Exceed clean spring steel, it is included be spun by hot-rolling easily and the field trash that burst makes little grain, and the bedspring that it gets used to cold rolling and generation to have exceedingly good and fatigue quality easily. The feature of this spring steel depends on steel wire including sulfur content to be do not be more than 10 quality the oxide field trash of % , in order to make diameter of consist in steel wire 1/4 outside outer and not less than 70 %(that width is not less than 3 μ M with the amount plan) such field trash satisfies the type below (1) , %) of quality of 80(of ＞ of CaO Al2O3 SiO2 MnO MgO... (1) .

[the right asks] one kind exceeds clean spring steel, its character depends on steel wire including sulfur content to be do not be more than 10 quality the oxide field trash of % , in order to make diameter of consist in steel wire 1/4 outside outer and width is not less than 3 μ M with the amount plan not less than such field trash of 70% satisfies the type below (1) , %) of quality of 80(of ＞ of CaO Al2O3 SiO2 MnO MgO. . . (1) and be narrated with the amount plan not less than such field trash of 70% also consist in is in below (A) ～ (the definitive in C) two or in 3 composition area, (A)SiO2: 40 ～ 70% , al2O3: 0 ～ 20% , caO: 20 ～ 60% (B)SiO2: 30 ～ 65% , al2O3: 25 ～ 50% , caO. : 10 ～ 30% (C)SiO2: 10 ～ 30% , al2O3: 25 ～ 50% , caO: 30 ～ 55% among them, % show quality % , premise is: "The width of field trash " the diameter that expresses every field trash, this diameter is to be used in the field trash that observes on the cross section that contains steel wire x-axis to be in what perpendicular Yu Jichang determines on axial direction, be in (A) ～ (the content in C) , with quality % plan, by normalization, in order to make the total content of 3 constituent SiO2, Al2O3 and CaO is equal to 100% .

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