ASTM A268 TP410 Seamless Tube For Steam Condensers and Feedwater Heaters

1. Material Composition (TP410):

Chromium (Cr): 11.5–13% (provides moderate corrosion resistance).

Carbon (C): 0.08–0.15% (enables heat treatment for hardening).

Other elements (Mn, Si, etc.) in smaller amounts.

2. Mechanical Properties (Typical after Heat Treatment):

Tensile Strength: ~70 ksi (485 MPa).

Yield Strength: ~45 ksi (310 MPa).

Hardness: Adjustable via quenching and tempering.

3. Manufacturing & Testing:

Seamless Production: Made via extrusion/piercing, offering superior strength and uniformity for high-pressure applications.

Testing Requirements: Hydrostatic/NDT (e.g., eddy current), chemical analysis, and mechanical tests (tensile, hardness).

4. Key Characteristics:

High Strength: Suitable for stress-bearing applications.

Moderate Corrosion Resistance: Less than austenitic grades (e.g., 304/316); ideal for mild environments.

Magnetic: Inherent to martensitic structure.

Heat Treatable: Supplied in annealed condition for formability, then hardened as needed.

5. Applications:

Industrial: Hydraulic systems, instrumentation, fuel lines.

Automotive: Exhaust components, turbine parts.

General Engineering: Fasteners, pump shafts, boiler tubes.

6. Limitations & Considerations:

Corrosion: Avoid highly corrosive environments (e.g., chlorides/acids) without coatings.

Welding: Requires pre/post-heat treatment to prevent cracking.

Cost: Seamless tubes are typically more expensive than welded alternatives.