Al+Ti series low-cost high-strength ship plate steel and manufacturing method thereof

A ship plate steel, low-cost technology, applied in low-cost high-strength ship plate steel EH36 and its manufacturing field, can solve the problem of adding more alloy elements, etc., achieve the effects of reducing alloy addition, low alloy cost, and low chemical composition

Inactive Publication Date: 2018-11-30
BAOSTEEL ZHANJIANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Although the products proposed in the above patent documents have the characteristics of low-temperature toughness, alloy weight reduction, and accelerated cooling, the addition of alloy elements is still relatively high.

Method used

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  • Al+Ti series low-cost high-strength ship plate steel and manufacturing method thereof
  • Al+Ti series low-cost high-strength ship plate steel and manufacturing method thereof
  • Al+Ti series low-cost high-strength ship plate steel and manufacturing method thereof

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Embodiment Construction

[0021] The present invention is an Al+Ti series low-cost high-strength ship plate steel, the mass percent of its chemical composition is: C: 0.09-0.1%; Si: 0.15-0.25%; Mn: 1.38-1.48%; P: ≤0.01%; S : ≤0.002; Alt: 0.04-0.06%; Ti: 0.008-0.016%; Ca: 0.0015-0.004%; the balance is Fe and unavoidable trace impurity elements.

[0022] Further, the yield strength of the high-strength ship plate EH36 is ≥355MPa, the tensile strength is 490-620MPa, and the impact energy at -40°C (transverse direction) is ≥34J; the maximum thickness of the finished ship plate steel is 50mm.

[0023] Its manufacturing method includes the following specific steps: S1: design, smelt and cast according to the composition of the steel grade to form a continuous casting slab; S2: heat the continuous casting slab to an average temperature of 980-1080°C, and keep it warm for ≥ 30 minutes; S3: The continuous casting slab is rolled in two stages, the first stage of rolling is the rough rolling stage, and the temper...

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Abstract

The invention discloses Al+Ti series low-cost high-strength ship plate steel. The Al+Ti series low-cost high-strength ship plate steel is manufactured from the chemical components comprising, by mass,0.09%-0.1% of C, 0.15%-0.25% of Si, 1.38%-1.48% of Mn, smaller than or equal to 0.01% of P, smaller than or equal to 0.002% of S, 0.04%-0.06% of Alt, 0.008%-0.016% of Ti, 0.0015%-0.004% of Ca, the balance Fe and unavoidable trace impurity elements. According to the high-strength ship plate steel EH36, only Ti refined grain elements are added on the basis of C-Mn steel, precious metal elements such as Cu, Ni, Cr and Mo are not contained, production is conducted by adopting a TMCP technology, the alloy cost is low, the mechanical property meets the requirements of China classification society material and welding specification-2018, and the maximum thickness can reach 50 mm.

Description

technical field [0001] The invention relates to a low-cost high-strength ship plate steel EH36 with excellent low-temperature toughness and online accelerated cooling and a manufacturing method thereof. Background technique [0002] TMCP (ThermoMechanicalControlProcess: thermomechanical control process) refines austenite grains through controlled rolling, and controls cooling to control the phase transformation structure and phase transformation structure refinement. It can not only improve strength and toughness, but also reduce the amount of alloying elements added, so it has many advantages such as improving welding performance. Based on this, the TMCP process has been widely used in the production of steel plates in recent years, especially in the production of high-strength ship plates that require large heat input welding. However, although the high-strength ship plate steel EH36 produced by the TMCP process on the market is widely used in large-scale shipbuilding, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14C22C33/04C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0263C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 胡战陈国锋丁永浩
Owner BAOSTEEL ZHANJIANG IRON & STEEL CO LTD
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