The invention relates to a method for extraction of saccharides from a lignocellulose containing material and comprises the steps of mixing the lignocellulose containing material with an acidic water solution to create a slurry having a pH value in the interval of 0-4; controlling the water content of the slurry to obtain a specific dry solid content of more than 30%; and introducing the slurry into an apparatus and performing an acid hydrolysis of the slurry in the apparatus, wherein at least parts of the apparatus that come into contact with the slurry are made of a material that comprises iron in an amount of at least 50% by weight and nickel in an amount of at least 1.5% by weight. The invention relates also to an apparatus for performing said method.