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A non-modulated steel using tellurium to control the morphology of sulfide inclusions and its manufacturing method

A sulfide, non-modulated technology, applied in the field of non-modulated steel and its manufacturing, can solve the problems of difficult operation, low yield, high tellurium element, etc., and achieve the effect of reducing deformation, improving cutting performance and small deformation

Active Publication Date: 2021-07-13
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Barium is in the same family as calcium, and its activity is stronger, the yield is lower, and it is difficult to operate
[0006] Publication number CN 107287504 A, titled "Sulphur- and Tellurium-Containing Medium-Carbon Free-cutting Non-Quenched and Tempered Steel and Its Production Process", uses tellurium mainly to improve the cutting performance of steel, but its tellurium / sulfur ratio is 0.25-2.5 , the addition of tellurium element is obviously high, and the cost is high

Method used

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  • A non-modulated steel using tellurium to control the morphology of sulfide inclusions and its manufacturing method
  • A non-modulated steel using tellurium to control the morphology of sulfide inclusions and its manufacturing method
  • A non-modulated steel using tellurium to control the morphology of sulfide inclusions and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1: A non-modulated steel using tellurium to control the sulfide inclusion form, using a 100-ton EAF electric arc furnace to smelt → LF refining → VD furnace vacuum treatment, after vacuum degassing in the VD furnace, add a core coating to the molten steel A 0.3-0.5mm iron sheet-wrapped tellurium-manganese alloy cored wire is used to adjust the form of MnS inclusions, and the content of tellurium in the cored wire is 30% by mass percentage. .

[0049] Specifically, in this embodiment, the elemental composition of the non-modulated steel contains C: 0.38%, Si: 0.50%, Mn: 1.20%, S: 0.041%, Cr: 0.15%, Ni: 0.02%, Mo : 0.03%, Te: 0.0050%, and the balance is iron and unavoidable impurities. Te / S=0.12, ω[Mn] / ω[S]=29.

[0050] The obtained non-tempered steel was analyzed, the MnS morphology after rolling was detected, and compared with the MnS inclusions in the traditional Te-free rolling material. The macroscopic distribution of MnS in the metallography of traditiona...

Embodiment 2

[0052] Example 2: A non-modulated steel using tellurium to control the sulfide inclusion form, using a 100-ton EAF electric arc furnace for smelting→LF refining→VD furnace vacuum treatment, after vacuum degassing in the VD furnace, add a core coating to the molten steel A 0.3-0.5 mm iron-wrapped tellurium-manganese alloy cored wire is used to adjust the form of MnS inclusions, and the content of tellurium in the cored wire is 60% by mass percentage. .

[0053] Specifically, in this embodiment, the element composition of the non-modulated steel contains C: 0.37%, Si: 0.48%, Mn: 1.35%, S: 0.041%, Cr: 0.17%, Ni: 0.01%, Mo : 0.02%, Te: 0.012%, and the balance is iron and unavoidable impurities. Te / S=0.29, ω[Mn] / ω[S]=33.

[0054] The obtained non-tempered steel was analyzed, the MnS morphology after rolling was detected, and compared with the MnS inclusions in the traditional Te-free rolling material. In this example, the macro distribution of MnS inclusions in the metallographi...

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Abstract

The invention discloses a non-modulated steel which adopts tellurium to control the morphology of sulfide inclusions and a manufacturing method thereof. By adding a small amount of tellurium element to molten steel, the effect of regulating the morphology of MnS can be achieved. Problems with sulfide shape in quenched and tempered steel, improving sulfide rating. In its content control range, when the tellurium content is low, the tellurium is dissolved in MnS to increase the hardness of the inclusions, ensuring a small amount of deformation during rolling; when the tellurium content is high, the precipitated MnTe adheres to the surface of MnS , Due to the low surface energy of MnTe, it can spheroidize MnS inclusions and reduce the proportion of elongated MnS inclusions in the finished steel, thereby reducing the amount of deformation of MnS during forging. The aspect ratio of the sulfide in the finished product is less than or equal to 5, and the ratio of the aspect ratio between 1 and 3 reaches more than 90%, which significantly reduces the long or rod-shaped sulfide, improves the cutting performance of the steel, and prevents the steel from vulcanizing during deformation. aggregates.

Description

technical field [0001] The invention relates to a non-modulated steel and a manufacturing method thereof, in particular to a non-modulated steel using tellurium to control the form of sulfide inclusions and a manufacturing method thereof. Background technique [0002] Non-quenched and tempered steel does not require heat treatment and straightening of the product during the production process, which simplifies the process operation, improves the product yield, reduces energy consumption and reduces environmental pollution, so it is called "green steel". Non-quenched and tempered steel is mainly used in automobile crankshafts, connecting rods, etc. These parts require high surface quality. In order to ensure a certain cutting performance, S element is introduced into non-quenched and tempered steel to improve the cutting performance of steel. Therefore, the inclusions in steel are mainly MnS. Since the MnS inclusions are softer than the steel matrix, they will become slender...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/60C22C38/44C22C38/02C22C38/04C21C7/00
CPCC21C7/0006C21C7/0056C22C38/02C22C38/04C22C38/44C22C38/60
Inventor 周蕾付建勋高亮庆孙华李林张峰魏刚武沈平刘磊刘文学
Owner NANJING IRON & STEEL CO LTD
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