Closest Equivalent Alloy	IS 4522	Closest DIN 17445	ASTM - A297 Gr	C %	Ni %	Cr %	Mo %	Si %	Mn%	others %	Applications
-	-	-	HA	0.20 max	-	8.00 - 10.00	0.90 - 1.20	1.0 max	0.35 - 0.65	-	Good oxidation resistance upto 650oC. Used in oil refining industry.
HRCS 28/4	-	-	HC	0.50	4.0 max	26.0 - 30.0	0.5 max	2.0 max	1.0 max	-	Good sulphur and oxidation resistance upto 10950C. Minimal load bearing capacity.
HRCS 5/28	Grade 4	-	HD	0.5 max	4.0 - 7.0	26.0 - 30.0	0.5 max	2.0 max	1.5 max	-	Can be used in high sulphur application (avoid at 700o-800oC) upto 1000oC.
HRCS 9/29	Grade 6	-	HE	0.20 - 0.50	8.0 - 11.0	26.0 - 30.0	0.5 max	2.0 max	2.0 max	-	More ductile and higher corrosion resistance (avoid at 815oC) upto 1050oC for high S atmosphere.
HRCS 9/19	Grade 5	1.4825	HF	0.20 - 0.40	8.0 - 12.0	18.0 - 23.0	0.5 max	2.0 max	2.0 max	-	Suitable for applications requiring high strength & corrosion resistance at 6500C to 8700C.
HRCS 12/25	Grade 7	1.4837	HH	0.20 - 0.50	11.0 - 14.0	24.0 - 28.0	0.5 max	2.0 max	2.0 max	-	Suitable for applications between 9270C and 10930C. Not to be used from 7500C to 8900C and for operations invloving thermal shock & carburizing conditions.
HRCS 12/25	-	-	HH  Type2	0.20 - 0.50	11.0 - 15.0	22.0 - 24.0	0.5 max	1.75 max	2.5 max	-	Same as HH but with superior creep resistance and reduced ductility. Used from 650o C to 1000o C under constant temperature conditions.
HRCS 15/28	-	-	HI	0.20 - 0.50	14.0 - 18.0	26.0 - 30.0	0.5 max	2.0 max	2.0 max	-	Higher corrosion resistance and higher strength at temperature upto 1050oC (avoid 815oC).
HRCS 20/25	Grade 9	1.4848	HK	0.20 - 0.60	18.0 - 22.0	24.0 - 28.0	0.5 max	2.0 max	2.0 max	-	Suitable for stressed parts working upto 1100o C such as billet skids, heat treating trays & fixtures. Unsuited at 815o C and in operations involving thermal shocks.
HRCS 20/25	-	1.4848	HK40	0.35 - 0.45	19.0 - 22.0	23.0 - 27.0	0.5 max	1.75 max	1.5 max	-	Same as HK but with better creep strength.
AISI 314	-	-	-	0.25 max	19.0 - 22.0	23.0 - 26.0	-	1.5 - 3.0	2.0 max	-	Same as HK but Si increased for greater resistance to carburization.
HRCS HKNb	-	-	HK40 Nb	0.35	19.0 - 22.0	23.0 - 27.0	0.5 max	0.5 - 2.0	1.5 max	0.5 - 1.5 Nb	-
HRCS 24/24 Nb	-	1.4855	IN519	0.25 - 0.35	23.0 - 25.0	23.0 - 25.0	0.5 max	0.1 max	1.0 max	1.4 Nb	Same as HK 40 but with enhanced high temperature resistance upto 1025o C.
HRCS 29/20	Grade 10	-	HL	0.2 - 0.6	18.0 - 22.0	28.0 - 32.0	0.5 max	2.0 max	2.0 max	-	Higher corrosion resistance and higher strength at temperature upto 1100oC (avoid 815oC).
HRCS 25/20	Grade 11	-	HN	0.20 - 0.50	23.0 - 27.0	19.0 - 23.0	0.5 max	2.0 max	2.0 max	-	Suitable for applications upto 1100oC for furnace parts such as grates, etc. with increased ductility.
HRCS 32/20 Nb	-	1.4859	Castalloy  800H	0.10 - 0.15	30.0 - 33.0	19.0 - 21.0	0.5 max	1.5 max	1.5 max	0.8 - 1.0 Nb	Suitable for manifolds and headers. Service limit upto 980o C with increased ductility.
HRCS 35/25	-	-	HP	0.35 - 0.75	33.0 - 37.0	24.0 - 28.0	0.5 max	2.5 max	2.0 max	-	Resistant to both oxidizing and carburizing atmospheres at high temperatures upto 1050o C.
HRCS 35/25 Nb	-	1.4852	HP  modified	0.35 - 0.45	33.0 - 36.0	24.0 - 28.0	0.5 max	1.2 max	1.2 max	0.5 - 1.0 W, 0.8 - 1.2 Nb	Same as HP but with enhanced high temperature resistance upto 1100o C. Suitable for reformer ethylene furnace tubes, radiant tubes, etc.
