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A high-strength eh36 steel plate for large heat input welding and its manufacturing method

A large line energy welding, EH36 technology, applied in the field of metallurgy, can solve the problems of low resistance to line energy, low carbon equivalent, strong toughness, difficulty, etc., to enhance market competitiveness, high low temperature impact energy, and broad application prospects. Effect

Active Publication Date: 2020-08-11
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Patent (CN104404369A) applied for a large heat input welding thick steel plate and its manufacturing method, which improves its resistance to large Line energy welding performance, can resist 200KJ / cm-400KJ / cm super large heat input welding, has excellent strength and toughness, the average Charpy impact energy at -40°C is above 50J, but Mg is an extremely oxidizable element, it is difficult to Industrial production controls the addition of alloys, the size and content of micron-sized inclusions, which brings great difficulty to production and poor operability
[0008] The patent (CN102839320A) applied for a steel plate for high heat input welding produced by TMCP process, the tensile strength is ≥550MPa, and it can resist high heat input welding of 100-200KJ / cm. The base metal and welding heat affected zone are at -20℃ The impact toughness is above 150J, but it is necessary to control the N content of 0.006-0.020%, and also add a trace of B element, and the resistance to heat input is small, so it is difficult to meet the requirements of large heat input welding.
[0009] The patent (CN101724779B) discloses a steel and steel plate with high toughness and adaptability to large heat input welding, which is produced by intensified thermomechanical rolling and accelerated cooling after rolling, and adopts C-Mn+Nb, Ti microalloying composition design , has the characteristics of low carbon equivalent, excellent strength and toughness, simple process and low cost, but it does not specifically involve high-energy-input welding

Method used

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  • A high-strength eh36 steel plate for large heat input welding and its manufacturing method
  • A high-strength eh36 steel plate for large heat input welding and its manufacturing method
  • A high-strength eh36 steel plate for large heat input welding and its manufacturing method

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Experimental program
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Effect test

Embodiment 1

[0050] The high-strength ship plate EH36 used for large heat input welding in this embodiment has a thickness of 50mm, and it is smelted from the following components by mass percentage: C: 0.08%, Si: 0.35%, Mn: 1.54%, P: 0.008% , S: 0.003%, Al: 0.005%, Nb: 0.016%, Ni: 0.30%, Ti: 0.015%, Ca: 0.003%, and the balance is Fe and unavoidable impurities.

[0051] The steps of the production method of the high-strength ship plate EH36 for large heat input welding of the present embodiment are as follows:

[0052] (1) Smelting: will contain the following mass percentage components C: 0.08%, Si: 0.35%, Mn: 1.54%, P: 0.008%, S: 0.003%, Al: 0.005%, Nb: 0.016%, Ni: 0.30 %, Ti: 0.015%, Ca: 0.003% molten steel is smelted in an electric furnace first, and sent to an LF refining furnace for refining. When the oxygen content is 15PPM, Ti is used for deoxidation. The temperature is 66.6Pa, and the vacuum holding time is 20 minutes. After the vacuum degassing treatment, add Fe-Ca wire 450m, sof...

Embodiment 2

[0065] The high-strength and high-strength ship plate EH36 used for large heat input welding in this embodiment has a thickness of 70 mm, and is smelted from the following components in mass percentages: C: 0.10%, Si: 0.30%, Mn: 1.55%, P: 0.007%, S: 0.003%, Al: 0.004%, Nb: 0.020%, Ni: 0.28%, Ti: 0.019%, Ca: 0.003%, and the balance is Fe and unavoidable impurities.

[0066] The steps of the production method of the high-strength high-strength ship plate EH36 steel plate for large heat input welding of the present embodiment are as follows:

[0067] (1) Smelting: will contain the following mass percentage components C: 0.10%, Si: 0.30%, Mn: 1.55%, P: 0.007%, S: 0.003%, Al: 0.004%, Nb: 0.020%, Ni: 0.28 %, Ti: 0.019%, Ca: 0.003% molten steel is smelted in an electric furnace first, then sent to an LF refining furnace for refining, when the oxygen content reaches 48PPM, use Ti to deoxidize, and the molten steel temperature reaches 1560°C and transfers to the RH furnace for vacuum d...

Embodiment 3

[0080] The high-strength high-strength ship plate EH36 used for large heat input welding in this embodiment has a thickness of 100 mm, and is smelted from the following components by mass percentage: C: 0.10%, Si: 0.30%, Mn: 1.50%, P: 0.004%, S: 0.003%, Al: 0.004%, Nb: 0.020%, Ni: 0.28%, Ti: 0.019%, Ca: 0.003%, and the balance is Fe and unavoidable impurities.

[0081] The steps of the production method of the high-strength high-strength ship plate EH36 steel plate for large heat input welding of the present embodiment are as follows:

[0082] (1) Smelting: will contain the following mass percentage components C: 0.10%, Si: 0.30%, Mn: 1.50%, P: 0.004%, S: 0.003%, Al: 0.004%, Nb: 0.020%, Ni: 0.28 %, Ti: 0.019%, Ca: 0.003% molten steel is smelted in an electric furnace first, and then sent to an LF refining furnace for refining. When the oxygen content is 95PPM, Ti is used for deoxidation. The temperature is 66.6Pa, and the vacuum holding time is 20 minutes. After vacuum degass...

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Abstract

The invention relates to a large heat input energy welding high-strength EH36 steel plate which is made of the following components in percentage by weight through smelting: 0.06-0.18% of C, 0.15-0.50% of Si, 1.10-1.60% of Mn, less than or equal to 0.012% of P, less than or equal to 0.003% of S, 0.10-0.40% of Ni, 0.010-0.030% of Nb, less than or equal to 0.010% of Al, 0.010-0.030% of Ti, 0.001-0.010% of Ca and the balance of Fe and inevitable impurities. The maximum thickness of the steel plate is 100mm, the yield strength of the steel plate is greater than or equal to 355MPa, the tension strength of the steel plate is greater than or equal to 510MPa, and the low-temperature impact absorption energy KV2 of the steel plate at minus 40 DEG C is greater than or equal to 150KJ. A production method of the steel plate comprises the following steps: carrying out smelting, LF / RH (Ladle Furnace / Ruhrstahl Heraeus) refining, continuous casting, heating, rolling, and rapid cooling, thereby obtaining a finished product of the steel plate. The steel plate produced by using the method provided by the invention has the characteristics of high purity, high strength, good low-temperature impact resistance, good toughness when the maximum input line energy is 300KJ / CM, and the like, can be widely applied to fields such as shipbuilding, bridges and building structures, and has wide application prospects.

Description

technical field [0001] The invention relates to a high-strength steel plate EH36 for large-scale ships, large bridges, and large-scale mechanical equipment used for large-scale heat-input welding, and also relates to a production method of the steel plate. It belongs to the field of metallurgy technology. Background technique [0002] In recent years, with the large-scale steel structure, high-strength steel and increased thickness are required. Because the traditional large-thickness high-strength steel welding welding input line energy is less than 100KJ / CM, the welding efficiency is low, and there is an urgent need to improve the welding construction efficiency. Further development of high-intensity welding technology. In this situation, a high-strength steel plate for high heat input welding is invented, and a production method of the steel plate is also involved. This is achieved by low carbon and adding an appropriate amount of weak carbide-forming elements to achiev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14
CPCC21D8/0226C21D2211/002C21D2211/005C21D2211/009C22C38/002C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14
Inventor 王培玉叶建军李经涛吴小林潘贵明王柯
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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