EN-10031 pdf free download

EN-10031 pdf free download. Semi-finished products for forging.
5.2 Diagonal tolerances The difference between the two diagonals of the same section shall be≤6 % of the larger of the two diagonals for semi-finished products of nominal width S 200 mm. For wider semi-finished products, the tolerance shall be the subject of agreement at the time of enquiry and order. 5.3 Length tolerances 5.3.1 Delivery in standard lengths If standard lengths are ordered, a tolerance of土1000 mm shall apply. Semi-finished products shall have a length≥ 1000 mm unless agreed at the time of enquiry and order. In addition, for semi-finished products of nominal cross-sectional area≤22500 mm”, only 10 % (relative to the mass of the order) of semi-finished products shorter than the values indicated is permitted per delivery. For semi-finished products of nominal cross-sectional area > 22 500 mm’, the percentage of short semi-finished products shall be the subject of agreement at the time of enquiry and order. 5.3.2 Delivery in fixed lengths If fixed lengths are ordered, the following tolerance classes apply: a) Normal tolerance,土250 mm; b) Tightened tolerance,土100 mm; c) Reduced tolerance,土50 mm. The tolerance class shall be specified at the time of order. If there is no tolerance indication, the normal tolerance (土250 mm) applies. Special tolerances lower than those specified in a), b) or c) may be agreed at the time of enquiry and order. If agreed at the time of enquiry and order, the tolerance may be totally positive or totally negative. In addition, if specified at the time of enquiry and order, 20 % of the semi-finished products shall be permitted in sub-multiples of the service length; the tolerances applicable to these short bars are one class tighter than those specified for the ordered length. 6 Shape tolerances 6.1 Straightness Semi-finished products shall be delivered hot formed without any special straightening. The permissible deviations shall be: – in the case of bending, 10 mm per metre uniformly distributed (see Figure 1); – in the case of local deformations or waviness, 20 mm per metre (see Figure 2). If specified at the time of enquiry and order, special straightening shall be carried out; the permissible deviations shall be less than 4 mm per m. Tolerances on deformation of the ends may be agreed at the time of enquiry and order. 6.2 Twist Square semi-finished products shall not have a twist angle greater than 4° per m, with a maximum of 10° for lengths≤6 m and 15° for greater lengths. Rectangular semifinished products shall not have a twist likely to adversely affect their application. If specified at the time of enquiry and order, the tolerances specified for square semi-finished products also apply for rectangular semi-finished products. 7 Tolerances on mass 7.1 Tolerances on mass per unit length 7.1.1 Case of billets The mass shall be between 88% and 100% inclusive of the theoretical mass per unit length corresponding to the nominal cross-sectional area (square or rectangle of the corresponding dimensions). 7.1.2 Case of blooms and slabs The mass shall be between 94% and 100% inclusive of the theoretical mass per unit length corresponding to the nominal cross-sectional area (square or rectangle of the corresponding dimensions).EN-10031 pdf download.