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Pipeline steel plate with low yield ratio, fine grains and high strength and production method thereof

A technology with low yield ratio and production method, which is applied in the field of high-strength pipeline steel plates, can solve the problems of low yield strength and achieve the effects of reduced yield ratio, stable production process, and fine ferrite grains

Inactive Publication Date: 2011-03-16
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The obtained yield strength is relatively low, but the yield strength is only greater than 345MPa

Method used

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  • Pipeline steel plate with low yield ratio, fine grains and high strength and production method thereof
  • Pipeline steel plate with low yield ratio, fine grains and high strength and production method thereof
  • Pipeline steel plate with low yield ratio, fine grains and high strength and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] A low yield ratio ultra-fine grain high-strength pipeline steel plate according to the present invention, the chemical composition of the steel in the pipeline steel plate is calculated by weight percentage, C: 0.03-0.10%, Si: 0.10-0.30%, Mn: 1.20- 1.80%, P: ≤0.015%, S: ≤0.005%, Nb: 0.040~0.060%, Ti: 0.006~0.020%, Cr: 0.10~0.40%, Ni: 0.10~0.30%, Al: 0.010~0.050%, The balance is Fe and unavoidable impurities.

[0038] According to the production process of the present invention, the actual chemical composition of the smelting and rolling steel of the present invention is shown in Table 1.

[0039] The chemical composition (wt %) of the embodiment of the present invention of table 1

[0040] Example

C

Si

mn

P

S

Nb

Ti

Cr

Ni

Alt

Example 1

0.047

0.10

1.53

0.010

0.0008

0.054

0.010

0.13

0.17

0.022

Example 2

0.042

0.12

1.57

0.013

0.0007...

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Abstract

The invention discloses a pipeline steel plate with low yield ratio, fine grains and high strength and a manufacturing method thereof, and steel in the pipeline steel plate comprises the following chemical components by weight percent: 0.03-0.10% of C, 0.10-0.30% of Si, 1.20-1.80% of Mn, not more than 0.015% of P, not more than 0.005% of S, 0.040-0.060% of Nb, 0.006-0.020% of Ti, 0.10-0.40% of Cr, 0.10-0.30% of Ni, 0.010-0.050% of Al and the balance of Fe and inevitable impurities. The manufacturing method adopts a converter for smelting, adopts the TMCP (thermo mechanical control process) and the two-phase region subthermal quenching treatment at 720-750 DEG C, thereby obtaining the pipeline steel plate with low yield ratio, fine grains and high strength; and the manufacturing method has stable production process, strong operability, low cost and high performances.

Description

technical field [0001] The invention relates to a high-strength pipeline steel plate, in particular to a high-strength pipeline steel plate with low yield ratio and fine grain and a production method thereof. Background technique [0002] With the continuous lengthening of pipelines in the world, the production level of pipeline steel and the performance level of materials are also an important symbol of the national steel industry and steel material level. At present, my country's demand for pipeline steel is very large. This year, the length of my country's long-distance pipeline has increased to 200,000 kilometers. [0003] One of the most challenging areas for pipeline development is seismic zones and permafrost zones, where large plastic deformations of buried pipeline pipes can occur. For this kind of pipeline engineering, the "strain-based design method" anti-large deformation pipeline steel must be adopted. This "strain-based design" pipeline steel has a higher res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C22C38/58C21D8/02
Inventor 邱红雷刘朝霞楚觉非王端军李晓玲陈远姝宋世佳范益王晓文赵亚娟李丽
Owner NANJING IRON & STEEL CO LTD
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