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Kovar chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of Kovar

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ASTM Kovar

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This page is mainly introduced the Kovar chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of Kovar,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Iron-Nickel-Cobalt Alloy, Sheet, Strip, and Plate, 53Fe - 29Ni - 17Co, Low Expansion Glass Sealing, Annealed

Steel Garde:Kovar
Type:Stainless Steels
Country:USA
Standard:ASTM

Standard Number:

ITEM	Standard Number	Descriptions
1	SAE AMS 7728H (2000)	Iron-Nickel-Cobalt Alloy, Sheet, Strip, and Plate, 53Fe - 29Ni - 17Co, Low Expansion Glass Sealing, Annealed

Metallographic Structure:Precipitation-Hardening
Application:Iron-Nickel-Cobalt Alloy, Sheet, Strip, and Plate, 53Fe - 29Ni - 17Co, Low Expansion Glass Sealing, Annealed

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
Kovar	ASTM	USA
Kovar	ASTM	USA
Kovar	UNS	USA
Kovar	UNS	USA
Kovar	UNS	USA
Kovar	UNS	USA
Kovar	UNS	USA

Chemical composition(mass fraction)(wt.%)

Elements	Min.（≥）	Max.（≤）	Similar	Remarks
C		0.04
Si		0.20
Mn		0.50
Ni		29.00
Cr		0.20
Al		0.10
Cu		0.20
Ti		0.10
Fe		53.00
Mo		0.20
Co		17.00
W
Mg		0.10
Zr		0.10

Mechanical Properties

Tensile strength	743～876	σb/MPa
Yield Strength	889	σ 0.2 ≥/MPa
Elongation	88	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	822～151	-
HRC	30	-

Physical Properties

Thermal expansion	87-76	e-6/K
Thermal conductivity	52-17	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	6788-1947	째C
Density	8218-0526	kg/m³
Resistivity	0.50-0.60	Ohm.mm²/m

Heat Treatment Regime

Annealing	Quenching	Tempering	Normalizing	Q & T
√	√	√	√	√

Size Availability

Steel Grade	Specification	Processing range(mm)
Kovar Stainless Steels	Round Bar and Hollow Bar	Φ1 to Φ2000
	Square and Flat Steel	Φ10 to Φ100
	Plate and Sheet	0.08-800(Thickness)10-1500(Width)Length
	Tube or Pipe	OD:Φ4-410; WT:1-35 mm; Lenght:10-12000
	Coil and Strip Steel	THK:0.1mm Width:1500mm
	Forged	Ring/Cylindrical/Disk