HP-Mo	-	-	-	0.35 - 0.45	33.0 - 36.0	24.0 - 28.0	1.0 - 1.5	1.6 max	1.0 max	-	-
HRCS 35/15	Grade12	-	HT	0.35 - 0.75	33.0 - 37.0	15.0 - 19.0	0.5 max	2.5 max	2.0 max	-	Suitable for highly stressed parts upto 1095o C including for carburizing operations. High sulphur gases and thermal shocks are detrimental.
HRCS 39/19	Grade 13	-	HU	0.35 - 0.75	37.0 - 41.0	17.0 - 21.0	0.5 max	2.5 max	2.0 max	-	Suitable for applications upto 1095o C including for carburizing operations. Can withstand corrosive applications with rapid thermal cycles.
45/30 Nbw	-	-	-	0.40 max	42.0 - 46.0	32.0 - 36.0	-	1.0 max	1.0 max	0.5 W 0.5 Nb	Useful for components operating in hot zone of pyrolysis coils and components of Reformer outlet manifold service limit 1150o C
22H	-	2.4879	-	0.35 - 0.45	48.0 - 52.0	27.0 - 29.0	-	1.5 max	1.5 max	4.0 - 6.0 W	Same as HP but with enhanced high temperature resistance upto 1150o C. Suitable for radiant tubes, air injection tubes, reformer tubes and fittings for petrochemical furnaces, tube sheets, tube supports, etc.
Super 22H	-	-	-	0.40 - 0.50	46.0 - 50.0	27.0 - 29.0	-	2.0 max	1.5 max	4.0 - 6.0 W, 2.0 - 4.0 Co	Same as 22H but with enhanced high temperature resistance upto 1180o C.
HRCS 60/12	-	-	HW	0.35 - 0.75	58.0 - 62.0	10.0 - 14.0	0.5 max	2.5 max	2.0 max	-	Excellent thermal shock resistance and resistance to carburisation up to 1040o C where sulphur is not present.
HRCS 66/17	Grade 14	-	HX	0.35 - 0.75	64.0 - 68.0	15.0 - 19.0	0.5 max	2.5 max	2.0 max	-	For severe service applications upto 1150o C where corrosion resistance is required.
Canalloy	-	-	-	0.50 - 0.65	10.0 - 14.0	22.0 - 26.0	-	1.75 - 2.25	1.5 max	-	Bushes & sleeves for hot dip galvanizing line.
Canalloy Controlled Manganese	-	-		0.65 max	10.0 - 14.0	22.0 - 26.0	-	1.75 - 2.25	0.75 - 1.50	0.03 S max 0.03 P max	Bushes & sleeves for hot dip galvanizing line.
UMCO-50	-	-	-	0.05 - 0.12	-	27.0 - 29.0	-	0.5 - 1.0	0.5 - 1.0	48.0 - 52.0 Co, Bal Fe	Furnace parts in heat-treating furnaces, slag notch rings and tundishes.
Cobalt Alloy 6	-	R30006	-	0.90 - 1.40	3.0 max	28.0 - 32.0	1.5 max	2.0 max	2.0 smax	3.0 Fe max, 3.5 - 5.5 W, Bal Co	Wear plates and bars, bushes & sleeves for operation in hot & corrosive atmosphere, where lubrication is impossible, with superior performance. Similar to Stellite
Cobalt Alloy 12	-	R30012	-	1.70 - 2.00	1.5 max	27.0 - 32.0	-	0.7 max	2.5 max	7.5 - 9.5 W, 3.0 Fe max, Bal Co	Cutting tools and bushes & sleeves for operation in hot & corrosive atmosphere, where lubrication is impossible, with superior performance. Similar to Stellite
Cobalt Alloy Special	-	-	-	1.10 - 1.40	-	26.0 - 28.0	-	1.8 - 2.2	0.4 - 0.8	63.0 - 67.0 Co, 4.0 - 5.0 W, 2.0 Fe max	For better sliding wear property. Hardness is between 375 to 432 HRB. Similar to Stellite
40 Ni 60 CrNb	R20600	-	ASTM A560 Gr 40/60 Nb	0.10 max	Balance	58.0 - 62.0	-	1.0 max	0.3 max	0.02 P max, 0.02 S max, 0.3 N max, 1.0 Fe max, 0.5 Al max, 0.25 Nb max	-
50 Ni 50 CrNb	-	2.4680	ASTM A560 Gr 50/50 Nb	0.10 max	Balance	47.0 - 52.0	-	0.5 max	0.3 max	1.4 - 1.7 Nb, 0.02 P max, 0.02 S max, 1.0 Fe max	Suitable for applications upto 9500 C in furnace parts. Can withstand fuel ash corrosion. Good creep strength and good resistance to oxidation and carburization.
60 Ni 40 CrNb	-	-	ASTM A560 Gr 60/40 Nb	-	-	-	-	-	-	-	For heat resisting and elevated temperature corrosion resistance application such as tube hangers.
CY-40 (70Ni15Cr)	-	-	ASTM A494 Gr CY-40	0.35 - 0.45	Balance	14.0 - 17.0	-	3.0 max	1.5 max	11.0 Fe max	Frequently used for elevated temperature fittings in conjunction with Inconel. Suitable for boiler feed water plants and where high strength, high resistance to wear, corrosion and oxidation at elevated temperatures is required. Similar to Inconel