Stainless steel pipe is a hollow, long strip metal pipe made primarily of austenitic stainless steel (such as 304 and 316L). It possesses excellent corrosion resistance, high temperature resistance, easy cleaning, and long service life, and is widely used in food, medical, chemical, municipal, and construction industries. Its manufacturing process is divided into two categories: seamless pipe and welded pipe, and the connection methods are mainly double-press type and ring-press type.
As a professional stainless steel pipe manufacturer, we offer a full range of stainless steel grades (304, 316L, 321, etc.) and shapes (round, square, rectangular, etc.), and provide customized length, diameter, and wall thickness services.
Specification
| Item | Stainless Steel Pipe |
| Standard | ASTM A312, A269; EN 10216-5; GB/T 14976 |
| Material | 304, 304L, 316, 316L, 321, 310S, 430, 2205, etc |
| Surface Finish | BA/NO.1/NO.3/NO.4/8K/HL/2D/1D |
| Length | 1-12 m |
| Thickness | 0.25mm – 4.0mm |
| OD | 10-2000mm |
| Color | Silver, red, blue, green |
| Price Item | FOB, CIF, EXW, CFR, etc |
| Packing | Standard export packaging |
Advantages of SS Steel Pipe
Surface Treatment
- Mirror Polishing: A smooth, mirror-like surface (Ra≤0.2μm), used in food and pharmaceutical industries, meeting GMP standards.
- Acid Pickling and Passivation: Acid pickling removes the oxide layer, followed by passivation to form a protective film, improving corrosion resistance. Commonly used in post-weld treatment.
- Wire Drawing: Mechanical friction creates straight lines, enhancing aesthetics. Suitable for decorative pipes.
- Bright Finish (BA): Bright annealing treatment, resulting in a glossy surface and restored corrosion resistance. Suitable for high-end equipment.
- Sandblasting: High-speed blasting of abrasive particles creates a matte finish (Ra 1.6-12.5μm), improving wear resistance. Used in industrial equipment.
Application Scenarios
1. Applications of Stainless Steel Round Tubes
Milk, beer, juice, and food processing pipelines; pharmaceutical, purified water, medical gas, and equipment pipelines; acid, alkali, and solvent transportation; reactor pipelines; offshore platforms; sewage treatment; drinking water transportation; and automobile exhaust pipes.
2. Applications of Stainless Steel Square Tubes
A backbone material for building structures and decoration. Widely used in building frames, stair railings, door and window frames, and shopping mall display racks (304/HL/brushed).
3. Applications of Stainless Steel Rectangular Tubes
Used for load-bearing and supporting structures, commonly found in curtain wall framing, equipment racks, building facades, vehicle bodies, machinery housings, and warehouse shelves.
4. Applications of Stainless Steel Oval Tubes
Used for high-end decoration and specific scenarios. Used for railings, specialty furniture, artistic decorations, and also for some pipelines.
5. Applications of Stainless Steel Special-Shaped Tubes
Non-standard customized shapes, commonly hexagonal, triangular, and semi-circular, used for precision mechanical parts, special components, lighting fixtures, and architectural decoration.
Material Grade Classification
- 304: The most common austenitic stainless steel, containing 18% chromium and 8% nickel, possessing excellent corrosion resistance.
- 304L: A low-carbon version of 304, with a carbon content ≤0.03%, reducing the risk of intergranular corrosion after welding.
- 316: Based on 304, approximately 2%-3% molybdenum is added, significantly improving resistance to pitting and crevice corrosion.
- 316L: A low-carbon variant of 316, combining resistance to chloride ion corrosion and weldability, suitable for harsh environments.
- 430: An economical ferritic stainless steel with good resistance to atmospheric corrosion and stress corrosion cracking, and is magnetic.
- 409L: A more economical titanium-stabilized ferritic stainless steel, known for its excellent resistance to high-temperature oxidation and thermal fatigue.
- 2205: A typical duplex stainless steel, with corrosion resistance approaching that of austenitic steel and strength nearly twice that of 304.
- 2507: Super duplex stainless steel, with excellent resistance to chloride pitting corrosion, crevice corrosion and stress corrosion, and also has higher strength.
Manufacturing Process
Seamless Stainless Steel Pipe
Formed from steel billets through piercing and cold drawing/hot rolling, it has no weld seams, high strength, and is suitable for high-pressure and fluid transportation.
