|---|
| Tensile strength | 515 MPa | Minimum |
| Yield strength | 205 MPa | Minimum |
| Elongation | 30% | Minimum |
| Reduction of area | 40% | Minimum |
| Hardness | 237 HB | Maximum |
| Modulus of elasticity | 193 GPa | Confirm acceptance limit |
Mechanical-property acceptance limits depend on the standard, product condition, size and test method. Confirm these requirements in the purchase specification.
Equivalent grades
Standards and designations listed for SS 304
| Standard or system | Designation |
|---|---|
| ASTM A276 / ASTM A479 | UNS S30400 |
| EN 10088-3 | DIN 1.4301 |
| JIS G4303 | SUS 304 |
Interchangeability notice: a designation cross-reference does not establish direct interchangeability. Confirm composition, properties, dimensions, testing, condition, and project requirements under the governing standard.
Product identification
State the required heat number, grade, size and manufacturer marking in the purchase specification, together with traceability documents.
Product questions
SS 304 round bar FAQ
Which designations are listed for Stainless Steel 304?
Grade references include UNS S30400, DIN 1.4301, and SUS 304. Confirm the governing standard instead of relying on a designation alone.
What sizes can I enquire about?
The page states 3–500 mm diameter and 3–6 metre lengths, with custom dimensions also stated. Actual supply must be confirmed by standard, condition, and quantity.
Which standards are listed for SS 304 round bar?
The specifications below reference ASTM A276, ASTM A479, EN 10088-3, and JIS G4303. The applicable edition and purchase requirements need confirmation.
What should be included in a quotation request?
Provide the standard and grade, diameter, length, quantity, condition, finish, tolerance, testing, documentation, destination, and requested timing.
Technical considerations
What to verify before specifying SS 304 round bar
Standard controls acceptance
The designation “304” does not define every chemical, mechanical, dimensional, testing, or documentation requirement. The purchase order should name the governing standard and edition.
Condition affects reported properties
Confirm the product condition, diameter, specimen direction, test method and temperature before using mechanical-property values for design calculations.
Cross-references are not approvals
UNS S30400, DIN 1.4301, and SUS 304 help identify the grade across designation systems. They do not by themselves prove full interchangeability under a project specification.
Application context must be defined
State the service environment, fabrication route, loads, cleaning exposure, surface requirement, inspection plan, and documentation needs so the material requirement can be reviewed properly.