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Cognor Spółka Akcyjna Oddział Ferrostal Łabędy w Gliwicach

44-109 Gliwice,
Anny Jagiellonki Street 47
phone: (+48 32) 2347 600
fax: (+48 32) 2347 650
e-mail:

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4. Requirements

a) Surface

The surface is typical for the steel continuous casting process.

On the surface of concast billets the following defects with depth lower than 1.5% of the crosswise dimension are permitted:

-          oscillatory teeming laps,

-          scratches,

-          pinholes,

-          slag inclusions,

-          shrinkage depressions,

-          dents.

Upon agreement with the orderer it is permitted to deliver billets with surface defects deeper than 1.5% of the crosswise dimension, if the intensity and depth of these defects do not cause worsening of the surface quality of the finished products under further processing.

It is allowed to remove surface defects of greater depth by flame desurfacing (rinsing) or mechanical cleaning (chiselling, grinding), whereas the machined surface should have soft cavities and rounded edges, and the depth at the place of the removed defect should not exceed 6% of the billet crosswise dimension.


b) Internal quality

  •     For concast billets with square and rectangular sections:

Pursuant to tables below, FERROSTAL ŁABĘDY confirms the internal quality of concast billets according to the below mentioned classes:

¨                  axial porosity (table 1)                                                 I / 2 –  min. 90 % of billets

¨                  axial micro-shrinkage (table 2)                                 II / 2 – min. 90 % of billets

¨                  internal cracks over grain boundaries (table 3)    III / 2

¨                  cracks over diagonals (table 4)                                IV/2          

¨                  star-shaped cracks (table 5)                                    V/2

¨                  pinholes and subcutaneous blowholes (table 6) VI/2                               

 

  • For concast billets with round section:

 The concast billets should meet the undermentioned requirements according to the classification of Mannesman Demag concerning internal defects in the continuously cast material. FERROSTAL ŁABĘDY confirms the internal quality of concast billets according to the below mentioned classes:

¨      Degree of purity     2

¨      Surface zone           2

¨      Middle zone             2

¨      Core zone               2

 In case the orderer is interested in other standards, it should be each time stated in the order.

 

c) Dimensions of concast billets.

-          Nominal dimensions of the cross section, acceptable dimensional deviations, weight of 1 running metre of billet are presented on the drawings and table.

 For concast billets with square and rectangular sections:


       

 

Dimensions

   of section

Dimensions and acceptable  dimensional deviations

Corner radius R:

Weight of 1 running metre of concast billet

g max deviation
h max deviation
mm mm mm mm mm mm kg
100 x 100 100 ± 3 100 ± 3 4 77,0
120 x 120 120 ± 3 120 ± 3 4 110,0
130 x 130 130 ± 5 130 ± 5 6 130,0
140 x 140 140 ± 5 140 ± 5 6 151,0
140 x 165 165 ± 5 140 ± 5 6 177,0
160 x 160 160 ± 5 160 ± 5 6 196,0


 

  • For concast billets with round section:


 Weight of 1running metre of concast billet amounts to 175.0 kg

 
d) Skewness

  • For concast billets with square and rectangular sections:

 The acceptable skewness of the cross section measured as the difference of section diagonals should not exceed:

 -          8mm (for square 100x100,120x120, 130x130 and 140x140mm),

 -          10mm (for rectangle 140x165 and square 160x160mm),

 -          12mm (for square 160x160mm – only for grades with carbon content C > 0,17% open cast).

 

  • For concast billets with round section:

  Diameter tolerance                 +3/-3 mm

  Local ovality                             max 2,5%

  The ovality is calculated according to the formula:

 OV = 2(D1-D2) / D1+D2 x 100%


e) Length

-   Concast billets are delivered in lengths 5,6 - 12,4m.

-  The delivery of concast billets in shorter lengths is permitted upon additional agreement. The minimum length of the concast billet mechanically cut amounts to 4,6m.

-   The permissible deviation of the concast billet length should not exceed  ± 100mm.

-  In the delivery of concast billets up to 5% of shorts resulting from the technological process of the CC machine is permitted.

 

f) Straightness

-  Concast billets are delivered as not straigthened.

-   The permissible straightness deviation should not exceed 1% of the measured length.

 

g) Twist
-    Twist along the longitudinal axis of max. 1o over the length of 1m is permitted.


h) Ends

-  On the end faces of concast billets the occurrence of out-of-flatness, grooves, partial melting and pits typical for the cutting process with gas and oxygen torches is accepted.

-  At the ends of concast billets the occurrence of fin typical for cutting of concast billets with gas and oxygen torches is permitted.

-   In the axial zone the occurrence of fine cracks, micro-shrinkage and porosity is accepted.

 

i)  Processing reduction ratio

 The minimum processing reduction ratio of concast billets should be 6,0:1.

 

j)  Marking

 Concast billets are marked with the following marks on the end face or lateral surface:

-         number of heat,

-         grade of steel,

-         Another way of marking is acceptable upon agreement.

 

k)     Dispatch

Concast billets are dispatched together with a documentation (specification of delivery), which should include the following information:

-          heat No,

-          length of billets,

-          wagon No/truck No,

-          number of billets,

-          weight of billets,

-          order No.

 

 

 

 

 

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