DINEN10268_2006_HSLA

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1、UJQUE.xcgasu nr rnrrp eusort 2 Jc p d a npskcRck h PFpC?_a3t 600 mm10Products of rolled width 600 mm10Number of tests10Sampling10Test methods11Chemical analysis11Inspection document7 Marking7.1 Products of rolled width 2 600 mm7.2 Products of rolled width e added. However, the sum of the contents of

2、 these four dispersoidal elements shall not exceed 0,22 %“b For all interstitial free (Y) grades. Nb may be added alternatively or in combination with Ti. For all grades containing T in its designation, Ti can be substituted by Nb or B.5.4 Mechanical propertiesThe products shall comply with the requ

3、irements for transverse test pieces given in Table 2. By agreement, they may be delivered as suitable for making a particular part; in this case a maximum percentage of scrap may be agreed and accepts nee on the basis of mecha nical properties is not applicable The mechanical properties given in Tab

4、le 2 and Table 3 are valid for a period of at least 6 months from the date on which the products are made available.By agreement, special formability criteria can be defined between producer and purchaser.7EN 10268:2006 (E)#EN 10268:2006 (E)Steel nameSteel number0,2% proof strength aIncrease in proo

5、f strength after heating bTensile strengthElongationCPlastic strain ratioPlastic strain ratio bdeStrain harde ning exponent dtrans MPabh2 min. trans. MPaRmtrans MPa人80min. trans %r max. trans.r min. trans n min. trans HC180Y1.0922180-230340-400361,70,19HC180P1.0342180-230280-3603A1.60,17HC180B1.0395

6、180-23035300-360341,60,17HC220Y1.0925220-270350-420341,60.18HC220I1.0346220-270300-380341,40,18HC220P1.0397220-270320-400321.30,16HC220B1.0396220-27035320-400321.50.16HC260Y1.0928260-320380-440321,40,17HC260I1.0349260-310320-400321,40J7HC260P1.0417260-320360-44029HC260B1.0400260-3203536044029HC260LA

7、1.0480260-330350-43026HC300I1.0447300-350340-440301,40,16HC300P1.0448300-360400-48026HC300B1.0444300-36035400-48026HC300LA1.0489300-380380-48023HC340LA1.0548340-420410-51021HC380LA1.0550380-480440-56019HC420LA1.0556420-520470-59017NOTE 1 h/Pa = 1 N/mm2.3 if the yield strength is pronounced, the valu

8、es apply to the lower yield point (R).b For thicknesses 1,2 mm special agreements must be madec When tne thickness is less than or equal to 0,7 mm and greater than 9,5 mm. the minimum value for elongation is reduced by 2 unitsd The minimum values for r (trans.) and n (trans.) only apply to products

9、of thickness equal to or greater than 0.5 mm.e For products with thickne$s over 2 mm the minimum r (trans.) value is reduced by 0.2.Table 2 Mechanical properties of transverse test pieces9EN 10268:2006 (E)For the LA grades it may be agreed that the requirements given in Table 3 for Iongitudinal test

10、 pieces shall apply in stead of those for tran sverse test pieces.Table 3 Mechanical properties of longitudinal test piecesSteel nameSteel number0.2% proof strength aTensile strengthElon gation b&80min.long.long.long.MPaMPa%HC260LA1.0480240-310340-42027HC300LA1.0489280-360370-47024HC340LA1.0548320-4

11、10400-50022HC380LA1.0550360-460430-55020HC420LA1.0556400-500460-58018NOTE 1 MPa 二 1 N/mm2.a If the yield strength is pronounced the values apply to the lower yie d point (R).b When the thickness is less than or equal to 07 mm and greater than 0,5 mm, theminimum value forelongation is reduced by 2 un

12、its.5.5 Surface characteristics5.5.1 GeneralThe surface properties cover surface quality and surface finish.5.5.2 Surface quality5.5.2.1 Products of rolled width A 600 mmThe products are supplied with one of the surface qualities A or B as defined in EN 10130 except for LA grades for which only surf

13、ace quality A applies.5522 Products of rolled width 600 mmThe requirements of EN 10139 apply.5.5.3 Surface finish5.5.3.1 Products of rolled width 2 600 mmThe requirement of EN 10130 apply.5.5.3.2 Products of rolled width 600 mm are those given in EN 10131; those of products in rolled widths 600 mmTh

14、e inspection unit is 30 t or fraction of 30 t for products of the same quality and nominal thickness. When a coil exceeds 30 t, it constitutes a single inspection unit, as does its products.6.2.2 Products of rolled width 600 mmThe inspection init is 5 t or a fraction of 5 t of product of the same st

15、eel grade, same heat treatment with the same surface properties and same nominal thickness. Coils of mass exceeding 5 t shall be considered as comprising a single inspection unit.6.3 Number of testsFor each inspect!on unit, a tensile test and where appropriate, a determination of the plastic strain ratio r and the tensile strain hardening exponent n (see Table 2) in the as-delivered state shall be carried out. In the case of bake hardening steels, further tensile tests shall be carried out (see 6.5.3).6.4 S