Physical Properties Group C (Class 20, 21, 22)

Group C Specialty Materials		Alloy Number	Rockwell Hardness		Electrical Conductivity		Yield Strength		Ultimate Tensile Strength		Elongation %
					%IACS [Ms/m]		0.2% Offset		Ksi [Mpa]
							Ksi [Mpa]
			Minimum		Minimum		Typical		Typical		IN 2" or 4 X D
Class 20		C15760	75 HRB		75% [43.5]		60 [413]		74 [510]		25
Class 21		C15715	62 HRB		92% [53]		48 [331]		58 [400]		30
Class 22		C15725	68 HRB		87% [50]		54 [332]		65 [448]		27

Notes:

Acceptance is based on hardness and conductivity only. 

Reference:

American Welding Society Publication J1.3