Jaway Stainless Steel

What is 4J36 invar alloy?

Jawaysteel co.,ltd specialized in 4J36 Invar alloy,now we introduce the Invar alloy as bellow, if any inquiry about Invar alloy,pls call +86-021-36360955 , Email:sale@jawaysteel.com


1.Definition of invar

Invar alloy---National standard called expansion alloy, is a kind of nickel and iron that contains 36% of nickel,63.8% of iron and 0.2% of carbon, its low thermal expansion coefficient, can keep fixed length in wide temperature range.


2.Basic properties

Invar alloy belongs to high nickel alloy base on iron, usually containing 32% - 36% Ni, also contains small elements of S, P, C and others, the rest of 60% Fe.so invar alloy has the following properties:

a.Small expansion coefficient

b.Strength, hardness is not high

c.Low thermal conductivity

d.High plasticity and toughness


3.physical characteristics

The majority of metals or gold are both in expands when heated , but due to the ferromagnetic of invar alloy, its expansion coefficient is extremely low in a certain temperature range, sometimes even to zero or negative.


4.chemical characteristics

This alloy in magnetic temperature near the Curie point significantly reduce the thermal expansion coefficient, the so-called abnormal thermal expansion occurs abnormal (negative), which can be obtained the coefficient of expansion of very small or close to zeroa in wide range of temperatures near room temperature, the composition of this alloy is 64% of Fe and 36% of Ni and appear face-centered cubic structure, its grade is 4j36.


5.Production application

Is mainly used to manufacture gauge, thermometer, range finder, clock and watch escapement, gauge block, the resonant cavity of microwave equipment, gravimeter components, thermal bimetal component materials, optical instrument parts, etc.