Project Description

Low Expansion Alloy

Alloy

4J32, 4J36, Nb-Invar

Similar Grade

GBTrademarkUNSDINW-Nr.ГОСТ
4J32––––32НКД
4J36InvarK93600Ni361.391236Н

Specification

YB/T5235-93, Q/SYY 7-1999, ГОСТ 10994-1974, ГОСТ 14080-78

Product Forms

Sheet, Strip, Plate, Round Bar, Flat Bar, Forgings, Hexagon, Wire

Chemical Composition, %

AlloyCMnSiPSNiCuCoFe
4J32≤0.050.2-0.6≤0.2≤0.02≤0.0231.5-33.00.4-0.83.2-4.2Rest
4J36≤0.050.2-0.6≤0.3≤0.02≤0.0235-37––Rest
Nb-Invar≤0.05≤0.6≤0.3≤0.02≤0.0230-35Nb≤0.53-5Rest
Average Linear Expansion Coefficient
AlloyHeat treatment for sampleAverage linear expansion coefficient a/10-6.K-1
20~100℃
4J32Heating to temperature between 840℃±10℃ in a protective or vacuum atmosphere. Holding for 1hour then water cooling. Machining the sample to the finial dimensions, reheating them to 315℃±10℃ holding for 1 hour, then furnace/air cooling–≤1.0–
4J36–≤1.5–
Nb-Invar≤0.5≤0.6≤0.5
Feature

Fairly low linear expansion coefficient at the temperature between -60℃ and 100℃.

Application

They are usually applied for making dimension stable components in various instruments.