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A 540 Grade B21 Class 4 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of A 540 Grade B21 Class 4

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SAE A 540 Grade B21 Class 4

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A 540 Grade B21 Class 4 Profile
A 540 Grade B21 Class 4 Chemical composition
A 540 Grade B21 Class 4 Mechanical Properties
A 540 Grade B21 Class 4 Physical Properties
A 540 Grade B21 Class 4 Heat treatment
A 540 Grade B21 Class 4 Size Availability
A 540 Grade B21 Class 4 Relevant products

Profile

This page is mainly introduced the A 540 Grade B21 Class 4 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of A 540 Grade B21 Class 4,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Alloy-Steel Bolting Materials for Special Applications

Steel Garde:A 540 Grade B21 Class 4
Type:Stainless Steels
Country:USA
Standard:SAE
Standard Number:

ITEM Standard Number Descriptions

1 A 540/A 540M (2011) Alloy-Steel Bolting Materials for Special Applications
Metallographic Structure:Precipitation-Hardening
Application:Alloy-Steel Bolting Materials for Special Applications

ITEM	Standard Number	Descriptions
1	A 540/A 540M (2011)	Alloy-Steel Bolting Materials for Special Applications

Cross Reference Table(Equivalent Materials):

Material	Standard	Country
XM-31	UNS	USA
S21400	AISI	USA
S21460	AISI	USA
A 240 S21400	SAE	USA
A 580 S21400	SAE	USA
S21400	AISI	USA
SA-240 S21400	AMS	USA
21-4N	UNS	USA
21-4N + Nb + W	UNS	USA
A 214	SAE	USA
A 240 S21400	SAE	USA
A 580 S21400	SAE	USA
A 666 S21460	SAE	USA
A 691 Grade 2 1/4 CR	SAE	USA
A 732 Grade 14Q	SAE	USA
A92214	AISI	USA
B 823 CZP-3002-14	SAE	USA
B 862 Grade 14	SAE	USA
F2146 R56320	SAE	USA
G10214	AISI	USA
G12144	AISI	USA
G41214	AISI	USA
Grade 2 Class 1 Type 4	UNS	USA

Chemical composition(mass fraction)(wt.%)

Elements	Min.（≥）	Max.（≤）
C		0.05
Si		0.20
Mn		0.50
P
S
Ni		remaining
Cr	15.00	17.00
Al	4.00	5.00
Cu
Ti		0.50
Fe	2.00	4.00
N
Mo		0.50
B		0.006
Zr		0.05

Mechanical Properties

Tensile strength	096～106	σb/MPa
Yield Strength	847	σ 0.2 ≥/MPa
Elongation	13	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	711～359	-
HRC	30	-

Physical Properties

Thermal expansion	42-68	e-6/K
Thermal conductivity	70-13	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	7752-3864	째C
Density	5858-1785	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 540 Grade B21 Class 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