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MICRO-ALLOYED STEELS
           

 

 

Applications

Micro-alloyed grade steels are characterized by a fine structure and improved cold formability. The sheets are used for dynamically stressed parts of vehicles.
U. S. Steel Košice has implemented and maintains a quality control system in accordance with the standard EN ISO 9001 and IATF 16949 for the automotive industry, issued by TÜV SÜD.

 

Grades

Galvanized products are classified into quality grades according to their chemical composition and mechanical properties.

TECHNICAL SPECIFICATION

MICRO-ALLOYED GRADES

European standard
EN 10346/09		 USA
ASTM A 653M
HX260LAD + Z, + ZF -
HX300LAD + Z, + ZF -
HX340LAD + Z, + ZF A 653 HSLA, Grade A,B
HX380LAD + Z, + ZF -
HX420LAD + Z, + ZF A 653 HSLA, Grade A,B

ZF surfaces are subject to prior agreement

CHEMICAL COMPOSITION

Grades according to
EN 10346/09		 Heat analysis in %
C MnMAX SiMAX PMAX SMAX Al NbMAX TiMAX
HX260LAD + Z, + ZF max.0,11 0,60 0,50 0,030 0,025 min. 0,015 0,090 0,12
HX300LAD + Z, + ZF max.0,11 1,00 0,50 0,030 0,025 min. 0,015 0,090 0,15
HX340LAD + Z, + ZF max.0,11 1,00 0,50 0,030 0,025 min. 0,015 0,090 0,15
HX380LAD + Z, + ZF max.0,11 1,40 0,50 0,030 0,025 min. 0,015 0,090 0,15
HX420LAD + Z, + ZF max.0,11 1,40 0,50 0,030 0,025 min. 0,015 0,090 0,15

MECHANICAL PROPERTIES

Grades according to
EN 10346/09		 Rp0,2
[MPa]		 Rm
[MPa]		 A MIN (%)
Lo = 80 mm
HX260LAD + Z, ZF 260-330 350-430 26; (24)1)
HX300LAD + Z, ZF 300-380 380-480 23; (21)1)
HX340LAD + Z, ZF 340-420 410-510 21; (19)1)
HX380LAD + Z, ZF 380-480 440-560 19; (17)1)
HX420LAD + Z, ZF 420-520 470-590 17; (15)1)

1) valid for ZF surface

Transversal sampling

DIMENSIONS OF SHEETS AND COILS [ mm ]                                                                                              HX260LAD, HX300LAD

Nominal thickness   800 990 1190 1300 1500
0,45 - 0,59            
0,60 - 0,79          
0,80 - 1,29        
1,30 - 2,00      

DIMENSIONS OF SHEETS AND COILS [ mm ]                                                                                              HX340LAD, HX380LAD

Nominal thickness   800 900 1100 1180 1240 1300
0,50 - 0,59              
0,60 - 1,09            
1,10 - 1,49          
1,50 - 1,89        
1,90 - 2,00      

DIMENSIONS OF SHEETS AND COILS [ mm ]                                                                                                                  HX420LAD

Nominal thickness   800 1160 1300 1360 1400
1,00 - 1,19            
1,20 - 1,79          
1,80 - 1,89        
1,90 - 2,00      
Nominal thickness Sheet length Coil diameter Slit coil width Nominal coil weight
[kg.mm -1 of width]
inner outer
0,50 - 2,00 1 000 - 3 100 approx. 500 max. 1 400 40 - 600
(depending on sheet thickness)		 3 - 9,9
approx. 600
2 - 9,4

NOTE:  - thickness is graded by 0,01 mm, width is graded by 5,0 mm, length is graded by 5 mm
             - nominal thickness includes zinc coat

THICKNESS TOLERANCES - EN 10143/06 [ mm ]                                                                                                       Re < 260 MPa

Nominal
thickness		 Normal tolerances at width Reduced tolerances at width
≤ 1 200 >1 200 ≤ 1 500 ≤ 1 200 >1 200 ≤ 1 500
> 0,40 ≤ 0,60 ± 0,04 ± 0,05 ± 0,035 ± 0,040
> 0,60 ≤ 0,80 ± 0,05 ± 0,06 ± 0,040 ± 0,045
> 0,80 ≤ 1,00 ± 0,06 ± 0,07 ± 0,045 ± 0,050
> 1,00 ≤ 1,20 ± 0,07 ± 0,08 ± 0,050 ± 0,060
> 1,20 ≤ 1,60 ± 0,10 ± 0,11 ± 0,060 ± 0,070
> 1,60 ≤ 2,00 ± 0,12 ± 0,13 ± 0,070 ± 0,080

NOTE: reduced tolerances are the subject to prior agreement

THICKNESS TOLERANCES - EN 10143/06 [ mm ]                                                                                             260 ≤ Re < 360 MPa

