Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

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
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
yield strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
elongationaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products