( Bronzes )

              Caractéristiques physiques et mécaniques

              Densité : voir indications d’emploi

                        Intervalle de fusion                    900 à 1070°C         Coefficient de dilatation linéaire à 20°C          17 à 19 x 10 –6

                        Température de forgeage          675 à 700°C           Conductibilité thermique à °C                           0.13 à 0.20 cal.cm.s.°C

                        Température de recuit                470 à 600°C           Module d’élasticité à 20°C                                11 100 kg/mm²

                        Coefficient de poison                0.33 environ          Module de torsion                                             4000 kg/mm²

                                                               Barres et profilés                                                                     Laminés                                                              

                        Symbole        Caractéristiques moyennes      Désigna-                          H14                           H15       

                        AFNOR                                                                                            tion   

                        ( ancien)        Rkg/mm²      E kg/mm²         A%          Dureté                   RN/mm²  HV     A%     Elas.    R     HV                A           E

                                                                                                              Brinell                                                        0.2%                

                                                                                                                                                                                  N/mm²

                        Ue7                24 à 31           12 à 16            18 à 25    12 à 16      Ue3Z9      610        190      4         580     580    205          -              650

                        Ue9P              40 à 55           25 à 45            50 à 30    25 à 45      Cusn3Z9 680         210     

                        Ue12P            35 à 37           15 à 18              8 à 17    15 à 18      Ue9P        700         210      5         680     680   235          -              750

                        Ue3Z9            65 à 70           62 à 67              3 à 5      62 à 67       Cusn9P   780         240

                        UZ23A4        65 à 70               31                                     31

                        UA9Nfe         65 à 72           30 à 35            12 à 20    30 à 35

                                                                                                              HV et A sont donnés à titre indicatif.

                                                                                                              La valeur moyenne commune du modèle

                                                                                                              D’élasticité est de 111 000 N/mm².   

        Caractéristiques chimiques et électriques

                                                               Composition chimique moyenne                                        Conductivité                     Résistance élec.

                                                                                                                                                                             (IACS)                   maxi. (µ.Ω.cm)

                                                               Be            Fe            Zn            Pb              Sn    AL       Ni        Cu                       

                        Phosphoreux: CuSnZn5Pb4                                            5              4                 7                           le reste                                                                .

                        Phosphoreux : CuSn9P                                                                                      9                                -         11.5%                                               .

                        Marine :          Cusn12 P                                                                                   12                              -                                                                  .

                        Chrysocale :    CuSn3Zn9                                                9                                3                                 -         22%                                                  .

                        HR : Cu Zn 23 AL4                                                         23                                        4                      -.                                                                 .

                        Cupro Aluminium : Cu AL9NiFe                      2.5                                                       9          5          -                                                                  

                        Cupro Aluminuim : Cu AL10Ni                       4                                                          10         5         -                                                                  .

                        Cupro Aluminium : CuBe2                  2                                                                                    -          -

              Indications d’emploi

                        Nuances        densité   Laminés      Tréfilé      Etirés     Tubes et      Coulés     Forgés                          Propriétés et principaux

                                                                                                     Ou filés  profilés                                                            domaines d’application

                        Cusn3Zn9       8.70        n                                                                                                                            Contacts électriques, ressorts, disques.

                        Cusn7              8.75                                                                                       n                                             Coussinets, douilles. Comportement

                        Zn5Pb4                                                                                                                                                         .Parfait sous faible et moyenne pressions  .                                                                                                                                                                                                    à petite et moyenne vitesses.

                        CuSn9P           8.80         n                  n               n             n                                                                    Résistant à l’usure, bonne tenue au frottement                                                                                                                

                        CuSn12P         8.80                                                                                       n                                             .Excellente résistance à l’usure, chocs

                                                                                                                                                                                                Et charges. Coussinets, automobiles,

                        .                                                                                                                                                                      .Machines- outils.

                        Cu AL9NiIFe  7.60         n                                    n             n                                     n                           Résistance mécanique élevée à l'usure aux chocs ,à la corrosion ,

                                                                                                                                                                                                à l'eau  de mer ; excellente soudabilité ; inoxydable ,tuyautage

                                                                                                                                                                                                chaud ,marine Nationale.                                                      .

                        Cu Be2            8.26          n                 n               n                                                      n                           Grande résistance à la traction, à la

                                                                                                                                                                                                Fatigue, à la corrosion ; bonne conductibilité

                                                                                                                    Ressorts, pièces de frottement.

                                                                                                                                                                                                Amagnètisme . Contacts, diaphragmes.

                        Cu Zn23AL4   7.8                                                                                         n                                             Extra dur. Soutient de grandes pressions

                                                                                                                                                                                                à petites       vitesses .Engrenages,                                                                                                                                                                                                           pièces En contact avec l’eau.

Bronzes au plomb              l     m    n     ▬

       Alliage    .                  Composition chimique       .                          .             Caractéristiques mécaniques          .

       Nuance    %Cu         %Zn        %Al         %Fe         %Sn         %Pb         Densité    HB           RM          E             A%

                                                                                                                                     G/cm3                     Mpa/mm²       Mpa/mm²      

       Cupb15sn8              soldes       <3            -              -              8              15            9.1           70            200          100          8

       Cupb20sn5              solde        <3            -              -              5              20            9.2           60            180          90            7

       Cupb10sn10 soldes  <1            -              -              10            10            9.1           80            210          120          7               

       Propriétés et                         Cu Pb15 Sn8 : très facile à usiner, pour coussinets devant garder une certaine plasticité.

       Principaux                                                     Recommandés pour coussinets dont les arbres ont de fréquents arrêts et démarrages.

       Domaines d’application      Cu Pb20 Sn5 : excellente résistance à l’usure ; supprime les risques de grippage, même

                                                                               Dans de mauvaises conditions de graissage. Pour coussinets et bagues tournant à très

                                                                               Grande vitesse.

                                                     Cu Pb10 Sn10 : bronze de frottement de très haute résistance. Pour des pièces soumises

                                                                               Aux très fortes charges, chocs et écrasement, dans de mauvaises conditions de graissage

                                                                               Et d’entretien.