RWMA Class 14 - Molybdenum (Mo/TZM) | ALCAVIL Technical Data Sheet

RWMA Class 14 - Pure Molybdenum & TZM

UNS R03600

RWMA CLASS 14

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

MINIMUM AWS J1.3 PROPERTIES - CLASS 14

Property	Minimum	Unit
Electrical Conductivity	30	% IACS
Hardness	85	HRB

CHEMICAL COMPOSITION

Grade	Mo	Ti	Zr
Pure Mo	99.95%	-	-
TZM	Balance	0.5%	0.08%

PHYSICAL PROPERTIES - Pure Molybdenum vs TZM

Property	Pure Mo	TZM
Electrical Conductivity	≥30% IACS	≥30% IACS
Hardness	≥85 HRB	95-100 HRB
Density	10.22 g/cm3	10.16 g/cm3
Melting Point	2,623 C	2,623 C
Recrystallization Temp.	1,100 C	1,400 C
Thermal Conductivity	138 W/m-K	126 W/m-K

RECOMMENDED APPLICATIONS

Electrodes for molybdenum welding
Refractory inserts
High-temperature applications
EDM electrodes
Glass injection molds
Vacuum furnace components

TZM ADVANTAGES VS PURE MO

+300C higher recrystallization temperature
Higher hardness (+10-15 HRB)
Better high-temperature resistance
Longer life in thermal cycles
Ideal for intensive 24/7 production

EQUIVALENT DESIGNATIONS

RWMA Class 14 UNS R03600 (Mo) UNS R03630 (TZM) Molybdenum TZM Alloy Moly

APPLICATION NOTE: TZM (Titanium-Zirconium-Molybdenum) is the most advanced molybdenum alloy for resistance welding applications. The addition of Ti and Zr raises the recrystallization temperature from 1,100C to 1,400C, resulting in longer life under intensive thermal cycling. For moderate temperature applications, pure Mo is more economical and meets Class 14 requirements.