The method of manufacturing a chemically strengthened glass sheet

The present invention provides a method of manufacturing a chemically reinforced glass plate, by the alkali metal ions ion-up A substituted ionic radius larger than that of the alkali metal ion A B alkali metal ions contained in the glass surface of the glass substrate in the manufacture of chemical exchange tempered glass sheet, the glass sheet prior to ion exchange by a soda-lime glass, the manufacturing method comprising the steps of: first: the glass sheet in contact with the first salt containing an alkali metal ion a, the first salt is an alkali metal ion a molar amount relative to the total molar amount of the alkali metal ion ratio of X = 90 ~ 100mol%; second: after the first step of contacting the glass plate containing an alkali metal salt of a second B ion, alkali metal ion having a second salt a molar amount relative to the total molar amount of the alkali metal ion ratio of Y = 0 ~ 10mol%; third: after the second step comprising contacting the glass plate with an alkali metal salt of a third B ion, a salt with a third base B molar amount of metal ion relative to the total molar amount of alkali metal ions, the ratio of Z = 98 ~ 100mol%.