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A kind of medium manganese low carbon martensitic steel, ultra-deep drilling rig lifting ring and preparation method thereof

A martensitic steel, ultra-deep well technology, applied in the field of petroleum equipment manufacturing, can solve problems such as low production efficiency, inability to meet use requirements, difficult grinding, etc. The effect of improving low temperature toughness and processability

Active Publication Date: 2022-01-04
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

At present, the materials used in the manufacture of lifting rings mainly include 20SiMn2MoV and 20Cr2Ni4. Since the impact energy value of 20SiMn2MoV at -20°C is less than 42J, it cannot be used at low temperature. It can meet the requirements, but grinding is more difficult and the production efficiency is lower
According to comprehensive analysis, the current steel for drilling rig suspension rings can meet the requirements for suspension ring products with a diameter of less than 120mm, but for suspension ring products with a cross-sectional diameter of 150mm or even larger diameters for ultra-deep well drilling rigs with a depth of 9000m and above, the current materials can no longer meet the use requirements

Method used

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  • A kind of medium manganese low carbon martensitic steel, ultra-deep drilling rig lifting ring and preparation method thereof
  • A kind of medium manganese low carbon martensitic steel, ultra-deep drilling rig lifting ring and preparation method thereof
  • A kind of medium manganese low carbon martensitic steel, ultra-deep drilling rig lifting ring and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0038] The invention discloses a preparation method of a suspension ring, which specifically comprises the following steps:

[0039] (1) As shown in Table 1, the steel billet is refined according to the following composition, and its composition is calculated by mass percentage, including the following components:

[0040] C: 0.18%; Si: 0.65%; Mn: 1.65%; Cr: 0.9%; Mo: 0.5%; Ni: 1.8%; Avoid impurities.

[0041] (2) Electroslag remelting is performed on the steel billet to obtain an ingot with a diameter of 690mm, and the ingot is heated evenly to 1200°C for forging, the final forging temperature is controlled above 880°C, and a round steel with a diameter of 350mm~360mm is obtained by forging After forging, the surface temperature is lowered to 400°C and annealed in the furnace;

[0042] (4) Reheat the round steel to 1200°C for forging, the final forging temperature is controlled above 880°C, and the ring sample with a diameter of 150mm is obtained by forging;

[0043] (5) H...

Embodiment 2

[0046] The invention discloses a preparation method of a suspension ring, which specifically comprises the following steps:

[0047] (1) As shown in Table 1,

[0048] Refined into billets according to the following composition, its composition is calculated by mass percentage, including the following components:

[0049] C: 0.21%; Si: 0.85%; Mn: 1.85%; Cr: 1.1%; Mo: 0.6%; Ni: 2.1%; V: 0.25%; Avoid impurities.

[0050] (2) Electroslag remelting is performed on the steel billet to obtain an ingot with a diameter of 870mm, and the ingot is heated evenly to 1210°C for forging, the termination temperature of forging is controlled above 860°C, and a circle with a diameter of 350mm~360mm is obtained by forging For steel, after forging, the surface temperature is lowered to 450°C and annealed in the furnace;

[0051] (4) Reheat the round steel to 1200°C for forging, the final forging temperature is controlled at 880°C, and forge a ring sample with a diameter of 140mm;

[0052] (5)...

Embodiment 3

[0055] The invention discloses a preparation method of a suspension ring, which specifically comprises the following steps:

[0056] (1) As shown in Table 1, the steel billet is refined according to the following composition, and its composition is calculated by mass percentage, including the following components:

[0057] C: 0.19%; Si: 0.71%; Mn: 1.85%; Cr: 1.0%; Mo: 0.56%; Ni: 2.1%; V: 0.21%; Avoid impurities.

[0058] (2) Electroslag remelting is performed on the steel billet to obtain an ingot with a diameter of 690mm, and the ingot is heated evenly to 1210°C for forging, the termination temperature of forging is controlled above 860°C, and a circle with a diameter of 350mm~360mm is obtained by forging For steel, after forging, the surface temperature is lowered to 420°C and annealed in the furnace;

[0059] (4) Reheat the round steel to 1210°C for forging, the final forging temperature is controlled at 880°C, and forge a ring sample with a diameter of 145mm;

[0060] (...

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Abstract

The invention belongs to the field of petroleum equipment manufacturing, and specifically discloses a medium-manganese low-carbon martensitic steel, which comprises the following components in terms of mass percentage: C: 0.18-0.21%, Si: 0.65-0.85%, Mn: 1.65- 1.85%, Cr: 0.9~1.1%, Mo: 0.5‑0.6%, Ni: 1.8~2.1%, V: 0.21~0.25%, S≤0.005% and P≤0.01%, the rest are iron and unavoidable impurities, Has high strength and toughness. The invention also discloses an ultra-deep well drilling rig suspension ring prepared by using the medium-manganese low-carbon martensitic steel, the diameter of which can reach 150 mm, and meets the use requirements of the ultra-deep well drilling rig suspension ring. The invention also discloses a preparation method of the suspension ring of the ultra-deep well drilling rig, which has low cost and short manufacturing period.

Description

technical field [0001] The invention belongs to the field of petroleum equipment manufacturing, and in particular relates to a medium-manganese low-carbon martensitic steel, an ultra-deep well drilling rig suspension ring and a preparation 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. At present...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/58C22C38/44C22C38/46C21D1/18C21D8/06
CPCC22C38/02C22C38/58C22C38/44C22C38/46C22C38/002C21D1/18C21D8/065C21D2211/008
Inventor 李方坡
Owner BC P INC CHINA NAT PETROLEUM CORP
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