E50    
  Steels with Alusi® aluminium-silicon coating   Last update: 2011-6-10

The presence of silicon allows the coating to be used at very high temperatures, making it ideal for all applications where parts are subjected to heat.

 

Properties
   

Alusi® is a flat carbon steel product coated on both sides with an aluminium-silicon alloy. The coating is composed of 90% aluminium and 10% silicon and is applied by means of a continuous hot dip galvanising process. Alusi® is available in a wide range of steel grades: steels for cold forming and deep drawing applications, and structural steels. 

 

Advantages
   

Alusi® is particularly suitable for applications requiring high resistance to oxidation at high temperatures. Up to 450C, the top surface of the Alusi® coating does not alter and its thermal and light reflectivity remains at 80%, which is an important requirement for thermal shielding applications. The presence of silicon allows the coating to be used at temperatures as high as 650C without flaking.

 

A passivating layer of aluminium oxide is formed instantly in contact with the oxygen present in air. Since this passivation protection renews itself naturally when damaged (scratches), the coating offers excellent resistance to corrosion and chemical attack.

 

Applications
   

Because Alusi® can resist high temperatures, it is particularly suitable for use in thermal shielding. However, Alusi® also has many other applications:

  • General industry: exhaust systems, thermal shields, heating equipment, boilers, ducts, fume exhaust pipes, heat exchangers, industrial ovens etc 
  • Building: fire doors etc
  • Domestic appliances: ovens, deep fryers, toasters, barbecues etc

 

Alusi® can be supplied oiled and/or with a chemical surface treatment, or with an Easyfilm® thin organic coating (please see data sheet E80 for the specific properties of Easyfilm®).   

 

Alusi® is also suitable for enamelling, under certain conditions. For further information, see data sheet C40.

 

Under certain conditions, Alusi® is suitable for food contact, as specified in European directive 89/109/EEC and French standard NF A 36-712-2. Please contact us for further information on this subject.

 

Recommendations for use
   

Alusi® must be transported and stored in a sheltered, moisture-free environment.

 

The forming and joining techniques currently used for uncoated steel are also suitable for Alusi®.

Alusi® coated steel can be welded using various types of resistance welding processes (spot, seam, butt welding). TIG, MIG and MAG are also suitable.
When supplied oiled, Alusi® needs degreasing and surface treatment before painting.

 

Alusi® coated with an Easyfilm® thin organic coating can be painted directly, without any prior surface treatment. However, the paint must be compatible with the Easyfilm® resin.

 

Brand correspondence
   
 
Steels for cold forming and deep drawing applications
 NFA 36-340ASTM A463JIS 3314EN 10154:2002EN 10292:2007EN 10326:2004EN 10327:2004EN 10346:2009Old brand names
DX51D +AS EN 10346AS C / AS TCCSSA 1 CDX51D+AS  DX51D+ASDX51D+ASAL2/BM/BO
DX52D +AS EN 10346AS EFS DX52D+AS  DX52D+ASDX52D+ASAL3/BS
DX53D +AS EN 10346AS ESDDSSA 1 DDX53D+AS  DX53D+ASDX53D+AS(AL4)/BSR
DX54D +AS EN 10346AS EXEDDSSA 1 EDX54D+AS  DX54D+ASDX54D+ASAL5/BX
DX55D +AS EN 10346   DX55D+AS  DX55D+ASDX55D+ASALT/BHT
DX56D +AS EN 10346   DX56D+AS  DX56D+ASDX56D+ASAL6/BXS
 
Structural steels
 NFA 36-340ASTM A463JIS 3314EN 10154:2002EN 10292:2007EN 10326:2004EN 10327:2004EN 10346:2009Old brand names
S250GD +AS EN 10346C250SS Grade 37 S250GD+AS S250GD+AS S250GD+ASAL250
S280GD +AS EN 10346C280SS Grade 40 S280GD+AS S280GD+AS S280GD+ASAL280/BJ
S320GD +AS EN 10346C320  S320GD+AS S320GD+AS S320GD+ASAL320/BK
S350GD +AS EN 10346C350SS Grade 50 S350GD+AS S350GD+AS S350GD+ASAL350/BL
 
