Production method of binding strap with tensile strength more than or equal to 1000MPa

A production method and tensile strength technology, which can be used in heat treatment equipment, furnaces, quenching agents, etc., to solve problems such as low work efficiency, fire accidents, and easy residues.

Active Publication Date: 2015-09-02
宝武轻材(武汉)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this process also has an obvious disadvantage: a small amount of oil is likely to remain on the surface of the steel strip after quenching, which is difficult to clean and will affect the surface quality of the product; at the same time, the residual oil is also prone to burning during tempering, causing a fire ACCIDENT
However, this process also has a disadvantage: the cooling ability of the molte

Method used

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  • Production method of binding strap with tensile strength more than or equal to 1000MPa
  • Production method of binding strap with tensile strength more than or equal to 1000MPa

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Embodiment Construction

[0021] The present invention is described in detail below:

[0022] Table 1 is the cold rolling and strip making process parameter list of each embodiment of the present invention and comparative example;

[0023] Table 2 is a product performance list of each embodiment of the present invention and comparative examples.

[0024] Each embodiment of the present invention is all produced according to the following process:

[0025] 1) Carry out 8 or 9 passes of cold rolling to the 30Mn2 hot rolled coil after pickling, and the total cold rolling reduction rate is controlled at 71~83%;

[0026] 2) After uncoiling, slitting and deburring, carry out high-temperature austenitization, the austenitization temperature is controlled at 930~970 °C, and the time is controlled at 20~30 s;

[0027] 3) Quenching is carried out, the cooling rate is controlled to be 80~130 °C / s, the time is controlled to be 35~55 s, and the quenching medium is a mixed solution composed of Triton X-100, Tween 2...

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Abstract

The invention discloses a production method of a binding strap with tensile strength more than or equal to 1000MPa. The method comprises the following steps: cold-rolling a pickled 30Mn2 hot-rolled coil; uncoiling, stripping and removing burrs, and then carrying out high temperature austenitizing; quenching the coil in a mixed solution consisting of triton X-100, Tween 20 and water; washing with water as conventional means and tempering the coil; naturally air-cooling to room temperature; and coiling. A finished product of the invention is 0.8-1.0mm thick, 1030-1070MPa in tensile strength, 10-12% in elongation rate and no less than 4 times in repeated bending time, and a blue layer which is uniform and dense, strong in adhesive force and 4-6microns thick is generated on the surface. The performances of the finished product completely meet the demands of binding and packaging heavy-coil hot-rolled steel coils.

Description

technical field [0001] The invention relates to a production method of a strap, in particular to a production method of a strap with a tensile strength ≥ 1000 MPa. Background technique [0002] Ultra-high-strength strapping is a high-value-added cold-rolled deep-processing product, which is widely used in bundling and packaging of large and heavy hot-rolled steel coils. Generally, it should have "tensile strength not less than 980 MPa, elongation not less than 10%, the number of repeated bending is not less than 4 times (R=2.5 mm), and the surface forms a layer with a certain thickness, strong adhesion, uniform and dense bluish layer "and so on. [0003] Generally speaking, due to the large scale of heavy hot-rolled steel coils on the surface, they only need to be bundled with blued straps to reduce packaging costs. At the same time, due to its heavy weight, the straps need to have high strength, plasticity and toughness to prevent the straps from breaking during bundling. ...

Claims

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Application Information

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IPC IPC(8): C21D8/02C21D1/60C21D9/52
Inventor 黄菲柳俊匡伟张兆丽张建国李青丽刘占增余晓静
Owner 宝武轻材(武汉)有限公司
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