ASTM A105 carbon steel forgings are normally supplied in the as-forged condition, but heat treatment is required in certain cases.
🔥 Heat Treatment Requirements for ASTM A105
✅ Mandatory Heat Treatment Conditions (per ASTM A105/A105M):
For components above certain size limits:
If any part of the forging cross-section exceeds 4 inches (102 mm), heat treatment is required.
For flanges or forged fittings used in sour service (NACE MR0175 / ISO 15156):
Heat treatment is mandatory (usually normalizing or normalize & temper).
When required by purchaser specification or project standards, the following treatments may be applied:
Normalize
Normalize and Temper
Quench and Temper
🛠 Common Heat Treatment Types for ASTM A105
| Treatment | Purpose |
|---|---|
| Normalizing | Refines grain structure and improves toughness. Typically done at 890–950°C. |
| Tempering | Reduces hardness after normalizing or quenching to improve ductility. |
| Quenching & Tempering | Enhances strength and toughness. Quench in water/oil, then temper. |
| Annealing (less common) | Softens material and improves machinability. |
📌 Example:
A large ASTM A105 flange with a 6-inch thickness for sour gas application would typically be normalized and tempered to meet both mechanical property requirements and NACE standards.
Let me know if you need the heat treatment procedure, furnace temperature range, or a sample MTC (Mill Test Certificate) heat treatment section.
