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Carbon alloy steel in SiMnNiMoV system, lifting ring of drilling machine, and manufacturing method of lifting ring

A technology of carbon alloy steel and manufacturing method, which is applied in the field of drilling rig suspension rings and its manufacture, SiMnNiMoV series medium carbon alloy steel, which can solve the problems of suspension ring steel toughness and plasticity limitations, difficulty in significantly improving, high manufacturing cost, etc., and achieve the elimination of residual stress , Reduce the electroslag remelting link, avoid the effect of temper brittleness

Inactive Publication Date: 2021-01-29
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, low-carbon martensitic steels such as 20SiMn2MoV and 20Cr2Ni4 are mainly used in the manufacture of lifting rings. Since the impact energy value of 20SiMn2MoV at -20°C is less than 42J, it cannot be used at low temperatures. 20Cr2Ni4 materials are suitable for manufacturing diameters smaller than The low temperature toughness of the 120mm lifting ring can meet the requirements, but it is difficult to grind, the production efficiency is low, and the manufacturing cost is high
According to comprehensive analysis, the steel used for lifting rings of drilling rigs is mainly low-carbon martensitic steel at present, and the martensitic structure is obtained by quenching + low-temperature tempering process, so as to ensure the high strength of the material. However, in this heat treatment state, the toughness and The plasticity is limited to a certain extent, and it is difficult to significantly improve it, and the martensitic structure is more sensitive to the corrosion environment, and the increasingly complex drilling environment poses a serious challenge to the service safety of the lifting ring

Method used

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  • Carbon alloy steel in SiMnNiMoV system, lifting ring of drilling machine, and manufacturing method of lifting ring
  • Carbon alloy steel in SiMnNiMoV system, lifting ring of drilling machine, and manufacturing method of lifting ring
  • Carbon alloy steel in SiMnNiMoV system, lifting ring of drilling machine, and manufacturing method of lifting ring

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method of manufacturing a suspension ring, comprising the steps of:

[0034] (1) carry out refining by the medium carbon steel of embodiment 1 in table 1, obtain 700mm diameter billet ingot, by mass percentage, the medium carbon steel of embodiment 1 comprises following component:

[0035] C: 0.25%; Si: 1.1%; Mn: 1.0%; Cr: 0.3%; Mo: 0.5%; Ni: 2.3%; P: 0.01%, [H]: 1ppm, the rest is iron and unavoidable impurities;

[0036] (2) Heating the billet ingot to 1250°C for forging, the forging termination temperature is controlled at 900°C, and the round steel with a diameter of 340-348mm is obtained by forging. After the forging is completed, when the surface temperature drops to 450°C, furnace cooling is carried out;

[0037] (4) The round steel is reheated to 1250°C for forging, the forging termination temperature is controlled at 900°C, and a suspension ring sample with a diameter of 130-140mm is obtained;

[0038] (5) Heat the suspension ring sample to 970°C, keep it wa...

Embodiment 2

[0041] A method of manufacturing a suspension ring, comprising the steps of:

[0042] (1) carry out refining by the medium carbon steel of embodiment 2 in table 1, obtain 800mm diameter billet ingot, by mass percentage, the medium carbon steel of embodiment 2 comprises following component:

[0043] C: 0.28%; Si: 0.9%; Mn: 0.8%; Cr: 0.2%; Mo: 0.6%; Ni: 2.4%; P: 0.006%, [H]: 0.5ppm, and the rest are iron and unavoidable impurities.

[0044] (2) Heating the billet ingot to 1260°C for forging, the forging termination temperature is controlled at 900°C, and the round steel with a diameter of 345-350 mm is obtained by forging. After the forging is completed, when the surface temperature drops to 460°C, the furnace cold;

[0045] (4) Reheat the round steel to 1260°C for forging, the forging termination temperature is controlled at 900°C, and a ring sample with a diameter of 135-145mm is obtained by forging;

[0046] (5) Heat the suspension ring sample to 950°C, keep it warm for 4 ...

Embodiment 3

[0049] A method of manufacturing a suspension ring, comprising the steps of:

[0050] (1) carry out refining by the medium carbon steel of embodiment 3 in table 1, obtain the billet ingot of 800mm diameter, by mass percentage, the medium carbon steel of embodiment 3 comprises following component:

[0051] C: 0.26%; Si: 1.1%; Mn: 1.1%; Cr: 0.1%; Mo: 0.52%; Ni: 2.1%; P: 0.008%, [H]: 0.8ppm, the rest is iron and unavoidable impurities;

[0052] (2) Heating the steel billet ingot to 1240°C for forging, the forging termination temperature is controlled at 900°C, and the round steel with a diameter of 342-346mm is obtained by forging. After the forging is completed, the surface temperature is reduced to 455°C for furnace cooling;

[0053] (4) The round steel is reheated to 1240°C for forging, the forging termination temperature is controlled at 900°C, and a suspension ring sample with a diameter of 140-150mm is obtained by forging;

[0054] (5) Heat the suspension ring sample to 9...

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Abstract

The invention discloses carbon alloy steel in an SiMnNiMoV system, a lifting ring of a drilling machine, and a manufacturing method of the lifting ring, and belongs to the field of petroleum equipmentmanufacturing. According to the manufacturing method of the lifting ring of the drilling machine, synergistic cooperation of steel chemical components is controlled, so that the hardenability of steel used for the lifting ring is greatly improved; water is used as a cooling medium for high-temperature quenching in the heat treatment process, so that a martensitic structure is formed in the wholesection in the quenching process of the large-section lifting ring with the diameter of 130-150 mm, and deformation is small; to provide a condition for the high tenacity of the lifting ring, medium-temperature tempering at 550+ / - 20 DEG C is adopted so that residual stress formed in the quenching process can be sufficiently eliminated, a tempered structure with high tenacity is obtained and improved, and temper brittleness is effectively avoided.

Description

technical field [0001] The invention belongs to the field of petroleum equipment manufacturing, in particular to a SiMnNiMoV series medium carbon alloy steel, a drilling rig suspension ring and a manufacturing method thereof. Background technique [0002] The lifting ring is an important lifting component of the oil drilling rig. It is a solid bar forging and mainly bears tensile load and fatigue load. With the popularization and application of ultra-deep well drilling rigs, the requirements for the lifting capacity of the lifting ring are getting higher and higher, and the diameter of the lifting ring is getting larger and larger. In order to ensure the overall service safety of the lifting ring, it is required that its entire section have consistent mechanical properties, especially the center position The material has high strength and toughness, which requires the steel for the ring to have sufficient hardenability and toughness. [0003] At present, low-carbon martensi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48B21J5/00C21D9/40C22C33/04
CPCB21J5/002C21D9/40C22C33/04C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48
Inventor 李方坡
Owner BC P INC CHINA NAT PETROLEUM CORP
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