Stellite 1

Description

Stellite 1

 

Co	Cr	W	C	Others	Hardness	Density	Melting Range
Base	28 – 32	11-13	2.0-3.0	Ni, Fe, Si, Mn, Mo	50-58 HRC 550-720 HV	8.69 g/cm3 0.314 lb/in3	2175-2450 °F 1190-1345 °C

 

Stellite 1 is a hardfacing alloy possessing excellent abrasion and corrosion resistance for applications such as pump sleeves, rotary seal rings, wear pads, expeller screws and bearing sleeves. It retains its hardness at temperatures in excess of 760°C (1400°F).

Stellite 1 contains a high proportion of hard, wear resistant primary carbides. These render the alloy well suited to applications involving extreme low-angle erosion and severe abrasion, with some sacrifice in toughness. Compared to other Stellite® alloys it is more crack sensitive, and care should be taken to

Optical micrograph of a Stellite 1 weld overlay

 

minimize the cooling stresses experienced during casting and hardfacing processes. Due to its high hardness and wear resistance, Stellite® 1 should only be finished by grinding.

 

Corrosion Resistance

Stellite® 1 has good general corrosion resistance. The typical electrode potential in sea water at room temperature is approx. -0.4 V (SCE). Stellite® 1 corrodes primarily by a pitting mechanism and not by general mass loss in seawater and chloride solutions. More detailed information regarding corrosion resistance can be provided on request.

 

 

Nominal Thermal Expansion Coefficient (from 20°C/68°F to stated temperature)

	100°C (212°F)	200°C (392°F)	300°C (572°F)	400°C (752°F)	500°C (932°F)	600°C (1112°F)	700°C (1292°F)	800°C (1472°F)	900°C (1652°F)
µm/m.K	10.5	11.3	11.8	12.1	12.5	12.8	13.5	13.9	14.4
µ-inch/inch.°F	5.8	6.3	6.5	6.7	6.9	7.1	7.5	7.7	8.0

 

Nominal Tensile Properties at Room Temperature

	Ultimate Tensile Strength Rm		Yield Stress Rp(0.2%)		Elongation	Elastic Modulus
	ksi	MPa	ksi	MPa	A(%)	psi	GPa
Castings	79	550	–	–	<1	36.0×106	248
Stellite® HS-1 (*)	173	1195	152	1050	<1	33.4×106	230

(*) “HS” = HIP-consolidated from the powder form.

 

Nominal Hot Hardness (DPH) as-cast

20°C (68°F)	100°C (212°F)	200°C (392°F)	300°C (572°F)	400°C (752°F)	500°C (932°F)	600°C (1112°F)	700°C (1292°F)	800°C (1472°F)	900°C (1652°F)
606	573	540	508	485	453	406	330	217	140

 

Thermal and Electrical Properties

	Approximate value at Room Temperature
Thermal conductivity	14.5 W/m.K	100.5 Btu-in/hr/ft2/°F
Electrical resistivity	94.0 µ-ohm.cm	37.0 µ-ohm.inch

 

Product Forms and Cross Reference Specifications

Stellite® 1 is available as welding wire, rod, powder, and electrodes, finished castings and HIP consolidated blands or parts. Deloro Stellite also offers hard facing services.

Stellite® 1 can be supplied to the following specifications:

SPECIFICATION	PRODUCT FORM	SPECIFICATION	PRODUCT FORM
UNS R30001	Stellite® 1 Rod, castings, powder for PTA or laser processing	AWS A5.21 / ASME BPVC IIC SFA 5.21 ERCoCr-C	Stellite® 1 Rod
UNS R30001	Stellite® HS-1 (HIP-consolidated from powder)	AWS A5.21 / ASME BPVC IIC SFA 5.21 ERCCoCr-C	Stellite® 1 Wire
UNS W73031	Stellite® 1 Wire	AWS A5.13 / ASME BPVC IIC SFA 5.13 ECoCr- C	Stellite® 1 Electrode