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SA-268 25-4-4 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of SA-268 25-4-4

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AMS SA-268 25-4-4

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This page is mainly introduced the SA-268 25-4-4 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of SA-268 25-4-4,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service

Steel Garde:SA-268 25-4-4
Type:Stainless Steels
Country:USA
Standard:AMS

Standard Number:

ITEM	Standard Number	Descriptions
1	SA-268/SA-268M	Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service

Metallographic Structure:Precipitation-Hardening
Application:Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
A 176 S44635	SAE	USA
A 240 S44635	SAE	USA
A 268 S44635	SAE	USA
S44635	AISI	USA
SA-240 S44635	AMS	USA
SA-268 S44635	AMS	USA
A 268 25-4-4	SAE	USA
A 791 Grade 25-4-4	SAE	USA
A 803 Grade 25-4-4	SAE	USA
A 959 Type 25-4-4	SAE	USA
K42544	AISI	USA
SA-240 Type 25-4-4	AMS	USA
SA-803 25-4-4	AMS	USA

Chemical composition(mass fraction)(wt.%)

Elements	Min.（≥）	Max.（≤）
C		0.025
Si		0.75
Mn		1.00
P		0.04
S		0.04
Ni	3.35	4.50
Cr	24.50	26.00
Al
Cu		0.50
Ti
Fe
N		0.035
Mo	3.50	4.50

Mechanical Properties

Tensile strength	645～172	σb/MPa
Yield Strength	641	σ 0.2 ≥/MPa
Elongation	35	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	139～291	-
HRC	30	-

Physical Properties

Thermal expansion	59-76	e-6/K
Thermal conductivity	00-56	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	8152-3170	째C
Density	4367-1717	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)
SA-268 25-4-4 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