304 Stainless Steel Welded Pipe 18/8 Stainless Tube ASTM A312 Standard For Industrial Pipeline

304 Stainless Steel Welded Pipe 18/8 Stainless Tube ASTM A312 Standard For Industrial Pipeline

1. Product Overview
304 stainless steel welded pipe is a classic 18-8 austenitic stainless steel welded tube manufactured by advanced rolling, forming and welding technology, complying with ASTM A312, GB/T, and JIS industrial standards. It features excellent corrosion resistance, superior ductility, stable high-temperature performance and outstanding weldability. Compared with seamless pipes, 304 welded stainless steel pipes have higher cost performance, uniform wall thickness and smooth surface, which are widely recognized in global industrial and civil engineering fields. All products undergo strict non-destructive testing to ensure no welding defects and stable overall performance.

2. Chemical Composition (Standard Range, %)
The standardized chemical composition strictly follows international industrial standards, ensuring the stable 18/8 stainless steel properties and long-term anti-corrosion performance:
- Carbon (C): ≤0.08
- Silicon (Si): ≤1.00
- Manganese (Mn): ≤2.00
- Phosphorus (P): ≤0.045
- Sulfur (S): ≤0.030
- Chromium (Cr): 18.00-20.00
- Nickel (Ni): 8.00-10.50
The reasonable Cr-Ni alloy ratio endows the pipe with excellent oxidation resistance and electrochemical corrosion resistance, effectively resisting rust and damage in humid, acidic and alkaline environments.

3. Mechanical Properties (Annealed State, Room Temperature, ASTM A312 Standard)
304 stainless steel welded pipe has stable mechanical properties, good toughness and processability, suitable for bending, cutting, welding and other secondary processing:
- Tensile Strength: ≥515 MPa (Typical value: 580-750 MPa)
- 0.2% Yield Strength: ≥205 MPa (Typical value: 240-310 MPa)
- Elongation: ≥35%-40%
- Hardness: ≤90 HRB / ≤187 HB
- Density: 7.93 g/cm³
- Maximum Continuous Service Temperature: 870°C
With high ductility and low hardness, the pipe is not easy to crack during processing and installation, and maintains good structural stability under high temperature and conventional pressure working conditions.

4. Core Product Advantages
- Excellent Corrosion Resistance: Resists atmospheric corrosion, water corrosion, weak acid and alkali corrosion, suitable for outdoor and humid working environments, long service life.
- Superior Process Performance: Excellent weldability (suitable for TIG, MIG and resistance welding), easy to bend, form and machine, low processing cost.
- Stable High-temperature Resistance: Retains stable mechanical properties at high temperature, not easy to deform or oxidize.
- Smooth Surface & Precise Size: Uniform wall thickness, no burrs, clean inner and outer wall, low fluid resistance, conforms to high-precision pipeline installation requirements.
- Cost-effective: More competitive price than seamless stainless steel pipes with equivalent performance, ideal for large-scale engineering procurement.

5. Wide Applications
304 stainless steel welded pipe is one of the most versatile stainless steel pipes, widely used in various industries worldwide:
- Fluid Pipeline Industry: Water supply and drainage pipelines, drinking water purification pipelines, gas, oil and liquid transmission pipelines.
- Chemical & Pharmaceutical Industry: Conveying pipelines for weak acid, weak alkali and chemical medium, pharmaceutical equipment supporting pipes.
- Construction & Decoration: Building guardrails, stair handrails, architectural decorative pipes, structural support pipes.
- Food & Beverage Industry: Food processing, beverage production and sanitary pipeline systems, meeting food-grade safety standards.
- Mechanical & Power Industry: Boiler auxiliary pipes, heat exchanger pipes, mechanical equipment matching pipelines, high-temperature ventilation pipes.
- Environmental Protection Industry: Sewage treatment, waste gas treatment and environmental protection equipment supporting pipelines.

6. Photo :