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Niobium microalloying Mn-B series super-strength steel plate and heat treatment process thereof

A micro-alloying and ultra-high-strength technology, which is applied in the field of material heat treatment, can solve the problems of niobium micro-alloyed boron steel production and heat treatment processes.

Inactive Publication Date: 2012-12-05
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although niobium is a strong oxide and nitride forming element, there are few reports on the manufacturing and heat treatment process of niobium microalloyed boron steel

Method used

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  • Niobium microalloying Mn-B series super-strength steel plate and heat treatment process thereof
  • Niobium microalloying Mn-B series super-strength steel plate and heat treatment process thereof
  • Niobium microalloying Mn-B series super-strength steel plate and heat treatment process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] The thickness of the steel plate is 8mm, and its heat treatment process system is: austenitizing temperature 900°C, water quenching after holding time for 45 minutes. Temper at low temperature at 200°C, hold for 5 hours, and air cool. Sampling and testing, the mechanical properties testing values ​​are shown in Table 1.

[0010]

[0011] Table 1 Tested values ​​of mechanical properties

Embodiment 2

[0013] The steel plate thickness is 8mm, and its heat treatment process system is: austenitizing temperature 910 ℃, water quenching after holding time for 45 minutes. Temper at low temperature at 200°C, hold for 5 hours, and air cool. Sampling and testing, the mechanical properties test values ​​are shown in Table 2.

[0014] Table 2 Tested values ​​of mechanical properties

[0015]

Embodiment 3

[0017] The thickness of the steel plate is 8mm, and its heat treatment process system is: austenitizing temperature 920°C, water quenching after holding time for 45 minutes. Temper at low temperature at 200°C, hold for 5 hours, and air cool. Sampling and testing, the mechanical properties test values ​​are shown in Table 3.

[0018] Table 3 Tested values ​​of mechanical properties

[0019]

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Abstract

The invention discloses a niobium microalloying Mn-B series super-strength steel plate and a heat treatment process thereof and belongs to the technical field of heat treatment of materials. The process is characterized in that a plate blank comprises the following chemical components in percentage by weight: 0.18 to 0.38 percent of C, less than or equal to 0.6 percent of Si, 1.0 to 2.0 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.01 to 0.06 percent of Nb, 0.0005 to 0.0040 percent of B and the balance of Fe and inevitable impurities. According to the heat treatment process system, the austenitizing temperature is 880 to 930 DEG C, and after heat treatment is performed for 0.5 to 3 hours, water quenching is performed; and the tempering temperature is 190 to 280 DEG C, and the heat preservation time is 3 to 40 hours. The thickness of a finished steel plate product is 5 to 30mm, the finished steel plate product is excellent in mechanical property, the tensile strength reaches 1,100 to 1,400Mpa, the yield strength is 900 to 1,100Mpa, and the elongation percentage is 7 to 15 percent.

Description

technical field [0001] The invention discloses a niobium micro-alloyed Mn-B series ultra-high-strength steel plate and a heat treatment process thereof, which belong to the technical field of material heat treatment and relate to micro-alloying and steel plate heat treatment processes. Background technique [0002] Ultra-high-strength steels are widely used in the automotive industry. As we all know, boron-containing steels have attracted much attention because of their special hot formability. It utilizes titanium and boron microalloying method to obtain high formability and extremely high strength through rapid cooling after hot forming. At present, ultra-high-strength steel Mn-B steel plates have begun to be applied and promoted in major automobile manufacturers in Europe, America and Japan. Almost all ultra-high-strength hot-formed steels in the world belong to the boron steel series, because the addition of trace amounts of boron can effectively improve the hardenabil...

Claims

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Application Information

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IPC IPC(8): C22C38/12C21D1/18C21D8/02
Inventor 高志国史文义康利明刘莉
Owner INNER MONGOLIA BAOTOU STEEL UNION
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