矩形钢通用规格表 350X250X6.0--12.0mm 350X150X6.0--12.0mm 300X200X6.0--12.0mm 300X150X6.0--12.0mm 300X100X4.0--10.0mm 280X180X4.0--10.0mm 250X150X4.0--10.0mm 250X100X4.0--10.0mm 200X150X4.0--10.0mm 200X100X4.0--10.0mm 200X95X4.0--10.0mm 160X80X4.0--10.0mm 150X100X3.0--10.0mm 150X90X3.0--10.0mm 150X75X3.0--8.0mm 140X80X3.0--10.0mm 120X100X3.0--10.0mm 120X80X2.0--8.0mm 120X60X2.0--5.0mm 12