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Producing method of high-toughness low-alloy constructional steel

A production method and technology of structural steel, applied in the field of production of strong and tough low-alloy structural steel, can solve the problems that performance indicators cannot meet the actual needs of new brake beams, etc., and achieve improved low-temperature impact toughness, pure steel quality, and simple process Effect

Inactive Publication Date: 2008-06-11
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The chemical composition control and production smelting methods of the existing low-alloy high-strength steel can not meet the actual needs of the new brake beam manufacturing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add L08 molten iron and steel scrap to the converter, the ratio of molten iron and steel scrap is (95%-85%): (5%-15%), and then add ferroalloy ferrosilicon: carbon≤0.01%, manganese≤0.4%, silicon 70~ 85%, aluminum ≤ 1.0%, iron balance, ferromanganese: carbon ≤ 1.0%, manganese 75-90%, silicon ≤ 1.0%, iron balance, ferrochromium: carbon ≤ 8.0%, chromium ≥ 60%, silicon ≤ 3%, iron balance, electrolytic nickel: carbon ≤ 0.05%, nickel 99.9-100%, impurity balance, ferromolybdenum: carbon ≤ 0.75%, molybdenum 50-65%, silicon ≤ 1.5%, iron balance, then add The ratio is 20-40% of silicon, 20-40% of aluminum, 9-12% of barium, and a composite deoxidized alloy with iron balance for smelting. Refined in LF furnace, refining temperature: 1500℃~1650℃; composition fine-tuning, slagging and deoxidation, refining time > 30 minutes; argon blowing and stirring throughout; refining slag basicity CaO / SiO2 is 2.0, so that the chemical composition reaches the steel composition It is required to ...

Embodiment 2

[0021] Add L08 molten iron and steel scrap to the converter, the ratio of molten iron and steel scrap is (95%-85%): (5%-15%), and then add ferroalloy ferrosilicon: carbon≤0.01%, manganese≤0.4%, silicon 70~ 85%, aluminum ≤ 1.0%, iron balance, ferromanganese: carbon ≤ 1.0%, manganese 75-90%, silicon ≤ 1.0%, iron balance, ferrochromium: carbon ≤ 8.0%, chromium ≥ 60%, silicon ≤ 3%, iron balance, electrolytic nickel: carbon ≤ 0.05%, nickel 99.9-100%, impurity balance, vanadium iron: carbon ≤ 0.5%, silicon ≤ 2%, vanadium 40-60%, iron balance, then add The alloy ratio is 30%~55% of silicon, 5%~15% of aluminum, 10%~30% of barium, 5%~15% of calcium, and the balance of iron is smelted and refined by LF furnace. Refining temperature: 1500 ℃~1650℃; composition fine-tuning, slagging and deoxidation, refining time > 30 minutes; argon blowing and stirring throughout; refining slag basicity CaO / SiO2 is 3.0, so that the chemical composition meets the steel composition requirements, and is carr...

Embodiment 3

[0023] Add L08 molten iron and steel scrap to the converter, the ratio of molten iron and steel scrap is (95%-85%): (5%-15%), add ferroalloy silicon iron carbon ≤ 0.01%, manganese ≤ 0.4%, silicon 70-85% , aluminum ≤ 1.0%, iron balance, ferromanganese: carbon ≤ 1.0%, manganese 75-90%, silicon ≤ 1.0%, iron balance, ferrochromium: carbon ≤ 8.0%, chromium ≥ 60%, silicon ≤ 3% , iron balance, electrolytic nickel: carbon ≤ 0.05%, nickel 99.9-100%, impurity balance, vanadium iron: carbon ≤ 0.5%, silicon ≤ 2%, vanadium 40-60%, iron balance, ferroniobium: carbon ≤0.05%, silicon ≤2.0%, aluminum ≤2.5%, (niobium + tantalum) 60-70%, iron balance, the final alloy ratio is aluminum 10%-30%, manganese 20%-40%, iron balance The composite deoxidized alloy is smelted. Refined by LF furnace, refining temperature: 1500℃~1650℃; composition fine-tuning, slagging and deoxidation, refining time > 30 minutes; whole process of argon blowing and stirring; refining slag alkalinity CaO / SiO2≤5.0, so that th...

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Abstract

The invention relates the low-alloy high-tensile structural steel and preparing method. The components are as follows: C:0.05%-0.60%, Si: 0.05%-0.70%, Mn: 0.5%-2.5%, P: <= 0.04%, S: <=0.04%, Cr: 0-0.70%, Ni: 0-0.70%, molybdenum: 0-0.60%, Cu: 0-0.20%, vanadium: 0.01%-0.30%, Al 0-0.1%, niobium: 0.001%-0.10%, N: 0.004%-0.02%, and the left is Fe. The method comprises the following steps: using revolving furnace to smelt, and using LF furnace to refine. The yield strength as is above 460Mpa, the dynamic ductility Akv is above 27J at low temperature (-40Deg.C), endurance life is above 2 million times, and the finished steel can be used for train brake beam, engineering machinery and hydraulic support without heat treatment. After quenching and high tempering modified heat treatment, the strength for extension of the steel is above 750Mpa, the dynamic ductility Akv is above 150J at low temperature (-40Deg.C). After carbonization, the steel can be used for abrasion-proof driving mechanism elements and parts.

Description

technical field [0001] The invention relates to a production method of high-toughness low-alloy steel. technical background [0002] The old-fashioned brake beam of railway freight cars was originally made of 8# channel steel, which was processed by means of riveting and welding. Affected by factors such as its structure and materials, the old-fashioned channel steel brake beam was loose, deformed, Defects such as open welding, falling off, and fracture have constituted the main cause of vehicle derailment and overturning accidents. Their safety reliability is poor and their service life is short, resulting in high operating costs, repairs, and maintenance costs for the brake beam. [0003] With the rapid increase of new railways in the country and the expansion of transportation scale, the carrying weight of vehicles has increased many times, and the operating speed has been increased many times. It is also proposed that the speed of operating trucks be increased from 120k...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C22C33/04C21C7/00C21D6/00B22D11/16
Inventor 崔京玉陈京生唐国志许晓东周德光王敏邓素怀宫翠李本海陈明跃
Owner SHOUGANG CORPORATION
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