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Grade21 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of Grade21

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AISI Grade21

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This page is mainly introduced the Grade21 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of Grade21,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Grade21

Steel Garde:Grade21
Type:Special Alloy
Country:USA
Standard:AISI
Application:

Chemical composition(mass fraction)(wt.%)

Mechanical Properties

Tensile strength	501～406	σb/MPa
Yield Strength	723	σ 0.2 ≥/MPa
Elongation	62	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	228～533	-
HRC	30	-

Physical Properties

Thermal expansion	59-82	e-6/K
Thermal conductivity	47-59	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	7689-4088	째C
Density	2859-6251	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)
Grade21 Special Alloy	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