Alloy X-750 Bolts

Alloy X-750 has good corrosion resistance and oxidation resistance below 980°C, high strength below 800°C, good relaxation resistance below 540°C, and good formability and welding performance. Excellent mechanical properties in low temperature environment.

 

Similar Grades

United States InconelX-750, UNS N07750

Germany W.Nr.2.4669, NiCr15Fe7TiAl

French NC15Tn

 

Chemical Composition

Composition	Mix	Max
C		0.08
Cr	14.0	17.0
Ni+Co	70.0
Al	0.4	1.0
Ti	2.25	2.75
Fe	5.0	9.0
Nb+Ta	0.7	1.2
Co		1.0
Si		0.5
Mn		1.0
P		0.015
S		0.010
Cu		0.5

 

Mechanical Properties (Room Temperature)

Variety	σЬ / MPa	σ0..2 / MPa	δ5 / %
Wire	1110	-	-
Stripe	≤930	-	≥18
Plate	≤930	≤515	≥30
Tube	≤965	≤550	≥35

 

Thermal Conductivity

Θ/℃	λ/(W/(m·℃)
50	14.7
100	15.9
300	20.1
500	25.1
900	37.3

 

Linear Expansion Coefficient

Θ/℃	α/10-6℃-1
20-200	13.1
20-300	13.5
20-400	14.1
20-500	14.4
20-600	15.0
20-700	15.6
20-800	16.2

 

Formability

1. The temperature range of thermal processing is 980-1200℃, and the cooling method can be water quenching or rapid air cooling;

2.The heating temperature of steel ingot forging can be 1200°C. In order to obtain good structure and properties of the final forging or bar, the subsequent forging heating temperature should be carried out at a correspondingly lower temperature. The final forging temperature should not be lower than 950°C. The alloy should be solution treated after the severe forming process.

 

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