B20    
  High Strength Low Alloy steels   Last update: 2011-4-5

HSLA steels are particularly suitable for structural parts that do not require severe forming, such as industrial shelving systems or furniture.

 

Properties
   

These high strength steels are characterised by their low content of both carbon and micro-alloying elements. This gives HSLA steels outstanding functional properties, such as weldability and coatability. The hardening achieved by controlled internal purity and fine grain size structure ensures excellent mechanical strength. The grades available are in compliance with EN 10268:2006 and are obtained after either batch or continuous annealing.

 

Advantages
   

They combine improved weldability with good formability. The narrow variation margins for their mechanical properties make it easy to shape the steel (presses or automated lines). They also have good fatigue and impact resistance.

 

Applications
   

They are particularly suitable for structural parts that do not require severe forming (profiling, bending or light drawing): automotive structures and reinforcements, industrial shelving systems, furniture, mechanical engineering applications etc.

 

Formability
   

The deep drawing performance of the HC260LA AM FCE grade is equivalent to that of mild steel. Drawability decreases as the yield strength increases.

Forming limit curves can be used to define the maximum strains not to be exceeded when forming steel by various methods, so as to avoid the risk of incipient necking. These curves are available on request.

 

Please contact us for other forming data on HSLA products for particular sheet thicknesses.

 

Weldability
   

HSLA AM FCE steel grades have good weldability in all welding processes.

Based on many years’ practical experience in arc and resistance spot welding of its products, ArcelorMittal can provide valuable technical assistance in defining the welding parameters for all products in the HSLA range.

 

Fatigue resistance
   

Fatigue resistance is generally expressed as an endurance limit, corresponding to the maximum stress resisted for a given number of cycles before failure. The table below gives some examples of 5 million cycle endurance limits under fluctuating tension with a stress ratio Rs = 0.1.

 Thickness5 million cycle endurance limit (MPa)
HC300LA AM FCE1 mm362
HC380LA AM FCE0.8 mm403

A complete database of fatigue resistance data on this range of steels is available on request.

 

Brand correspondence
   
 EN 10268:2006EN 10268:1998ASTM 607:1993Old brand names
HC260LA EN 10268HC260LAH240LA  
HC260LA AM FCEHC260LAH240LA Profilar 260
HC300LA EN 10268HC300LAH280LA  
HC300LA AM FCEHC300LAH280LA Profilar 300/Sidca M-300/Soldur 280
HC340LA EN 10268HC340LAH320LA  
HC340LA AM FCEHC340LAH320LAGrade 607-45Profilar 340/Sidca M-340/Soldur 320
HC380LA EN 10268HC380LAH360LA  
HC380LA AM FCEHC380LAH360LAGrade 607-50Profilar 380/Soldur 360
HC420LA EN 10268HC420LAH400LA  
HC420LA AM FCEHC420LAH400LAGrade 607-55Profilar 420
HC460LA AM FCE    
Grades in italics: not included in the standard


 

Dimensions
   
Thickness (mm)HC260LA EN 10268, HC260LA AM FCEHC300LA EN 10268, HC300LA AM FCEHC340LA EN 10268, HC340LA AM FCEHC380LA EN 10268, HC380LA AM FCEHC420LA EN 10268, HC420LA AM FCEHC460LA AM FCE
Min widthMax widthMin widthMax widthMin widthMax widthMin widthMax widthMin widthMax widthMin widthMax width
0.30 ≤ th < 0.40600120060012006001210800-800-800-
0.40 ≤ th < 0.501360136013801030
0.50 ≤ th < 0.60154015401540127010101150
0.60 ≤ th < 0.70170016201620600134011101270
0.70 ≤ th < 0.80181016701670144060012201340
0.80 ≤ th < 0.9018601720157012901400
0.90 ≤ th < 1.0018201820165013501450
1.00 ≤ th < 1.1014001500
1.10 ≤ th < 1.2014601540
1.20 ≤ th < 1.30184015101590
1.30 ≤ th < 1.4015601630
1.40 ≤ th < 1.50170016101680
1.50 ≤ th < 1.60180017501670
1.60 ≤ th < 1.70180016101650
1.70 ≤ th < 1.90189015801480
1.90 ≤ th < 2.00195015601400
2.00 ≤ th < 2.10198018901540-
2.10 ≤ th < 2.301940185017901510
2.30 ≤ th < 2.401900184017701500
2.40 ≤ th < 2.5017301480
2.50 ≤ th < 2.6016901470
2.60 ≤ th < 2.70187016501450
2.70 ≤ th < 2.80178016101410
2.80 ≤ th < 2.901860174016001370
2.90 ≤ th < 3.00180017001330
3.00 ≤ th < 3.101760166014901290



 

