Cobalt-based (Co) / Stellite* - DURUM wear protection

Cobalt-based alloys

Typical chemical composition* (in wt.-%) of pure weld metal

DUROLOY^®	C	Si	Mn	Cr	Ni	Mo	W	Co	Fe	+	Hardness	Applications	Features	Classification
DUROLIT 1	2,4	0,7	0,4	28	-	-	11,5	Rest	<4	-	55 HRC 600 °C: 44 HRC 800 °C: 34 HRC	Repair of forging dies.	Austenitic weld metal with large number of embedded carbides. Very hard, heat resistant, extremely abrasion resistant, corrosion resistant, especially against reducing acids and scale resistant up to approx. 1,000 °C.	DIN EN 14700: T Co3 / DIN 8555: MF 20-55-CGTZ
DUROLIT 6	1,1	1,2	0,7	29	-	-	4,5	Rest	<4	-	40-43 HRC 300 °C: 35 HRC 600 °C: 29 HRC	Steam valves, hot shear blades, high temperature liquid pumps, internal combustion engine valves such as marine diesel, etc.	Tough cobalt-based alloy of austenitic-ledeburitic structure with intercalated Cr and W carbides, machinable. Resists high abrasion and corrosive attack. Impact and thermal shock resistant.	DIN EN 14700: T Co2 / DIN 8555: MF 20-45-CTZ
DUROLIT 6 LC	0,9	1,2	0,7	29	-	-	4,5	Rest	<4	-	36-39 HRC	Steam valves, hot shear blades, high temperature liquid pumps, etc.	Austenitic weld metal with intercalated Cr and W carbides. Resists high abrasion, corrosive attack, hard knocks. Resistant to thermal shock. High toughness.	DIN EN 14700: T Co2 / DIN 8555: MF 20-40-CTZ
DUROLIT 6 HC	1,3	1,2	0,7	29	-	-	4,5	Rest	<4	-	43-46 HRC	Hot shear blades, steam valves, high temperature liquid pumps, etc.	Austenitic weld metal with intercalated Cr and W carbides. Resists high abrasion and corrosive attack. Impact and thermal shock resistant.	DIN EN 14700: T Co2 / DIN 8555: MF 20-45-CTZ
DUROLIT 12	1,4	1	0,8	29	-	-	8	Rest	<4	-	45-48 HRC 300 °C: 37 HRC 600 °C: 32 HRC	Machining tools of the hardwood, paper and plastics industries, as well as for crushing hammers, valve spindles and earth drills.	Weld metal of austenitic-ledeburitic structure with intercalated Cr and W carbides. Resists high abrasion and corrosive attack. Thermal shock resistant.	DIN EN 14700: T Co3 / DIN 8555: MF 20-50 CTZ
DUROLIT 21	0,25	1	0,8	28	2,5	5,5	-	Rest	<4	-	30 HRC Work hardened: 45 HRC	Steam fittings, acid fittings in chemical industry, outlet valves, hot stamping dies.	Tough cobalt-based alloy of austenitic structure. Toughest, most corrosion resistant and high-temperature resistant of the common cobalt hard alloys. Work hardening.	DIN EN 14700: T Co1 / DIN 8555: MF 20-350-CKTZ
DUROLIT 21 LC	0,2	1	0,8	28	2,5	5,5	-	Rest	<4	-	25-30 HRC/40 HRC*
DUROLIT 25	0,1	1	0,5	20	10	-	14,5	Rest	<4	-	250-280 HB	Pumps, chemical industry, hot shear blades, valves.	Weld metal of austenitic structure. Very good machinability. Resistant to corrosion, impact, wear as well as extreme thermal shocks.	DIN EN 14700: T Z Co1 / DIN 8555: MF 20-300-CKTZ
DUROLIT 712	1,8	0,5	0,5	29	<3	9	-	Rest	-	-	418 HRC	Conveyor and extrusion screws, rock bits, wear rings, impellers	Corrosion resistant in reducing acids High wear resistance	DIN EN 14700: T Z Co1 / DIN 8555: MF 20-300-CKTZ

*Stellite is a registered trademark of Kennametal Stellite Company

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