Unlock instant, AI-driven research and patent intelligence for your innovation.

Hydrogen sulfide stress corrosion resistant high strength steel and preparation method thereof

A stress corrosion and hydrogen sulfide resistance technology, which is applied in the field of low-carbon high-strength steel and its preparation, can solve the problems of low steel strength and only high strength, and achieve improved production efficiency, low cost, and omission of quenching and tempering heat treatment processes Effect

Active Publication Date: 2020-11-24
SHANGHAI UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent CN102373383A provides a line pipe resistant to hydrogen sulfide corrosion, which adopts the design of low-carbon composition system and micro-alloying, but its strength only reaches 70ksi level
Due to the low strength of steel, it cannot meet the needs of actual production

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Hydrogen sulfide stress corrosion resistant high strength steel and preparation method thereof
  • Hydrogen sulfide stress corrosion resistant high strength steel and preparation method thereof
  • Hydrogen sulfide stress corrosion resistant high strength steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this example, see figure 1 , a high-strength steel resistant to hydrogen sulfide stress corrosion, its composition mass percentage is implemented according to the composition shown in Table 2, wherein the composition mass percentage relationship of Ti and N elements in the constituent elements is: Ti-3.4N=0.0198%.

[0024] A preparation method of hydrogen sulfide stress corrosion resistant high-strength steel of the present invention adopts TMCP method to prepare, comprising the steps of:

[0025] According to the mass percentage of the target steel, 50 kg of steel ingots are smelted in a vacuum furnace, and forged into a square billet with a size of 180×120×200mm, which is used as a forged billet, and then the forged billet is heated and kept at 1200°C for 3 hours and then placed on a rolling mill Rolling is carried out, and the rolling passes are divided into four passes of 60-35mm, 35-25mm, 25-15mm and 15-10mm, specifically: in the first pass, the forged blank is ...

Embodiment 2

[0027] This embodiment is basically the same as Embodiment 1, especially in that:

[0028] In this embodiment, a hydrogen sulfide stress corrosion resistant high-strength steel, its composition mass percentage is implemented according to the composition shown in Table 2, wherein the relationship between the composition mass percentage of Ti and N elements in the constituent elements is: Ti-3.4N= 0.0132%.

[0029] A preparation method of hydrogen sulfide stress corrosion resistant high-strength steel of the present invention adopts TMCP method to prepare, comprising the steps of:

[0030]According to the mass percentage of the target steel, 50 kg of steel ingots are smelted in a vacuum furnace, and forged into a square billet with a size of 180×120×200mm, which is used as a forged billet, and then the forged billet is heated and kept at 1200°C for 3 hours and then placed on a rolling mill Rolling is carried out, and the rolling passes are divided into four passes of 60-35mm, 3...

Embodiment 3

[0032] This embodiment is basically the same as the previous embodiment, and the special features are:

[0033] In this embodiment, a hydrogen sulfide stress corrosion resistant high-strength steel, its composition mass percentage is implemented according to the composition shown in Table 2, wherein the relationship between the composition mass percentage of Ti and N elements in the constituent elements is: Ti-3.4N= 0.0064%.

[0034] A preparation method of hydrogen sulfide stress corrosion resistant high-strength steel of the present invention adopts TMCP method to prepare, comprising the steps of:

[0035] According to the mass percentage of the target steel, 50 kg of steel ingots are smelted in a vacuum furnace, and forged into a square billet with a size of 180×120×200mm, which is used as a forged billet, and then the forged billet is heated and kept at 1200°C for 3 hours and then placed on a rolling mill Rolling is carried out, and the rolling passes are divided into fou...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
yield strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a high-strength steel with hydrogen sulfide stress corrosion resistance and a preparation method thereof. A low-carbon low-manganese component system is adopted for reducing composition segregation; by adding alloys such as Cr, Mo and V, solid solution strengthening and precipitation strengthening are utilized for improving the strength; by adding an Nb element, the recrystallization temperature is improved, the grains are refined, and the hydrogen sulfide stress corrosion resistance of the steel is improved; by adding B, a strengthening effect on a grain boundary is utilized, so that the free energy of the grain boundary is reduced, and the formation of hydride causing grain boundary embrittlement is impeded; by adding a Ti element for fixing N, the formation of abrittle phase BN on the grain boundary is inhibited, and the hydrogen sulfide resistance index of the steel is improved. According to the preparation method provided by the invention, the low-carbon steel with hydrogen sulfide stress corrosion resistance which is not lower than a 90ksi grade can be prepared. The steel provided by the invention has low cost, higher steel grade, and favorable hydrogen sulfide stress corrosion cracking resistance, can be applied to production of oil sleeve pipes and pipeline pipes with hydrogen sulfide stress corrosion resistance, and meets the requirements of oil and gas exploitation and conveyance with the requirement on hydrogen sulfide stress corrosion resistance.

Description

technical field [0001] The invention relates to a low-carbon high-strength steel and a preparation method thereof, in particular to a corrosion-resistant high-strength steel and a preparation method thereof, steel for oil casing and line pipe used in oil and gas development and transportation and its preparation process technical field . Background technique [0002] In recent years, the world's demand for oil has increased rapidly, with an annual growth rate of 1.6%. At present, the content of corrosive media in my country's oil and gas fields is increasing. The corrosive media mainly include carbon dioxide and hydrogen sulfide. For example, in oil fields in eastern Sichuan, the content of hydrogen sulfide reach more than 10%. Corrosion of steel is one of the main obstacles restricting the safe and stable production of my country's petroleum industry. Corrosive media such as hydrogen sulfide can not only corrode the surface of the pipe body uniformly, but also generate hydr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/26C22C38/24C22C38/28C22C38/32C22C38/06C21D8/02
CPCC21D8/0226C21D2211/002C21D2211/005C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32
Inventor 陈业新董晓明
Owner SHANGHAI UNIV