A kind of slurry conveying pipeline steel and its manufacturing process

A pipeline steel and slurry technology, applied in the field of steel manufacturing, can solve problems such as poor welding performance, and achieve the effects of solving poor welding performance, low ductile-brittle transition temperature, and reducing alloy cost

Active Publication Date: 2017-05-03
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a slurry conveying pipeline steel and its manufacturing process to solve the technical problem of poor welding performance of the existing slurry conveying pipeline steel

Method used

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  • A kind of slurry conveying pipeline steel and its manufacturing process
  • A kind of slurry conveying pipeline steel and its manufacturing process
  • A kind of slurry conveying pipeline steel and its manufacturing process

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0062] Provide a slurry transportation pipeline steel with a thickness of 14.3mm, and its smelting composition is shown in Table 1 below:

[0063] Table 1.1 Smelting composition of 4.3mm slurry pipeline steel

[0064]

[0065] Refer to Table 2 for the manufacturing process parameters of slurry pipeline steel with a thickness of 14.3mm:

[0066] Table 2.1 Manufacturing process parameters of 4.3mm slurry pipeline steel

[0067] Baking temperature / ℃ In the furnace time / min Last pass reduction / mm Final rolling temperature / ℃ Coiling temperature / ℃ 119523022820549

example 2

[0069] Provide a slurry pipeline steel with a thickness of 17.5mm. The smelting composition is shown in Table 3 below:

[0070] Table 3.1 Smelting composition of 7.5mm slurry pipeline steel

[0071]

[0072] Refer to Table 4 for the manufacturing process parameters of slurry pipeline steel with a thickness of 17.5mm:

[0073] Table 4.1 Manufacturing process parameters of 7.5mm slurry pipeline steel

[0074] Baking temperature / ℃ In the furnace time / min Last pass reduction / mm Final rolling temperature / ℃ Coiling temperature / ℃ 117527126835584

[0075] The mechanical properties of slurry transportation pipeline steel in Example 1 and Example 2 of the present invention are shown in Table 5 below:

[0076] Table 5.1 Mechanical properties of slurry pipeline steel of 4.3mm size and 17.5mm size

[0077]

[0078] Example 1: DWTT test results of slurry pipeline steel figure 1 As shown, the ductile-brittle transition temperature of 14.3mm slurry pipeline steel is about -31℃, and the DWTT test res...

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Abstract

The invention discloses slurry conveying pipeline steel and a manufacturing process of the slurry conveying pipeline steel. The technical problem of poor welding performance of the existing slurry conveying pipeline steel is solved. A melting ingredient of the slurry conveying pipeline steel consists of the following chemical ingredients in percentage by mass: 0.04 weight percent to 0.10 weight percent of element carbon, 0.10 weight percent to 0.30 weight percent of element silicon, 1.00 weight percent to 1.60 weight percent of element manganese, at most 0.020 weight percent of element phosphorus, at most 0.005 weight percent of element sulphur, 0.010 weight percent to 0.050 weight percent of element vanadium, 0.050 weight percent to 0.080 weight percent of element niobium, 0.15 weight percent to 0.50 weight percent of element chromium, 0.010 weight percent to 0.050 weight percent of titanium element, element iron and unavoidable trace impurities, wherein the slurry conveying pipeline steel comprises polyphase structures formed by ferrite, ferrito martensite and a small amount of pearlite; the grain size of the polyphase structures is greater than or equal to 12 grades. Good matching of the strength, the plasticity and the toughness of hot rolled curling plates is realized; the manufacturing process is more applicable to the practical application of the slurry conveying pipeline steel.

Description

Technical field [0001] The invention relates to the technical field of steel manufacturing, in particular to a slurry conveying pipeline steel and a manufacturing process thereof. Background technique [0002] Slurry pipeline transportation is to mix granular solid materials with liquid transportation media and transport them in the pipeline by pumping. Therefore, the solid particles in the coal slurry will cause greater wear on the inner wall of the pipeline. Studies have shown that the wear in the coal pipeline process belongs to erosion wear, which refers to a type of wear phenomenon in which the surface of the material is damaged when impacted by small and loose flowing particles. It is caused by the impact of the multiphase flow medium on the surface of the material. Therefore, requirements for high strength, high plastic toughness, low yield ratio, and high erosion resistance are put forward for steel materials. [0003] In the prior art, the content of C (carbon element) o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C38/12C22C38/18C22C38/04C22C38/02C21D8/02
Inventor 牛涛安成钢姜永文吴新朗陈斌武军宽李飞于晨张彩霞代晓莉高攀徐伟崔阳缪成亮
Owner SHOUGANG CORPORATION
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