Hot-rolled sheet coils of X80 pipe line steel and manufacturing method thereof

A technology of hot-rolled coils and manufacturing methods, applied in the direction of manufacturing converters, temperature control, etc., can solve the problems of long production cycle, large heat energy loss, high production cost, etc., to save energy, improve heat energy use efficiency, and improve production efficiency Effect

Inactive Publication Date: 2011-04-20
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem of adding precious alloy elements to the alloy design in the prior art, and the thick gauge continuous casting slab is used in the manufacturing process, the sl...

Method used

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  • Hot-rolled sheet coils of X80 pipe line steel and manufacturing method thereof
  • Hot-rolled sheet coils of X80 pipe line steel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] The examples of the present invention are listed below, and these examples are only descriptions of the best implementation modes of the present invention, but do not limit the scope of the present invention in any way. Table 1 shows the chemical composition of the test steel. The process flow is molten iron pretreatment-converter smelting-outside furnace refining (RH+LF+calcium treatment)-continuous casting-slab heating-rolling-laminar cooling-coiling, test steel The specific process system is shown in Table 2. Table 3 shows the mechanical properties of the tested steels.

[0031] Table 1 embodiment test steel chemical composition (wt, %)

[0032] category

C

Si

mn

P

S

als

Cu

Ni

Cr

Mo

V

Nb

Ti

N

Ca

Pcm

example 1

0.051

0.25

1.87

0.014

0.002

0.029

0.20

0.19

0.29

0.12

-

0.090

0.012

0.003

0.0011

0.189

Ex...

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PUM

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Abstract

The invention discloses hot-rolled sheet coils of X80 pipe line steel and a manufacturing method thereof. The steel comprises the following chemical components by weight percent: 0.02-0.06% of C, 0.05-0.35% of Si, 1.70-1.90% of Mn, not more than 0.015% of P, not more than 0.004% of S, 0.20-0.35% of Cr, 0.06-0.15% of Mo, 0.06-0.11% of Nb, not more than 0.08% of V, not more than 0.20% of Ni, not more than 0.25% of Cu, 0.005-0.025% of Ti, 0.015-0.045% of Als, 0.001-0.004% of Ca, not more than 0.006% of N and the balance Fe and inevitable impurities. The cold cracking susceptivity coefficient Pcm is not more than 0.21%. The manufacturing method is characterized in that the continuous casting slabs are directly subjected to hot charging at 500-850 DEG C and are discharged after being heated to 1150-1250 DEG C, the final rolling temperature of rough rolling is 1030-970 DEG C, the final rolling temperature of finish rolling is 750-850 DEG C, the compression ratio of finish rolling is more than 60% and the sheet coils are rapidly cooled at the speed of 10-25 DEG C/s by way of laminar cooling and are coiled at 450-580 DEG C. In the invention, hot charging rolling is adopted, thus improving the service efficiency of heat, saving energy, shortening the production cycle, improving the production efficiency and greatly lowering the production cost.

Description

technical field [0001] The invention belongs to the field of manufacturing high-strength low-alloy steel, and in particular relates to an X80 pipeline steel and a manufacturing method thereof, in particular to a hot-rolled coil of X80 pipeline steel for manufacturing spiral submerged arc welded steel pipes in the API SPEC 5L specification and its Manufacturing method. Background technique [0002] Pipeline transportation is the most economical, safe, efficient and environmentally friendly transportation method for long-distance transportation of oil and natural gas. With the optimization and adjustment of the global energy structure, the demand for oil and natural gas energy is increasing, which stimulates the rapid development of pipeline construction. [0003] In order to reduce pipeline construction and operation costs and improve transmission efficiency, the development of long-distance pipelines to use high-grade, high-pressure, and large-diameter transmission has becom...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/38C21C5/28C21C7/00C21D7/13B21B37/74
Inventor 黄国建孔祥磊关菊马小军张禄林安晓光
Owner ANGANG STEEL CO LTD
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