High-surface-quality hot-galvanized transformation induced plasticity (TRIP) steel plate and manufacturing method thereof

A manufacturing method, hot-dip galvanizing technology, applied in the direction of manufacturing tools, hot-dip galvanizing process, heat treatment furnace, etc., can solve the problems of unfavorable widespread promotion and market competition, poor surface coating, poor coating of galvanized finished products, etc., and achieve a good market Demand and application prospects, good cold formability, good effect of coating performance

Active Publication Date: 2017-06-20
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented method allows for better control over properties during manufacture compared to existing methods such as electroplated zinc or aluminum coatings on steel sheets. It results in improved quality products that have superior mechanical characteristics like toughness, impact energy absorbance (EA), rust prevention ability, etc., which makes them ideal materials for use in various applications where they were previously used only due to their poor durability.

Problems solved by technology

This technical problem addressed in this patented relates to improving the durability (resistance against stress), ductility, weldability, work hardness/plenum ratio property, and low costs associated with producing thin strip structures called tension martensites (TMAS)-duckle carburization(TDMaSC) steel grades containing specific compositions of metalloids like chromium, molybaferrite, nickel, tantallochromia, vanadium, nioblasts, magnesiodes, sulfur, phosphorus, boron, nitrides, calcium, cobalt, titan, zirconias, ferroelectric compounds, and their combinations.

Method used

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  • High-surface-quality hot-galvanized transformation induced plasticity (TRIP) steel plate and manufacturing method thereof
  • High-surface-quality hot-galvanized transformation induced plasticity (TRIP) steel plate and manufacturing method thereof
  • High-surface-quality hot-galvanized transformation induced plasticity (TRIP) steel plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A hot-dip galvanized TRIP steel sheet with high surface quality, its chemical composition and weight percentage are: C 0.14%, Mn 1.4%, P 0.020%, S 0.005%, Als 1.50%, and the balance is Fe and unavoidable impurities.

[0062] The manufacturing method of above-mentioned high surface quality hot-dip galvanized TRIP steel plate comprises the following steps:

[0063] (1) Continuous casting and steelmaking;

[0064] After the molten iron is desulfurized by KR, the target S content is 0.005%; LF furnace refining strengthens the control of C, Mn, Als, and P content in the steel; the target temperature of the continuous casting ladle is controlled at 20°C above the liquidus temperature. Dynamic light reduction is used to reduce or eliminate center porosity and center segregation defects.

[0065] (2) hot rolling;

[0066] The casting billet temperature is controlled at 1230°C, and the holding time is 3.0h; the hot rolling finishing temperature is controlled at 880°C; the hot ...

Embodiment 2

[0078] A hot-dip galvanized TRIP steel sheet with high surface quality, its chemical composition and weight percentage are: C 0.12%, Mn 1.60%, P 0.010%, S 0.003%, Als 2.0%, and the balance is Fe and unavoidable impurities.

[0079] The manufacturing method of above-mentioned high surface quality hot-dip galvanized TRIP steel plate comprises the following steps:

[0080] (1) Continuous casting and steelmaking;

[0081] After the molten iron is desulfurized by KR, the target S content is 0.003%; LF furnace refining strengthens the control of C, Mn, Als, and P content in the steel; the target temperature of the continuous casting process is controlled at 25°C above the liquidus temperature. Dynamic light reduction is used to reduce or eliminate center porosity and center segregation defects.

[0082] (2) hot rolling;

[0083] The casting billet temperature is controlled at 1250°C, and the holding time is 2.5h; the hot rolling finishing temperature is controlled at 900°C; the ho...

Embodiment 3

[0094] A hot-dip galvanized TRIP steel sheet with high surface quality, its chemical composition and weight percentage are: C 0.10%, Mn 1.20%, P 0.025%, S 0.004%, Als 1.80%, and the balance is Fe and unavoidable impurities.

[0095] The manufacturing method of above-mentioned high surface quality hot-dip galvanized TRIP steel plate comprises the following steps:

[0096] (1) Continuous casting and steelmaking;

[0097]After the molten iron is desulfurized by KR, the target S content is 0.004%; LF furnace refining strengthens the control of C, Mn, Als, and P content in the steel; the target temperature of the continuous casting ladle is controlled at 17°C above the liquidus temperature. Dynamic light reduction is used to reduce or eliminate center porosity and center segregation defects.

[0098] (2) hot rolling;

[0099] The casting billet temperature is controlled at 1215°C, and the holding time is 3.5h; the hot rolling finishing temperature is controlled at 860°C; the hot ...

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Abstract

The invention discloses a high-surface-quality hot-galvanized transformation induced plasticity (TRIP) steel plate and a manufacturing method thereof. The hot-galvanized TRIP steel plate is prepared from chemical components in percentage by weight as follows: 0.10%-0.15% of C, 1.20%-1.80% of Mn, less than or equal to 0.030% of P, less than or equal to 0.030% of S, 1.20%-2.40% of Als and the balance of Fe and inevitable impurities. The manufacturing method of the TRIP steel plate comprises the steps as follows: continuous casting steelmaking-hot rolling-cold rolling-continuous annealing and hot galvanizing. The structure form of the hot-galvanized TRIP steel plate prepared with the method includes ferrite, bainite, retained austenite and martensite, the grain size grade ranges from Grade 10.5 to Grade 11, the tensile strength ranges from 640 MPa to 670 MPa, the yield strength ranges from 395 MPa to 465 MPa, the ductility is higher than or equal to 30%, the strength and ductility product can be 23GPa% or above, and the plate has the high surface quality, mechanical performance and corrosion resistance.

Description

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Claims

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Application Information

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Owner MAGANG (GROUP) HOLDING CO LTD
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