X120 high grade pipeline steel and preparation method thereof

A technology of X120 and pipeline steel, applied in the field of iron and steel metallurgy, can solve the problems of low control rolling temperature, easy to produce mixed crystals, etc., and achieve the effect of large increase in strength, increase in conveying pressure, and save process cost.

Inactive Publication Date: 2017-05-17
INNER MONGOLIA BAOTOU STEEL UNION
View PDF4 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the controlled rolling temperature is low, and it is easy to produce mixed crystals

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
  • X120 high grade pipeline steel and preparation method thereof
  • X120 high grade pipeline steel and preparation method thereof
  • X120 high grade pipeline steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] The preparation method of X120 high steel grade pipeline steel specifically comprises the following steps:

[0028] Step 1: Smelting and casting;

[0029] Put the prepared low-phosphorus (≤0.015%), low-sulfur (≤0.005%), low-oxygen (≤0.0030%), low-nitrogen (≤0.0050%) high-quality steel scrap and other alloys prepared into the laboratory into 100kg vacuum smelting The furnace is vacuumized and started for melting and smelting. After being melted, it is cast into a rectangular steel mold and cast into a rectangular steel billet with a size of 150×200×250mm.

[0030] Step 2: heating and rolling;

[0031] The steel billet is loaded into the high temperature resistance furnace with a manipulator. The heating temperature is 1180~1220℃, and the total time in the furnace is ≥240min to ensure uniform temperature of the billet. When the billet meets the heating requirements, the billet is sent to the φ750×550mm experimental rolling mill by a manipulator. The manufacturing proce...

Embodiment 1

[0038] It is smelted according to the chemical composition shown in Table 1, and cast into steel ingots, and the steel ingots are heated to 1202 ° C, and the total time in the furnace is 245 minutes. The first-stage rolling is carried out on the experimental rolling mill, that is, the rolling in the austenite recrystallization zone. When the thickness of the piece is 45mm, it is heated to 945°C on the roller table, and then the second stage of rolling is carried out, that is, rolling in the austenite non-recrystallized zone. The final rolling temperature is 800°C. After rolling, the steel plate enters the laminar flow cooling device and is cooled to 285°C at a rate of 40°C / s, and then loaded into a simulated coiling furnace. Finally, a steel plate can be obtained.

[0039] like figure 1 Shown is the metallographic structure diagram of the steel plate in Example 1 of the present invention. The steel plate is bainite and lath martensite.

Embodiment 2

[0041] Embodiment is the same as Example 1, wherein the heating temperature is 1205° C., and the total time in the furnace is 246 minutes. The starting temperature of the first stage of rolling is 1182°C, the thickness of the intermediate billet is 45mm, the starting temperature of the second stage of rolling is 948°C, and the final rolling temperature is 805°C. After rolling, the steel plate enters the laminar flow cooling device , cooled to 330°C at a rate of 35°C / s, and then loaded into a simulated coiling furnace. Finally, the steel plate can be obtained.

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
thicknessaaaaaaaaaa
Login to view more

Abstract

The invention discloses an X120 high grade pipeline steel. The X120 high grade pipeline steel comprises the following components in percentages by weight: 0.04-0.06% of C, 0.20-0.30% of Si, 1.80-2.00% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.075-0.090% of Nb, less than or equal to 0.030% of V, 0.010-0.020% of Ti, less than or equal to 0.050% of Al, 0.25-0.35% of Cr, 0.25-0.35% of Mo, 0.30-0.40% of Ni, 0.25-0.35% of Cu, 0.0008-0.015% of B, less than or equal to 80 ppm of N, 0.15-0.25% of Pcm and the balance of Fe and impurities. The invention further discloses a preparation method of the X120 high grade pipeline steel. A steel plate produced from the X120 high grade pipeline steel has the advantages of high strength, high toughness and low yield ratio.

Description

technical field [0001] The invention relates to an iron and steel metallurgy technology, in particular to an X120 high-grade pipeline steel and a preparation method thereof. Background technique [0002] Oil and natural gas is an important strategy and reserve material of the national economy. With the rapid development of the national economy, the demand for energy such as oil and natural gas is increasing. The continuous growth of energy demand, structural adjustment and optimization have driven the oil and gas industry. The world's natural gas demand will double by 2030. Pipeline transportation has the advantages of large transportation volume, low cost, high safety, convenience and high efficiency. [0003] With the increasing demand for oil and natural gas, the transmission pressure and pipe diameter of pipelines are also increasing, and the oil and gas transmission steel pipes are also rapidly developing towards high-grade steel grades. With the development of the X1...

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 Applications(China)
IPC IPC(8): C22C38/02C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58C21D8/02
CPCC22C38/02C21D8/0226C21D2211/002C21D2211/008C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58
Inventor 王少炳袁晓鸣袁媛卢晓禹
Owner INNER MONGOLIA BAOTOU STEEL UNION
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap