Materials

Module from the Heat Exchanger Engineering Curriculum curriculum.

Module 7 - Tube Materials (IPE-EP-8-1-9) · Learning Objectives · 1. Match tube material to both shell-side and tube-side fluids · 2. Consider erosion, galvanic coupling, and welding compatibility · 3. Apply CUI protection for insulated bundles · 4. Select CuNi, SS, duplex, Ti for seawater and chlorinated CW · 5. Verify PMI for alloy tubes per API 578 · Tube Material Selection

Material	Max T (F)	Services Suitable	Services Avoid	Cost Index	Note
A213 T11 (1.25Cr-0.5Mo)	1050	Hot oil, H2 <450F	Chloride wet	1.5	Common alloy
A213 T22 (2.25Cr-1Mo)	1100	Hot oil, H2 400-800F	Chloride wet	2.0	Hydroproc
A213 TP304/304L	1500	Chloride-free corrosive	CL > 100 ppm	2.5	Avoid CSCC
A213 TP316/316L	1500	Mild chloride (<200ppm)	Severe chloride	3.0	Better vs 304
A213 TP321/347 stabilized	1500	High-T SS		3.5	No PWHT cracking
Admiralty (70Cu-29Zn-1Sn)	400	Condenser CW	H2S	1.5	Traditional
CuNi 90/10	500	Seawater	H2S	3.0	Marine
CuNi 70/30	600	Severe seawater	H2S	4.5	Best CuNi
Titanium Gr 2	600	Seawater, chlorides	HF acid, Cl2	8.0	Premium CW
Duplex 2205 (S31803)	600	Chlorides + H2S	High-T creep	4.5	Best combo
Monel 400	1000	HF acid	Oxidizing	6.0	Alkylation
Alloy 625/825	1200	Severe acid, H2S	Very high cost	12-20	Last resort

Source: Heat_Exchanger_Engineering_Curriculum_v1.xlsx · Sheet: Materials

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