A479 TP 410 VS. A276 TP 410: What’s the difference?
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What is TP 410 stainless steel?
410 stainless steel (UNS S41000) is a martensitic stainless steel known for its good corrosion resistance, strength, and hardness. But when sourcing 410 stainless steel for a project, you may encounter two different ASTM standards:
ASTM A276 TP 410
ASTM A479 TP 410
Although both refer to the same grade of steel, they are not interchangeable and serve different purposes.
1. ASTM A276 TP 410 vs A479 TP 410
| Feature | A276 TP 410 | A479 TP 410 |
|---|---|---|
| Standard Title | Standard for Stainless Steel Bars and Shapes | Standard for Stainless Steel Bars for Pressure Vessels |
| Product Form | Hot/cold finished bars, flats, angles, rounds | Bars, rods, and forgings intended for pressure vessels |
| Application Scope | General engineering and structural uses | High-temperature or high-pressure environments (ASME) |
| ASME Code Compatibility | Not necessarily ASME-compliant | Explicitly intended for ASME Section VIII and B31.3 use |
| Surface Finish/Testing | Standard mechanical finish, no code requirement | Often requires stricter testing and documentation |
✅ Conclusion: A479 TP 410 is pressure vessel–grade with code compliance, while A276 TP 410 is general-purpose.
2. Difference between A276 and A479
Both standards refer to UNS S41000, so the chemical composition and mechanical properties are typically identical.
Chemical Composition (typical for 410 SS):
Carbon: 0.15% max
Chromium: 11.5–13.5%
Manganese: 1.0% max
Silicon: 1.0% max
Phosphorus/Sulfur: ≤0.04% / ≤0.03%
Mechanical Properties (Annealed Condition):
| Property | Value |
|---|---|
| Tensile Strength | ≥ 480 MPa (70 ksi) |
| Yield Strength | ≥ 275 MPa (40 ksi) |
| Hardness | ≤ 207 HBW (annealed) |
| Elongation | ≥ 20% |
Is A276 TP 410 the same as A479 TP 410?
They use the same UNS S41000 stainless steel, but A479 is for pressure vessel applications and must meet stricter documentation and testing standards.
Can A276 be substituted for A479?
Not in ASME code pressure vessel or piping applications. A479 is required for compliance.
What does TP mean in A276 or A479 TP 410?
"TP" stands for "Type", indicating the stainless steel grade - in this case, Type 410.
If you're sourcing 410 stainless steel for general machining or structural use, A276 TP 410 is typically sufficient.
But if your application involves pressure vessels, boilers, or ASME B31.3 piping, you must choose A479 TP 410 for compliance and safety.
💡 When in doubt, always verify your project's code requirements before material selection.
