ASTM A312 Stainless Steel Pipes
Premium Austenitic Stainless Steel Solutions for Industrial Fluid Transport
Ganyeah Group is proud to offer high-quality ASTM A312 Stainless Steel Pipes, manufactured to meet the demanding requirements of global clients in the chemical, petrochemical, food processing, and energy industries. With over 20 years of manufacturing experience, we ensure every pipe delivers exceptional corrosion resistance, mechanical strength, and clean weld integrity — critical for today’s industrial environments.
ASTM A312 TP304 Stainless Steel Pipes
Overview of ASTM A312 Standard
ASTM A312 is the authoritative specification for seamless and welded austenitic stainless steel pipes used in high-corrosion fluid transport systems. It covers a wide range of pipe types, sizes, and surface finishes, making it the go-to standard for fluid piping in industrial applications.
Scope and Pipe Types:
Seamless stainless steel pipes (hot finished or cold worked)
Welded stainless steel pipes (TIG or MIG welded)
Cold-worked pipes after welding or seamless processing
Size Range:
Outside diameter: 1/8″ (6.4 mm) to 30″ (760 mm)
Wall thickness: SCH 5S to SCH XXS
Typical Applications:
Chemical and petrochemical pipelines
Food and pharmaceutical fluid systems
Water treatment and desalination facilities
High-hygiene architectural piping
Manufacturing and Quality Requirements
At Ganyeah Group, we strictly adhere to ASTM A312 production and testing requirements to ensure superior product integrity.
Welding Methods:
Welded pipes are produced using automatic TIG or MIG welding
Radiographic inspection available upon request
Heat Treatment:
All pipes undergo solution annealing between 1000–1150°C
Rapid quenching preserves corrosion resistance and mechanical properties
Surface Finish Options:
Acid pickling and passivation
Mechanical polishing (2B, BA finishes)
Sanitary finish for pharmaceutical-grade applications
Testing & Inspection:
Hydrostatic or non-destructive testing (NDT)
Flattening and tensile strength tests
Intergranular corrosion tests per ASTM A262
Material Grades and Mechanical Properties
The ASTM A312 standard includes a broad range of austenitic stainless steel grades tailored to specific operating conditions:
- Standard 18/8 Grades
TP304: Cr 18–20%, Ni 8–11%, C ≤ 0.08%
TP304L: Low-carbon version (C ≤ 0.03%) for improved weld resistance
TP304H: High-carbon (C ≥ 0.04%) version for high-temperature strength
| Grade | Tensile (MPa) | Yield (MPa) | Elongation (%) | Hardness (HRB) |
| TP304 | ≥515 | ≥205 | ≥35 | ≤90 |
| TP304L | ≥485 | ≥170 | ≥35 | ≤90 |
| TP304H | ≥515 | ≥205 | ≥35 | ≤90 |
- Molybdenum-Enhanced Grades (For Chloride Environments)
TP316 / TP316L: Added Mo (2–3%) for superior pitting resistance
Excellent for marine, desalination, and high-chloride chemical media
- Stabilized Grades (For Welding Applications)
TP321: Ti-stabilized to resist carbide precipitation
TP347: Nb-stabilized for high-temperature corrosion resistance
- High-Alloy Grades (Extreme Environments)
TP310S: High Cr/Ni for oxidation resistance at ≤1100°C
UNS S31254: Super austenitic stainless steel with 6% Mo, tensile ≥650 MPa
Comparison: ASTM A312 vs ASTM A213
While both ASTM A312 and ASTM A213 serve stainless steel pipe applications, their focus areas differ significantly.
| Criteria | ASTM A312 | ASTM A213 |
| Pipe Types | Seamless, Welded, Cold-Worked | Seamless Only |
| Main Application | General Fluid Transport (Low/Med Pressure) | Boilers, Superheaters (High Temp/Pressure) |
| Size Range | 6.4 mm – 760 mm | 3.2 mm – 127 mm (Small Diameter) |
| Alloy Focus | Austenitic Stainless Steel | Austenitic + Ferritic Alloy Steel |
| Quality Emphasis | Corrosion Resistance, Weld Quality | Grain Size, Creep Strength |
| Testing | Hydro Test, Flattening, A262 IGC | High-Temp Tensile, Creep, Grain Size |
Crossover Grades:
Some grades like TP304H may meet both A312 and A213, but A213 has tighter control over carbon content (C ≥ 0.04%).
Application & Material Selection Guidance
Choose ASTM A312 Stainless Steel Pipes when:
You require corrosion-resistant piping for chemical, water, or hygienic applications
Welded pipes offer cost efficiency (e.g., TP304L welded pipe)
Flexibility in sizes and finishes is needed
Choose ASTM A213 when:
The piping is subject to high temperature and pressure
You need seamless pipes for superheaters or boilers
Grain size and creep strength are critical to service life
Cost Optimization:
For non-critical high-temperature service, TP321 from A312 can often replace TP321H from A213, offering better availability and lower cost.
Why Choose Ganyeah Group?
As a trusted global manufacturer, Ganyeah Group brings robust capabilities to the table:
ISO and PED-certified stainless steel production lines
In-house welding, pickling, polishing, and NDT facilities
Over 30,000 tons annual production capacity
Dedicated engineering and export team with 20+ years of industry knowledge
We serve clients in the Middle East, Europe, Southeast Asia, and beyond — delivering one-stop stainless steel piping solutions from raw materials to custom-cut pipe systems.
Product Availability
Standard Inventory Includes:
TP304 / 304L / 304H
TP316 / 316L
TP321 / TP347
TP310S / S31254 (Custom Order)
Dimensions:
OD: 6.4mm to 760mm
Wall Thickness: SCH 5S – SCH XXS
Length: Random, Fixed, or Custom Cut
Finish Options:
Mill Finish, 2B, BA, Polished (180/240/320 Grit)
Contact Us Today
Looking for a reliable partner for your next stainless steel piping project?
Contact Ganyeah Group today for expert consultation, samples, or technical data sheets.