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Common hot-rolled steel plate with high strength and yield ratio and manufacturing method thereof

A hot-rolled steel sheet and a manufacturing method are applied in the field of high-strength-yield-ratio ordinary hot-rolled steel sheets and their manufacturing fields to achieve the effect of improving the strength-yield ratio

Active Publication Date: 2016-04-13
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no research or report on the relationship between trace boron element and the improvement of the strength-to-yield ratio of ordinary hot-rolled steel sheets

Method used

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  • Common hot-rolled steel plate with high strength and yield ratio and manufacturing method thereof
  • Common hot-rolled steel plate with high strength and yield ratio and manufacturing method thereof
  • Common hot-rolled steel plate with high strength and yield ratio and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The chemical composition of SS400 high-strength and yield-ratio ordinary hot-rolled steel plate with a thickness of 18 mm is: C: 0.15%, Si: 0.22%, Mn: 0.71%, P: 0.013%, S: 0.003%, B: 0.0015 %, others are Fe and residual elements. The test results of its mechanical properties show that the yield strength is 240MPa, the tensile strength is 450MPa, the elongation is 29%, and the strength-to-yield ratio is 1.875.

[0039] The production method of the SS400 high-strength high-yield-ratio ordinary hot-rolled steel plate with a thickness of 18mm provided by the present invention has a process flow of: converter smelting→LF furnace refining→continuous casting→slab heating→rolling→controlled cooling→finishing, including the following step:

[0040] 1. Converter smelting

[0041] Add 102 tons of molten iron and 18 tons of steel scrap into a converter with a nominal capacity of 120 tons. The temperature of the molten iron is 1249°C. The chemical composition in terms of mass perc...

Embodiment 2

[0063] The chemical composition of SS400 high-strength and yield-ratio ordinary hot-rolled steel plate with a thickness of 40 mm is: C: 0.22%, Si: 0.24%, Mn: 0.87%, P: 0.016%, S: 0.010%, B: 0.0020 %, others are Fe and residual elements. The test results of its mechanical properties show that the yield strength is 255MPa, the tensile strength is 480MPa, the elongation is 28%, and the strength-to-yield ratio is 1.882.

[0064] The production method of the SS400 high-strength high-yield-ratio ordinary hot-rolled steel plate with a thickness of 40mm provided by the present invention has a process flow of: converter smelting→LF furnace refining→continuous casting→slab heating→rolling→controlled cooling→finishing, including the following step:

[0065] 1. Converter smelting

[0066] Add 98 tons of molten iron and 17 tons of steel scrap into a converter with a nominal capacity of 120 tons. The temperature of the molten iron is 1246°C. The chemical composition in terms of mass perce...

Embodiment 3

[0087] The chemical composition of Q235B high-strength and yield-ratio ordinary hot-rolled steel plate with a thickness of 12mm is: C: 0.12%, Si: 0.15%, Mn: 0.33%, P: 0.0213%, S: 0.018%, B: 0.0010 %, others are Fe and residual elements. The test results of its mechanical properties show that the yield strength is 235MPa, the tensile strength is 410MPa, the elongation is 33%, and the strength-to-yield ratio is 1.745.

[0088] The production method of the Q235B high-strength high-yield-ratio ordinary hot-rolled steel plate with a thickness of 12mm provided by the present invention has a process flow of: converter smelting→LF furnace refining→continuous casting→slab heating→rolling→controlled cooling→finishing, including the following step:

[0089] 1. Converter smelting

[0090] Add 100 tons of molten iron and 20 tons of steel scrap into a converter with a nominal capacity of 120 tons. The temperature of the molten iron is 1250°C. The chemical composition in terms of mass perc...

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Abstract

The invention discloses a high-tensile-to-yield-ratio common hot rolled steel plate and a making method thereof. The high-tensile-to-yielding-ratio common hot rolled steel plate comprises, by mass, 0.12-0.22% of C, 0.12-0.30% of Si, 0.30-0.90% of Mn, 0.025% or less of P, 0.025% or less of S, 0.0010-0.0020% of B, and the balance Fe and residual elements. The making method of the high-tensile-to-yielding-ratio common hot rolled steel plate comprises the steps of converter smelting, LF furnace refining, continuous casting, plate blank heating, rolling, controlled cooling and finishing. The making method of the high-tensile-to-yielding-ratio common hot rolled steel plate has a low production cost, changes very small chemical components of a common hot rolled steel plate and almost changes no microscopic structure of the common hot rolled steel plate. The addition of the boron element is very small, so the influence on the processing making cost of the common hot rolled steel plate is very small. The addition of 10-20ppm of the boron element to low carbon steel increases the tensile strength of steel by 5-15MPa and decreases the yield strength by 30-50MPa, so the tensile-to-yield ratio of the steel is substantially improved.

Description

technical field [0001] The invention belongs to the technical field of common hot-rolled steel plates, and in particular relates to a high-strength-yield-ratio common hot-rolled steel plate and a manufacturing method thereof. Background technique [0002] Ordinary hot-rolled steel plates usually refer to carbon structural steel and low-alloy structural steel hot-rolled thin plates and medium-thick plates that are used under ordinary conditions and are mainly used in engineering, construction and other general structures. The carbon content is generally not more than 0.30 %, when used, will be welded in most cases. It is the most widely used and most widely used steel material product, and it is also one of the steel products with the largest export trade volume in my country. [0003] For ordinary hot-rolled steel sheets, the commonly used strength indicators include yield strength and tensile strength. There is a certain difference in the material capabilities reflected b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C21C5/28C21C7/072C21D8/02
CPCY02P10/20
Inventor 王耀山刘国良姜军
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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