1. Material Standards & Grades

Primary Standards:

• ASTM A312/A312M: Seamless and Welded Austenitic Stainless Steel Pipes

• ASTM A358/A358M: Electric-Fusion-Welded Austenitic Steel Pipe

• ASTM A554: Welded Stainless Steel Mechanical Tubing

• GB/T 12771: Stainless Steel Welded Pipes for Fluid Transport

Common Material Grades:

2. Chemical Composition Requirements

3. Mechanical Properties

4. Physical Properties (Typical)

5. Manufacturing Process & Quality Control

Production Process:

• Material Preparation → Uncoiling & Leveling → Roll Forming

• Welding (TIG/HF/Laser) → Weld Seam Treatment

• Sizing & Straightening → Cutting to Length

• Heat Treatment → Surface Treatment → Testing & Inspection

Quality Assurance Tests:

• Hydrostatic Pressure Test

• Eddy Current Testing

• Ultrasonic Testing

• Flattening Test

• Flaring Test

• Reverse Flattening Test

• Mechanical Property Testing

• Intergranular Corrosion Test

6. Technical Specifications

7. Surface Finish Options

8. Application Areas

By Industry:

• Chemical Industry: Acid/alkali transport, chemical equipment

• Food & Beverage: Processing lines, brewing systems

• Architecture: Handrails, structural components, decorative elements

• Automotive: Exhaust systems, structural parts

• Pharmaceutical: Process piping, clean utilities

• Energy: Heat exchangers, boiler tubes

By Service Environment:

• High temperature applications (up to 870°C for 304)

• Corrosive media transport

• Structural and mechanical applications

• Sanitary and clean service

Material Selection Guidance:

• 304/304L: General corrosion resistance, most common choice

• 316/316L: Enhanced chloride resistance, chemical processing

• 321: High temperature service, welded structures

• 310S: Extreme high temperature applications

• 201: Cost-effective alternative for mild environments

All materials are supplied with complete Mill Test Certificates and comply with relevant international standards.