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A 646 Grade 300M chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of A 646 Grade 300M

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SAE A 646 Grade 300M

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This page is mainly introduced the A 646 Grade 300M chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of A 646 Grade 300M,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 300M
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
300M	UNS	USA
Grade 1300 M	UNS	USA

Chemical composition(mass fraction)(wt.%)

Elements	Min.（≥）	Max.（≤）	Similar	Remarks
C		0.40
Si		1.60
Mn		0.75
P
S
Ni		0.40
Cr		1.85
Al
Cu
Ti
Fe		remaining
N
Mo
V		0.08

Mechanical Properties

Tensile strength	525～290	σb/MPa
Yield Strength	595	σ 0.2 ≥/MPa
Elongation	28	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	888～674	-
HRC	30	-

Physical Properties

Thermal expansion	40-36	e-6/K
Thermal conductivity	41-29	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	5977-7096	째C
Density	0112-6461	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 300M 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