4J32, 4J36, Nb-Invar

4J32, 4J36, Nb-Invarsnihw2020-04-05T16:37:02+08:00

Low Expansion Alloy

Alloy

4J32, 4J36, Nb-Invar

Similar Grade

GB	Trademark	UNS	DIN	W-Nr.	ГОСТ
4J32	–	–	–	–	32НКД
4J36	Invar	K93600	Ni36	1.3912	36Н

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, %

Alloy	C	Mn	Si	P	S	Ni	Cu	Co	Fe
4J32	≤0.05	0.2-0.6	≤0.2	≤0.02	≤0.02	31.5-33.0	0.4-0.8	3.2-4.2	Rest
4J36	≤0.05	0.2-0.6	≤0.3	≤0.02	≤0.02	35-37	–	–	Rest
Nb-Invar	≤0.05	≤0.6	≤0.3	≤0.02	≤0.02	30-35	Nb≤0.5	3-5	Rest

Average Linear Expansion Coefficient

Alloy	Heat treatment for sample	Average linear expansion coefficient a/10-6.K-1
Alloy	Heat treatment for sample	20~100℃
4J32	Heating 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.