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Low-compression ratio super-strength steel plate for ocean engineering and manufacturing method thereof

An ultra-high-strength, marine engineering technology, applied in the field of metallurgy, can solve the problems of low strength and achieve the effects of increased tensile strength, strong operability, and excellent low-temperature toughness

Inactive Publication Date: 2012-09-26
NANJING IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the strength is low, the yield strength is between 360~370 MPa

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  • Low-compression ratio super-strength steel plate for ocean engineering and manufacturing method thereof
  • Low-compression ratio super-strength steel plate for ocean engineering and manufacturing method thereof
  • Low-compression ratio super-strength steel plate for ocean engineering and manufacturing method thereof

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Embodiment Construction

[0033] A low-compression ratio ultra-high-strength steel plate for marine engineering according to the present invention, the chemical composition of the steel in the steel plate is calculated by weight percentage, C: 0.04-0.07%, Si: 0.10-0.30%, Mn: 1.60-1.80% , P: ≤0.010%, S: ≤0.0080%, Nb: 0.030~0.050%, V: 0.020~0.060%, Ti: 0.006~0.015%, Ni: 0.90~1.30%, Cr: 0.30~0.60%, Cu: 0.20-0.40%, Mo: 0.40-0.60%, the balance is Fe and unavoidable impurities.

[0034] According to the production process of the present invention, the actual chemical composition of the smelting and rolling steel of the present invention is shown in Table 1.

[0035] Table 1 Chemical composition (wt%) of the embodiment of the present invention

[0036] Example C Si mn P S Nb Ti Ni Cr Cu Mo V Example 1 0.065 0.22 1.76 0.0078 0.0075 0.040 0.012 1.00 0.31 0.31 0.49 0.032 Example 2 0.055 0.25 1.69 0.0080 0.0069 0.036 0.011 1.20 0...

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Abstract

The invention discloses a low-compression ratio super-strength steel plate for ocean engineering and a manufacturing method thereof. The super-strength steel plate for ocean engineering comprises the following chemical components in percentage by weight: 0.04-0.07% of C, 0.10-0.30% of Si, 1.60-1.80% of Mn, less than or equal to 0.010% of P, less than or equal to 0.0080% of S, 0.030-0.050% of Nb, 0.020-0.060% of V, 0.006-0.015% of Ti, 0.90-1.30% of Ni, 0.30-0.60% of Cr, 0.20-0.40% of Cu, 0.40-0.60% of Mo, and the balance of Fe and inevitable impurities. The laboratory smelting, trial rolling on a rolling mill, TMCP (thermal mechanical control processing) technology and thermal refining are sequentially performed, thus the super strength, high toughness, weldability and manufacturability of the super-strength steel plate for ocean engineering are realized.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a steel plate and a production method thereof, in particular to a low compression ratio ultra-high strength steel plate for marine engineering and a production method thereof. Background technique [0002] In the 21st century, human beings have entered a new era of ocean development and utilization. International struggles for marine rights centered on the development and possession of marine resources have intensified, and the accompanying competition in marine technology has become increasingly prominent. A large number of facts show that marine science and technology has entered the forefront of global scientific and technological competition and has become one of the focuses of comprehensive strength competition among countries. The development of marine science and technology is inseparable from steel materials. The market demand for steel for marine engineering is increasing, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C21D8/02C21D1/25C21D1/18C21D11/00
Inventor 李恒坤吴年春尹雨群刘朝霞崔强车马俊
Owner NANJING IRON & STEEL CO LTD
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