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260MPa-grade hot-dip galvanized high-strength IF steel and preparation method thereof

A hot-dip galvanizing, high-strength technology, applied in the field of steel manufacturing, can solve the problems of poor resistance to secondary processing brittleness of high-strength IF steel, and achieve the effects of excellent resistance to secondary processing brittleness, cost reduction, and excellent resistance to secondary brittleness

Inactive Publication Date: 2021-07-13
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a 260MPa grade hot-dip galvanized high-strength IF steel and its preparation method, which solves or partially solves the technical problem of poor secondary processing brittleness of high-strength IF steel in the prior art

Method used

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  • 260MPa-grade hot-dip galvanized high-strength IF steel and preparation method thereof
  • 260MPa-grade hot-dip galvanized high-strength IF steel and preparation method thereof
  • 260MPa-grade hot-dip galvanized high-strength IF steel and preparation method thereof

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preparation example Construction

[0030] Based on the same inventive concept, the application also provides a preparation method of 260MPa grade hot-dip galvanized high-strength IF steel comprising the following steps:

[0031] Converter smelting is carried out, and cast slabs are obtained after continuous casting. The weight percentages of the chemical components of the cast slabs are: C: 0.0008-0.003%; Si: 0.06-0.10%; Mn: 0.60-0.70%; P: 0.06-0.075%; Nb: 0.01-0.02%; Ti: 0.015-0.025%; Als: 0.020-0.045%; restricted element S: 0.003% or less; N: 0.003% or less, the balance being Fe;

[0032] The cast strand is heated in a heating furnace.

[0033] Carry out hot rolling, the hot rolling heating temperature is 1220 ℃~1280 ℃, and the final rolling temperature is 910~950 ℃.

[0034] Carry out coiling, coiling temperature is 680~710 ℃.

[0035] Perform pickling.

[0036] Perform cold rolling.

[0037] Perform annealing and hot-dip galvanizing to obtain IF steel.

[0038] On the one hand, Nb and Ti are added alon...

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Abstract

The invention discloses 260MPa-grade hot-dip galvanized high-strength IF steel and a preparation method thereof, and belongs to the technical field of steel manufacturing. The IF steel comprises the following chemical components in percentage by weight of 0.0008 to 0.003% of C, 0.06 to 0.10% of Si, 0.60 to 0.70% of Mn, 0.06 to 0.075% of P, 0.01 to 0.02% of Nb, 0.015 to 0.025% of Ti, 0.020 to 0.045% of Als, less than 0.003% of a limiting element S, less than 0.003% of N, and the balance being Fe. According to the 260MPa-grade hot-galvanized high-strength IF steel and the preparation method thereof, the 260MPa-grade hot-galvanized high-strength IF steel has higher strength, good forming performance and excellent secondary machining brittleness resistance, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of steel production, in particular to a 260MPa hot-dip galvanized high-strength IF steel and a preparation method thereof. Background technique [0002] IF steel is one of the important products of automobile body steel. Its main principle is that under the premise of very low carbon and nitrogen content, carbon and nitrogen compounds are precipitated by adding microalloying elements such as Nb and Ti combined with carbon and nitrogen, thereby Make steel into a state without interstitial atoms. With the development of lightweight, high-strength IF steel can increase the strength by adding solid solution strengthening elements P, Mn, and Si on the basis of IF steel, which has become an ideal choice for the production of some body outer panels, complex reinforcements, and structural parts. Generally speaking, in addition to the high strength brought about by the solid solution strengthening effect, the perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/14C22C38/06C21D8/02C23C2/06C23C2/40
CPCC21D8/0226C21D8/0236C21D2211/005C22C38/002C22C38/004C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C23C2/06C23C2/40
Inventor 潘利波李汉左治江李涵余五新曾凡琮张良
Owner JIANGHAN UNIVERSITY
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