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303 MA chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of 303 MA

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UNS 303 MA

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This page is mainly introduced the 303 MA chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of 303 MA,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Steel, Corrosion-Resistant, Bars and Forgings 0.14S - 18Cr - 9.5Ni - 0.50Mo - 0.80Al (303MA) Free-Machining; Swaging or Upsetting Solution Heat Treated

Steel Garde:303 MA
Type:Stainless Steels
Country:USA
Standard:UNS

Standard Number:

ITEM	Standard Number	Descriptions
1	SAE AMS 5638G (2010)	Steel, Corrosion-Resistant, Bars and Forgings 0.14S - 18Cr - 9.5Ni - 0.50Mo - 0.80Al (303MA) Free-Machining; Swaging or Upsetting Solution Heat Treated
2	SAE J 405 (1998)	Chemical compositions of SAE wrought stainless steels

Metallographic Structure:Austenite
Application:Steel, Corrosion-Resistant, Bars and Forgings 0.14S - 18Cr - 9.5Ni - 0.50Mo - 0.80Al (303MA) Free-Machining; Swaging or Upsetting Solution Heat Treated

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
303 MA	ASTM	USA
A 959 Type XM-2	SAE	USA
A 581 S30345	SAE	USA
A 582 S30345	SAE	USA
S30345	AISI	USA

Chemical composition(mass fraction)(wt.%)

Elements	Min.（≥）	Max.（≤）
C		0.15
Si		1.00
Mn		2.00
P		0.05
S	0.11	0.16
Cr	17.0	19.0
Ni	8.00	10.0
Mo	0.40	0.60
Al	0.60	1.00

Mechanical Properties

Tensile strength	162～486	σb/MPa
Yield Strength	892	σ 0.2 ≥/MPa
Elongation	34	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	806～419	-
HRC	30	-

Physical Properties

Thermal expansion	83-48	e-6/K
Thermal conductivity	60-68	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	0671-0420	째C
Density	4156-1905	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)
303 MA 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