Wear-resisting steel for slurry delivery pipe line and production method of wear-resisting steel
A conveying pipeline and wear-resistant technology, which is applied to the steel for wear-resistant slurry conveying pipeline and its production field, can solve the problems of insufficient erosion and wear resistance, achieve good welding and forming performance, and be simple and easy to produce. Good effect of row and tissue uniformity
Inactive Publication Date: 2012-07-18
WUHAN IRON & STEEL (GROUP) CORP
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Problems solved by technology
[0008] The invention aims at the deficiencies in the erosion and wear resistance of API 5L X series commonly used steel for slurry conveying pipelines, which cannot meet the requirements of the steel for slurry conveying pipelines, etc., and provides a kind of steel with good erosion and wear resistance, strong toughness and Good weldability, high cost performance steel for slurry conveying pipeline and production method
Method used
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Embodiment Construction
[0035] The present invention will be further described below in conjunction with embodiment:
[0036] Table 1 is the chemical composition and value list of each embodiment of the present invention and comparative examples;
[0037]Each embodiment in table 1 is produced according to the following steps, and each parameter is any value within its scope:
[0038] (1) Pretreatment of molten iron: ensure that the S weight percentage content of molten iron entering the furnace is ≤0.005%;
[0039] (2) Refining outside the furnace and denaturation treatment of inclusions, and continuous casting into billets: first, process in LHF for 25 to 45 minutes, and fine-tune the alloy according to the designed target composition; perform RH vacuum treatment, according to 700 ~800 g / t steel is fed into the CaSi wire, the feeding speed is controlled to be 250~300 m / min, and the vacuum treatment time is controlled to be at least 15 minutes;
[0040] 3) Carry out controlled rolling and controlle...
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The invention relates to steel and a production method of the steel. The steel has erosion and wear resisting performances and is used for a delivery pipe line of slurry such as coal slurry and ore pulp. The steel comprises the following chemical compositions in percentage by weight: 0.04-0.16% of C, 0.15-0.25% of Si, 0.08-1.60% of Mn, 0.020-0.065% of Nb, 0.010-0.025% of Ti, 0.05-0.25% of Cu, 0.10-0.30% of Cr, not more than 0.022% of P, not more than 0.004% of S, not more than 0.43 of CEIIW, and not more than 0.21 of CEPcm. The production method comprises the following steps of: pretreatment of molten iron; external refining and denaturation of inclusions as well as continuous casting to form a blank; and rolling and cooling controlling. The steel in the invention has 450MPa grade of yield strength, and is more than 10% higher than API5LX65 (L450) steel in erosion and wear resisting performances and toughness, so that the service life of the pipeline can be prolonged by more than 10%. Furthermore, the steel has good welding and molding performances and good structural homogeneity, is low in deformation resistance during rolling and causes low loss to a rolling mill.
Description
technical field [0001] The invention relates to a steel for pipelines for conveying slurry such as coal slurry and ore slurry with erosion and wear resistance and a manufacturing method thereof. Background technique [0002] The long-distance transportation of coal, ore and other resources has always been dominated by trains, automobiles, ships and other transportation methods. These transportation methods have disadvantages such as large intermediate loss, high cost, environmental pollution and low transportation efficiency. It is subject to many restrictions such as climate and transportation capacity. [0003] Slurry pipeline transportation is a transportation method that mixes granular solid materials with liquid transportation medium, uses pump power to transport them in the pipeline, and provides slurry or dehydrated products at the destination according to user requirements. As early as the 19th century, foreign countries began to try to transport coal-water slurry a...
Claims
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Login to View More IPC IPC(8): C22C38/38C22C38/28C21D8/10C21D11/00
Inventor 孔君华李利巍崔雷刘占增杨海林杜明郭斌刘小国张鹏武郑琳
Owner WUHAN IRON & STEEL (GROUP) CORP