High strength low alloy steels
 NFA 36-340ASTM A463JIS 3314EN 10154:2002EN 10292:2007EN 10326:2004EN 10327:2004EN 10346:2009Old brand names
HX260LAD +AS EN 10346    HX260LAD+AS  HX260LAD+ASAL250NB
HX300LAD +AS EN 10346    HX300LAD+AS  HX300LAD+ASAL280NB
HX340LAD +AS EN 10346    HX340LAD+AS  HX340LAD+ASAL320NB
HX380LAD +AS EN 10346    HX380LAD+AS  HX380LAD+ASAL380
HX420LAD +AS EN 10346    HX420LAD+AS  HX420LAD+ASAL420
() Closest grade as no fully equivalent grade exists.


 

Dimensions
    Steels for cold forming and deep drawing applications
Thickness (mm)DX51D +AS EN 10346, DX52D +AS EN 10346DX53D +AS EN 10346DX54D +AS EN 10346DX55D +AS EN 10346DX56D +AS EN 10346
Min widthMax widthMin widthMax widthMin widthMax widthMin widthMax widthMin widthMax width
0.30 ≤ th < 0.4075011507501150750115075011507501150
0.40 ≤ th < 0.5012501250125012501250
0.50 ≤ th < 0.5513001300130014101300
0.55 ≤ th < 0.60150014001400
0.60 ≤ th < 0.701525152515251525
0.70 ≤ th < 2.001500
2.00 ≤ th < 2.501000600750
2.50 ≤ th < 2.65122012201240--
2.65 ≤ th < 3.0012001200

Structural steels
Thickness (mm)Min widthS250GD +AS EN 10346, S280GD +AS EN 10346S320GD +AS EN 10346, S350GD +AS EN 10346
Max widthMax width
0.30 ≤ th < 0.358001150-
0.35 ≤ th < 0.4512401240
0.45 ≤ th < 0.5513001300
0.55 ≤ th < 0.6014901490
0.60 ≤ th < 1.00
1.00 ≤ th < 1.601520
1.60 ≤ th < 2.001500
2.00 ≤ th < 2.501000-

High strength low alloy steels
Thickness (mm)Min widthHX260LAD +AS EN 10346, HX300LAD +AS EN 10346, HX340LAD +AS EN 10346, HX380LAD +AS EN 10346, HX420LAD +AS EN 10346
Max width
0.35 ≤ th < 0.458001240
0.45 ≤ th < 0.551300
0.55 ≤ th < 0.601490
0.60 ≤ th < 2.501520



 

Mechanical properties
   

 
Steels for cold forming and deep drawing applications
 
Direction
Thickness (mm)
Re (MPa)
Rm (MPa)
A80 (%)
r 90
n 90
DX51D +AS EN 10346T0.5 - 0.7-270 - 500≥ 20--
0.7 - 3≥ 22
DX52D +AS EN 10346T0.5 - 0.7140 - 300270 - 420≥ 24--
0.7 - 2.5≥ 26
DX53D +AS EN 10346T0.5 - 0.7140 - 260270 - 380≥ 28--
0.7 - 2.5≥ 30
DX54D +AS EN 10346T0.5 - 0.7120 - 220260 - 35032 - 50≥ 1.4≥ 0.180
0.7 - 2.534 - 50
DX55D +AS EN 10346T0.5 - 0.7140 - 240270 - 370≥ 30--
0.7 - 2.5≥ 32
DX56D +AS EN 10346T0.5 - 0.7120 - 180260 - 350≥ 37≥ 1.7≥ 0.200
0.7 - 2.5≥ 39
 
Structural steels
 
Direction
Thickness (mm)
Re (MPa)
Rm (MPa)
A80 (%)
r 90
n 90
S250GD +AS EN 10346L0.5 - 0.7≥ 250≥ 330≥ 17--
0.7 - 3≥ 19
S280GD +AS EN 10346L0.5 - 0.7≥ 280≥ 360≥ 16--
0.7 - 3≥ 18
S320GD +AS EN 10346L0.5 - 0.7≥ 320≥ 390≥ 15--
0.7 - 3≥ 17
S350GD +AS EN 10346L0.5 - 0.7≥ 350≥ 420≥ 14--
0.7 - 3≥ 16
 
