Inoculator for large-diameter cylinder jacket

Abstract

The invention discloses an inoculator for a large-diameter cylinder jacket, which is prepared from the following raw materials in percentage by mass: 52-58% of Si, 7-8% of Re, 8-10% of Ca, 7-8% of Ba, 1-1.5% of Al and the balance of Fe. The inoculator has the characteristics of high efficiency and long acting; by using the inoculator, the tensile strength of the cylinder jacket body is greater than or equal to 250 MPa, the elongation percentage is greater than or equal to 0.4%, and the hardness is 180-230HB; and meanwhile, the cylinder jacket body can satisfy the technical requirements of customers for cylinder jackets.

Description

technical field [0001] The invention relates to an inoculant for cast iron, in particular to an inoculant for a cylinder liner with a large bore. Background technique [0002] The large-bore cylinder liner is a thick and large-section casting. The thickness of the test part is 180-245mm, and the material requirements are high. B&W's requirements for the mechanical properties of the cylinder liner body are: tensile strength ≥ 245MPa, elongation ≥ 0.3%, hardness 180-230HB ; Wartsila's requirements for the mechanical properties of the cylinder liner body are: tensile strength ≥ 210MPa, elongation ≥ 0.3%, hardness 180-230HB; currently used silicon-based calcium calcium inoculants (about 14% calcium), silicon The calcium-based barium inoculant (containing about 4% barium and about 5% calcium) cannot meet the technical requirements. In order to achieve the mechanical performance index, the inoculant is required to be both efficient and long-acting. Contents of the invention ...

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Problems solved by technology

[0002]Large-bore cylinder liner is a thick and large-section casting. The thickness of the test part is 180-245mm, and the material requirements are high. Tensile strength ≥ 245MPa, elongation ≥ 0.3%, hardness 180-230HB; Wartsila's requirements for the mechanical properties of the cylinder liner body are: tensile strength ≥ 210MPa, elongation ≥ 0.3%, hardness 180-230HB; currently used silicon Silicon-based calcium inoculants (about 14% calcium content) and silicon-based calcium-barium inoculants (about 4% barium content and about 5% calcium content) cannot meet the technical requirements

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