Fechroma®15

GENERAL INFORMATION

Fechroma®15 – it is the ferritic chrome-plated steel on the basis of iron, alloyed with rare-earth metals and which containes aluminum.

Alloy has high thermal stability due to high content of aluminum and chrome in combination with rare-earth metals.

Main characteristics of Fechroma®15:

- good isometric and cyclic resistance to oxidizing processes;

- good heat resistance.

PROCESSING AND THERMAL PROCESSING

Fechroma®15 can be easily processed by usual industrial technologies. The processed products have to be both cleaned and not contain any impurity before and during heat treatment.

Sulfur, phosphorus, lead and others, metals with a low temperature of melting at heat treatment of Fechroma®15 can cause damages. Marking and thermometric paints and pencils, lubricants, liquids and combustible materials can be a source of similar impurity. Fuel has to contain as little sulfur as possible. Natural gas has to contain no more than 0,1% of sulfur mass, and content of sulfur in liquid fuel has to be not higher than 0,5% on weight.

Carrying out heat treatment in electric furnaces is recommended (in a vacuum or inert gas) since in this case it is possible to provide exact control of parameters of temperature and to guarantee lack of impurity.

Gas furnaces are also acceptable, on condition of the low content of impurity and establishment of neutral atmosphere of furnace or slightly oxidizing. It is necessary to avoid fluctuation of the atmosphere of the furnace between oxidizing and recovery, and also to avoid direct impact of flame on metal.

HOT DEFORMATION

Fechroma®15 has to be hot deformed in the range of temperatures 1050-850оС (1920-1560оF) with the subsequent cooling in water or on air, and passing of a temperature interval 560-400оС (1040-750оF) has to be carried out fast.

The thermal bend is carried out preferably at a temperature of 200-300°C. It is necessary to avoid the top temperature of 400°C-750°C (390-570°F).

COLD DEFORMATION

 

At essential deformations intermediate annealings are necessary.

After cold deformation by reduction at the level of 30% of product it is demanded to repeat softening annealing.

Classification

DIN

1.4767 (CrAl20 5)

UNS

К 92400*

Chemical composition, %

Cr

Fe

Al

C

14.0-16.0

rest

4.5-5.5

≤0.05

Mn

Si

Ni

S

≤0.50

≤0.50

0.30

≤0.015

Mechanical properties at 20°С

Diameter, mm

Elongation, %, not less

Tensile strength, MPa

0,12 – 0,5

18

637-784

0,5 – 1,00

18

1,0 – 12,0

25

PHYSICAL PROPERTIES

Temperature, оС

Resistance μΩm

Exten. 10-6

20

1,35

-

200

1,36

11,0

400

1,37

12,0

500

1,39

-

600

1,40

13,0

800

1,42

14,0

1000

1,44

15,0

1200

1,44

-