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Chromel, alumel and constantan contain unique material properties or characteristics that are necessary to ensuring the success of certain applications. However, these particular materials are incredibly difficult to work with, so there are few manufactures who have the expertise or ability to manufacture parts using these materials. But UALLOY does. 

Chromel: Chromel is an alloy of an estimated 90% nickel and 10% chromium. It is used on the fabrication of the positive conductors of ANSI Type E and Type K thermocouples, devices for measuring temperature consisting of two different conductors. 

This alloy can withstand a wide range of temperatures (-452ºC up to 1100ºC) in oxidizing environments. 

Alumel: This magnetic alloy consists of approximately nickel (95%), manganese (2%), aluminum (2%), and silicon (1%), leading to good electrical resistivity and thermal conductivity. In addition to thermocouples, alumel is used for thermocouples extension wire. In thermocouples, the alloy is uesd with chromel to fabricate type K thermocouples. 

Constantan: This alloy usually consists of 55% copper and 45% nickel. Its greatest advantage is a constant resistivity over a wide spectrum of temperatures. It is also used in the production of thermocouples, along with iron, chromel and alumel. 

Grade

Grade	Chemical Composition(%)
	Al	Cu	Si	Cr	Mg	Ni	Fe
KP	-	-	-	10	-	90	-
KN	-	-	-	3	-	97	-
KN	2	-	-	-	2	95	-
EP	-	-	-	10	-	90	-
EN	-	55	-	-	-	45	-
JP	-	-	-	-	-	-	100
JN	-	55	-	-	-	45	-
TP	-	100	-	-	-	-	-
TN	-	55	-	-	-	45	-
NP	-	-	1.4	14.2	-	84.4	-
NN	-	-	4.4	-	0.1	95.5	-