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Low inclusion pipeline steel production method

A production method and low-inclusion technology, which is applied in the production field of low-inclusion pipeline steel, can solve problems such as excessive B-type inclusions, adverse effects on product quality and enterprise benefits, and failure of flaw detection, so as to reduce oxidation or oxygen content , Saving process costs and improving production efficiency

Inactive Publication Date: 2018-09-21
JINGYE STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For high-strength pipeline steels, such as X70 and X80, many manufacturers have encountered the problem that the B-type inclusions exceed the standard and cause flaw detection failures
In most enterprises, the rate of B-type inclusions exceeding the standard is as high as 1-2%, or even higher, which has a negative impact on product quality and enterprise benefits

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The production method of low-inclusion pipeline steel is characterized in that the composition of pipeline steel is C 0.062%, Si 0.25%, Mn 1.75%, P≤0.015%, S≤0.005%, Nb 0.07%, Ti 0.010%, Al≤0.050 %, Cr 0.5%, Mo0.55%, Ni 0.2%, Cu 0.15%, W 0.005%, Zr 0.0001%, Ta 0.0001%, rare earth (Sc+Y) 0.0001%, Sc:Y mass ratio is 4:1, B 0.0001%, N 0.001%, and the balance is Fe and unavoidable impurity elements.

[0047] The process route includes: ratio preparation → hot metal pretreatment desulfurization → converter smelting → LF refining → RH refining → continuous casting → rolling → coiling; the core steps are as follows:

[0048](1) KR molten iron pretreatment desulfurization: oxygen blowing time is 20-22min, oxygen supply intensity is 10000-13000m3 / h, S content of molten iron before treatment is ≤0.03%, desulfurizer addition is 14-15kg / t, iron after treatment The sulfur content in the water is ≤0.001%; ​​the mass of lime powder in the desulfurizer accounts for 90-95%, and the mag...

Embodiment 2

[0056] The production method of low-inclusion pipeline steel is characterized in that: the composition of pipeline steel is C 0.063%, Si 0.27%, Mn 1.76%, P≤0.015%, S≤0.005%, Nb 0.08%, Ti 0.011%, Al≤0.050 %, Cr 0.6%, Mo0.58%, Ni 0.22%, Cu 0.18%, W 0.007%, Zr 0.0002%, Ta 0.001%, rare earth (Sc+Y) 0.0002%, Sc:Y mass ratio is 5:1, B 0.0002%, N 0.003%, and the balance is Fe and unavoidable impurity elements.

[0057] The process route includes: ratio preparation → hot metal pretreatment desulfurization → converter smelting → LF refining → RH refining → continuous casting → rolling → coiling; the core steps are as follows:

[0058] (1) KR molten iron pretreatment desulfurization: oxygen blowing time is 20-22min, oxygen supply intensity is 10000-13000m3 / h, S content of molten iron before treatment is ≤0.03%, desulfurizer addition is 14-15kg / t, iron after treatment The sulfur content in the water is ≤0.001%; ​​the mass of lime powder in the desulfurizer accounts for 90-95%, and the m...

Embodiment 3

[0066] The production method of low-inclusion pipeline steel is characterized in that: the composition of pipeline steel is C 0.065%, Si 0.3%, Mn 1.78%, P≤0.015%, S≤0.005%, Nb 0.095%, Ti 0.012%, Al≤ 0.050%, Cr 0.65%, Mo0.6%, Ni 0.25%, Cu 0.19%, W 0.008%, Zr 0.0004%, Ta 0.005%, rare earth (Sc+Y) 0.0005%, Sc:Y mass ratio is 5:1 , B 0.0005%, N 0.005%, and the balance is Fe and unavoidable impurity elements.

[0067] The process route includes: ratio preparation → hot metal pretreatment desulfurization → converter smelting → LF refining → RH refining → continuous casting → rolling → coiling; the core steps are as follows:

[0068] (1) KR molten iron pretreatment desulfurization: oxygen blowing time is 20-22min, oxygen supply intensity is 10000-13000m3 / h, S content of molten iron before treatment is ≤0.03%, desulfurizer addition is 14-15kg / t, iron after treatment The sulfur content in the water is ≤0.001%; ​​the mass of lime powder in the desulfurizer accounts for 90-95%, and the ...

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Abstract

The invention provides a low inclusion pipeline steel production method. The low inclusion pipeline steel production method is characterized in that pipeline steel comprises 0.062-0.065% of c, 0.25-0.3% of Si, 1.75-1.78% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.07-0.095% of Nb, 0.010-0.012% of Ti, less than or equal to 50% of Al, 0.5-0.65% of Cr, 0.55-0.6% ofMo, 0.2-0.25% of Ni, 0.15-0.19% of Cu, 0.005-0.008% of W, 0.0001-0.0004% of Zr, 0.0001-0.005% of Ta, 0.0001-0.0005% of rare earth (Sc+Y), 0.0001-0.0005% of B, 0.001-0.005% of N, and the balance beingFe and inevitable impurity elements, wherein the mass ratio of Sc to Y is 4-5: 1; the final structure comprises 90-92% of needle-shaped ferrite, 3-5% of polygonal ferrite and 3-5% of martensite according to the area percentage; the average grain size is 2-5 microns; the yield strength is 930-960 MPa; the tensile strength is 1050-1250MPa; the impact toughness is 150-170J at the temperature of minus 40 DEG C; and the extension rate is 17-19%. The process route comprises the steps of preparing materials according to a ratio, treating molten iron in advance for desulfuration, smelting in a converter, refining in a LF (ladle furnace), carrying out RH refining, carrying out continuous casting, rolling and reeling.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a production method of low-inclusion pipeline steel. Background technique [0002] Pipeline steel is the medium and thick plate and coil required for the manufacture of oil and natural gas pipelines or coal and building material slurry pipelines. The oil and gas pipeline is the most convenient and safest way to connect the resource area and the use area. Its rapid construction can not only relieve the pressure of road transportation in my country, but also play an important role in ensuring the safe supply of the oil and gas market. The carbon content of pipeline steel is gradually reduced, the alloy elements are diversified, and harmful elements such as sulfur and phosphorus are also controlled at a very low content. In addition to high strength and high toughness, high-grade pipeline steel also has good crack resistance (sulfide stress cracking resistance (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/58C22C38/48C22C38/50C22C38/06C22C38/44C22C38/42C22C38/54C21C7/06C21C7/04C21C7/10C21D8/02
CPCC21C7/0006C21C7/04C21C7/06C21C7/10C21C2007/0093C21D8/0205C21D8/0226C21D2211/005C22C38/001C22C38/005C22C38/02C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50C22C38/54C22C38/58Y02P10/20
Inventor 张觉灵杨海西曹喜军史二明
Owner JINGYE STEEL CO LTD
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