Martensite non-tempered high-strength steel with tensile strength larger than or equal to 960 MP and manufacturing method thereof

A technology of tensile strength and manufacturing method, applied in the field of martensitic non-quenched and tempered high-strength steel with tensile strength ≥ 960MP and its manufacturing field, can solve problems such as failure to achieve stable batch production, and achieve excellent mechanical properties and high-quality finished products Effects on quality, yield, and vehicle weight reduction

Inactive Publication Date: 2019-05-24
BENGANG STEEL PLATES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In recent years, my country has also carried out research work on ultra-high-strength steel. The Iron and Steel Research Institute has developed a new microstructure control technology through in-depth research on microalloying technology and the development of new

Method used

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  • Martensite non-tempered high-strength steel with tensile strength larger than or equal to 960 MP and manufacturing method thereof
  • Martensite non-tempered high-strength steel with tensile strength larger than or equal to 960 MP and manufacturing method thereof
  • Martensite non-tempered high-strength steel with tensile strength larger than or equal to 960 MP and manufacturing method thereof

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[0030] Examples,

[0031] According to the method provided by the present invention, a non-quenched and tempered martensitic high-strength steel with a tensile strength of ≥960MP is manufactured. The chemical composition and mass percentage of the test steel are shown in the following table (the rest are iron and inevitable impurities):

[0032] C

[0033] 1. Steelmaking

[0034] 1. Hot metal pretreatment

[0035] Pretreatment into the furnace S≤0.0030wt.%, P≤0.01wt.%, remove the slag; use refined scrap steel.

[0036] 2. Converter

[0037] The converter pulls the carbon with one hit and avoids point blowing; the ladle is purged with argon before tapping to control the tapping port and avoid scattered flow.

[0038] 3. Refining

[0039] The LF+RH dual path process is adopted, and the gas content is strictly controlled. The LF treatment process is required to maintain a slight positive pressure, strictly control the increase of LF, and the required increase of N is ≤10ppm; LF uses active...

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Abstract

The invention belongs to the technical field of steel making, and particularly relates to a martensite non-tempered high-strength steel with tensile strength larger than or equal to 960 MP and a manufacturing method thereof. The technological process of the manufacturing method comprises the steps of pretreatment of liquid iron, converter smelting, LF refining, RH refining, continuous casting, heating, 2300mm hot continuous rolling, controlled cooling, winding, annealing, sampling and function testing. According to the martensite non-tempered high-strength steel with the tensile strength larger than or equal to 960 MP, a non-tempered 960 MPa high-strength hot rolled steel plate has the excellent mechanical property and good machining properties such as cutting and welding, the blank of this type of a domestic steel grade is filled, imported products similar to the steel can be replaced, steel types of enterprises are increased, the high final product quality and the high rate of finished products are achieved, the martensite non-tempered high-strength steel with the tensile strength larger than or equal to 960 MP has great economic benefit.

Description

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Claims

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Application Information

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Owner BENGANG STEEL PLATES
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