OPTIM-AL | Paralloy Group | Paralloy Group

Application

Aluminium Forming For Fast Healing Properties.

OPTIM-AL is an aluminium containing alloy specifically
developed for pyrolysis furnace cracking coils, where high
oxidation and high carburisation resistance properties are
required to provide enhanced coil life.

OPTIM-AL has exceptional anti-coking properties which are
essential to maximise furnace run lengths, thereby enhancing
productivity improving furnace controls and producing better
ethylene yields.

OPTIM-AL is a material especially developed to form
a thin, dense homogeneous and continuous Aluminium Oxide
layer on the internal coil surface during service, which produces
exceptional anti-coking properties.

This is not only due to the Aluminium Oxide catalytic coking
properties, but also because Aluminium Oxide is pure and
totally free of catalytic elements such as Nickel and Iron.

Nominal Composition

6
C Carbon

0.26
24
Cr Chromium

26
28
Ni Nickel

43
43
Nb Niobium

0.8
22
Ti Titanium

0.10
13
Al Aluminium

4
Plus
Additions

Physical Properties

Coefficient of Thermal Expansion (mm/mm°C)	Thermal Conductivity (W/m°K)	Density (kg/m³)	Specific Heat (J/KgK)
20 – 100°C – 13.3 x 10⁻⁶	100°C – 10.7	7.55	480
20 – 800°C – 18.0 x 10⁻⁶	750°C – 30.4	7.28
20 – 1000°C – 19 x 10⁻⁶	1000°C – 34.3	7.18
20 – 1100°C – 19.5 x 10⁻⁶	1000°C – 35.9	7.13

Mechanical Properties

Download specifications

UTS (N/mm²) 550
Proof Stress 0.2% (N/mm²) 400
Elongation (%) 3

Temp (°C)	10,000 Hour Life		50,000 Hour Life		100,000 Hour Life
	Minimum	Mean	Minimum	Mean	Minimum	Mean
950	19.60	22.45	15.34	17.57	13.78	15.79
975	16.00	18.33	12.40	14.21	11.09	12.71
1000	13.01	14.91	9.98	11.44	8.89	10.19
1025	10.54	12.08	8.01	9.17	7.10	8.13
1050	8.51	9.74	6.39	7.33	5.64	6.47
1075	6.84	7.83	5.09	5.83	4.47	5.12
1100	5.47	6.27	4.03	4.62	3.52	4.04
1125	4.37	5.00	3.18	3.64	2.77	3.17

Download specifications

UTS (N/mm²)	550
Proof Stress 0.2% (N/mm²)	400
Elongation (%)	3

Temperature (°C)	UTS (N/mm²)	0.2% (N/mm²)	Elongation (%)
800°C	300	225	8
1000°C	75	50	28

Temp (°C)	10,000 Hour Life		50,000 Hour Life		100,000 Hour Life
	Minimum	Mean	Minimum	Mean	Minimum	Mean
950	19.60	22.45	15.34	17.57	13.78	15.79
975	16.00	18.33	12.40	14.21	11.09	12.71
1000	13.01	14.91	9.98	11.44	8.89	10.19
1025	10.54	12.08	8.01	9.17	7.10	8.13
1050	8.51	9.74	6.39	7.33	5.64	6.47
1075	6.84	7.83	5.09	5.83	4.47	5.12
1100	5.47	6.27	4.03	4.62	3.52	4.04
1125	4.37	5.00	3.18	3.64	2.77	3.17