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A kind of high ductility eh40 ship plate steel and its preparation method

A ship plate steel and ductility technology, applied in the field of metallurgy, can solve the problems of high production cost, low finishing rolling temperature, large rolling mill load, etc., and achieve the effects of reducing MnS inclusions, improving microstructure uniformity, and increasing finishing rolling temperature.

Active Publication Date: 2020-07-10
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The patent with the publication number of CN103882295A discloses a low-temperature high-toughness V-N alloyed ship plate steel and its manufacturing method. In this invention, the Si content is relatively high, so that more red oxide scales are formed on the surface of the steel plate, and the surface quality of the steel is poor; Mn High content, easy to form MnS inclusions, destroy the uniformity of the steel plate structure
[0006] The patent with the publication number CN104911503B discloses an extra-thick quenched and tempered EH40 steel for marine engineering and its preparation. The invention has complicated process, long production cycle and low production efficiency; and precious microalloy elements Nb, V, Ti, higher cost
[0007] The patent with the publication number CN105525203B discloses a high-strength EH40 extra-thick steel plate and its production method. The finishing temperature of the invention is low, and the rolling mill load is large; the composition contains precious element Ni, and the production cost is relatively high.

Method used

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  • A kind of high ductility eh40 ship plate steel and its preparation method
  • A kind of high ductility eh40 ship plate steel and its preparation method
  • A kind of high ductility eh40 ship plate steel and its preparation method

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Effect test

Embodiment 1

[0032] A kind of preparation method that is 28mm high ductility EH40 grade ship plate steel specifically comprises the following process steps:

[0033] step 1:

[0034] According to the composition design, the molten steel was smelted and cast into a billet with a thickness of 135mm. The billet was heated to 1216°C and kept for 1.5 hours. The chemical composition and weight percentage of the billet are shown in Table 1;

[0035] Step 2:

[0036] (1) Rough rolling is carried out on the heated billet for 3 passes, the rolling temperature is 1050°C, the rolling thickness is 135mm→94mm→70mm→53mm, the total cumulative reduction rate is 60.7%, and the intermediate billet with a thickness of 53mm is obtained ;

[0037] (2) After 3 passes of finishing rolling on the intermediate billet, the starting rolling temperature is 960°C, the rolling thickness is 53mm→42mm→34mm→28mm, the total cumulative reduction rate is 47.2%, and the finishing rolling temperature is 900°C. Obtain a steel...

Embodiment 2

[0042] A kind of preparation method that is 31mm high ductility EH40 grade ship plate steel specifically comprises the following process steps:

[0043] step 1:

[0044] According to the composition design, the molten steel was smelted and cast into a billet with a thickness of 140 mm. The billet was heated to 1240 °C and kept for 1 hour. The chemical composition and weight percentage of the billet are shown in Table 1;

[0045] Step 2:

[0046] (1) Carry out 3 passes of rough rolling on the heated billet, the rolling temperature is 1100°C, the rolling thickness is 140mm → 99mm → 75mm → 57mm, the total cumulative reduction rate is 59.3%, and the intermediate billet with a thickness of 57mm is obtained ;

[0047](2) After 3 passes of finish rolling on the intermediate billet, the starting rolling temperature is 950°C, the rolling thickness is 57mm→46mm→38mm→31mm, the total cumulative reduction rate is 45.6%, and the finishing rolling temperature is 920°C. Obtain a steel plat...

Embodiment 3

[0052] A kind of preparation method that is 24mm high ductility EH40 grade ship plate steel specifically comprises the following process steps:

[0053] step 1:

[0054] According to the composition design, the molten steel was smelted and cast into a billet with a thickness of 125 mm. The billet was heated to 1220 °C and kept for 1 hour. The chemical composition and weight percentage of the billet are shown in Table 1;

[0055] Step 2:

[0056] (1) Carry out 3 passes of rough rolling on the heated billet, the rolling temperature is 1100°C, the rolling thickness is 125mm→86mm→62mm→45mm, the total cumulative reduction rate is 64%, and the intermediate billet with a thickness of 45mm is obtained ;

[0057] (2) After 3 passes of finish rolling on the intermediate billet, the starting rolling temperature is 940°C, the rolling thickness is 45mm→36mm→29mm→24mm, the total cumulative reduction rate is 46.7%, and the finishing rolling temperature is 910°C. Obtain a steel plate with ...

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Abstract

A highly ductile EH40 grade ship plate steel and a preparation method thereof, belonging to the field of metallurgical technology; the chemical compositions of the ship plate steel in weight percentage are: C: 0.04-0.08%, Si: 0.04-0.16%, Mn: 0.90 ~1.20%, Nb: 0.03~0.04%, Ti: 0.01~0.02%, Als: 0.02~0.04%, P: ≤0.02%, S: ≤0.01%, the rest is iron and inevitable impurities; EH40 grade ship plate The preparation method of steel: using a steel billet with a thickness of 120 to 140 mm for heating, heat preservation, rough rolling, finish rolling, and cooling to obtain the finished ship plate steel; the present invention uses controlled rolling and controlled cooling technology to obtain a structure of soft phase ferrite and hard phase steel. phase bainite; in addition, no Cr, V, Ni and other elements are added, and the cost is low; the rapid cooling method can be used to appropriately increase the final rolling temperature, reduce the rolling mill load, improve rolling efficiency, and achieve a high ductility EH40 The production of high-grade ship plate steel is low-cost, easy to roll and highly efficient.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high ductility EH40 ship plate steel and a preparation method thereof. Background technique [0002] In recent decades, the problems of overfishing and environmental pollution in offshore fisheries have become increasingly serious. Due to the implementation of the UN Convention on the Law of the Sea, offshore fisheries are gradually transforming into marine fisheries, completing the upgrade from offshore to pelagic. For this reason, the development of ocean-going fishing boats requires not only good strength and toughness matching and stability, but also good low-temperature toughness, high-energy welding performance, and seawater corrosion resistance, so as to cope with the possible problems encountered by the ship during driving. Emergency accidents, the most important issue is the collision safety of ships. The better the ductility of the steel used for the h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C33/04C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0263C22C33/04C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 周晓光刘振宇孙晓青王国栋
Owner NORTHEASTERN UNIV LIAONING