304 Stainless Steel Square Bar – Durable & Cost-Effective Alloy for Industrial Applications

The ​304 stainless steel square bar is a widely used austenitic alloy celebrated for its balance of strength, corrosion resistance, and affordability. As a leading ​304 stainless steel square bar supplier, we deliver high-quality material for construction, machinery, automotive, and consumer goods sectors. This ​stainless steel square bar features excellent formability, weldability, and resistance to atmospheric corrosion, making it ideal for both indoor and outdoor applications.

​Technical Specifications & Production Process

​Table 1: Key Mechanical & Physical Properties

​Table 2: Manufacturing Processes & Applications

​In-Depth Technical Analysis

​Tensile Strength & Load-Bearing Capacity

The ​304 stainless steel square bar delivers ​515 MPa minimum tensile strength, ensuring it withstands extreme axial forces in critical applications like:

• ​Construction frameworks: Beams and columns in bridges or buildings.
• ​Automotive components: Engine parts and chassis members.
• ​Heavy machinery: Shafts and bearings under high stress.

ASTM A276 testing confirms consistent performance, while ​40% elongation guarantees flexibility during bending and welding operations.

​Bending Strength & Structural Design

This alloy’s ​excellent bending strength makes it ideal for components subjected to cyclic or static loads:

• ​Marine handrails: Withstand constant wave forces and salt spray.
• ​Food conveyor systems: Flexible yet durable for high-speed operations.
• ​Architectural cladding: Stable under thermal expansion and contraction.

Engineers leverage its ​molybdenum content (2–3%) to resist chloride-induced stress corrosion cracking in harsh environments.

​Identification & Quality Assurance

Each ​stainless steel square bar is marked with:

• ​Permanent heat number: Traceable to batch-specific mill test reports.
• ​Grade designation: “304” or “304L” (low-carbon variant for welded joints).
• ​Manufacturer’s logo: Ensuring authenticity and compliance.

Certifications include:

• ​ASTM A276/A479: Verified chemical composition and mechanical properties.
• ​EN 10204 3.1: Third-party inspection for European markets.
• ​NACE MR0175: Approved for sour gas services.

​Weight Calculation Method

To determine the weight of a ​stainless steel square bar:

1. Measure the ​edge width in millimeters.
2. Square the width value.
3. Multiply by ​0.0079 (a conversion factor derived from density).

Example:
A ​50mm × 50mm bar weighs:
$50\times 50\times 0.0079=19.75\text{kg/m}$.

Our team provides ​free weight calculation tools and customized quotes for bulk orders.

​Why Does Stainless Steel Corrode? Causes & Solutions

Despite its corrosion resistance, ​304 stainless steel may degrade under specific conditions:

​1. Chloride Attack

• ​Cause: Prolonged exposure to saltwater (>60°C) disrupts the chromium oxide layer.
• ​Prevention: Use ​304L for welded structures and apply periodic passivation (ASTM A967).

​2. Mechanical Damage

• ​Cause: Scratches or grinding remove the passive layer.
• ​Prevention: Avoid abrasive cleaners and inspect surfaces regularly.

​3. Galvanic Corrosion

• ​Cause: Contact with dissimilar metals (e.g., carbon steel) in electrolytes.
• ​Prevention: Use isolating barriers or choose non-conductive coatings.

​4. High-Temperature Oxidation

• ​Cause: Extended exposure to temperatures above 500°C reduces chromium content.
• ​Prevention: Opt for ​310 or 304 alloys for elevated-temperature applications.

​Industry Applications

• ​Marine: Shipbuilding, desalination plants, and offshore platforms.
• ​Food & Beverage: Hygienic equipment, conveyor systems, and storage tanks.
• ​Construction: Stainless steel handrails, roofing sheets, and cladding.
• ​Medical: Surgical instruments, laboratory equipment, and implants.

​Why Choose Our ​304 Stainless Steel Square Bar**?**

✅ ​Premium Material Quality

• ​Molybdenum content: 2.1–2.5% for superior pitting resistance.
• ​Traceability: Every batch comes with a ​mill test certificate and chemical analysis.

✅ ​Precision Manufacturing

• ​Cold-drawn bars: Tight tolerances (±0.1mm) for CNC machining.
• ​Custom finishes: Available in matte, brushed, or reflective polish.

✅ ​Global Compliance

• Meets ​ISO 6931, ​ASTM A276, and ​ASME SA479 standards.
• ​REACH/RoHS-compliant for international markets.

✅ ​Logistics & Support

• ​24/7 customer service: Technical guidance and urgent order processing.
• ​Global distribution: DDP shipping to over 50 countries.

✅ ​Sustainability

• ​Recyclable material: 100% reusable in new products.
• ​Eco-friendly packaging: Biodegradable materials and minimal waste.