RWMA Class 2 - Copper Chromium C18200 | ALCAVIL Technical Data Sheet

RWMA Class 2 - Copper Chromium (CuCr)

UNS C18200

RWMA CLASS 2

Ref: AWS J1.3/J1.3M:2020 - Specification for Materials Used in Resistance Welding Electrodes and Related Equipment

MINIMUM AWS J1.3 PROPERTIES - CLASS 2

Property	Minimum	Unit
Electrical Conductivity	75	% IACS
Hardness	75	HRB

CHEMICAL COMPOSITION

Cu	Cr
Balance	0.6 - 1.2%

TYPICAL PHYSICAL PROPERTIES

Property	Typical Value	Unit
Electrical Conductivity (typical)	80 - 85	% IACS
Hardness (typical, aged)	75 - 82	HRB
Thermal Conductivity	324	W/m-K
Density	8.89	g/cm3
Softening Temperature	475 - 500	C
Tensile Strength	310 - 480	MPa
Melting Point	1075	C

RECOMMENDED APPLICATIONS

Low carbon steel welding
Galvanized steels (general use)
High-volume automotive lines
Robotic spot welding
Shanks and adapters
Seam welding wheels

KEY FEATURES

Most widely used alloy (80% of applications)
Optimal conductivity/hardness balance
Excellent cost-benefit ratio
High resistance to thermal softening
Universal availability of shapes and sizes

EQUIVALENT DESIGNATIONS

RWMA Class 2 UNS C18200 CuCr Chromium Copper CDA 182 Tuffaloy C2 CMW 3

APPLICATION NOTE: Class 2 C18200 is the "workhorse" of the resistance welding industry. Its balance of conductivity (75% IACS min) and hardness (75 HRB min) makes it suitable for most spot welding applications on low and medium carbon steels. For high-strength steels (AHSS/UHSS), consider C18150 (CuCrZr) which offers better property retention at high temperatures.