A low-cost manufacturing method of non-quenched and tempered steel for automobiles

A technology of non-quenched and tempered steel and a manufacturing method, applied in the field of alloy steel production, can solve the problem of high manufacturing cost, and achieve the effects of shortening smelting cycle, saving raw materials and reducing oxygen activity

Active Publication Date: 2017-11-17
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a low-cost manufacturing method of non-quenched and tempered steel for automobiles, which solves the problem of high manufacturing costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment provides a method for manufacturing F45MnVS non-quenched and tempered steel for automobiles.

[0026] The manufacturing process is electric furnace smelting→LF refining→200mm billet protective casting→slab slow cooling→walking furnace heating→bar rolling→cooling bed slow cooling→flaw detection→product storage.

[0027] When the electric furnace is smelted, the amount of molten iron charged is 100%, and the total furnace capacity is 70 tons. The furnace wall oxygen lance is used to blow oxygen for smelting. The oxygen consumption is 43m3 / ton of molten steel. The carbon content at the end of the electric furnace smelting is 0.26wt%. % steel core aluminum is deoxidized, the amount of aluminum per ton of molten steel is 0.39 kg, and the oxygen activity in molten steel is 0.0128%. At the end of LF refining, sulfur iron is used to increase sulfur. After LF treatment, argon is blown weakly for more than 15 minutes. At the same time, 40 meters of calcium wire is...

Embodiment 2

[0031] This embodiment provides a method for manufacturing F38MnVS non-quenched and tempered steel for automobiles.

[0032] Manufacturing process is the same as embodiment 1.

[0033] When the electric furnace is smelting, the amount of molten iron charged is 100%, the total furnace capacity is 70 tons, the oxygen consumption is 57m3 / ton of molten steel, the carbon content of the end point of electric furnace smelting is 0.21%, and 80 kg of steel core aluminum containing 55% of aluminum is added to the ladle for deoxidation. The amount of aluminum is 0.62 kg, and the oxygen activity in molten steel is 0.0150%. At the end of LF refining, sulfur iron is used to increase sulfur. After LF treatment, argon is blown weakly for more than 15 minutes. At the same time, 70 meters of calcium wire is fed, and the amount of calcium used per ton of molten steel is 0.079 kg. The continuous casting process adopts full protection casting, mold electromagnetic stirring, casting according to 4...

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PUM

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Abstract

The invention discloses a low-cost manufacturing method for non-quenched and tempered steel for a car, and belongs to the technical field of alloy steel production. The low-cost manufacturing method comprises the following steps: carrying out adaptive modification on an electric furnace, and shortening a smelting period within 45 minutes; carrying out full molten iron smelting, wherein charging amount of the molten iron is 90%-100%; controlling end point carbon content of molten steel to 0.10-0.30wt% and controlling oxygen activity in the molten steel to 0.010-0.020% by utilizing an eccentric bottom tapping mode of an electric furnace; reducing aluminum dosage to 0.35-0.70 kilogram / ton of molten steel; controlling oxygen activity in the molten steel to 0.0003-0.0005%; adding a calcium line into the molten steel, wherein the calcium dosage is 0.04-0.08 kilogram / ton of molten steel; and reducing oxygen content in non-quenched steel to be lower than 0.0020wt%. The low-cost manufacturing method has the advantages that the production cost is low, and using requirements of the non-quenched and tempered steel for the car are met.

Description

technical field [0001] The invention belongs to the technical field of alloy steel production, in particular to a low-cost manufacturing method of non-quenched and tempered steel for automobiles. Background technique [0002] Non-quenched and tempered steel is an energy-saving and environmentally friendly steel developed in the 1970s and 1980s. Compared with traditional quenched and tempered steel, it omits quenched and tempered heat treatment, reduces environmental pollution caused by heat treatment; improves cutting performance, Reduced cutting costs. Therefore, non-quenched and tempered steel has been widely used, and its main application fields include automobiles, construction machinery, fasteners, etc. [0003] With the lightweight of auto parts, non-quenched and tempered steels for automobiles are developing towards high strength. At the same time, the requirements for toughness and fatigue performance of non-quenched and tempered steels have not decreased, but have ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C21C5/52C21C7/06
CPCY02P10/20
Inventor 马跃诸葛铭毅陈京生孙齐松毕洪志韩伟佟倩罗志俊张慧峰崔京玉
Owner SHOUGANG CORPORATION
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