Low-temperature high-toughness ship plate steel and production method thereof

A production method and technology of ship plate steel, applied in the field of steel smelting, can solve the problems of small thickness of ship plate steel, poor low-temperature impact toughness and yield strength, etc., and achieve the effects of small quality fluctuation, good low-temperature impact toughness, and stable product performance

Inactive Publication Date: 2010-11-03
WUYANG IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the thickness of ship plate steel is relatively small, which cannot meet the requirements of future use, and the low temperature impact toughness and yield strength are relatively poor.

Method used

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  • Low-temperature high-toughness ship plate steel and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Low temperature and high toughness ship plate steel, the composition mass percentage of ship plate steel is: C: 0.11%, Si: 0.26%, Mn: 1.50%, P: 0.008%, S: 0.003%, Ni: 0.40%, Cr: 0.06% , Cu: 0.05%, Mo: 0.009%, Nb: 0.03%, Ti: 0.003%, and the rest are Fe and inevitable impurities.

[0022] The production method of low temperature and high toughness ship plate steel comprises the following steps:

[0023] (1) smelting process: the molten steel containing the above-mentioned components is sent to the LF refining furnace for refining after being smelted in an electric furnace, after the refining is completed, the vacuum treatment of the hanging bag VD furnace is carried out, and the SiCa block is added before the vacuum, and the consumption of SiCa is 1kg / ton steel, and the vacuum The temperature is 0.5 Torr, and the vacuum is broken when the vacuum is kept for 25 minutes;

[0024] (2) Casting process: After the vacuum is broken, the temperature is kept at 1330-1340 °C, and ...

Embodiment 2

[0032] Low temperature and high toughness ship plate steel, the composition mass percentage of ship plate steel is: C: 0.10%, Si: 0.20%, Mn: 1.42%, P: 0.009%, S: 0.003%, Ni: 0.27%, Cr: 0.04% , Cu: 0.20%, Mo: 0.020%, Nb: 0.022%, Ti: 0.002%, and the rest are Fe and inevitable impurities.

[0033] The production method of low temperature and high toughness ship plate steel comprises the following steps:

[0034] (1) smelting process: the molten steel containing the above-mentioned components is sent into the LF refining furnace for refining after being smelted by an electric furnace, after the refining is completed, the vacuum treatment of the hanging bag VD furnace is carried out, and the SiCa block is added before the vacuum, and the consumption of SiCa is 0.5kg / ton steel, The vacuum degree is 0.4 Torr, and the vacuum is broken when the vacuum is kept for 15 minutes;

[0035] (2) Casting process: After the vacuum is broken, the temperature is kept at 1330-1340 °C, and casting ...

Embodiment 3

[0043]Low temperature and high toughness ship plate steel, the composition mass percentage of ship plate steel is: C: 0.15%, Si: 0.30%, Mn: 1.30%, P: 0.009%, S: 0.003%, Ni: 0.20%, Cr: 0.15% , Cu: 0.12%, Mo: 0.005%, Nb: 0.015%, Ti: 0.01%, and the rest are Fe and inevitable impurities.

[0044] The production method of low temperature and high toughness ship plate steel comprises the following steps:

[0045] (1) smelting process: the molten steel containing the above-mentioned components is sent into the LF refining furnace for refining after being smelted in an electric furnace, after the refining is completed, the vacuum treatment of the hanging bag VD furnace is carried out, and the SiCa block is added before the vacuum, and the consumption of SiCa is 0.7kg / ton steel, The vacuum degree is 0.45 Torr, and the vacuum is broken when the vacuum is kept for 20 minutes;

[0046] (2) Casting process: After the vacuum is broken, the temperature is kept at 1330-1340 °C, and casting i...

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Abstract

The invention discloses a low-temperature high-toughness ship plate steel which comprises the following components in percentage by mass: at most 0.16% of C, 0.10-0.50% of Si, 0.90-1.60% of Mn, at most 0.025% of P, at most 0.025% of S, at most 0.80% of Ni, at most 0.20% of Cr, at most 0.35% of Cu, at most 0.08% of Mo, at most 0.02% of Ti, and balance of Fe and inevitable impurities. The production method comprises the following steps: electrosmelting, LF external refining, vacuuming with a VD furnace, casting, heating, controlled-rolling, straightening, shot-blasting, quenching, normalizing and cutting to obtain the finished steel plate. The steel plate has the advantages of reasonable design of chemical components, low cost, large thickness (up to 110 mm), high strength (Re>=350 MPa, Rm>=480MPa, A5 / %>=35) and high toughness under low-temperature impact, and the longitudinal impact work at -60 DEG C is greater than or equal to 250 J. The invention has the advantages of simple production technique, stable product performance and small quality fluctuation.

Description

technical field [0001] The invention belongs to the technical field of steel smelting, and particularly relates to a low-temperature and high-toughness ship plate steel and a production method thereof. Background technique [0002] Ship plate steel is mainly used to manufacture the hull and deck of ships. Due to the special working environment of ships, the performance requirements of ship plate steel are relatively strict. First, good low temperature impact toughness is required, and secondly, high yield strength is required. With the substantial growth of shipbuilding output and the requirements of large-scale, specialized and high-tech ships, the trend of shipbuilding steel is that the width and thickness of shipbuilding steel will increase, the quality will be further improved, and there will be more varieties. At present, the thickness of ship plate steel is relatively small, which cannot meet the requirements of future use, and the low temperature impact toughness and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/50C21C5/52B21B1/46B21B37/74B21B37/16C21D1/18C21D1/28
CPCY02P10/20
Inventor 吴天育高大伟王亚祺侯彩霞刘利香
Owner WUYANG IRON & STEEL
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