A kind of cold-rolled hot-dip galvanized steel and its manufacturing method

A manufacturing method, hot-dip galvanizing technology, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problems of large cold rolling reduction, small dew point range of annealing furnace, and increased production difficulty, etc. Achieve the effect of improving formability, improving work hardening ability, elongation and hole expansion rate

Active Publication Date: 2022-06-28
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the technical solution disclosed in this patent document, although the hot-dip galvanized dual-phase steel has good flanging performance, the cold rolling reduction is relatively large, and the dew point range of the annealing furnace is too small, which increases the difficulty of production

Method used

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  • A kind of cold-rolled hot-dip galvanized steel and its manufacturing method
  • A kind of cold-rolled hot-dip galvanized steel and its manufacturing method
  • A kind of cold-rolled hot-dip galvanized steel and its manufacturing method

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Embodiment 1-6

[0063] The cold-rolled hot-dip galvanized steel of embodiment 1-6 adopts the following steps to make:

[0064] (1) Smelting and casting are carried out according to the mass percentage of each chemical element shown in Table 1.

[0065] (2) Hot rolling: the slab is heated at 1100-1270°C, the holding time is 0.5-3 hours, the final rolling temperature is controlled to be 800-950°C, and the coiling temperature is 400-650°C.

[0066] (3) Pickling.

[0067] (5) Cold rolling: control the deformation of cold rolling to be 35-85%.

[0068] (5) Recrystallization annealing of hot-dip galvanizing: heating the cold-rolled sheet to the soaking temperature T 1 Keep warm for a period of time t 1 , the soaking rate is recorded as V 1 ; Then the steel plate after soaking is heated at the first cooling speed V 2 to intermediate temperature T 2 , and then at the second cooling rate V 3 Cool to T 3 , keep warm for a period of time t 3 Then heat up to the zinc bath temperature T 4 Keep w...

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Abstract

The invention discloses a cold-rolled hot-dip galvanized steel, whose chemical element mass percentage ratio is: C: 0.06-0.14%, Mn: 1.3-2.4%, Si: 0.1-1.0%, and the balance is Fe and unavoidable Impurities; its microstructure is ferrite + martensite + bainite + retained austenite. In addition, the present invention also discloses the manufacturing method of the above-mentioned cold-rolled hot-dip galvanized steel, which includes the steps: (1) smelting and casting; (2) hot rolling; (3) pickling; (4) cold rolling; (5) ) Hot-dip galvanizing recrystallization annealing: heating the cold-rolled sheet to the soaking temperature T 1 heat preservation for a period of time; then the steel plate after soaking is brought to the intermediate temperature T at the first cooling rate 2 , and then cooled to T at the second cooling rate 3 , hold for a period of time and then heat up to the zinc pool temperature T 4 Keep warm for a period of time; among them, the cooling rate is less than the second cooling rate, 640℃≤T 2 ≤T 1 , Ms<T 3 ≤T 4 (6) cooled to room temperature.

Description

technical field [0001] The invention relates to a steel grade and a manufacturing method thereof, in particular to a hot-dip galvanized steel and a manufacturing method thereof. Background technique [0002] In addition to good manufacturability, good mechanical properties and corrosion resistance, hot-dip galvanized dual-phase steel has been widely used in body structures and reinforcements. In recent years, with the increasingly complex design of the body structure, the traditional hot-dip galvanized dual-phase steel is difficult to guarantee the hole reaming and flanging performance due to the large strength difference between the martensite and ferrite phases, and cannot meet the requirements of some parts. Design requirements of the body structure. Therefore, it is particularly important to develop steels with high formability without increasing the cost and difficulty of manufacturability. [0003] For example: the publication number is CN102719751A, the publication ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C38/28C22C38/26C22C38/22C22C38/16C22C38/14C22C38/12C22C38/06C22C38/04C22C38/02C22C33/04C23C2/06C21D1/26C21D8/02
CPCC22C38/38C22C38/28C22C38/26C22C38/22C22C38/16C22C38/14C22C38/12C22C38/06C22C38/04C22C38/02C22C38/002C22C38/001C22C33/04C23C2/06C21D1/26C21D8/0205C21D8/0226C21D8/0236C21D2211/001C21D2211/002C21D2211/005C21D2211/008
Inventor 王俊峰何承先王利
Owner BAOSHAN IRON & STEEL CO LTD
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