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Superhigh strength X100 pipeline steel and its hot rolled plate making process

An ultra-high-strength, pipeline steel technology, applied in the direction of temperature control, etc., can solve the problems of insufficient impact toughness and welding performance, difficult manufacturing, high production cost, etc., and achieve the effect of increasing strength, increasing productivity and reducing manufacturing cost

Active Publication Date: 2008-07-02
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It mainly solves the technical problems that the existing X100 pipeline steel formula is relatively complicated, the production cost is high, the manufacturing difficulty is relatively large, and the impact toughness and welding performance are slightly insufficient

Method used

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  • Superhigh strength X100 pipeline steel and its hot rolled plate making process
  • Superhigh strength X100 pipeline steel and its hot rolled plate making process
  • Superhigh strength X100 pipeline steel and its hot rolled plate making process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The chemical composition of embodiment 1-6 is shown in table 2

[0027] ●Table 2 Chemical composition wt%:

[0028]

Yuan

white

C

mn

Si

S *

P

Nb

Ti

Cu

Ni

Mo

Cr

Alt

N

V

B

1

0.055

2.00

0.21

0.0030

0.012

0.045

0.018

0.25

0.25

0.10

0.25

0.020

0.0038

0.10

-

2

0.065

2.00

0.30

0.0009

0.012

0.045

0.021

0.30

0.30

0.30

-

0.054

0.0040

-

0.0018

3

0.016

2.45

0.25

0.0020

0.014

0.145

0.008

-

-

0.55

-

0.035

0.0045

-

-

4

0.030

2.20

0.35

0.0020

0.012

0...

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PUM

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Abstract

The present invention relates to pipeline steel, and is especially one kind of superhigh strength X100 pipeline steel and process of making hot rolled plate of the X100 pipeline steel. The superhigh strength X100 pipeline steel consists of C 0.015-0.080 wt%, Mn 1.80-2.50 wt%, Si not more than 0.6 wt%, S not more than 0.0030 wt%, P not more than 0.015 wt%, Nb 0.04-0.15 wt%, Ti 0.005-0.030 wt%, V not more than 0.120 wt%, Alt not more than 0.060 wt%, N not more than 0.010 wt%, O not more than 0.006 wt%, Mo 0.10-0.60 wt%, Cu not more than 0.50 wt%, Ni not more than 1.50 wt%, Cr not more than 1.0 wt%, B not more than 0.0020 wt%, Ca not more than 0.01 wt%, and Fe and inevitable impurity for the rest. The rolling process of making hot rolled plate has plate blank heating temperature of 1100-1250 deg.c, final rolling temperature of 720-880 deg.c, final cooling temperature of 200-500 deg.c and cooling speed of 3-30 deg.c / s.

Description

Technical field: [0001] The invention relates to a pipeline steel and a manufacturing method thereof, in particular to an ultra-high-strength X100 pipeline steel and a manufacturing method of a hot-rolled plate thereof. Background technique: [0002] In recent years, the changes in the energy structure and the increase in energy demand have greatly promoted the development of long-distance transmission pipelines. In order to improve transmission efficiency and reduce project investment, it has become a trend to develop steel for long-distance oil and gas transmission pipelines to high-grade steel. At present, the highest steel grade in the pipeline steel standards used by various countries in the world is only X80 (yield strength greater than or equal to 555MPa). In order to meet the development of long-distance oil and gas pipeline construction in the future, ultra-high-strength grade X100 (yield strength grade greater than or equal to 690MPa is required) ) and X120 (yield...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14B21B37/74
Inventor 高珊郑磊
Owner BAOSHAN IRON & STEEL CO LTD
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