Mechanical properties
   
 
Direction
Thickness (mm)
Re (MPa)
Rm (MPa)
A80 (%)
Bending ratio (th)
HC260LA EN 10268L0.5 - 0.7240 - 310340 - 420≥ 25-
0.7 - 3≥ 27
T0.5 - 0.7260 - 330350 - 430≥ 24-
0.7 - 3≥ 26
HC260LA AM FCEL0.5 - 0.7240 - 310340 - 420≥ 25-
0.7 - 3≥ 27
T0.5 - 0.7260 - 330350 - 430≥ 24≥ 0
0.7 - 3≥ 26
HC300LA EN 10268L0.5 - 0.7280 - 360370 - 470≥ 22-
0.7 - 3≥ 24
T0.5 - 0.7300 - 380380 - 480≥ 21-
0.7 - 3≥ 23
HC300LA AM FCEL0.5 - 0.7280 - 360370 - 470≥ 22-
0.7 - 3≥ 24
T0.5 - 0.7300 - 380380 - 480≥ 21≥ 0
0.7 - 3≥ 23
HC340LA EN 10268L0.5 - 0.7320 - 410400 - 500≥ 20-
0.7 - 3≥ 22
T0.5 - 0.7340 - 420410 - 510≥ 19-
0.7 - 3≥ 21
HC340LA AM FCEL0.5 - 0.7320 - 410400 - 500≥ 20-
0.7 - 3≥ 22
T0.5 - 0.7340 - 420410 - 510≥ 19≥ 0
0.7 - 3≥ 21
HC380LA EN 10268L0.5 - 0.7360 - 460430 - 550≥ 18-
0.7 - 3≥ 20
T0.5 - 0.7380 - 480440 - 560≥ 17-
0.7 - 3≥ 19
HC380LA AM FCEL0.5 - 0.7360 - 460450 - 550≥ 18-
0.7 - 3≥ 20
T0.5 - 0.7380 - 480460 - 560≥ 17≥ 0.5
0.7 - 3≥ 19
HC420LA EN 10268L0.5 - 0.7400 - 500460 - 580≥ 16-
0.7 - 3≥ 18
T0.5 - 0.7420 - 520470 - 590≥ 15-
0.7 - 3≥ 17
HC420LA AM FCEL0.5 - 0.7400 - 500470 - 580≥ 16-
0.7 - 3≥ 18
T0.5 - 0.7420 - 520480 - 590≥ 15≥ 0.5
0.7 - 3≥ 17
HC460LA AM FCET0.5 - 0.7460 - 560550 - 650≥ 13-
0.7 - 2≥ 15
Grades in italics: not included in the standard
Values in bold: tighter than the standard

For AM FCE grades, the choice of direction for the mechanical properties should be specified when ordering.



 

Chemical composition
   
 
C (%)
Mn (%)
P (%)
S (%)
Si (%)
Al (%)
Nb (%)
Ti (%)
Galvanisation
HC260LA EN 10268 ≤ 0.100 ≤ 0.60 ≤ 0.025 ≤ 0.025 ≤ 0.50 ≥ 0.015 - ≤ 0.150 -
HC260LA AM FCE 0.080 ≤ 0.60 ≤ 0.025 0.020 0.03 ≥ 0.015 0.090 ≤ 0.150 Class 1
HC300LA EN 10268 ≤ 0.100 ≤ 1.00 ≤ 0.025 ≤ 0.025 ≤ 0.50 ≥ 0.015 ≤ 0.090 ≤ 0.150 -
HC300LA AM FCE 0.090 0.70 ≤ 0.025 0.020 0.03 ≥ 0.015 ≤ 0.090 ≤ 0.150 Class 1
HC340LA EN 10268 ≤ 0.100 ≤ 1.10 ≤ 0.025 ≤ 0.025 ≤ 0.50 ≥ 0.015 ≤ 0.090 ≤ 0.150 -
HC340LA AM FCE ≤ 0.100 0.90 ≤ 0.025 0.020 0.03 ≥ 0.015 ≤ 0.090 ≤ 0.150 Class 1
HC380LA EN 10268 ≤ 0.100 ≤ 1.60 ≤ 0.025 ≤ 0.025 ≤ 0.50 ≥ 0.015 ≤ 0.090 ≤ 0.150 -
HC380LA AM FCE ≤ 0.100 1.00 ≤ 0.025 0.020 0.35 ≥ 0.015 ≤ 0.090 ≤ 0.150 No
HC420LA EN 10268 ≤ 0.100 ≤ 1.60 ≤ 0.025 ≤ 0.025 ≤ 0.50 ≥ 0.015 ≤ 0.090 ≤ 0.150 -
HC420LA AM FCE ≤ 0.100 1.20 ≤ 0.025 0.020 0.15 ≥ 0.015 ≤ 0.090 ≤ 0.150 No
HC460LA AM FCE 0.100 1.60 0.025 0.020 0.15 0.015 0.090 0.150 No
Grades in italics: not included in the standard
Values in bold: tighter than the standard

V+Nb+Ti ≤ 0.22%



   
For commercial information (quotations, deliveries, product availability):

For technical questions about these products: fce.technical.assistance@arcelormittal.com
For researchers: click here


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.