ASTM A268 Stainless Steel Pipe

ASTM A268 is a globally recognized standard specification for seamless and welded ferritic, martensitic, and austenitic stainless steel tubing designed for general corrosion-resistant service and high-temperature applications. Unlike specialized sanitary standards like ASTM A270, ASTM A268 focuses on industrial durability, balancing cost-effectiveness with robust performance in harsh conditions. Our ASTM A268 stainless steel pipe is manufactured without filler metal, ensuring structural integrity and consistency across every batch.

Key Specifications & Material Grades​

Standard: ASTM A268

Grades: TP430, TP444, TP410

Outside Diameter (OD): 3.18mm – 830mm (0.125" – 32.67") for seamless; 10.3mm – 457mm (0.405" – 18") for welded​

Wall Thickness: 0.2mm – 60mm (0.008" – 2.36") with precise tolerances per ASTM A268​

Length: 1m, 6m, 12m, or customized up to 12 meters (40ft)​

Schedule: Sch 10, Sch 40, Sch 80, and custom schedules

Applications: Heat Exchangers, Mechanical Components, Automotive Exhaust Systems, General Structural Components

Chemical Composition & Mechanical Properties​

Core Chemical Elements (Typical Ranges)​

Chromium (Cr): 11% – 30% (forms a passive oxide layer for corrosion resistance)​

Nickel (Ni): 0% – 12% (enhances ductility and corrosion resistance in austenitic grades)​

Molybdenum (Mo): 0% – 3% (improves pitting resistance in TP316L/TP444)​

Carbon (C): ≤ 0.15% (minimizes carbide precipitation)​

Mechanical Performance (Annealed Condition)​

Tensile Strength: ≥ 515 MPa (75 ksi)​

Yield Strength: ≥ 275 MPa (40 ksi)​

Elongation: ≥ 20% (in 50mm)​

Hardness: ≤ HB 223​

Manufacturing Process & Quality Control​

Our ASTM A268 stainless steel pipe undergoes strict production and testing protocols to ensure compliance:​

Raw Material Sourcing: High-purity stainless steel billets/strips from ISO-certified suppliers​

Forming:​

Seamless: Hot extrusion or cold drawing/pilgering for precision​

Welded: TIG/MIG welding with automated seam tracking; post-weld heat treatment for homogeneity​

Heat Treatment:​

Annealing: 760°C – 980°C (improves ductility, relieves stress)​

Stress Relieving: 400°C – 500°C (reduces manufacturing-induced stresses)​

Quenching & Tempering (optional): For high-strength applications​

Surface Finishes: 2B, 2D, BA (bright annealed), No.1, 8K mirror polish, sandblasting

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Email: judesteel@juqing.hk

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