MOLTEN Zn-Al-Mg-PLATED STEEL SHEET AND METHOD FOR PRODUCING SAME

A manufacturing method and hot-dip galvanizing technology, applied in hot-dip galvanizing process, manufacturing tools, heat treatment furnace, etc., can solve problems such as processability deterioration and achieve high tensile strength

Pending Publication Date: 2021-11-09
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the workability of materials deteriorates with the increase in strength, so it is desired to establish a technology that can achieve both high strength and workability, such as the maximum tensile strength of 780 MPa or more required in automotive structural members and reinforcement members.

Method used

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  • MOLTEN Zn-Al-Mg-PLATED STEEL SHEET AND METHOD FOR PRODUCING SAME
  • MOLTEN Zn-Al-Mg-PLATED STEEL SHEET AND METHOD FOR PRODUCING SAME

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Embodiment

[0066] One embodiment of the present invention will be described below.

[0067] 〔experiment method〕

[0068] will have figure 1 The slab with the chemical composition shown in is hot-rolled at a heating temperature of 1250°C, a finish rolling temperature of 880°C, an average cooling rate from finish rolling to coiling of 15-70°C / sec, and a coiling temperature of 420-630°C. A hot-rolled steel sheet having a thickness of 1.8 to 2.8 mm was obtained. After the hot-rolled steel plate is pickled, it is cold-rolled at a rolling rate of 45 to 65% to make a plated original plate (steel base material) with a plate thickness of 1.0 mm, which is passed through the continuous hot-dipping production line. Annealing is performed at various temperatures ranging from 750°C to 850°C in a hydrogen-nitrogen mixed gas atmosphere, and cooled to approximately 420°C at a cooling rate of 8°C to 12°C / sec.

[0069] Afterwards, in a state where the surface of the steel sheet is not in contact with th...

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Abstract

Realized is a plated steel sheet that exhibits both strength and workability. In this molten Zn-Al-Mg-plated steel sheet, a steel base material contains, in terms of mass%, 0.050-0.180% of C, 0.001-0.50% of Si, 1.00-2.80% of Mn, 0.01-0.10% of Ti and 0.0005-0.0100% of B. The average particle diameter of cementite following winding in a hot rolling step is 2 [mu]m or less. Following a continuous molten zinc plating step, the metal structure has a ferrite phase and a second phase at an areal ratio of not less than 15% and less than 45%. The second phase is constituted from martensite or martensite and bainite, and has an average crystal grain diameter of 8 [mu]m or less.

Description

technical field [0001] The present invention relates to a hot-dip Zn-Al-Mg steel plate and a manufacturing method thereof. Background technique [0002] In recent years, the demand for high-strength and high-rust-proof steel sheets for the purpose of weight reduction and resource saving in the fields of automobiles and building materials has increased. Since the high-strength, high-corrosion-proof steel sheet is subjected to various processes including press working and bending, it is important to have excellent workability in addition to high strength and high corrosion resistance. However, the workability of materials deteriorates with the increase in strength, so it is desired to establish a technology that can achieve both high strength and workability, such as the maximum tensile strength of 780 MPa or more required in automotive structural members and reinforcement members. [0003] For example, Patent Document 1 discloses a technique for reducing the difference in ha...

Claims

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Application Information

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IPC IPC(8): C21D9/46C22C38/00C22C38/14C22C38/38C23C2/06C23C2/40C23C8/16
CPCC22C38/00C23C2/06C22C38/38C22C38/14C21D9/46C23C2/40C21D8/0205C22C38/32C22C38/06C21D8/0226C22C38/26C22C38/02C22C38/28C22C38/24C22C38/002C22C38/22C23C2/024C23C2/02C23C2/0224C23C2/261C23C2/28C23C2/29C23C8/16C23C28/345C23C28/321C23C2/022C21D2211/003C21D2211/005C21D2211/008
Inventor 植杉真也平田健太郎
Owner NIPPON STEEL CORP
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