4J40|Kaixin Alloy Materials Co., Ltd.-specializes in high-temperature alloys-corrosion-resistant alloys-expansion alloys-pure nickel alloys and other strips-wires-rods

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Danyang Kaixin Alloy Material Co., Ltd.

4J40

Product properties:

Brand: KX-Alloy

Similar grades：Alloy 40、4J40

Certification certificate：ISO9001:2015

Place of Origin: Danyang, Jiangsu, China

Product Description

Alloy Category：Expansion alloy

Substrate shape: wire/strip/rod/pipe/plate

Alloy series: perminvar

Implementation standards：ASTM1684

Application fields: Industrial field, medical field, telecommunication

Product description and application

4J40 belongs to Fe-Ni-Co ternary alloy with Curie point above 300℃. The alloy has a low expansion coefficient in the temperature range of -20 ~ 300℃, until the temperature of -60℃, no austenite (γ)→ martensite (M) transformation occurs. The alloy is mainly used in the manufacture of highly precise instrument parts and electronic devices requiring sizes in the temperature range of -50 to 300 ° C.

4J40Composition content

Fe：58.11%~60.11%

Ni：32.4%~33.4%

Co：7.0%~8.0%

Mn≤0.25%

Si≤0.15%

C≤0.05%

P≤0.02%

S≤0.02%

Vacuum induction furnace

Electroslag remelting

Product physical properties

Density

ρ=8.2 g/cm³

Melting temperature

1430-1450 ℃

Mechanical properties

Product line expansion coefficient:

Alloy designation	Sample heat treatment regime	Average linear expansion coefficient α/(10^-6/ K）

		20～ 300 ℃
4J40	The semi-finished sample was heated to 840±10°C, held for 1h, water quenched, and then processed into finished sample. Hold at 315±10℃ for 1h with furnace cooling or air cooling	≤2.0

Typical expansion coefficient:

Alloy designation	Average linear expansion coefficient α(10^-6/ K）
	Average linear expansion coefficient α(10^-6/ K）
	20～ 50 ℃	20～ 100 ℃	20~200 ℃	20～300℃	20～400℃
4J40	14	1	1.2	1.7	4.5

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Product form

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Application scenario

Telecommunications