High strength low alloy steels
 
Direction
Thickness (mm)
Re (MPa)
Rm (MPa)
A80 (%)
r 90
n 90
HX260LAD +AS EN 10346T< 3260 - 320350 - 430≥ 24--
HX300LAD +AS EN 10346T< 3300 - 380380 - 480≥ 21--
HX340LAD +AS EN 10346T< 3340 - 420410 - 510≥ 19--
HX380LAD +AS EN 10346T< 3380 - 480440 - 560≥ 17--
HX420LAD +AS EN 10346T< 3420 - 520470 - 590≥ 15--


 

Chemical composition
   

 
Steels for cold forming and deep drawing applications
 
C (%)
Mn (%)
P (%)
S (%)
Si (%)
Al (%)
Nb (%)
Ti (%)
DX51D +AS EN 10346 ≤ 0.120 ≤ 0.60 ≤ 0.100 ≤ 0.045 ≤ 0.50 - - ≤ 0.300
DX52D +AS EN 10346 ≤ 0.120 ≤ 0.60 ≤ 0.100 ≤ 0.045 ≤ 0.50 - - ≤ 0.300
DX53D +AS EN 10346 ≤ 0.120 ≤ 0.60 ≤ 0.100 ≤ 0.045 ≤ 0.50 - - ≤ 0.300
DX54D +AS EN 10346 ≤ 0.120 ≤ 0.60 ≤ 0.100 ≤ 0.045 ≤ 0.50 - - ≤ 0.300
DX55D +AS EN 10346 ≤ 0.120 ≤ 0.60 ≤ 0.100 ≤ 0.045 ≤ 0.50 - - ≤ 0.300
DX56D +AS EN 10346 ≤ 0.120 ≤ 0.60 ≤ 0.100 ≤ 0.045 ≤ 0.50 - - ≤ 0.300
 
Structural steels
 
C (%)
Mn (%)
P (%)
S (%)
Si (%)
Al (%)
Nb (%)
Ti (%)
S250GD +AS EN 10346 ≤ 0.200 ≤ 1.70 ≤ 0.100 ≤ 0.045 ≤ 0.60 - - -
S280GD +AS EN 10346 ≤ 0.200 ≤ 1.70 ≤ 0.100 ≤ 0.045 ≤ 0.60 - - -
S320GD +AS EN 10346 ≤ 0.200 ≤ 1.70 ≤ 0.100 ≤ 0.045 ≤ 0.60 - - -
S350GD +AS EN 10346 ≤ 0.200 ≤ 1.70 ≤ 0.100 ≤ 0.045 ≤ 0.60 - - -
 
High strength low alloy steels
 
C (%)
Mn (%)
P (%)
S (%)
Si (%)
Al (%)
Nb (%)
Ti (%)
HX260LAD +AS EN 10346 ≤ 0.120 ≤ 0.60 ≤ 0.030 ≤ 0.025 ≤ 0.50 ≥ 0.015 ≤ 0.090 ≤ 0.150
HX300LAD +AS EN 10346 ≤ 0.110 ≤ 1.00 ≤ 0.030 ≤ 0.025 ≤ 0.50 ≥ 0.015 ≤ 0.090 ≤ 0.150
HX340LAD +AS EN 10346 ≤ 0.110 ≤ 1.00 ≤ 0.030 ≤ 0.025 ≤ 0.50 ≥ 0.015 ≤ 0.090 ≤ 0.150
HX380LAD +AS EN 10346 ≤ 0.110 ≤ 1.40 ≤ 0.030 ≤ 0.025 ≤ 0.50 ≥ 0.015 ≤ 0.090 ≤ 0.150
HX420LAD +AS EN 10346 ≤ 0.110 ≤ 1.40 ≤ 0.030 ≤ 0.025 ≤ 0.50 ≥ 0.015 ≤ 0.090 ≤ 0.150


 

Coating properties
   
Alusi®Coating weight - double sided (g/m)Coating thickness (m per side)
AS50508.5
AS606010
AS808013
AS10010017
AS12012020
AS15015025

For other coating thicknesses, please contact us.




   
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All details provided in the ArcelorMittal Flat Carbon Europe S.A. catalogue are for information purposes only. ArcelorMittal Flat Carbon Europe S.A. reserves the right to change its product range at any time without prior notice.