RWMA Class 4 - Copper Beryllium C17200 | ALCAVIL Technical Data Sheet

RWMA Class 4 - High-Strength Copper Beryllium

UNS C17200

RWMA CLASS 4

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

WARNING - Restricted Use

Class 4 is NOT for conventional spot welding electrodes.
Its low conductivity (22% IACS) generates excessive electrode heating in spot welding applications. Use only for:
- Mold inserts and tooling
- Flash/upset welding dies
- Structural components requiring maximum hardness
- Applications where heat transfer is NOT critical

Safety - High Beryllium Content

This alloy contains 1.8-2.0% Beryllium (the highest of RWMA alloys). Solid bars are safe to handle and store. Machining that generates fine particles requires specialized ventilation systems and PPE. Comply strictly with OSHA 1910.1024.

MINIMUM AWS J1.3 PROPERTIES - CLASS 4

Property	Minimum	Unit
Electrical Conductivity	22	% IACS
Hardness	33	HRC

Note: Hardness in HRC (Rockwell C) scale, not HRB

CHEMICAL COMPOSITION

Cu	Be	Co
Balance	1.8 - 2.0%	≥0.2%

TYPICAL PHYSICAL PROPERTIES

Property	Typical Value	Unit
Electrical Conductivity (typical)	22 - 25	% IACS
Hardness (typical, aged)	36 - 42	HRC
Thermal Conductivity	105 - 115	W/m-K
Density	8.36	g/cm3
Softening Temperature	650	C
Tensile Strength	1100 - 1400	MPa
Melting Point	1000	C

RECOMMENDED APPLICATIONS

Plastic injection mold inserts
High-load welding dies
Flash welding fixtures
Structural welding machine components
High wear resistance tooling

KEY FEATURES

Hardness comparable to hardened steel
Exceptional tensile strength (1400 MPa)
Excellent fatigue resistance
High softening temperature
Retains hardness up to 650C

EQUIVALENT DESIGNATIONS

RWMA Class 4 UNS C17200 CuBe2 Alloy 25 High-Strength BeCu