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Brief introduction
4J40 belongs to Fe-Ni-Co ternary alloy, and the Curie point is 300℃ above.
It haslow expansion coefficient in -20℃ to 300℃ temperature range, and does not undergo transformation of austenite (γ) → martensite (M) up to -60℃.
Mainly used to manufacture instrument parts and electronic components that require high precision in -50℃ to 300℃.
Chemical composition under YB/T5241-2005 standard:
Grade chemical composition,% C P S Si Mn Ni Co Fe MAX 4J40 0.05 0.02 0.02 0.15 0.25 32.4~33.4 7.0~8.0 Remainder Remarks：If require adjustments for some chemical compositions, pls consult with us.
Typical average linear expansion coefficient value α,10-6/℃
Grade 20℃~50℃ 20℃~100℃ 20℃~200℃ 20℃~300℃ 20℃~400℃ 20℃~500℃ 4J40 1.4 1.3 1.2 1.7 4.5 - Main product types:
wire,rod, bar,strip, tube.
