Rail Differential Heat Treatment by Means of Air According to TEC Technology
Guaranteed Rates of TEC-DTO-106 Unit
Advantages
This technology enables heat treatment of rails made not only from Eh76F steel but also from different other steel grades including hypereutectoid ones. This method allows setting the guaranteed heat treatment mode with required cooling rates at different stages providing optimization of overall cycle time of rail heat treatment.
Mechanical Properties of Rails After Heat Treatment
|
Strength
grade
|
Ultimate tensile
strength,
N/mm2
|
Yield stress,
N/mm2
|
Percent
elongation, %
|
Percent
reduction, %
|
Impact
strength
KCU, J/cm2
|
Rail
category
|
|
DTO370
|
1290
|
900
|
12,0
|
35,0
|
15
|
ИК
|
|
DTO350
|
1180
|
800
|
9,0
|
25,0
|
25*
|
НН, СС, ВС
|
* - НН rail impact strength is determined at a temperature of -60°С
Hardness of Heat Treated Rails According to GOST R 51685-2000 Draft
|
Hardness measurement point
|
Hardness of DT350, DTO350НН,
DTO350СС, DT350ВС rails
|
|
On head tread surface
|
352 - 401
|
|
At a depth of 10 mm from the head tread surface along the vertical axis of rail
|
Not less than 341
|
|
At a depth of 22 mm from the head tread surface along the vertical axis of rail
|
Not less than 321
|
|
At web
|
Maximum 341
|
|
At base
|
Maximum 363
|
