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Structural steel plate for normalizing hull and preparation method thereof

A technology for structural steel plates and hulls, which is applied in the field of structural steel plates for normalizing hulls and its preparation, can solve the problems of easy cracks in steel plates and high alloy costs, and achieve low production costs and stable mechanical properties

Inactive Publication Date: 2018-02-02
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent adds 0.10-0.30% Cu, the cost of the alloy is high, and the steel plate is prone to cracks

Method used

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  • Structural steel plate for normalizing hull and preparation method thereof

Examples

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Embodiment 1

[0028] Example 1 A kind of structural steel plate for normalizing hull and its preparation method

[0029] According to the chemical composition, process flow and specified process conditions provided by the present invention, molten steel is smelted on a 210-ton converter, cast into a 300mm thick slab, and a 60mm steel plate is rolled on a 4300mm wide and thick plate rolling mill.

[0030] The chemical composition of the steel plate is: C 0.16%, Si 0.32%, Mn 1.50%, P 0.012%, S 0.003%, Als 0.031%, Nb 0.041%, V 0.058%, Ti 0.016%.

[0031] Its production process is as follows: blast furnace hot metal→hot metal pre-desulfurization→converter smelting→deoxidation alloying→LF refining→RH refining→slab continuous casting→slab off-line stacking slow cooling→slab cleaning→slab reheating→4300 Rolling mill controlled rolling → Mulpic controlled cooling → flaw detection → normalizing heat treatment → finished product sampling inspection → storage.

[0032] details as follows:

[0033] (...

Embodiment 2

[0044] Example 2 A kind of structural steel plate for normalizing hull and its preparation method

[0045] According to the chemical composition, process flow and specified process conditions provided by the present invention, the molten steel is smelted on a 210-ton converter, cast into a 300mm thick slab, and rolled into an 80mm steel plate on a 4300mm wide and thick plate rolling mill.

[0046] The chemical composition of the steel plate is: C 0.16%, Si 0.32%, Mn 1.50%, P 0.012%, S 0.003%, Als 0.031%, Nb 0.041%, V 0.058%, Ti 0.016%.

[0047] Its production process is as follows: blast furnace hot metal→hot metal pre-desulfurization→converter smelting→deoxidation alloying→LF refining→RH refining→slab continuous casting→slab off-line stacking slow cooling→slab cleaning→slab reheating→4300 Rolling mill controlled rolling → Mulpic controlled cooling → flaw detection → normalizing heat treatment → finished product sampling inspection → storage.

[0048] details as follows:

[00...

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Abstract

The invention relates to a structural steel plate for normalizing a ship body and a preparation method of the structural steel plate. The thickness specification of the structural steel plate for normalizing the ship body ranges from 60 mm to 80 mm. The steel plate is prepared from, by mass percent, 0.12%-0.18% of C, 0.20%-0.50% of Si, 1.20%-1.60% of Mn, not larger than 0.015% of P, not larger than 0.005% of S, 0.015%-0.050% of Als, 0.020%-0.060% of Nb, 0.030%-0.070% of V, 0.005%-0.020% of Ti and the balance Fe and inevitable impurities. Nb, V and Ti refined grain elements, a continuous casting blank with the thickness being 300 mm and a normalizing technology are adopted for producing the EH36-level high-strength ship plate, the production cost is low, and the mechanical property is stable.

Description

technical field [0001] The invention belongs to the technical field of structural steel for ships and marine engineering, and in particular relates to a structural steel plate for normalizing hulls and a preparation method thereof. Background technique [0002] Since the beginning of the new century, the domestic shipbuilding industry has developed rapidly, and the number of shipbuilding completions, new orders received, and orders in hand have all ranked among the top in the world for many years, and the demand for ship plates has always been at a high level. Affected by the economic crisis in recent years, the demand for shipboards in the shipbuilding industry has decreased. At the same time, the quality requirements for shipboards have become higher and higher, and the competition in the shipboard market has become more intense. In this context, the development and promotion of high-quality and low-cost shipboard is the general trend. [0003] The patent with the notific...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/12C22C38/14C21D8/02C21D1/28C22C33/04
CPCC21D1/28C21D8/0221C21D8/0247C22C33/04C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 王焕洋徐洪庆刘晓东李旺生朱延山王福同贾希光靳立山张海民
Owner SHANDONG IRON & STEEL CO LTD