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25 Commerce Road, Orillia, Ontario, Canada L3V 6L6 Phone (705) 325-2781 Fax (705) 325-5887 ALLOY DATA SHEET HEAT RESISTANT ALLOY HK REVISION: 04/91 DESCRIPTION HK alloy, more well known as HK 40, is an austenitic Fe-Cr-Ni alloy that has been a standard heat resistant material for over four decades. With moderately high temperature strength, oxidation resistance and carburization resistance the alloy is used in a wide variety of industrial applications. COMPOSITION C Mn Si Cr Ni P S Min % 0.35 0.4 0.5 23 19 - - Max % 0.45 1.5 1.5 27 22 0.03 0.03 APPLICATIONS Ammonia, methanol and hydrogen reformers; ethylene pyrolysis coils and fittings; steam superheater tubes and fittings; tube supports and hangers; tube sheets; heat treatment fixtures and trays; refractory supports; furnace skids; furnace rolls; rabble arms. PRODUCT FORMS Horizontal and vertical centrifugal castings; static castings. PHYSICAL PROPERTIES CARBURIZATION Density (lbs/in 3) 0.280 RESISTANCE Melting Point( o F) 2540 (Gas-1064 hours @ 1760 o F) Thermal Conductivity 7.9 @ 212 o F ALLOY WEIGHT GAIN (Btu/h/ft 2 /ft/ o F) 15.7 @ 1600 o F GRADE mg/mm 2 17.1 @ 1800 o F H F 0.81 Thermal Expansion 9.8 @ 70-1400 o F H H 0.58 (10 -6 in/in o F) 10.0 @ 70-1600 o F H K 0.56 10.2 @ 70-1800 o F H P 0.20 MECHANICAL PROPERTIES (Typical Values) Centrifugal Castings Static Castings 70 1400 1600 1800 2000 o F 70 o F U.T.S. K.S.I. 84 38 24 15 5.6 74 Y.S. K.S.I. 44 24 16 9 5 45 El. % 20 13 16 42 55 17 SERVICE TEMPERATURE The alloy is suitable for service at temperatures up to approximately 2000 o F. COMPARATIVE OXIDATION RATES (mm / year) (500 hour cyclic tests) GRADE 1832 1922 2012 2102 2204 o F H H <0.1 0.22 0.92 3.9 H K <0.1 0.22 0.95 3.5 12.7 H T 0.20 0.54 1.4 3.2 7.2

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Page 1: HK-40

25 Commerce Road, Orillia, Ontario, Canada L3V 6L6Phone (705) 325-2781 Fax (705) 325-5887

ALLOY DATA SHEET HEAT RESISTANT ALLOY

HK REVISION: 04/91

DESCRIPTIONHK alloy, more well known as HK 40, is an austenitic Fe-Cr-Ni alloy that has been a standard heat resistant material for over four decades. With moderately high temperature strength, oxidation resistance and carburization resistance the alloy is used in a wide variety of industrial applications.

COMPOSITIONC Mn Si Cr Ni P S

Min % 0.35 0.4 0.5 23 19 - -Max % 0.45 1.5 1.5 27 22 0.03 0.03

APPLICATIONSAmmonia, methanol and hydrogen reformers; ethylene pyrolysis coils and fittings; steam superheater tubes and fittings; tube supports and hangers; tube sheets; heat treatment fixtures and trays; refractory supports; furnace skids; furnace rolls; rabble arms.

PRODUCT FORMSHorizontal and vertical centrifugal castings; static castings.

PHYSICAL PROPERTIES CARBURIZATION

Density (lbs/in3) 0.280 RESISTANCE

Melting Point(oF) 2540 (Gas-1064 hours @ 1760oF)

Thermal Conductivity 7.9 @ 212oF ALLOY WEIGHT GAIN

(Btu/h/ft2/ft/oF) 15.7 @ 1600oF GRADE mg/mm2

17.1 @ 1800oF H F 0.81

Thermal Expansion 9.8 @ 70-1400oF H H 0.58

(10-6in/in oF) 10.0 @ 70-1600oF H K 0.56

10.2 @ 70-1800oF H P 0.20

MECHANICAL PROPERTIES (Typical Values)Centrifugal Castings Static Castings

70 1400 1600 1800 2000 oF 70 oFU.T.S. K.S.I. 84 38 24 15 5.6 74Y.S. K.S.I. 44 24 16 9 5 45El. % 20 13 16 42 55 17

SERVICE TEMPERATURE

The alloy is suitable for service at temperatures up to approximately 2000oF.

COMPARATIVE OXIDATION RATES (mm / year) (500 hour cyclic tests)

GRADE 1832 1922 2012 2102 2204 oFH H <0.1 0.22 0.92 3.9H K <0.1 0.22 0.95 3.5 12.7H T 0.20 0.54 1.4 3.2 7.2

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Page 2: HK-40

HEAT RESISTANT ALLOY HK40 Page 2

WELDABILITYHK40 alloy has good weldability by the SMAW, GTAW and GMAW processes using filler metal of matching composition.

CREEP-RUPTURE PROPERTIESLong term creep-rupture properties were extrapolated from Larson-Miller Parameter versus stress plots.

RUPTURE-STRESS-KSI

HOURS 1400 1500 1600 1700 1800 1900 oF

1,000. AVG. 11.9 8.75 6.18 4.34 3.05 2.09MIN. 9.39 6.97 4.98 3.48 2.35 1.54

10,000. AVG 8.75 6.04 4.10 2.67 1.74 1.05MIN 6.96 4.84 3.27 2.10 1.34 0.85

100,000 AVG. 6.11 4.12 2.58 1.59 0.96MIN. 4.84 3.20 2.06 1.28 0.78

CREEP-STRESS-KSI

%/HOUR 1400 1500 1600 1700 1800 1900 oF

0.01 AVG. - 11.8 9.9 8.0 6.35 4.750.001 AVG. 11.6 9.5 7.4 5.7 3.93 2.680.0001 AVG 9.0 6.85 5.0 3.35 2.05 1.05

Note: Creep and rupture stresses are subject to periodic revisions as the results from long term tests become available.

RELATED SPECIFICATIONSASTM: A 297 (HK); A 351(HK30 and HK40); A 567 (HK40 and HK50 - specification discontinued in 1987); A608 (HK30 and HK40)Nearest wrought grade: AISI 310. The composition of the wrought grade differs from that of the cast alloy and has different properties. The cast alloy designation should always be used to identify castings.

HEAD OFFICE, FOUNDRY & INTERNATIONAL SALESKubota Metal Corporation, Fahramet Division

25 Commerce Road, P.O. Box 1700,Orillia, Ontario, Canada, L3V 6L6.

Phone (705) 325-2781Fax (705) 325 5887


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