ALUMINIUM DELFZIJL BV

EXTRUSION BILLETS


1.   Product
       These specifications describe the standard characteristics of the round extrusion billets
       in the aluminium alloy series 1xxx, 3xxx, 6xxx and 7xxx. 

2.   Chemical composition
       Each charge is alloyed according to the order specifications of the customer.
       A certificate according to EN 10204 3.1B is delivered with each charge.
       Analysis is performed with the automatic Spectrolab Robotic ME optical
       emission spectrometer.
       The laboratory is RvA accredited according to EN 17025 (Sterlab).

3.   Charge
      Minimum net charge size: 20 tonnes. Maximum gross charge size: 30 tonnes.

4.   Dimensions:

 

       Hot-top Airslip (Wagstaff)                                         Numax (Wagstaff)

Diameter (mm)

Tolerances (mm)

178

176.5 - 178.0

193

191.5 - 193.0

196

194.5 - 196.0

203

201.0 - 202.5

207

205.5 - 207.0

216

215.5 - 217.0

229

227.0 - 228.5

253

252.0 - 253.5

305

303.0 - 305.0
 

Diameter (mm)

Tolerances (mm)

396

394.5 - 396.0

485

482.0 - 485.0
 

       Length:

      1xxx series                   :           300mm - 6400mm

      3xxx series                   :           300mm - 6400mm

      6xxx , 7xxxx series       :           6400mm

 

Length tolerances

Straightness

Sawing

< 1000 mm: ± 3 mm

Length < 1000 max. 2mm/m

90º + 0.5º

1000 - 6400: ± 5 mm

Length 1000 - 6400 max. 2mm/m; max. 10 mm

Free of sawing
chips

  

      Accepted tolerance:  within one charge ± 2 mm

 

5.   Metallurgical properties
       Segregation zone:
       Airslip billets     :           < 0.25 mm Numax billets    :           < 3 mm

 

      Homogenisation: standard homogenisation of the billets

Alloy

Heat treatment

Cooling

1xxx

-

-

3xxx

8 h,  610 ºC

Customer specification

6xxx Si 0.5*

4 h, 585 ºC

> 250 ºC /h.

6xxx Si 1*

4 h, 570 ºC

> 250 ºC /h.

      * Predominantly the homogenisation is performed in a continuous homogenisation furnace

 

  • Homogeneous chemical composition
  • H2 -content < 0,20 ml/ 100 gr Al (Alscan method). Typical value 0,18 ml/100 gr. AL
  • Homogeneous grain structure (min. 20 K/mm2)
  • Free of inclusions, cold shuts larger than 1mm and mechanical damage larger than 3 mm. 

 6.   Marking
       A stamp on the saw cut of all billets stating:

  • ALDEL 
  • Charge number
  • Alloy 

      Each bundle has a Barcode-label stating:

  • DELFZIJL
  • Casting number
  • Bundle number
  • Customer alloy code
  • Dimensions
  • Net weight

 7.    Packaging

  • The billets are packed according to customer specification.
  • The Billets are packed on wooden spacers with 3 to 7 steel or plastic straps