Cold heading steel ML45Mn2 hot-rolled wire rod for 10.9-grade railway locomotive high-strength pulling rivet and production method thereof
A technology for railway locomotives and production methods, which is applied in the field of cold heading steel, and can solve problems such as unfavorable preparation of blind rivets and failure to meet the performance requirements of high-strength blind rivets for class 10.9 railway locomotives.
Active Publication Date: 2020-08-07
MAANSHAN IRON & STEEL CO LTD
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Problems solved by technology
When the tensile strength of the wire rod is 840-880MPa, the elongation (A) is 18-23.5%, and the area shrinkage is 46-54%, the various properties of the finished rivets prepared from it can meet the standards, and can ensure the use When the permanent connection is completed during the process, the installation port of the blind rivet is neat and even. If the performance of the wire rod is not within this performance range, it will be unfavorable to the preparation of the blind rivet
[0004] However, the cold heading steel hot-rolled wire rod prepared in the prior art cannot meet the above requirements. In the prior art, the medium carbon alloy cold heading steel ML40Cr is mostly used to produce the cold heading steel hot-rolled wire rod. The performance of the wire rod produced in this way is It can only meet the performance requirements of commercial fastener products, but cannot meet the performance requirements of 10.9 high-strength rivets for railway locomotives
At present, there is no production method for cold-heading steel hot-rolled wire rods that can be used to produce high-strength rivets for railway locomotives
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[0031] The present invention will be described in detail below in conjunction with examples.
[0032] The chemical composition and weight percent of the cold heading steel hot-rolled wire rod for high-strength blind rivets of railway locomotives in each embodiment and comparative example are as shown in table 1, and it is iron and other unavoidable impurities, and in the embodiment all Control residual elements Cr≤0.20%, Ni≤0.20%, Cu≤0.20%, Mo≤0.10%.
[0033] Table 1 embodiment and comparative example chemical composition
[0034]
[0035] The production method of the cold heading steel hot-rolled wire rod for high-strength rivets of railway locomotives in each embodiment and comparative example is as follows: electric arc furnace or converter smelting→LF furnace refining→RH or VD vacuum degassing→Φ380mm~Φ500mm round billet continuous Casting → rolling 150mm×150mm billet → skinning and finishing → billet heating → thermomechanical rolling in high-speed wire rod mill → slow...
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Abstract
The invention discloses a cold heading steel ML45Mn2 hot-rolled wire rod for 10.9-grade railway locomotive high-strength pulling rivets and a production method thereof. The steel comprises the following chemical components of, in percentage by weight, 0.42%-0.49% of C, 0.17%-0.37% of Si, 1.40%-1.80% of Mn, less than or equal to 0.20% of Cr, less than or equal to 0.20% of Ni, less than or equal to0.20% of Cu, less than or equal to 0.10% of Mo, less than or equal to 0.025% of P, less than or equal to 0.025% of S, less than or equal to 1.5 ppm of H, and the balance Fe and other inevitable impurities. The tensile strength of the hot-rolled wire rod produced by the method is 840-880 MPa, the elongation (A) is 18%-23.5%, the area reduction rate is 46%-54%, and various properties of a rivet finished product produced by the hot-rolled wire rod meet the requirements of the 10.9-grade railway locomotive high-strength rivets.
Description
technical field [0001] The invention belongs to the technical field of cold heading steel, and in particular relates to a cold heading steel ML45Mn2 hot-rolled wire rod for high-strength rivets of 10.9 grade railway locomotives and a production method thereof. Background technique [0002] Cold heading steel is mainly used to produce bolts, screws, nuts, rivets and other fasteners. my country's railway construction has maintained rapid development. Not only new railways and existing lines have been reconstructed, but new high-speed EMUs, high-power locomotives and heavy-duty trucks Market demand, and the upgrading of in-service equipment also provides market space for blind rivet fasteners. With the development of the rail transit industry, higher requirements are put forward for cold heading steel for high-strength rivet fasteners. It is of great significance to develop and produce cold heading steel for high-strength rivets for railway locomotives to meet the high-strength ...
Claims
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IPC IPC(8): B21B1/16B21C37/04C22C38/02C22C38/04C22C38/08C22C38/16C22C38/12C22C38/40C22C38/38C22C38/22C22C38/20C22C38/58C22C38/44C22C38/42C21D8/06
CPCB21B1/16B21C37/045C22C38/02C22C38/04C22C38/08C22C38/16C22C38/12C22C38/40C22C38/38C22C38/22C22C38/20C22C38/58C22C38/44C22C38/42C21D8/065C21D2211/009C21D2211/005
Inventor宋强龚志翔于同仁高振波完颜卫国姜婷彭进明尹德福孙凯葛晴晴柯鹏张晓瑞吴建曦丁新军袁月明
OwnerMAANSHAN IRON & STEEL CO LTD