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Low-carbon martensite steel and method for preparing flying ring using same

A technology of martensitic steel and lifting rings, which is applied in the field of material preparation, can solve problems such as not being able to meet the service conditions of oil drilling and production equipment, and achieve high strength, good low temperature toughness, and easy processing

Inactive Publication Date: 2014-02-12
BAOJI PETROLEUM MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a low-carbon martensitic steel, which solves the problem that the mechanical properties of existing high-strength steels under the conditions of quenching and tempering heat treatment, especially the low-temperature toughness, cannot meet the service conditions of petroleum drilling equipment

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  • Low-carbon martensite steel and method for preparing flying ring using same
  • Low-carbon martensite steel and method for preparing flying ring using same
  • Low-carbon martensite steel and method for preparing flying ring using same

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Embodiment Construction

[0017] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] The low-carbon martensitic steel of the present invention is used for making oil drilling rings, and is composed of the following components according to Wt%: 0.19≤C≤0.24, Si≤0.37, P≤0.015, S≤0.015, 2≤Mn≤ 2.4, 0.7≤Cr≤1, 1.4≤Ni≤1.7, 0.4≤Mo≤0.5, 0.07≤V≤0.12, the rest are Fe, and the total is 100%.

[0019] The microstructure factors of the low carbon martensitic steel of the present invention are: dislocation substructure, martensite strip size, martensite strip thickness; ε-carbide, substitutional solid solution and interstitial solid solution. The occurrence of the first type of temper brittleness in low carbon martensitic steels has shifted to temperatures above 400°C. When its quenched martensite structure is tempered in the temperature range below 350℃, the change trend of tensile strength and notch impact toughness AK and fracture t...

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Abstract

The invention discloses low-carbon martensite steel. The low-carbon martensite steel comprises the following components by weight percent: greater than or equal to 0.19 and less than or equal to 0.24 of C, less than or equal to 0.37 of Si, less than or equal to 0.015 of P, less than or equal to 0.015 of S, greater than or equal to 2 and less than or equal to 2.4 of Mn, greater than or equal to 0.7 and less than or equal to 1 of Cr, greater than or equal to 1.4 and less than or equal to 1.7 of Ni, greater than or equal to 0.4 and less than or equal to 0.5 of Mo, greater than or equal to 0.07 and less than or equal to 0.12 of V, and the balance of Fe, wherein the components are 100% in total. The invention also discloses a method for preparing a flying ring by using the low-carbon martensite steel. The low-carbon martensite steel not only guarantees high strength of the flying ring steel, but also has good low-temperature toughness, and meets the requirement that Akv(-20 DEG C) is greater than or equal to 42J in API Spec8C and SY / T5035. Under the premise of not changing the original design paper and original forging technology, the low-carbon martensite steel can be processed into conventional flying rings (less than 500 tons) meeting the low-temperature property requirement of the API8C and SY / T5035, is easy to process, and is suitable for industrial volume production.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and is used for making high-strength and toughness suspension ring products in API Spec8C, relates to a low-carbon martensitic steel, and also relates to a method for preparing suspension rings by using the low-carbon martensitic steel. Background technique [0002] The hoisting ring is a key component in the traveling hoisting system of the oil rig equipment. The steel used in the current hoisting ring products is 20SiMn2MoVA and 20Cr2Ni4. In different operating environments, the use of drilling rig parts is also different, especially in some cold regions, the low temperature performance requirements of drilling rig parts are higher, and the most critical mechanical index is low temperature impact toughness. In the environment of minus 20℃, the average impact toughness value of the existing 20SiMn2MoVA steel is less than 42J, which cannot meet the specification requirements of Akv (...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C33/04C21D8/00
Inventor 党恩余志刚刘宏亮李保峰
Owner BAOJI PETROLEUM MASCH CO LTD