Stainless Steel Bar
Premium austenitic stainless steel bar for precision machining and structural applications
High-quality 304/316 stainless steel bar combines excellent machinability with superior corrosion resistance for manufacturing fasteners, shafts, structural components, and precision machined parts. Available in multiple profiles and finishes.
Quick Specifications
- Material Designation
- ASTM A 276 / UNS S30400 (304) or S31600 (316)
- Werkstoff Number
- 1.4301 (304) or 1.4401 (316)
- Form
- Bar (Round, Hexagonal, Square, Flat)
- Tensile Strength
- 515 - 860 MPa (depending on hardness)
- Yield Strength
- 205 - 620 MPa (depending on hardness)
- Elongation
- 15 - 40% (depending on hardness)
Standards & Certifications
Product Description
Stainless steel bar provides precision engineers with material combining the corrosion resistance of stainless steel with the machinability and structural properties required for diverse industrial components. The austenitic chromium-nickel composition delivers exceptional resistance to atmospheric corrosion, seawater exposure, and mildly aggressive chemical environments. The bar form enables efficient machining of complex geometries while maintaining superior corrosion protection and long-term reliability.
Our stainless steel bars are produced from virgin ingots through controlled hot-working and cold-rolling to optimize grain structure, mechanical properties, and dimensional accuracy. Available in round, hexagonal, square, and flat profiles, the bars accommodate diverse machining requirements and component designs. Each bar undergoes rigorous quality control testing to verify mechanical properties, dimensional accuracy, and surface quality meeting stringent specifications.
Stainless steel bar exhibits excellent machinability characteristics when processed with appropriate cutting tools, feeds, speeds, and cooling fluids. The material's response to heat treatment and work-hardening enables engineers to optimize component design for strength, durability, and manufacturing efficiency. Whether for production of high-volume fasteners or precision-machined components, stainless steel bar delivers consistent quality and superior performance.
With proven service history across industries including aerospace, pharmaceutical, food processing, and general industrial manufacturing, stainless steel bar stands as the preferred material choice for engineers requiring the combination of superior machinability, exceptional corrosion resistance, and cost-effectiveness in component fabrication.
Specifications
| Material Designation | ASTM A 276 / UNS S30400 (304) or S31600 (316) |
| Werkstoff Number | 1.4301 (304) or 1.4401 (316) |
| Form | Bar (Round, Hexagonal, Square, Flat) |
| Tensile Strength | 515 - 860 MPa (depending on hardness) |
| Yield Strength | 205 - 620 MPa (depending on hardness) |
| Elongation | 15 - 40% (depending on hardness) |
| Density | 8.0 g/cm³ |
| Melting Point | 1399 - 1418°C |
| Thermal Conductivity | 16.3 W/m·K at 100°C |
| Modulus of Elasticity | 193 GPa |
| Machinability Rating | 35 - 45% (relative to 300M steel at 100%) |
| Maximum Service Temperature | 425°C (continuous) |
Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 18.0 - 20.0 |
| Nickel (Ni) | 8.0 - 12.0 |
| Molybdenum (Mo) | ≤ 0.75 (316 grade) |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Balance |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Annealed) | 515 - 620 MPa |
| Tensile Strength (1/2 Hard) | 620 - 860 MPa |
| Yield Strength (Annealed) | 205 MPa minimum |
| Elongation (Annealed) | 40% minimum |
| Elongation (1/2 Hard) | 15% minimum |
| Hardness (Annealed) | 217 HV maximum |
| Hardness (1/2 Hard) | 340 - 380 HV |
| Impact Strength (Charpy V) | ≥ 80 J at room temperature |
Key Features & Advantages
Applications
Fastener Manufacturing
Production of bolts, screws, studs, and nuts where superior corrosion resistance and consistent mechanical properties ensure reliable fastening in corrosive environments and critical applications.
Machinery and Equipment Shafts
Manufacturing of rotating shafts, spindles, and drive components where excellent machinability and corrosion resistance enable precision fabrication of components meeting exacting dimensional and durability requirements.
Precision Instrumentation Components
Fabrication of measurement instrument components, valve bodies, and precision fittings where dimensional accuracy, corrosion resistance, and non-magnetic properties enable reliable instrument operation.
Pharmaceutical and Food Equipment
Manufacturing of process equipment components, cleanroom hardware, and hygienic system elements where material purity, sterilization compatibility, and superior corrosion resistance are non-negotiable requirements.
Aerospace and Defense Components
Production of aircraft fasteners, structural elements, and high-reliability components where superior material consistency, corrosion resistance, and mechanical properties enable safe long-term service.
Marine and Offshore Hardware
Manufacturing of mooring fittings, deck hardware, and structural components where exceptional seawater corrosion resistance enables extended service life in harsh marine environments.
Frequently Asked Questions
What hardness conditions are available for stainless steel bar, and which is best for machining?
What cutting speeds and feeds are recommended for machining stainless steel bar?
Can stainless steel bar be cold-worked or forged?
What post-machining finish treatments are recommended for stainless steel bar components?
Is 304 or 316 stainless steel bar better for fasteners and hardware?
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