XTC | Paralloy Group | Paralloy Group

45/50 Cr/Ni 0.4% C

Chromium Corrosion Strengthening

Application

45/45 Alloy For Delayed Carburization

XTC is a nickel-based alloy developed to face coke formation and carburization issues encountered within steam-crackers for ethylene production. Its high temperature corrosion resistance, and its oxidation and mechanical properties, are the result of its high chromium content.

With its 40% chromium content, XTC develops a uniform and auto-protective oxide layer of chromia, with high thermal stability suitable for steam crackers service conditions. Additional elements have been finely tuned to further improve the oxidation, carburization and coking resistance of the alloy. The mechanical properties of this alloy, including creep resistance, have been carefully optimised.

Nominal Composition

6
C Carbon

0.4
24
Cr Chromium

45
26
Fe Iron

Balance
28
Ni Nickel

50
Plus
Additions

Phyiscal Properties

Coefficient of Thermal Expansion (mm/mm°C)	Thermal Conductivity (W/m°K)	Density (kg/m³)	Young Modulus (N/mm²x10³)	Specific Heat (J/KgK)
20 - 100°C - 13.9 x 10⁶	100°C - 13.8	7.97 x 10³	20°C - 176.5	480
20 - 800°C - 16.5 x 10⁶	800°C - 25.9		800°C - 127.2
20 - 1000°C - 17.8 x 10⁶	1000°C - 28.3		1000°C - 109.1

Coefficient of Thermal Expansion (mm/mm°C)

Thermal Conductivity (W/m°K)

Density (kg/m³)

Young Modulus (N/mm²x10³)

Specific Heat

(J/KgK)

20 - 100°C - 13.9 x 10⁶

100°C - 13.8

7.97 x 10³

20°C - 176.5

480

20 - 800°C - 16.5 x 10⁶

800°C - 25.9

800°C - 127.2

20 - 1000°C - 17.8 x 10⁶

1000°C - 28.3

1000°C - 109.1

Mechanical Properties

Download specifications

UTS (N/mm²) 470
Proof Stress 0.2% (N/mm²) 270
Elongation (%) 5

Temp (°C)	10,000 Hour Life		50,000 Hour Life		100,000 Hour Life
	Minimum	Mean	Minimum	Mean	Minimum	Mean
800	33.5	41.9	30.5	38.2	29.1	36.4
850	28.6	35.7	24.8	31.0	23.2	29.0
900	22.8	28.5	18.9	23.6	17.2	21.5
950	17.1	21.4	13.4	16.7	11.9	14.9
975	14.5	18.1	11.0	13.7	9.6	12.0
1000	12.0	15.0	8.8	11.1	7.7	9.6
1025	9.8	12.3	7.0	8.8	6.0	7.5
1050	7.9	9.9	5.5	6.8	4.6	5.8

Download specifications

UTS (N/mm²)	470
Proof Stress 0.2% (N/mm²)	270
Elongation (%)	5

Temperature	UTS (N/mm²)	Proof Stress 0.2% (N/mm²)	Elongation (%)
800°C	292	134	28
850°C	226	106	30

Temp (°C)	10,000 Hour Life		50,000 Hour Life		100,000 Hour Life
	Minimum	Mean	Minimum	Mean	Minimum	Mean
800	33.5	41.9	30.5	38.2	29.1	36.4
850	28.6	35.7	24.8	31.0	23.2	29.0
900	22.8	28.5	18.9	23.6	17.2	21.5
950	17.1	21.4	13.4	16.7	11.9	14.9
975	14.5	18.1	11.0	13.7	9.6	12.0
1000	12.0	15.0	8.8	11.1	7.7	9.6
1025	9.8	12.3	7.0	8.8	6.0	7.5
1050	7.9	9.9	5.5	6.8	4.6	5.8