What are the heat treatment methods for valve stem materials?
1. GB1220 12Cr13 (Quenching + high temperature tempering)
2. ASTM A182 F6a II (Normalizing + high temperature tempering)
3. ASTM A182 F6a II (normalizing + secondary tempering ≤22HRC)
4. Solid solution of ASTM A182 F316, F304, F316L, F304L, F321, F317, F37, etc
5. ASTM A182 F51 (Solid solution treatment)
6. ASTM A182 F53 (Solid solution treatment)
7. 25Cr2MoIVA (normalizing + high temperature tempering)
8. 20Cr1Mo1V1A (normalizing + high temperature tempering)
9. AISI 4140 (Quenching + tempering)
10. ASTM A182 F11 (normalizing + high temperature tempering)
11. GB1220 2Cr13 (Quenching + high temperature tempering)
12. ASTM A182 F5 (Normalizing + tempering)
13. ASTM A182 F44 (Solid Solution)
14. ASTM A182 F53 (Solid Solution)
15. ASTM A182 F55 (Solid Solution)
16. ASTM B649 N08904 (904L) (Solution)
17. ASTM A182 FXM-19 (Solid Solution)
18, ASTM B654 UNS (INCONEL 625), (INCONEL 600) (Annealing)
19, ASTM B637 UNS N07718 (INCONEL 718) (Solution + precipitation hardening)
20, ASTM B564 UNS (INCOLOY 800), (INCOLOY 825) (annealing)
21. ASTM A638 660 (solid solution + precipitation hardening)
22. ASTM B865 UNS N05500 (MONEL K-500) (Solution treatment + aging treatment)
23. Qal9-4 (Annealing)
