Low-carbon multi-element micro-alloyed multipurpose high-strength and high-toughness structural steel

A micro-alloying, high-strength and toughness technology, applied in the field of low-carbon multi-component micro-alloying multi-purpose high-strength and toughness structural steel, can solve the problems that the strength cannot meet the design requirements, can not fully meet the requirements, and the performance limitations of thick-walled parts, and achieve heat treatment. The effect of reliable performance, less risk of heat treatment process and low heat treatment cost

Inactive Publication Date: 2016-08-31
GUIZHOU GAOFENG GASOLINEEUM MACHINERY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Drilling tools have the characteristics of large cross-section and large wall thickness. Under the background of deeper drilling depth and more complex geological conditions, the widely used 40CrMnMo and 4145H with high hardenability can no longer fully meet the demand
The disadvantage of 40CrMnMo and 4145H is that for thick-walled parts, there is still a risk of quenching cracks due to water quenching. When the wall thickness is large, especially when there are different sections and the wall thickness difference is large, the performance of the thick-walled part is often It must be limited; for solid large cross-section parts, often due to the limitation of hardenability and the influence of comprehensive stress in the quenching process, the mechanical properties are unstable or the strength cannot meet the design requirements or the impact energy is not up to standard, and even quenching cracks risks of

Method used

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  • Low-carbon multi-element micro-alloyed multipurpose high-strength and high-toughness structural steel
  • Low-carbon multi-element micro-alloyed multipurpose high-strength and high-toughness structural steel
  • Low-carbon multi-element micro-alloyed multipurpose high-strength and high-toughness structural steel

Examples

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Embodiment 1

[0018] In this example, the mechanical properties of the parts processed from the low-carbon multi-element microalloyed multi-purpose high-strength and toughness structural steel of the present invention are shown in Table 1 after heat treatment:

[0019]

[0020] It can be seen from Table 1 that the performance characteristics of Gaofeng No. 2 steel quenched and tempered are:

[0021]

[0022] 1. Whether it is a 40-75 thick-walled part or a solid part with a diameter of 130-235, the performance of sampling at a distance of 25.4mm from the surface exceeds the requirements of API standards and industry standards, and reaches (yield strength 827-964MPa, resistance to Tensile strength 965-1033MPa, impact energy 90J) oilfield users special requirements, especially the performance of 75mm thick-walled parts at a depth of 37.5mm from the surface has also reached (yield strength 827-964MPa, tensile strength 965-1033MPa, impact energy 90J) high requirements. It fully shows that...

Embodiment 2

[0026] This example is to use the low-carbon multi-element microalloyed multi-purpose high-strength and toughness structural steel of the present invention to make mechanical jar slips. The performance data is shown in Table 2:

[0027]

[0028] As a comparison, the performance data of the original technology using 35CrMo to manufacture the slips of the mechanical jar while drilling is shown in Table 3:

[0029]

[0030] It can be seen from Table 2 and Table 3 that when the slips made of 35CrMo are tempered at 500 degrees, the surface hardness is the same as that of foreign slips (47, 48HRC); because the core structure of slips made of 35CrMo has more non-martensite The transformation product, the impact energy is not high enough (49J), which is prone to brittle fracture. When the impact energy is increased by increasing the tempering temperature and sacrificing the surface hardness, the surface hardness at this time can no longer meet the wear resistance requirements, an...

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Abstract

The invention discloses low-carbon multi-element micro-alloyed multipurpose high-strength and high-toughness structural steel. The structural steel is characterized by being formed by smelting 0.22-0.31 part of carbon (C), 0.15-0.30 part of silicon (Si), 0.45-0.85 part of manganese (Mn), 1.10-1.40 parts of chromium (Cr), 0.45-0.75 part of molybdenum (Mo), nickel (Ni) smaller than or equal to 0.25 part, copper (Cu) smaller than or equal to 0.25 part, sulfur (S) smaller than or equal to 0.005 part, phosphorus (P) smaller than or equal to 0.015 part, 0.02-0.10 part of vanadium (V), titanium (Ti) smaller than or equal to 0. 01 part, 0.02-0.05 part of niobium (Nb), 0.001-0.003 part of boron (B) and the balance iron by weight. According to the low-carbon multi-element micro-alloyed multipurpose high-strength and high-toughness structural steel, the heat processing technology risk is small and the rejection rate is low; the heat processing performance is more reliable, and the heat processing cost is lower; clean and civilized production can be realized. The multi-element micro-alloyed multipurpose high-strength and high-toughness structural steel can serve as carburizing steel; the surfaces of parts can have enough abrasive resistance through quenching and high-temperature tempering after carburization, and base bodies have good toughness.

Description

technical field [0001] The invention relates to a low-carbon multi-element micro-alloyed multi-purpose high-strength and toughness structural steel, which belongs to the technical field of metal materials and heat treatment processes thereof. Background technique [0002] Drilling tools have the characteristics of large cross-section and large wall thickness. Under the background of deeper drilling depth and more complicated geological conditions, 40CrMnMo and 4145H, which are currently widely used with high hardenability, can no longer fully meet the demand. The disadvantage of 40CrMnMo and 4145H is that for thick-walled parts, there is still a risk of quenching cracking due to water quenching. To be limited; for solid large-section parts, the mechanical properties are unstable or the strength cannot meet the design requirements or the impact power is not up to the standard due to the limitation of hardenability and the influence of the comprehensive stress of the quenching...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/12C22C38/16C22C38/14C22C38/04C22C38/02C22C38/08
CPCC22C38/18C21D2211/008C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14C22C38/16C22C38/32
Inventor 王观礼张亚昌伍玉娇张超梁柔韩冰冰
Owner GUIZHOU GAOFENG GASOLINEEUM MACHINERY
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