Copper-strengthened low-alloy high-strength steel for hot-dip galvanizing

A hot-dip galvanizing and low-alloy technology, applied in hot-dip galvanizing process, metal material coating process, coating, etc., can solve the problems of unfavorable precipitated phases, waste of Ti, Nb, etc., to ensure the performance of high-strength steel and reduce Effect of Metallurgical Costs

Active Publication Date: 2016-08-10
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of steel contains more Ti and / or Nb elements, not only wasting Ti and Nb, but also strong carbon, sulfur, nitrogen compound forming elements such as Ti and Nb are not conducive to Cu 2 Formation of S precipitated phase

Method used

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  • Copper-strengthened low-alloy high-strength steel for hot-dip galvanizing
  • Copper-strengthened low-alloy high-strength steel for hot-dip galvanizing
  • Copper-strengthened low-alloy high-strength steel for hot-dip galvanizing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The chemical composition percentages of the copper-strengthened low-alloy high-strength steel for hot-dip galvanizing provided in this example are: C: 0.1%, Si: 0.01%, Mn: 0.45%, P: 0.01%, S: 0.008%, Cu: 0.02%, Alt: 0.053%, and the rest are Fe and trace alloy elements. The hot-dip galvanized high-strength steel produced with this chemical composition ratio contains fine Cu 2 S precipitates, such as figure 1 shown. The matrix metallographic structure is ferrite + cementite, such as figure 2 shown. The elongation after breaking reaches 30%, the yield strength reaches 300MPa, and the tensile strength reaches 400MPa. image 3 As shown, it meets the requirements for HX260LAD+Z in GT / T2518-2008.

Embodiment 2

[0035]The difference between this example and Example 1 is that the chemical composition percentages of the copper-strengthened low-alloy high-strength steel for hot-dip galvanizing provided in this example are: C: 0.11%, Si: 0.03%, Mn: 1.4% , P: 0.01%, S: 0.018%, Cu: 0.2%, Alt: 0.065%, and the rest are Fe and trace alloy elements. Its elongation reaches 20%, the yield strength reaches 440MPa, and the tensile strength reaches 500MPa, meeting the requirements for HX420LAD+Z in GT / T2518-2008. Other places are completely consistent with embodiment 1.

Embodiment 3

[0037] The difference between this example and Example 1 is that the chemical composition percentages of the copper-strengthened low-alloy high-strength steel for hot-dip galvanizing provided in this example are: C: 0.04%, Si: 0.02%, Mn: 0.6% , P: 0.02%, S: 0.01%, Cu: 0.1%, Alt: 0.053%, and the rest are Fe and trace alloy elements. Its elongation reaches 25%, the yield strength reaches 330MPa, and the tensile strength reaches 430MPa, meeting the requirements for HX300LAD+Z in GT / T2518-2008. Other places are completely consistent with embodiment 1.

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Abstract

The invention discloses copper-strengthened low-alloy high-strength steel for hot dip galvanizing. The copper-strengthened low-alloy high-strength steel comprises the following chemical components in percentage by weight: more than or equal to 0.04 percent and less than or equal to 0.11 percent of C, more than or equal to 0.4 percent and less than or equal to 1.4 percent of Mn, more than or equal to 0.02 percent and less than or equal to 0.2 percent of Cu, more than or equal to 0.01 percent and less than or equal to 0.05 percent of Si, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, more than or equal to 0.015 percent of Alt and the balance of Fe and trace elements. According to the copper-strengthened low-alloy high-strength steel for hot dip galvanizing, the silicon content is low, Nb, Ti and precious metal elements are replaced by fewer copper elements for strengthening the low-alloy high-strength steel, the requirement of GT / T2518-2008 can be met under the condition that hot cracking tendency is not generated, the performance of the high-strength steel is guaranteed, and the metallurgical cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of metal material processing, in particular to copper-strengthened low-alloy high-strength steel for hot-dip galvanizing. Background technique [0002] Hot-dip galvanized low-alloy high-strength steel sheets are now widely produced by continuous annealing after cold rolling, and are widely used in the forming of automotive structural parts, such as rear partition beams, door outer panel reinforcements, etc. This type of steel generally adopts composite alloying design, based on Nb and Ti alloying, adding Si, Mn and other elements to improve the strength of the steel plate. According to the requirements of GT / T2518-2008 for this steel type, taking HX260LAD+Z as an example, its composition is: C≤0.11%, Si≤0.5%, Mn≤0.60%, P≤0.025%, S≤0.025%, Alt ≥0.015%, Nb≤0.09%, Ti≤0.15%, and the balance is Fe. [0003] The actual use of this steel has the following problems: [0004] During the annealing process of the st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C23C2/06
Inventor 蒋光锐刘李斌滕华湘尉冬朱国森
Owner SHOUGANG CORPORATION
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