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Seamless steel tube for X80 delivery line and its manufacturing method

A technology of a seamless steel pipe and a manufacturing method, which is applied in the field of low-alloy steel manufacturing, can solve the problems of increased environmental pollution, long manufacturing cycle, and reduced yield, and achieves the effects of low alloy component cost, short manufacturing cycle, and low manufacturing cost.

Inactive Publication Date: 2014-06-25
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this invention is that the off-line heat treatment manufacturing process of quenching and high temperature tempering has high manufacturing costs such as alloys and energy consumption, long manufacturing cycle, reduced yield and increased environmental pollution.

Method used

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  • Seamless steel tube for X80 delivery line and its manufacturing method
  • Seamless steel tube for X80 delivery line and its manufacturing method

Examples

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Embodiment Construction

[0030] The following examples illustrate the implementation of the present invention, and these examples are only descriptions of the best implementation modes of the present invention, and do not limit the scope of the present invention in any way. Table 1 shows the chemical composition of the steel in the example, and its technological process is converter smelting—external refining—square billet continuous casting—round billet rolling—ring furnace heating—bacterial piercing machine pipe piercing—continuous pipe rolling mill pipe rolling—fixed Diameter forming - controlled cooling - tempering heat treatment. The specific process system of the embodiment is shown in Table 2, and Table 3 shows the mechanical properties of the steel of the embodiment.

[0031] The chemical composition (wt %) of the embodiment of table 1

[0032] category

C

Si

mn

P

S

Nb

Ti

Cr

Fe

CE IIW

example 1

0.14

0.31

1.33

0.010

...

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PUM

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Abstract

The invention discloses a seamless steel tube for an X80 delivery line and its manufacturing method; the seamless steel tube comprises 0.12%-0.16% of C, 0.30%-0.45% of Si, 1.24%-1.44% of Mn, 0.30%-0.50% of Cr, 0.02%-0.05% of Nb, 0.01%-0.03% of Ti, less than or equal to 0.020% of P, less than or equal to 0.012% of S and the balance of Fe and unavoidable impurities, and the carbon equivalent CEIIW is 0.39-0.50. After sizing finish rolling, the steel tube temperature is controlled to be more than 800 DEG C, and accelerated cooling of 10 DEG C / s-25 DEG C / s is performed, so that the steel tube temperature is rapidly cooled to 600-700 DEG C, the rapidly-cooled steel tube can be transferred to air cooling for cooling to less than 100 DEG C, and tempering treatment is performed on the steel tube at 550-650 DEG C.

Description

technical field [0001] The invention belongs to the technical field of low-alloy steel manufacturing, and mainly relates to a pipeline steel pipe for oil and gas transportation and a manufacturing method thereof, in particular to a seamless steel pipe for transportation with an X80 strength level and a manufacturing method thereof. Background technique [0002] There are two types of pipelines, seamless steel pipes and welded pipes. The line pipes made of seamless steel pipes generally account for about 10% of the steel pipes used for pipelines, and are mainly used in special sections on the road, in and out of pressurization stations, and urban trunk lines. According to the latest 44th edition of the international industry standard API 5L, X80 PSL2 grade line pipe must meet the strict requirements of tensile strength, yield strength, impact toughness and yield ratio. [0003] At present, the seamless steel pipes for transmission pipelines with X80 PSL2 strength grade mainly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C21D8/10C21D1/18
Inventor 解德刚王长顺陈克东赵波郑云龙陈勇邸军
Owner ANGANG STEEL CO LTD
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