High-strength toughness steel for continuous sucker rod and method for manufacturing same

A technology with high strength and toughness and manufacturing method, applied in manufacturing tools, temperature control, metal rolling, etc., can solve the problems of poor strong-plastic matching, fatigue fracture, low plasticity, etc., to reduce working stress, reduce failure frequency, reduce wear and tear Effect

Inactive Publication Date: 2008-08-20
宝钢特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to provide a high-strength toughness continuous sucker rod steel and its manufacturing method, to solve the existing sucker rod strength, low plasticity and poor matching between strong and plastic, prone t

Method used

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Examples

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Embodiment Construction

[0057] See Table 2 for the examples of the present invention, and see Table 3 for the mechanical properties.

[0058] The section size is 90×90mm 2 ~360×360mm 2 Qualified continuous casting slab; rolling: In order to obtain a good rolled structure, the wire diameter is greater than φ18mm, the heating temperature is 1120-1150°C, the final rolling temperature is 820-840°C, and the temperature is 40-80°C after rolling. / h cooling rate cooling, when the wire diameter is 5mm<φ≤18mm, the heating temperature is 1150-1180°C, the final rolling temperature is 840-860°C, and the cooling rate is 40-80°C / h after rolling; the hot-rolled wire rod is annealed , annealing temperature 680 ~ 720 ℃, holding time 5 ~ 10 hours, furnace temperature ≤ 500 ℃, air cooling.

[0059] Table 2

[0060] implement

[0061] Table 3 Mechanical Properties

[0062]

[0063] 3

[0064] In summary, the wire rod steel produced by the present invention is made into continuous suck...

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PUM

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Abstract

The invention discloses steel with high strength and toughness applied in a coiled rod and a manufacturing method thereof, solving the problems of the existing coiled rods that the strength and the plasticity are low and not well matched, and fatigue crack occurs frequently. The manufacturing method comprises the following steps: 1) the chemical components of the steel by weight percentage are: 0.12-0.22 percent of C, 0.15-0.40 percent of Si, 0.30-0.60 percent of Mn, 0.20-0.40 percent of Mo, 1.30-1.95 percent of Ni, 0.40-0.60 percent of Cr, 0.20-0.35 percent of V, 0.015-0.050 percent of Al, less than or equal to 0.30 percent of Cu, less than or equal to 0.0 15 percent of S, less than or equal to 0.020 percent of P and the rest of Fe; 2) smelting, ladle refining and continuous casting to form blocker: the (O) is less than or equal to 0.0025 percent and the (H) is less than or equal to 0.00015 percent; 3) casting blank and heating: the soaking temperature is 1130-1180 DEG C, heat preservation is more than or equal to 2.5 h, and the tapping temperature is 1100-1180 DEG C; 4) control of rolling: the temperature of finishing rolling is 820-860 DEG C; 5) control of cooling: the cooling speed is 40-80 DEG C per hour. The steel of the invention improves the comprehensive mechanical performances and fatigue life of the coiled rod and fulfils the development of the petroleum industry.

Description

technical field [0001] The invention relates to the composition design and manufacturing method of structural steel in the metallurgical industry, in particular to the composition design and manufacturing method of high-strength and high-toughness continuous sucker rod steel. Background technique [0002] At present, more than 90% of oil wells on land in my country use rod pumps for oil production. Steel sucker rods are generally used, which can be divided into D-grade rods and H-grade rods according to their strength levels. The steel grades used for D-grade rods are 35Mn2, 35CrMo, and 42CrMo. The H-grade rods mainly include 12Mn2SiCr, 16Mn2SiCr, and 20Cr2MoNi. Wait. The D-grade sucker rods recommended by the American Petroleum Institute are: 1536 and 4142 (equivalent to 35Mn2 and 42CrMo steel respectively). With the rapid development of the oil production industry and many oil fields are in the late stage of production, the oil production layer is gradually lowered and t...

Claims

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Application Information

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IPC IPC(8): C22C38/46C22C33/04B21B1/46B21B37/74B22D11/16B22D27/04C21D1/26C21D11/00
Inventor 刘湘江胡俊辉黄泽民赵亚平胡洋聪骆鸿
Owner 宝钢特钢有限公司
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