Nominal
thickness		 Nominal
thickness		 Reduced tolerances at width
≤ 1 200 >1 200 ≤ 1 500 ≤ 1 200 >1 200 ≤ 1 500
> 0,40 ≤ 0,60 ± 0,05 ± 0,06 ± 0,040 ± 0,045
> 0,60 ≤ 0,80 ± 0,06 ± 0,07 ± 0,045 ± 0,050
> 0,80 ≤ 1,00 ± 0,07 ± 0,08 ± 0,050 ± 0,060
> 1,00 ≤ 1,20 ± 0,08 ± 0,09 ± 0,060 ± 0,070
> 1,20 ≤ 1,60 ± 0,11 ± 0,13 ± 0,070 ± 0,080
> 1,60 ≤ 2,00 ± 0,14 ± 0,15 ± 0,080 ± 0,090

NOTE: reduced tolerances are the subject to prior agreement

THICKNESS TOLERANCES - EN 10143/06 [ mm ]                                                                                             360 ≤ Re < 420 MPa

Nominal
thickness		 Nominal
thickness		 Reduced tolerances at width
≤ 1 200 >1 200 ≤ 1 500 ≤ 1 200 >1 200 ≤ 1 500
> 0,40 ≤ 0,60 ± 0,06 ± 0,07 ± 0,045 ± 0,050
> 0,60 ≤ 0,80 ± 0,07 ± 0,08 ± 0,050 ± 0,060
> 0,80 ≤ 1,00 ± 0,08 ± 0,09 ± 0,060 ± 0,070
> 1,00 ≤ 1,20 ± 0,10 ± 0,11 ± 0,070 ± 0,080
> 1,20 ≤ 1,60 ± 0,13 ± 0,14 ± 0,080 ± 0,090
> 1,60 ≤ 2,00 ± 0,16 ± 0,17 ± 0,090 ± 0,110

NOTE: reduced tolerances are the subject to prior agreement

SHEET FLATNESS TOLERANCES1) IN ACCORDANCE WITH EN 10143/06 [ mm ]                                                                           Re < 260 MPa

Nominal width Normal tolerances at thickness Reduced tolerances at thickness
< 0,70  ≥ 0,70 < 2,00 < 0,70  ≥ 0,70 < 1,60  ≥ 1,60 ≤ 2,00
 ≥ 600 < 1 200 10 8 5 4 3
 ≥ 1 200 < 1 500 12 10 6 5 4
 ≥ 1 500 17 15 8 7 6

1) coil flatness tolerances are subject to prior agreement
2) reduced tolerances are subject to prior agreement

SHEET FLATNESS TOLERANCES1) IN ACCORDANCE WITH EN 10143/06 [ mm ]                                                                260 ≤ Re < 360 MPa

Nominal width Normal tolerances at thickness Reduced tolerances at thickness
< 0,70  ≥ 0,70 < 2,00 < 0,70  ≥ 0,70 < 1,60  ≥ 1,60 ≤ 2,00
 ≥ 600 < 1 200 13 10 8 6 5
 ≥ 1 200 < 1 500 15 13 9 8 6
 ≥ 1 500 20 19 12 10 9

 

1) coil flatness tolerances are subject to prior agreement
2) reduced tolerances are subject to prior agreement

SHEET FLATNESS TOLERANCES - EN 10143/06 [ mm ]                                                                                                                       Re ≥ 360 MPa

NOTE: sheet flatness tolerances for steels with yield strength Re > 360 MPa are subject to prior agreement

COATING PROPERTIES

Zinc coated products (Z)

  • normal zinc spangle (N)
  • minimized spangle (M)

Zinc-iron alloy coated products (ZF)
 

SURFACE QUALITY

  • coated surface A          according to EN 10 346/09
  • improved surface B     according to EN 10 346/09

SURFACE TREATMENT

  • chemically passivated C (Cr 6+ free; f- - free, RoHS compliant
  • oiled O (0,6-2,5 g.m-2 )
  • chemically passivated and oiled CO (only coils)
  • TOC (Thin Organic Coating) S
  • without surface treatment

PARAMETERS OF COATING

Zinc coating
(Z)		 Min. weight of surface coating from
both sides [g.m-2]
same 100; 140; 150; 180; 200; 225; 275;(350)
differential 140/100; 150/85;

 

Zinc-iron coating
(ZF)		 Min. weight of surface coating from
both sides [g.m-2]
same 90; 100; 110; 120

 

Other dimensions are subject to prior agreement
Informative thickness of zinc layer: 7g.m-2 ≈ 1μm

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GENERAL DELIVERY TERMS AND CONDITIONS

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Logistics information

 

We offer flexible product delivery with multiple options for packaging and methods of transportation.

 

Shipping

The final products are shipped to customers via truck, railway, ships or transportation directly from our covered storage yard.

                

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+421 556 734 538
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POSTAL ADDRESS:
 

U. S. Steel Košice, s.r.o.
Vstupný areál U. S. Steel
044 54 Košice
Slovak Republic

 

BILLING INFORMATION:
 

ID No.: 36 199 222
VAT ID: SK7020000119
Commercial Register: District Court Kosice I, Sec.: Sro, File No.: 11711/V

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