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304 and 304L (UNS S30400 / S30403, EN 1.4301 / 1.4307) are classic 18-8 chromium-nickel austenitic stainless steel bars, widely used for machining, fastener and mechanical component manufacturing. 304 is standard carbon grade; 304L is low-carbon version. Low carbon limits chromium carbide precipitation after welding, preventing intergranular corrosion, perfect for welded machined parts. This stainless steel bar offers reliable general corrosion resistance in atmospheric, freshwater and mild chemical environments. It balances good machinability, ductility and weldability, non-magnetic in annealed condition.
We supply round bar, square bar, hex bar and flat bar. Available finishes: hot rolled black, bright drawn, peeled, centerless ground, polished. Diameter & thickness can be customized, cut to fixed length. Products comply with ASTM A276, ASTM A479, GB, EN, JIS standards. Mill Test Certificate (MTC) is provided for each batch. Large stock ready, custom cutting service for fast delivery.
Typical chemical composition (wt%)
Performance data of various grades of metal (for reference only) :
Core Performance (Comparison of 304/304L)
Corrosion Resistance: General austenitic, resistant to atmospheric/weak acid/weak alkali; 304L has stronger resistance to intergranular corrosion (no heat treatment required after welding)
Weldability: 304L is low carbon, less prone to sensitization and cracking in the weld heat-affected zone, suitable for chemical/pressure vessels/pipelines
Formability: Elongation ≥40%, easy to bend/stamp/roll, suitable for deep processing
Hygiene: Complies with FDA 21 CFR 177, EU 1935/2004, suitable for food/pharmaceutical applications
Temperature: -196℃~800℃, resistant to low temperatures/heat
Core Applications
General Machinery and Precision Manufacturing: Fasteners (bolts, nuts, lead screws, pins), shafts, gears, bearing housings, guide rails/sliders for automated equipment; automotive parts, construction machinery accessories, hydraulic valve blocks, mold inserts
Chemical and Pressure Vessels: Storage tanks, heat exchangers, pipe flanges, pump and valve bodies, reactor accessories (304L preferred), structural components resistant to weak acids/weak alkalis/neutral salt environments
Food, Pharmaceutical, and Sanitary Grade: Food processing equipment, pharmaceutical machinery, dairy/beverage production lines, tableware, kitchenware, sanitary ware, applications requiring cleanliness, rust-free properties, and easy cleaning
Architectural Decoration and Hardware: Curtain wall framing, door and window hardware, handrails, railings, decorative columns, bathroom hardware, outdoor structures, elevator accessories, decorative profiles
Marine and Marine Engineering: Marine fasteners, deck accessories, seawater pipeline fittings (304L preferred)
Round bars: Hot-rolled black bars φ4–500mm; Cold-drawn / bright bars φ2–100mm; Length 2–6m (customizable)
Square bars / Hexagonal bars: Square bars 5×5–100×100mm;
Hexagonal bars 6–57mm (opposite sides)
Surface: Black skin, peeled skin, cold-drawn bright, grinding, polishing (No.4/HL/8K, less)
Payment Methods
Flexible payment terms available: T/T and L/C. For new clients, 30% advance payment for production, balance against copy of B/L. L/C is acceptable for large & regular orders to secure both parties.
Warehousing Management
Before each batch of steel leaves the factory, a complete process inspection is strictly carried out. From chemical composition, mechanical properties to dimensional tolerance and surface quality, each item is carefully checked to ensure compliance with national standards and export regulations. At the same time, the quantity, packaging and rust prevention treatment are also verified. An original factory warranty certificate is attached, guaranteeing the quality. Before shipment, inspection photos are provided. Any non-compliant items will not be released, and the quality is fully controllable throughout the process. This ensures your overseas purchasing is safe and worry-free.
All items are visually inspected before delivery. No cracks, deformation, rust, scratches or cutting marks are allowed; edges must be smooth. Only visually sound products will be shipped.
Thickness, width, length, wall thickness, outer diameter have been measured. Straightness, curvature, torsion, diagonal tolerance all meet the corresponding tolerance requirements.
Quality inspection includes: mechanical property tests (yield strength, tensile strength), elongation rate, impact energy, hardness testing, chemical composition testing, process performance testing, etc.
Inspection according to packaging requirements: secure binding, moisture-proof film, rust-proof paper, export fumigation/fumigation-free wooden crates, shipping marks, gross weight, net weight, etc.
We will provide full reception services to support the customers' on-site inspection of the goods.
Warehousing Management
A ten-thousand-ton standardized warehouse with grid-based zoning and system positioning enables rapid material retrieval and reduces the time spent searching for materials.
Inbound inspection: Verify the physical items against the inbound form, inspect the appearance, dimensions, and labels. Once confirmed to be correct, the materials are entered into the ERP system and processed for storage.
Logistics and Global Delivery: Self-operated fleet + contracted logistics partners; expedited service available for urgent orders.
International Shipping: Supports FOB, CIF, DDP, and other trade terms, covering 100+ countries and regions.
Process: Booking → Trucking → Customs Declaration → Loading onto Ship/Aircraft → Bill of Lading Issuance → Document Delivery → Destination Port Customs Clearance (Optional) → Last-Mile Delivery.
Provides door-to-door one-stop logistics with full tracking to ensure safe and timely arrival of goods.
After-Sales Service and Traceability: Delivery receipts, logistics information, and quality inspection documents are sent to customers within 24 hours of shipment.
Established a full product lifecycle traceability system, allowing tracking of production, quality inspection, warehousing, and transportation records.
Follow-up inspection within 72 hours of arrival; rapid response and handling of quality issues; assistance in resolving customs clearance issues for foreign trade orders.
Packaging Method
Fumigation-free plywood boxes
Steel strapping/bottom pallet
Vacuum/VCI Rust-Proof Paper
Steel plate frame reinforcement
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