Welded Stainless Steel Pipe
Formed from cold-rolled steel strip and then subjected to resistance welding (ERW), submerged arc welding (LSAW), argon arc welding/gas metal arc welding (TIG/MIG), or high-frequency welding. It has a smooth surface, lower cost, and is used for medium and low-pressure applications.
Standards system
1. Chinese National Standards (GB): GB/T 14976 (Seamless), GB/T 12771 (Welded), GB/T 19228.2 (Pressure Press Fittings), GB/T 8163 (Seamless Steel Pipes for Fluid Transportation), GB/T 12771 (Thin-Walled Stainless Steel Water Pipes).
2. American Standards (ASTM): ASTM A312 (General Purpose Piping, Seamless and Welded Austenitic Stainless Steel Tubes), ASTM A269/A270 (Sanitary), A511 (Machinery Tubes).
3. European Standards (EN): EN 10216-5 (Pressure Seamless), EN 10217-7 (Pressure Welded), EN 10088 (Materials Standards).
Mechanical Properties
Our stainless steel pipes meet strict mechanical requirements for different grades and applications. The following data reflects the minimum performance standards:
| Standard | Grade | Tensile Strength | Yield Strength | Elongation | Hardness |
| ASTM A312 | 304 | 515-720 MPa | ≥ 205 MPa | ≥ 40% | ≤ 201 |
| ASTM A312 | 316L | 485-685 MPa | ≥ 170 MPa | ≥ 40% | ≤ 192 |
| EN 10216-5 | S30400 | 510-700 MPa | ≥ 200 MPa | ≥ 40% | ≤ 201 |
| EN 10216-5 | S31603 | 480-670 MPa | ≥ 170 MPa | ≥ 40% | ≤ 192 |
| GB/T 14976 | 06Cr19Ni10 (304) | 515-720 MPa | ≥ 205 MPa | ≥ 40% | ≤ 201 |
| GB/T 14976 | 022Cr17Ni12Mo2 (316L) | 485-685 MPa | ≥ 170 MPa | ≥ 40% | ≤ 192 |
| ASTM A312 | 2205 (Duplex) | 620-850 MPa | ≥ 450 MPa | ≥ 25% | ≤ 290 |
Key Notes:
- Duplex stainless steel (2205/2507) has significantly higher yield strength than austenitic grades, reducing material usage for structural projects.
- Low-carbon grades (304L/316L) avoid intergranular corrosion after welding, suitable for high-temperature applications.
Weight Calculation Formulas
Theoretical weight (kg/m) is calculated based on carbon steel density (7.85g/cm³); for stainless steel, multiply by a density coefficient (1.01 for austenitic grades, 0.99 for ferritic grades).
| Pipe Shape | Formula | Variables |
| Stainless Steel Round Pipe | Weight = (OD – T) × T × 0.02491 × Density Coefficient | OD: Outer Diameter (mm) Wall Thickness (mm) |
| Stainless Steel Square Pipe | Weight = (4A – 4T) × T × 0.00785 × Density Coefficient | A: Side Length (mm)ickness (mm) |
| Stainless Steel Rectangular Pipe | Weight = (2A + 2B – 4T) × T × 0.00785 × Density Coefficient | A: Long Side (mm): Short Side (mm)T: Wall Thickness (mm) |
| Stainless Steel Oval Pipe | Weight = (A + B – 2T) × T × 0.0222 × Density Coefficient | A: Major Axis (mm): Minor Axis (mm)T: Wall Thickness (mm) |
Connection and Installation
- Welded type: Primarily argon arc welding, requires professional welders. The weld seam needs inert gas protection; otherwise, it is prone to oxidation and rust.
- Double-clamp type: Uses specialized hydraulic clamps to apply radial pressure to the pipe fitting, compressing the internal O-ring seal for lifelong leak prevention. No welding required, high installation efficiency, suitable for residential and public buildings.
- Ring-clamp type: A raised ring is rolled onto the pipe end and then clamped. Removable, suitable for industrial systems requiring ongoing maintenance.
FAQs
Stainless Steel Pipe Manufacturer- Glory Steel
Why Industry Leaders Choose Us?
1. Quality Assurance: Ensuring that the chemical composition and physical properties of every batch of raw materials meet top standards, controlling quality from the source.
2. Intelligent Production Line: Fully automated high-speed laser welding, precision cold drawing, and online solution heat treatment ensure high dimensional accuracy and surface finish.
3. Factory Price: Direct sales from the source manufacturer; large stock of standard sizes; custom sizes and bulk orders can be responded to quickly and delivered promptly.
4. Flexible Customization: From selection to installation, technical support, and OEM/ODM services are provided.
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