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High-toughness low-alloy constructional steel and producing method thereof

A production method and technology for structural steel, which are applied in the field of strong and tough low-alloy steel and its production, can solve the problem that the performance index cannot meet the actual demand of the new brake beam, and achieve improved low-temperature impact toughness, pure steel, and simple process. Effect

Active Publication Date: 2007-02-28
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

[0020] Add L08 molten iron and scrap steel to the converter. The ratio of molten iron to scrap is (95%-85%): (5%-15%), and then ferrosilicon 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, ferrochrome: 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, and The compound deoxidizing alloy with the addition ratio of 20-40% silicon, 20-40% aluminum, 9-12% barium and the balance of iron is smelted. After LF furnace refining, the refining temperature: 1500℃~1650℃; fine adjustment of composition, slag making and deoxidation, refining time> 30 minutes; full argon blowing and stirring; refining slag basicity (CaO / SiO2): 2.0, so that the chemical composition reaches steel Component requirements, continuous casting is carried o...

Embodiment 2

[0022] Add L08 molten iron and scrap steel to the converter. The ratio of molten iron to scrap is (95%-85%): (5%-15%), and then ferrosilicon 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, ferrochrome: 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, and Adding alloy ratio of silicon: 30% to 55%, aluminum 5% to 15%, barium 10% to 30%, calcium 5% to 15%, iron balance composite deoxidizing alloy for smelting, refining through LF furnace, refining temperature :1500℃~1650℃; fine adjustment of composition, slag making and deoxidation, refining time> 30 minutes; full argon blowing and stirring; refining slag basicity (CaO / SiO2): 3.0, so that the chemical composition meets the requirement of steel composition, at 1500℃ Continuou...

Embodiment 3

[0024] Add L08 molten iron and scrap steel to the converter, the ratio of molten iron to scrap steel is (95%-85%): (5%-15%), and 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, ferrochrome: carbon ≤ 8.0%, chromium ≥ 60%, and silicon ≤ 3 %, iron balance, electrolytic nickel: carbon≤0.05%, nickel 99.9-100%, impurity balance, ferrovanadium: carbon≤0.5%, silicon≤2%, vanadium 40-60%, iron balance, ferroniobium: Carbon ≤ 0.05%, silicon ≤ 2.0%, aluminum ≤ 2.5%, (niobium + thallium) 60-70%, iron balance, the final alloy ratio is aluminum 10%-30%, manganese 20%-40%, iron The amount of composite deoxidizing alloy is smelted. After LF furnace refining, the refining temperature: 1500℃~1650℃; fine adjustment of composition, slag making and deoxidation, refining time> 30 minutes; full argon blowing and stirring; refining slag basicity (CaO / SiO2): ≤5.0, so that t...

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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 strong and tough low alloy steel and a production method thereof. technical background [0002] Old-fashioned brake beams for railway freight cars are originally made of 8# channel steel, which is processed by riveting and welding. Affected by factors such as its structure and materials, the old-fashioned channel steel brake beams are loose, deformed, Defects such as welding, falling off, and breakage have constituted the main cause of vehicle derailment and subversion accidents. Its safety and reliability are poor, and its service life is low, resulting in higher operating costs, overhaul and maintenance costs for brake beams. [0003] With the rapid increase of the country's newly built railways and the expansion of the scale of transportation, the weight of vehicles has increased several times and the operation speed has increased several times. It is proposed to increase the operating speed of trucks from 120km / h to 140km / h, t...

Claims

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Application Information

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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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