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24320065PhysicsExaminationandTestingVol.24,No.3May.2006:(19692),,,;E2mail:xiaomeliu@126.com;:2005212201Z,(,250101):Q345B,Z(z),Z:Q345B;;Z:TG115.21:A:100120777(2006)0320026203DependenceofZ2directionSectionShrinkageonPlasticInclusionLevelLIUXiao2mei,GAOFeng(JinanIronSteelCoLtd,Jinan250101Shandong,China)Abstract:TheQ345Bslabswithdifferentheatsandbatcheswererolledinthetestmill.Therelationshipofthelev2elofplasticinclusionsandthez2directionsectionshrinkagewasalsostudied.Theresultsshowedthatthequanti2ty,sizeandshapeoftheplasticinclusionswouldplaythedecisiveeffecttothez2directionsectionshrinkage.Keywords:Q345B;plasticinclusions;z2directionsectionshrinkage,,Z,Q345B,Z1200mm()1600mm()Q345B,(,%)1100mm()100mm()260()mm,,450,:::100mm86mm71mm57mm;:57mm46mm37mm30mm25mm::11001150;:1h1Table1Compositionofexperimentalsteel%CSiMnPSAlV0135550.170.341.580.0150.0150.0090.0180243300.160.361.600.0180.0080.0110.0190343170.170.341.520.0170.0180.0100.0160443290.160.361.570.0200.0090.0110.0190543250.160.301.570.0210.0120.0110.022:10501100;880,Z1(3),20mm20mm,4%,GX71IA32XL230;Z,,,,GB5313285,,1.5,25mm,6mm200kNC220A22,,WAW2Y50022.1Z22.2Z2,,03051,ADz22(a)ABC;2(b)A;2(c)(AC)2,z,5,,Zz;z2.3,,Z[1],,,,2ZTable2Microstructureandz///z/%0183A2.5,B1.5,C2.0A50.440282A2.0,B1.5,C2.0,D1.0A55.560381.5A2.5,C2.5A42.910481.5A2.0,B1.0,C2.5,D1.5A570581A1.0,B2.0,C1.5,D1.5BC,A65.59(a)03;(b)051Fig.1Distributionofinclusionforsample03(a)andsamlpe05(b)(a);(b);(c)2zFig.2Relationshipbetweenzandinclusionlevel723:Z2,,Z,,,Z,,Z2z,Bz,(AC)z,,ZZ,z[2],,,Z,(Z)z,,,,,,,,,,,z,,52.5,Z3(1),Z(2)(AC)z,:52.5,Z:[1].[M].:,1986.[2].[M].:,1991.(23)3,,20%80%,,:[1].[M].:,1987.[2],.[J].,2003,37(12):183121834.[3],,,.[J].,2002,23(4):125.[4],,.[J].,1999,35(11):112521129.[5].[M].:,1987.8224