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A 646 Grade HP 9-4-20 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of A 646 Grade HP 9-4-20

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SAE A 646 Grade HP 9-4-20

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A 646 Grade HP 9-4-20 Profile
A 646 Grade HP 9-4-20 Chemical composition
A 646 Grade HP 9-4-20 Mechanical Properties
A 646 Grade HP 9-4-20 Physical Properties
A 646 Grade HP 9-4-20 Heat treatment
A 646 Grade HP 9-4-20 Size Availability
A 646 Grade HP 9-4-20 Relevant products

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This page is mainly introduced the A 646 Grade HP 9-4-20 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of A 646 Grade HP 9-4-20,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings

Steel Garde:A 646 Grade HP 9-4-20
Type:Stainless Steels
Country:USA
Standard:SAE
Standard Number:

ITEM Standard Number Descriptions

1 A 646/A 646M (2011) Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings
Metallographic Structure:Precipitation-Hardening
Application:Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings

ITEM	Standard Number	Descriptions
1	A 646/A 646M (2011)	Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
HP 9-4-20	ASTM	USA
HP 9-4-20	ASTM	USA
HP 9-4-20	UNS	USA
HP 9-4-20	AMS	USA
HP 9-4-25	ASTM	USA
HP 9-4-25	UNS	USA
A 646 Grade HP 9-4-30	SAE	USA
HP 9-4-30	ASTM	USA
HP 9-4-30	ASTM	USA
HP 9-4-30	UNS	USA
HP 9-4-30	UNS	USA

Chemical composition(mass fraction)(wt.%)

Elements	Min.（≥）	Max.（≤）
C	0.17	0.23
Si		0.10
Mn		0.20
Ni		0.65
Cr		0.40
Al	4.25	4.75
Cu
Ti
Fe
Mo		0.85
Co	8.50	9.50
V	0.06	0.12
P		0.01
S		0.01
W	0.90	1.10

Mechanical Properties

Tensile strength	570～671	σb/MPa
Yield Strength	152	σ 0.2 ≥/MPa
Elongation	54	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	573～854	-
HRC	30	-

Physical Properties

Thermal expansion	73-69	e-6/K
Thermal conductivity	57-40	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	8445-4994	째C
Density	0594-9318	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)
A 646 Grade HP 9-4-20 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