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X60N normalizing pipeline steel and production method thereof

A production method and pipeline steel technology, applied in the field of pipeline steel production, can solve problems such as abnormal structure, uneven structure, fluctuation of pipeline steel performance, etc., and achieve the effect of uniform structure, stable performance and improved strength performance

Active Publication Date: 2015-08-26
NANJING IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For pipeline steel after rolling, there may be defects such as uneven structure and abnormal structure, which lead to fluctuations in the performance of pipeline steel

Method used

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  • X60N normalizing pipeline steel and production method thereof
  • X60N normalizing pipeline steel and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The product specification is X60N normalizing pipeline steel with a thickness of 16mm, and its chemical composition (wt%) is as follows: C0.083193wt%, Si0.288wt%, Mn1.6113wt%, S0.0014wt%, P0.008wt%, Ni0.0406wt% , Cr0.2259wt%, Cu0.0123wt%, Nb0.0548wt%, V0.0046wt%, Ti0.012wt%, Mo0.0086wt%, Alt0.0308wt%, the rest is Fe and unavoidable impurities.

[0028] Its production process includes converter smelting, continuous casting, rolling, and normalizing heat treatment processes. The molten steel is smelted and poured into a billet with a thickness of 150mm. The billet is first subjected to rough rolling stage: starting rolling temperature: 1030°C, finishing rolling temperature: 1000°C; finishing rolling stage: starting rolling temperature: 940°C, finishing rolling temperature: 800°C; ACC laminar flow cooling, water inlet temperature is 790°C, red return temperature is 460°C,

[0029] After the steel plate is cooled, the stack is slowly cooled, and the stack cooling time is 1...

Embodiment 2

[0031] The product specification is X60N normalizing pipeline steel with a thickness of 16mm, and its chemical composition (wt%) is as follows: C0.083193wt%, Si0.288wt%, Mn1.6113wt%, S0.0014wt%, P0.008wt%, Ni0.0406wt% , Cr0.2259wt%, Cu0.0123wt%, Nb0.0548wt%, V0.0046wt%, Ti0.012wt%, Mo0.0086wt%, Alt0.0308wt%, the rest is Fe and unavoidable impurities.

[0032] After converter smelting, continuous casting, rolling, and normalizing heat treatment processes, the molten steel is smelted and poured into a billet with a thickness of 150mm. The billet is first subjected to rough rolling stage: starting rolling temperature: 1030°C, finishing rolling temperature: 1000; finishing rolling stage: starting rolling temperature : 940°C, final rolling temperature: 800°C; after rolling, the steel plate enters the ACC laminar flow cooling, the water inlet temperature is 790°C, the redness temperature is 460°C, the steel plate is stacked and cooled slowly after cooling, and the stack cooling time ...

Embodiment 3

[0034] The product specification is X60N normalizing pipeline steel with a thickness of 16mm, and its chemical composition (wt%) is as follows: C0.083193wt%, Si0.288wt%, Mn1.6113wt%, S0.0014wt%, P0.008wt%, Ni0.0406wt% , Cr0.2259wt%, Cu0.0123wt%, Nb0.0548wt%, V0.0046wt%, Ti0.012wt%, Mo0.0086wt%, Alt0.0308wt%, the rest is Fe and unavoidable impurities. After converter smelting, continuous casting, rolling, and normalizing heat treatment processes, the molten steel is smelted and poured into a billet with a thickness of 150mm. The billet is first subjected to rough rolling stage: starting rolling temperature: 1030°C, finishing rolling temperature: 1000; finishing rolling stage: starting rolling temperature : 940°C, final rolling temperature: 800°C; after rolling, the steel plate enters the ACC laminar flow cooling, the water inlet temperature is 790°C, the redness temperature is 460°C, the steel plate is stacked and cooled slowly after cooling, and the stack cooling time is 12-24 ...

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Abstract

The invention discloses X60N normalizing pipeline steel and a production method thereof. The X60N normalizing pipeline steel comprises the following elements: 0.07 to 0.15 percent of C, 0.20 to 0.40 percent of Si, 1.55 to 1.7 percent of Mn, greater than or equal to 0.008 percent of P, greater than or equal to 0.015 percent of S, greater than or equal to 0.10 percent of Mo, 0.02 to 0.05 percent of Alt, greater than or equal to 0.30 percent of Ni, greater than or equal to 0.30 percent of Cr, greater than or equal to 0.30 percent of Cu, 0.004 to 0.008 percent of V, 0.03 to 0.06 percent of Nb, 0.005 to 0.025 percent of Ti, and Fe and inevitable impurity elements for the surplus. The production method mainly comprises converter smelting, continuous casting, rolling and normalizing heat treatment. The X60N normalizing pipeline steel with strength and tenacity being properly matched with each other through rolling and normalizing heat treatment, the strength property of the steel is guaranteed by increasing the carbon content, the tenacity of the steel, especially the low-temperature tenacity of the steel, is greatly improved through the added Nb, V and Ti microalloy elements and normalizing heat treatment. The X60N normalizing pipeline steel produced through the method is small and uniform in phase transformation structures, and has not only high strength but also very excellent low-temperature tenacity.

Description

technical field [0001] The invention belongs to the technical field of pipeline steel production, and in particular relates to an X60N normalizing pipeline steel and a production method thereof. Background technique [0002] Due to the rapid development of the modern economy, the demand for oil and natural gas is increasing day by day. Since the users of oil and natural gas are mainly in industrially developed urban areas, and their production areas are mostly distributed in remote areas such as polar regions, deserts, ice sheets, and oceans, how to economically transport oil and gas resources in remote areas to densely populated economically developed areas , has become an urgent problem that human beings need to solve. The bottom of the ocean is full of rich oil and gas resources, so people first focus on the ocean and focus on solving the problem of oil and gas transportation at the bottom of the ocean. The service environment of submarine pipelines is relatively comple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C21D8/02
Inventor 霍松波黄贞益姜金星侯清宇卢茜倩姜辉
Owner NANJING IRON & STEEL CO LTD
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