WEAR RESISTANT FACTOR
In order to facilitate the appropriate selection of the quality anti rust and abrasion sheets, we develop this wear resistant formula.
To do this was taken as a basis the wear resistant that offer a conventional steel layer (ST 37), with hardness Hb and factor 20 (100 Hb / 5 = 20) and the full alloy sheet or special thermal offered with hardness of 500 HB that corresponds to 100 factor.
In the catalogue are included from the 35 (S355JR) factor to 100 factor of the tempered and annealing sheet (URSSA-500).
DESIGNATION OF STEEL ACCORDING TO:
The UNE EN 10027-1 rule establish the rules for the symbolical designation of the sheets by numeric symbols and letters that express certain mechanical, physical, application characteristics, necessaries to set an abbreviate designation of the sheets.
Designation of structural steels departing from its characteristics.
|
1st letter Type of steel |
nº Elastic limit |
2nd Resilience letter |
3rd |
Following letters |
Following letters Other characteristics |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
E |
Engineering |
Steel for mechanical constructions |
Indicate the minimum elastic limit warranted in N/mm2 |
J |
Res. de 27 Jul. |
R |
Res. 20º |
C |
Special cold reduction |
A |
Soft – |
Soft – |
|
L |
Pipe – Line |
Steel for pipelines |
K |
Res. de 40 Jul. |
0 |
Res. 0º |
M |
Thermomechanically rolled |
AR |
As Rolled |
As Rolled |
|
|
P |
Presure |
Steel for boilers |
L |
Res. de 60 Jul. |
2 |
Res. -20º |
N |
Normalized or controlled lamination |
N |
Normalized |
Normalized |
|
|
S |
Structural |
Structural steels |
3 |
Res. -30º |
Q |
Quenched and Tempered |
N+T |
Normalized and Tempered |
Normalized and Tempered | |||
|
4 |
Res. -40º |
L |
Quenched and Tempered |
Q |
Quenched |
Quenched |
||||||
|
5 |
Res. -50º |
H |
Resistance to high temperatures |
Q+T |
Quenched and Tempered |
Quenched and Tempered |
||||||
|
6 |
Res. -60º |
W |
Resistant to atmospherical corrosion |
T |
Tempered |
Tempered |
||||||
|
S |
Shipbuilding |
TM |
TermomechanicallyRolled |
Termomechanically Rolled |
||||||||
|
G |
Other characteristics |
TM+A |
TermomechanicallyRolled +accelerated-cooling |
Termomechanically Rolled +accelerated-cooling |
||||||||
The UNE EN 10027-2 rule establish the rules for the numerical designation of the steels. The same number may correspond to one type and degree steel, and for each degree and each type corresponds a unique number as the following example:
1. NN XX (XX)
1 indicate that is steel
NN is the number of the group of steel, according to each use.
XX (XX) is the order number (in parenthesis, future extension)
Carbon equivalent
One of the most important characteristic in the steel is the solderability, that can be evaluated through the carbon equivalent parameter.
Formulas for calculating the equivalent carbon:
Short formula:
| Ce = C + | Mn |
| 6 |