Stainless Steel Round Tube
Classification :
Product Description
Produced by cold drawing or cold rolling from stainless steel coil or billet, followed by annealing and pickling to ensure excellent corrosion resistance and uniform mechanical properties. Available shapes: round, square, rectangular. Grades: 201, 304, 304L, 316L, 321, 409, 430. Outer diameter (round): 6mm – 1016mm. Wall thickness: 0.5mm – 20mm. Square/rectangular sizes: 10×10 – 400×400mm; custom profiles available. Surface finishes: annealed & pickled (No.1), bright annealed (2B), polished (No.4, 180–600 grit), mirror (BA). Length: 3m – 12m or custom. End finish: plain, beveled, threaded, or grooved. Manufacturing process: seamless (cold drawn) or welded (TIG, plasma, ERW) with optional post-weld annealing. Strict tolerance on OD, wall thickness, and straightness. Meets ASTM A312, A269, JIS G3459, EN 10217-7, or GB/T 14976 standards.
Parameter
| Stainless steel | Round Tube | Square Tube | Rectanglar Tube |
| Wall Thickness | 0.1mm-4mm | 1mm-2.5mm | 0.5mm-2.5mm |
| Outer Diameter | 6mm-630mm | 4*4mm-50*50mm | 5.9*4.4mm-60*44mm |
| Technology | Cold Rolled; Hot Rolled. | ||
| Standard | ASTM, AISI, SUS, JIS, EN, DIN, BS, GB, etc. | ||
| Grade | 200 series：201, 202, 202cu, 204 | ||
| 300 series：301, 302, 303, 303Se, 304, 304L, 304N, 309, 309s, 310, 310S, 316, 316L, 316Ti, 316N, 317L, 321, 347 | |||
| 400series：403, 405, 409, 409L, 410, 410S, 420, 430, 431, 439, 440, 441, 444 | |||
| 600 series：610、630、631、632 | |||
| Duplex Steel: 904L,2205,2507,2101,2520,2304 | |||
| Surface | 2B, 2D, BA, NO.1, NO.4, NO.8, 8K, mirror, checkered, embossed, hair line, sand blast, Brush, etching, etc | ||
| Application | Widely used in petroleum, foodstuff, chemical industry, construction, electric power, nuclear, energy, machinery, biotechnology, paper making, shipbuilding, boiler fields. | ||
Application description:
Widely used in automotive shafts, fasteners (bolts, screws), machine parts, pumps and valves, food processing equipment, medical instruments, architectural hardware, handrails, and marine components. The corrosion resistance and high strength make it suitable for precision machining, turning, and forging in harsh or sanitary environments.
Production description
Stainless steel billet is heated and hot rolled to approximate shape and size. For larger diameters, the bar is used as-rolled. For precision sizes, the hot rolled bar is further cold drawn through a die (with annealing between passes) to achieve tight tolerances and bright surface. The bar is then straightened, cut to length, and optionally polished or solution annealed. Finished bars are inspected for dimensions, surface quality, and mechanical properties.
Shipping Packaging
For export, stainless steel bars are bundled with interleaved paper or plastic separators, wrapped in VCI paper and moisture-proof polyethylene, packed in wooden crates or on ISPM-15 pallets, secured with steel straps, and fitted with edge protectors. Labels include grade, shape, dimensions, length, and heat number for safe sea freight.
Why Choose Us?
1.Factory Strength:Direct manufacturer with integrated hot rolling, cold drawing, and heat treatment lines, ensuring consistent mechanical properties, tight dimensional tolerances (cold drawn ±0.05mm), and stable supply for round, square, flat, and hexagonal bars.
2.Quality Assurance:Strict control of chemical composition, tensile strength, hardness, and surface finish; 100% eddy current or ultrasonic testing (for critical applications); compliant with ASTM A276, A479, JIS G4303, EN 10088, GB/T 1220.
3.Certifications & Reports:Mill test certificates (MTC) with each shipment; third-party inspections (SGS, BV) and PMI test reports available upon request.
4.Customization & Service:Wide grade range (201, 304, 316L, 321, 410, 420, 430), shapes (round, square, flat, hex), sizes (round 3–300mm, flat 3×10–20×200mm, hex 4–100mm), custom lengths, surface finishes (black, pickled, bright, polished), and solution annealing with fast lead times.
5.Export Packaging:Interleaved paper/plastic separators + VCI paper + moisture-proof wrapping + wooden crates/ISPM-15 pallets + steel strapping + edge protectors for safe sea freight and scratch-free delivery.
FAQ
1. How to store stainless steel bars to prevent surface damage and corrosion?
Store on dry wooden racks or plastic supports, keep original wrapping, avoid contact with carbon steel tools or surfaces. For long-term storage, keep VCI paper and moisture-proof cover intact. Clean with stainless steel cleaner before use if any contamination.
2. Can stainless steel bars be machined (turned, drilled, milled) easily?
Yes. Stainless steel bars are suitable for CNC turning, drilling, and milling. Use sharp carbide tools, proper coolant, and moderate speeds to avoid work hardening. Annealed or solution treated bars provide the best machinability.
3. What is the difference between 304 and 316L stainless steel bars for corrosion resistance?
304 offers good general corrosion resistance for most indoor and mild outdoor environments. 316L contains molybdenum, providing superior resistance to chlorides, acids, and marine environments, making it ideal for coastal, chemical, and pharmaceutical applications.
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PARTNERS
CERTIFICATES
Certification
Intellectual Property Management System Certification
British CARES Certification
EU PEDM Product Certification Certificate
EU CPR Product Certification Certificate
DNVM120 Certification for Offshore Steel
AD2000 Certification for Boilers and Pressure Vessels
Russian Maritime Register of Shipping Certificate
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