Chemical Processing Industry			Flue Gas Desulfurization (FGD)
Reactor Vessel 10-15% Sulfuric Acid + Solids/Impurities 212°F (100°C) — 12 Months			Pulverized Coal Fire Unit 4.8% Sulfur Outlet Duct 129°F (54°C) — 27 Months
Corrosion Rate (mpy)		Remarks		Depth of Attack
Corrosion Rate (mpy)		Remarks		Pitting (in.)	Crevice (in.)
316L Stainless Steel	>61	Sample Dissolved	316L Stainless Steel	0.011	0.015
Carpenter 20Cb-3^® alloy	>57	Sample Dissolved	Alloy 904L	0.010	0.005
Alloy 825	>58	Sample Dissolved	Jessop JS700 alloy	0.010	0.011
HASTELLOY^® B-2 alloy	>58	Sample Dissolved	HAYNES 625 alloy	No Attack	0.005
HAYNES^® 625 alloy	29	Severe Corrosion Attack	HASTELLOY C-276 alloy	No Attack	0.007
HASTELLOY C-276 alloy	28	Severe Corrosion Attack	HASTELLOY C-22 alloy	No Attack	0.002
HASTELLOY C-22^® alloy	4.7	Slight Corrosion Attack
Refinery Industry			Chemical Waste Invineration
Coke Refinery Vaporizer 203°F (95°C) — 2 Months			Rotary Kiln Industiral Organic Quench Duct 300°F (149°C) — 4 Months
Corrosion Rate (mpy)		Remarks	Corrosion Rate (mpy)		Remarks
316L Stainless Steel	139	Severe Crevice Attack	Carbon Steel	>353	Severe Crevice Attack
Carpenter 20Cb-3^® alloy	227	Partially Dissolved	316L Stainless Steel	>160	Partially Dissolved
Avesta 254 SMO^® alloy	83	Pitting, Crevice Attack	Avesta 254 SMO alloy	83	Pitting, Crevice Attack
Allegheny AL-6XN^® alloy	60	Pitting, Crevice Attack	HAYNES 625 alloy	64	Pitting, Crevice Attack
HAYNES 625 alloy	29	Pitting, Crevice Attack	HASTELLOY C-276 alloy	53	Pitting, Crevice Attack
HASTELLOY C-22 alloy	3.4	Slight Crevice Attack	HASTELLOY C-22 alloy	27	Slight Crevice Attack
Pulp and Paper Industry			Chemical Waste Incineration
Ammonium Sulfite-Type Mill C-Stage Washer 75°F (24°C) — 8 Months			Ammonia Stripping Process Waste Water 160°F (71°C) — 3 Months
	Depth of Attack			Depth of Attack
	Pitting (in.)	Crevice (in.)		Pitting (in.)	Crevice (in.)
316L Stainless Steel	0.030	0.045	Carbon Steel	0.040	0.050
Alloy 904L	0.023	0.029	316L Stainless Steel	0.005	0.005
Avesta 254 SMO alloy	0.015	No Attack	Allegheny AL-6XN alloy	0.005	No Attack
HAYNES 625 alloy	0.005	No Attack	HAYNES 625 alloy	0.004	No Attack
HASTELLOY C-22 alloy	0.002	No Attack	HASTELLOY C-276 alloy	No Attack	No Attack

Haynes International, Inc. 800-354-0806 765-456-6012

HASTELLOY® C-22® alloy Information*

HASTELLOY^® C-22^® alloy Information*