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Alloy steel, retained mandrel and production method of retained mandrel

A technology of limiting mandrel and production method, which is applied in the field of alloy steel, can solve the problems of high manufacturing cost, and achieve the effects of reducing material cost, high purity, and reducing residual stress

Inactive Publication Date: 2015-10-28
SHANDONG MOLONG PETROLEUM MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, H13 (4Cr5MoSiV1) steel is usually used as the main body 100 of the stop mandrel, and the cost per ton is about 33,000 yuan. About RMB, the manufacturing cost is higher

Method used

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  • Alloy steel, retained mandrel and production method of retained mandrel
  • Alloy steel, retained mandrel and production method of retained mandrel
  • Alloy steel, retained mandrel and production method of retained mandrel

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Embodiment Construction

[0054] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0055] A kind of alloy steel, the mass percent content of each component of the alloy steel is as follows: C is 0.27-0.31%, Si is 0.60-0.80%, Mn is 0.7-0.9%, P≤0.015%, S≤0.005%, Cr is 3.50-3.70%, Ni 0.20-0.30%, V 0.40-0.50%, Mo 0.50-0.58%, Al≤0.025%, and the rest are iron and impurity elements.

[0056] Silicon (Si) in the above-mentioned alloy steel can be dissolved in ferrite and austenite to increase the hardness and strength of steel, and silicon can improve the elastic limit, yield strength and yield ratio of steel, as well as fatigue strength and fatigue ratio; manganese ( Mn) is a good deox...

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Abstract

The invention discloses alloy steel and belongs to the technical field of continuous rolling units. The alloy steel comprises components in percentage by mass as follows: 0.27%-0.31% of C, 0.60%-0.80% of Si, 0.7%-0.9% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.005% of S, 3.50%-3.70% of Cr, 0.20%-0.30% of Ni, 0.40%-0.50% of V, 0.50%-0.58% of Mo, smaller than or equal to 0.025% of Al and the balance of iron and impurity elements. The invention discloses a retained mandrel adopting the alloy steel. The retained mandrel comprises a plug, a connecting rod and a hollow cylindrical retained mandrel body. The invention further discloses a production process for manufacturing the retained mandrel. The process comprises steps of steel making, rolling, heat treatment, machining and assembling. On the premise that the use requirements are met and the product quality is guaranteed, the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of continuous rolling mills, and in particular relates to an alloy steel, a stop mandrel using the alloy steel, and a production method for manufacturing the stop mandrel. Background technique [0002] The stop mandrel of the continuous rolling mill is an important rolling tool for hot deformation in the field of hot-rolled seamless steel pipe production. The cooling platform is sprayed with water to cool it down to 100±20°C, and it will be put online again quickly for recycling. [0003] Such as figure 1 As shown, a stop mandrel disclosed in the prior art includes a stop mandrel body 100, one end of the stop mandrel body 100 is provided with an axially extending internal thread 101, and the other end is provided with a tapered guide part 102 , the stop mandrel body 100 is a solid structure. At present, H13 (4Cr5MoSiV1) steel is usually used as the main body 100 of the stop mandrel, and the cost per ton i...

Claims

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Application Information

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IPC IPC(8): B21B25/00C22C38/46B23P15/00
Inventor 张云三周金涛国焕然黎新春张松江藏中山
Owner SHANDONG MOLONG PETROLEUM MACHINERY
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