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High-heat input welding tolerating E36-grade steel plate with thickness of 100nm for ocean engineering

An offshore engineering and line energy technology, which is applied to 100mm thick E36 marine engineering steel and its manufacturing field with high resistance to large line energy, can solve the problem of welding without large line energy resistance, unable to meet high line energy welding, and low welding efficiency and other problems, to achieve the effect of reducing the source of microcracks after welding, comprehensive mechanical properties at high and normal temperature, and improving toughness

Inactive Publication Date: 2015-03-25
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extra-thick plates disclosed in these invention patents all have a thickness of 100mm or more, but they do not have the ability to resist high-energy-input welding. During welding, the high-input energy welding method exceeding 50kJ / cm cannot be used for welding, and the construction efficiency is low.
[0004] The characteristics of the steel plates invented in the above patents are: (1) The thickness specifications of the steel plates that can meet the requirements of large heat input welding are all ≤ 80 mm, which is not suitable for some structural construction occasions that require steel plates with a thickness greater than 80 mm; (2) ) The steel plate with a thickness specification > 80mm cannot meet the requirements of large heat input welding, and the welding efficiency is low when manufacturing the structure

Method used

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  • High-heat input welding tolerating E36-grade steel plate with thickness of 100nm for ocean engineering
  • High-heat input welding tolerating E36-grade steel plate with thickness of 100nm for ocean engineering
  • High-heat input welding tolerating E36-grade steel plate with thickness of 100nm for ocean engineering

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Smelt molten steel according to the target chemical composition shown in Example 1 of Table 1, accurately control the order of alloy addition during the smelting process, and sequentially add Si, Mn, Ti, Ni, Cu, Nb, and Al to achieve the target chemical composition for continuous casting. The resulting continuous casting slab has a thickness of 300mm; using the production process shown in Example 1 of Table 2, rolled into a 100mm thick steel plate, and then normalized at 890°C×200min.

Embodiment 2

[0021] Smelt molten steel according to the target chemical composition shown in Example 2 of Table 1, accurately control the order of alloy addition during the smelting process, and add Si, Mn, Ti, Ni, Cu, Nb, and Al in turn, and continue casting after reaching the target chemical composition. The resulting continuous casting slab has a thickness of 300mm; the production process shown in Example 2 of Table 2 is used to roll into a 100mm thick steel plate, which is then normalized at 910°C×120min.

Embodiment 3

[0023] Smelt molten steel according to the target chemical composition shown in Example 3 of Table 1, accurately control the order of alloy addition during the smelting process, and sequentially add Si, Mn, Ti, Ni, Cu, Nb, and Al to reach the target chemical composition and then perform continuous casting. The thickness of the continuous casting billet is 320mm; using the production process shown in Example 3 of Table 2, rolled into a 100mm thick steel plate, and then normalized at 930°C×180min.

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Abstract

The invention relates to a high-heat input welding tolerating E36-grade steel plate with a thickness of 100nm for ocean engineering and a manufacturing method thereof. The content of carbon in the steel plate is 0.10-0.18wt% of carbon, and the content of carbon equivalent in the steel plate is 0.43-0.46%. The manufacturing method of the steel plate comprises the steps of pretreating of molten iron, smelting with a converter, LF refining, RH refining, continuous casting, heating of a cast blank, rolling, controlled cooling and normalizing. Si, Mn, Al, Ti, Ni, Cu, V and Nb are added in sequence during smelting to ensure that the compression ratio is more than or equal to 3.0 and the thickness of a continuously cast blank is more than or equal to 300nm, then the continuously cast blank is rolled into a steel plate with a thickness of 100nm by adopting the TMCP, and the steel plate is subjected to normalizing treatment at the temperature of 880-940 DEG C. The steel plate provided by the invention is a normalized extra-thick high-heat input welding tolerating steel plate for an ocean platform. When heat of 50-200kJ / cm or higher is input to the steel plate, and the steel plate is welded, the coarse grain heat affected zone can bear the average impact energy being more than 50J at the temperature of 40 DEG C below zero, and thus the strength and the toughness of welding heat affected zone can be guaranteed effectively.

Description

Technical field [0001] The invention belongs to the technical field of high-strength structural steel plates for welding, and particularly relates to a 100mm thick anti-large heat input steel for welding E36 marine engineering and a manufacturing method thereof. Background technique [0002] With the development of large-scale steel structures, some important stress-bearing parts of the steel structure should be made of extra-thick plates with a thickness of more than 80mm. When the structure is manufactured, if the traditional welding input energy (generally less than 50kJ / cm) is used for welding , Multi-layer and multi-pass welding are required, and the construction efficiency is very low. Single-sided submerged arc welding, gas-electric vertical welding and electroslag welding and other large heat input welding technologies have become modern steel due to their high deposition efficiency, fast welding speed, good welding quality, energy saving, convenient operation and easy au...

Claims

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Application Information

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IPC IPC(8): C22C38/16C22C33/04
CPCC21D8/0226C22C33/04C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16
Inventor 邓伟崔强吴年春尹雨群
Owner NANJING IRON & STEEL CO LTD