Global Patent Index - EP 0828008 A3

EP 0828008 A3 19981111 - Aluminium alloy with good machinability

Title (en)

Aluminium alloy with good machinability

Title (de)

Aluminiumlegierung mit guter Spanbarkeit

Title (fr)

Alliage d'aluminium avec une bonne usinabilité

Publication

EP 0828008 A3 19981111 (DE)

Application

EP 97810609 A 19970828

Priority

CZ 262896 A 19960909

Abstract (en)

[origin: EP0828008A2] A machinable aluminium alloy, especially a free-machining AlCu or AlMgSi alloy, contains 0.2-1.2 wt.% Sn and 0.2-1.0 wt.% Bi as chip-breaking additives. Preferably, the alloy has the composition (by wt.): (a) 4.6-6.0% Cu, 0.2-1.0 (preferably 0.4-0.9, especially 0.6-0.8)% Bi, 0.2-0.7 (preferably 0.3-0.6, especially 0.4-0.6)% Sn, NOTGREATER 0.45% Zn, NOTGREATER 0.7% Fe, NOTGREATER 0.4% Si, NOTGREATER 0.05% each ( NOTGREATER 0.15% total) of other alloying elements and balance Al; or (b) 0.6-1.2% Mg, 0.6-1.4% Si, 0.6-1.2 (preferably 0.7-1.0, especially 0.7-0.9)% Sn, 0.2-0.7 (preferably 0.3-0.6, especially 0.4-0.6)% Bi, 0.2-0.6% Mn, NOTGREATER 0.5% Fe, NOTGREATER 5 (preferably 0.15-0.40)% Cu, NOTGREATER 0.2 (preferably 0.04-0.10)% Ti, NOTGREATER 0.05% each ( NOTGREATER 0.15% total) of other alloying elements and balance Al. Preferably, alloy (a) is produced by semi-continuous casting, high temperature annealing and extruding, followed by (i) solution annealing, quenching and artificial ageing to the maximum age-hardened state, resulting in a tensile strength of ≥ 370 MPa, a yield strength of ≥ 280 MPa, a hardness of ≥ 110 HB and an elongation at fracture (A5) of ≥ 10%; or (ii) solution annealing, quenching and artificial ageing to less than the maximum age-hardened state, resulting in a tensile strength of ≥ 270 MPa, a yield strength of ≥ 150 MPa, a hardness of ≥ 80 HB and an elongation at fracture (A5) of ≥ 20%.

IPC 1-7

C22C 21/12; C22C 21/14; C22C 21/16; C22F 1/057

IPC 8 full level

C22C 21/00 (2006.01); C22C 21/02 (2006.01); C22C 21/08 (2006.01); C22C 21/12 (2006.01); C22C 21/16 (2006.01)

CPC (source: EP)

C22C 21/003 (2013.01); C22C 21/02 (2013.01); C22C 21/08 (2013.01); C22C 21/12 (2013.01)

Citation (search report)

  • [XA] WO 9613617 A1 19960509 - REYNOLDS METALS CO [US]
  • [A] DE 2155322 A1 19730517 - SCHREIBER GMBH CARL
  • [XA] EP 0528454 A1 19930224 - GEN MOTORS CORP [US]
  • [A] PODGORNIK A ET AL: "DER EINFLUSS DER OBERFLAECHENSPANNUNG AUF GROESSE UND VERTEILUNG VON SPANBRECHENDEN EINSCHLUESSEN BEU LEGIERUNGEN VON TYP ALCU5(PB)(BI)", ALUMINIUM, vol. 47, no. 9, 1971, pages 554 - 556, XP002050754
  • [A] PATENT ABSTRACTS OF JAPAN vol. 015, no. 173 (C - 0828) 2 May 1991 (1991-05-02)
  • [XA] PATENT ABSTRACTS OF JAPAN vol. 095, no. 011 26 December 1995 (1995-12-26)
  • [XA] PATENT ABSTRACTS OF JAPAN vol. 095, no. 007 31 August 1995 (1995-08-31)
  • [XA] PATENT ABSTRACTS OF JAPAN vol. 010, no. 362 (C - 389) 4 December 1986 (1986-12-04)
  • [XA] PATENT ABSTRACTS OF JAPAN vol. 018, no. 285 (C - 1206) 31 May 1994 (1994-05-31)

Designated contracting state (EPC)

AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

DOCDB simple family (publication)

EP 0828008 A2 19980311; EP 0828008 A3 19981111; EP 0828008 B1 20000705; AT E194393 T1 20000715; CZ 262896 A3 19990512; CZ 286150 B6 20000112; DE 59701965 D1 20000810; EP 0982410 A1 20000301; HU 9701466 D0 19971128; HU P9701466 A2 19990628; HU P9701466 A3 20020328; PL 183835 B1 20020731; PL 321947 A1 19980316; SI 9700232 A 19980430

DOCDB simple family (application)

EP 97810609 A 19970828; AT 97810609 T 19970828; CZ 262896 A 19960909; DE 59701965 T 19970828; EP 99121526 A 19970828; HU P9701466 A 19970903; PL 32194797 A 19970905; SI 9700232 A 19970909