Product Details
Straight Tubes
Dumai Tube supplies 300 series and 400 series stainless steel tubes for automotive exhaust systems, bending, fabrication, machinery, and industrial applications. Tubes are available in raw finish, polished finish, or customized surface treatment, with TIG, laser welding production.
Material Grades
| Series | Common Grades | Surface Finish |
|---|---|---|
| 300 Series Austenitic Stainless Steel | 304, 304L, 316, 316L, 321, 310S | Raw, 2B, polished, brushed, mirror polished, customized |
| 400 Series Ferritic Stainless Steel | 409, 409L, AL409L / 409AL, 430, 436L, 439, 441 | Raw, polished, brushed, customized |
| Customized Grades | According to customer standard | According to customer requirement |
Commonly used materials include 304, 316, 409, AL409/409AL, and 436 stainless steel. These materials are widely used in automotive exhaust systems, mufflers, tailpipes, mandrel bends, exhaust assemblies, and customized tube components. According to different application requirements, we can recommend suitable materials for corrosion resistance, heat resistance, bending performance, end forming, and cost efficiency.
Mandrel Bends
Dumai Tube can supply stainless steel mandrel bends in different materials, diameters, wall thicknesses, bend angles, and bend radius options. Our bends can be produced according to customer drawings, samples, or application requirements.
| Product Type | Available Options |
|---|---|
| Material Grades | 304, 304L, 316L, 321, 409L, AL409L / 409AL, 430, 439, 441 |
| Bend Radius | 1D, 1.1D, 1.2D, 1.5D, 1.6D, 2D, 3D, or customized |
| Bend Angle | 15°, 30°, 45°, 60°, 90°, or customized |
| Tube Type | ERW welded, TIG welded, laser welded, or seamless tube bends |
| Surface Finish | Raw, polished, brushed, or customized |
| End Type | Plain end, expanded end, reduced end, slotted end, or customized |
Our mandrel bends are available in multiple radius options to meet different exhaust, automotive, and industrial fabrication requirements. Common bend radius includes 1D, 1.1D, 1.2D, 1.5D, 1.6D, 2D, with customized radius and angle available upon request.
SPECIAL SHAPE TUBES
Beyond Standard Round Tubing
Standard round tubing can limit design and structural possibilities. Dumai Tube manufactures precision special shape steel tubes to support advanced product design, improved ergonomics, and optimized structural performance. Our forming capability delivers consistent dimensions, clean weld seams, and reliable strength across a wide range of profiles.
Available Profiles
Customization Options
Our special shape tubes can be customized based on your project requirements:
- Outer dimensions (A × B)
- Wall thickness
- Steel grade / material specification
- Surface finish (Black, Galvanized, Pickled & Oiled, Powder Coated, etc.)
- Length (cut-to-size available)
- Production according to EN / ASTM standards or customer drawings
Product Range Overview
| Profile Type | Typical Size Range (A × B, mm) | Wall Thickness Range (mm) | Common Use |
|---|---|---|---|
| Oval Tube | 22×15 to 50×25 | 0.6 – 3.0 | Gym equipment, furniture frames |
| Semi-Oval Tube | 30×15 to 36×18 | 0.8 – 3.0 | Handrails, decorative structures |
| Elliptical Tube | 40×20 to 50×25 | 0.8 – 3.0 | Automotive parts, structural frames |
| Square Tube | 12×12 to 60×60 | 0.6 – 3.0 | Machinery, steel construction |
| Rectangular Tube | 15×10 to 50×30 | 0.6 – 3.0 | Furniture, industrial structures |
| Octagonal Tube | 30×19 | 1.0 – 3.0 | Special structural applications |
Why Choose Dumai Tube
●Precision forming and stable dimensional control
●Smooth surface and clean weld appearance
●Consistent quality for bulk orders
OEM support and custom development available
Export-ready packaging and professional shipment handling
