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A ferritic heat-resistant steel containing manganese, sulfur and tungsten and its preparation method

A ferritic and heat-resistant steel technology, applied in the field of ferritic heat-resistant steel, can solve the problems of reducing material stability and achieve the effects of improving cutting performance, avoiding work hardening, and improving forming efficiency

Active Publication Date: 2022-04-15
WESCAST IND CHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat-resistant steel contains Co, Mo, V, Nb, N and other alloying elements. Hard spots such as oxides, nitrides, and carbides formed by alloying elements will split the matrix structure and reduce the stability of the material.

Method used

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  • A ferritic heat-resistant steel containing manganese, sulfur and tungsten and its preparation method
  • A ferritic heat-resistant steel containing manganese, sulfur and tungsten and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A ferritic heat-resistant steel containing manganese, sulfur and tungsten, its chemical composition mass percent is: C: 0.37%, Si: 1.81%, Mn: 1.47%, P: 0.028%, S: 0.043%, Cr: 19.5% , W: 1.91%, the balance is Fe and unavoidable impurities.

[0047] The preparation method of ferritic heat-resistant steel containing manganese, sulfur and tungsten comprises the following steps:

[0048] S1. Put the raw materials into the intermediate frequency induction furnace, and carry out the slag removal operation after the raw materials are completely dissolved into molten steel to ensure the cleanliness of the molten steel in the furnace; the raw materials include the following components in mass percentages: pouring system return material 82 %, waste castings 3%, scrap steel 8.37%, ferrotungsten 0.4%, low-carbon ferrochrome 5.3%, ferrosilicon 0.4%, recarburizer 0.09%, electrolytic manganese sheet 0.4%, sulfur powder 0.04%;

[0049] S2. Add sulfur powder of 0.01% by weight of molten...

Embodiment 2

[0054] A ferritic heat-resistant steel containing manganese, sulfur and tungsten, its chemical composition mass percentage is: C: 0.35%, Si: 1.79%, Mn: 1.11%, P: 0.018%, S: 0.040%, Cr: 19.3% , W: 1.90%, the balance is Fe and unavoidable impurities.

[0055] The preparation method of ferritic heat-resistant steel containing manganese, sulfur and tungsten comprises the following steps:

[0056] S1. Put the raw materials into the intermediate frequency induction furnace, and carry out the slag removal operation after the raw materials are completely dissolved into molten steel to ensure the cleanliness of the molten steel in the furnace; the raw materials include the following components in mass percentages: pouring system return material 80 %, waste castings 5%, steel scrap 8.6%, ferrotungsten 0.4%, low-carbon ferrochrome 5.2%, ferrosilicon 0.38%, recarburizer 0.08%, electrolytic manganese sheet 0.30%, sulfur powder 0.04%;

[0057] S2. Add sulfur powder of 0.01% by weight of mo...

Embodiment 3

[0062] A ferritic heat-resistant steel containing manganese, sulfur and tungsten, its chemical composition mass percentage is: C: 0.36%, Si: 1.78%, Mn: 1.48%, P: 0.020%, S: 0.030%, Cr: 19.4% , W: 1.80%, the balance is Fe and unavoidable impurities.

[0063] The preparation method of ferritic heat-resistant steel containing manganese, sulfur and tungsten comprises the following steps:

[0064] S1. Put the raw materials into the intermediate frequency induction furnace, and carry out the slag removal operation after the raw materials are completely dissolved into molten steel to ensure the cleanliness of the molten steel in the furnace; the raw materials include the following components in mass percentage: pouring system return material 81 %, waste castings 4%, steel scrap 8.475%, ferrotungsten 0.4%, low-carbon ferrochrome 5.2%, ferrosilicon 0.39%, recarburizer 0.08%, electrolytic manganese sheet 0.43%, sulfur powder 0.025%;

[0065] S2. Add sulfur powder of 0.01% by weight of ...

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Abstract

The invention discloses a ferritic heat-resistant steel containing manganese, sulfur and tungsten and a preparation method thereof. The chemical composition mass percentage of the heat-resistant steel is: C: 0.25%-0.5%, Si: 0.8%-2.5%, Mn : 1.0% to 1.50%, P: ≤0.04%, S: 0.030% to 0.050%, Cr: 18% to 21.5%, W: 1.8% to 2.5%, and the balance is Fe and unavoidable impurities. Its raw materials include pouring system return materials, waste castings, scrap steel, ferro-tungsten, low-carbon ferrochrome, ferrosilicon, recarburizer, electrolytic manganese flakes, and sulfur powder. In the preparation method of ferritic heat-resistant steel of the present invention, sulfur powder and electrolytic manganese flakes are added in two stages, which can improve the formation efficiency of spherical or nearly spherical MnS, increase the ratio of MnS, and reduce the ratio of solid solution manganese at the same time, Avoid work hardening caused by manganese while improving machinability. At the same time, the annealing is realized by using the cooling condition of the casting in the sand box, and the ferritic heat-resistant steel with high strength and good processing performance can be obtained without heat treatment process.

Description

technical field [0001] The invention relates to the technical field of ferritic heat-resistant steel, in particular to a ferritic heat-resistant steel containing Mn-S-W and a preparation method thereof, which are mainly used in the manufacture of automobile engine turbine casings and exhaust manifolds. Background technique [0002] Turbocharging technology (Turbo) is a technology that improves the fuel combustion efficiency by increasing the intake capacity of the engine, thereby increasing the power of the engine and reducing fuel consumption; be widely used. Heat-resistant steel is widely used in the manufacture of parts and structural parts such as automobile turbine shells and exhaust pipes, and its usage is increasing day by day. It is a typical representative of the materials required for automobile turbocharging technology and caters to the automotive industry's demand for heat-resistant materials that can withstand high temperatures. , corrosion resistance requireme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C21C7/00C21C7/06C22C33/04
CPCC22C38/02C22C38/04C22C38/22C22C33/04C21C7/0006C21C7/06Y02P10/20
Inventor 朱玉员
Owner WESCAST IND CHINA CO LTD