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A wide-thick specification pipeline steel with excellent low-temperature toughness and its manufacturing method

A low-temperature toughness, pipeline steel technology, applied in the manufacture of converters, etc., can solve problems such as manganese sulfide inclusions, pipeline damage, pipeline failure, etc., to reduce the sulfur content of steel, reduce slagging time, and improve the performance of low-temperature toughness Effect

Active Publication Date: 2022-06-17
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High manganese will bring slender strips of manganese sulfide inclusions, and excessive aluminum deoxidation will produce B-type inclusions. These two types of inclusions are fatal to pipelines and will lead to internal cracks, resulting in pipeline damage. fail

Method used

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  • A wide-thick specification pipeline steel with excellent low-temperature toughness and its manufacturing method
  • A wide-thick specification pipeline steel with excellent low-temperature toughness and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a wide-thick specification pipeline steel with excellent low-temperature toughness. : 0.18%, Cr: 0.26%, Cu: 0.13%, Al: 0.011%, Nb: 0.053%, Mo: 0.13%, Ti: 0.015%, Mg: 0.0011%, N: 0.0033%, the balance is Fe and not Avoid impurities.

[0029] The manufacturing method includes the following steps:

[0030] S1. The molten iron is desulfurized by KR method, and then sent to the converter for blowing after slag removal;

[0031] S2. The top-bottom re-blowing method is adopted for blowing. Nickel, copper and molybdenum alloys are added to the converter together with the scrap steel. The converter taps are deoxidized in a strong deoxidation mode. The aluminum content after the furnace is 0.042% and the sulfur content is 0.009%;

[0032] S3. After the molten steel reaches the LF furnace, adjust the ladle bottom to blow argon, the argon flow rate is 330NL / min, power on and heat up, use lime and aluminum wire to slag, and then sample and analyze the slag ...

Embodiment 2

[0039]A wide-thick specification pipeline steel with excellent low-temperature toughness provided in this example is different from Example 1 in that its chemical composition and mass percentage are as follows: C: 0.051%, Si: 0.22%, Mn: 1.68%, P: 0.011 %, S: 0.0020%, Ni: 0.16%, Cr: 0.23%, Cu: 0.015%, Al: 0.009%, Nb: 0.039%, Mo: 0.005%, Ti: 0.017%, Mg: 0.0009%, N: 0.0036 %, the balance is Fe and inevitable impurities.

Embodiment 3

[0041] A wide-thickness specification pipeline steel with excellent low-temperature toughness provided in this example is different from Example 1 in that its chemical composition and mass percentage are as follows: C: 0.057%, Si: 0.19%, Mn: 1.59%, P: 0.013 %, S: 0.0010%, Ni: 0.03%, Cr: 0.03%, Cu: 0.02%, Al: 0.011%, Nb: 0.033%, Mo: 0.004%, Ti: 0.016%, Mg: 0.0013%, N: 0.0031 %, the balance is Fe and inevitable impurities.

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Abstract

The invention discloses a wide-thick specification pipeline steel with excellent low-temperature toughness and a manufacturing method thereof, and relates to the technical field of iron and steel production. Its chemical composition and mass percentage are as follows: C: 0.030%-0.080%, Si: 0.10%-0.40%, Mn : 1.50%~1.80%, P≤0.015%, S≤0.0030%, Ni≤0.30%, Cr≤0.30%, Cu≤0.30%, Al: 0.005%~0.015%, Nb: 0.030%~0.070%, Mo≤ 0.30%, Ti: 0.006%~0.020%, Mg: 0.0008%~0.0015%, N≤0.0050%, the balance is Fe and unavoidable impurities. The structure type mainly composed of acicular ferritic iron is obtained, and the strength and toughness are well matched, which meets the requirements of the API of pipeline steel and the standard requirements of China Petroleum and Petrochemical.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a wide and thick specification pipeline steel with excellent low temperature toughness and a manufacturing method thereof. Background technique [0002] With the rapid development of the economy, oil and gas have dominated my country's energy consumption for a long time. It is estimated that by 2035, the proportion of liquid natural gas in primary energy will reach 24%. my country's oil and gas development strategy is to expand the northwest channel, develop the northeast channel, consolidate the southwest channel, and strengthen the sea channel. In the process of oil and gas pipeline construction, products with wide and thick specifications are particularly valued. In the process of oil and gas transportation, in order to avoid pipeline failure, low temperature toughness is very important for safety performance. [0003] The design of pipeline products is main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/50C22C38/48C22C38/44C22C38/06C22C38/04C22C33/04C21C5/35C21C7/06C21C7/072C21C7/10C21D8/10
CPCC22C38/58C22C38/50C22C38/48C22C38/44C22C38/06C22C38/04C22C38/002C22C38/001C22C33/04C21C5/35C21C7/06C21C7/072C21C7/10C21D8/105
Inventor 翟冬雨员强鹏张以波吴俊平洪君姜金星潘中德杜海军殷杰刘帅
Owner NANJING IRON & STEEL CO LTD
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