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Microalloying chromium-nickel austenitic heat-resistant steel, as well as preparation method and application thereof

An austenitic heat-resistant steel and micro-alloying technology, applied in the field of alloys, can solve problems such as hot cracks, poor casting performance, complex structure of exhaust pipe and turbine casing castings, etc.

Inactive Publication Date: 2017-07-07
TIANJIN DA SHIANG PRECISION IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the material GX40CrNiSi38-19 (1.4849) currently used to manufacture turbocharger housings and exhaust manifolds has high content of expensive Ni and Nb elements, resulting in high production costs; while GX40CrNiSi25-20 (1.4848) materials Although the content of Ni element is lower than that of GX40CrNiSi38-19 (1.4849), and the content of Nb is not required, but due to the complex structure and uneven wall thickness of the castings of the exhaust pipe and turbine casing, when casting production with GX40CrNiSi25-20 (1.4848), Hot cracks are prone to occur at the connection between the thick part and the thin-walled part, and the casting performance is poor

Method used

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  • Microalloying chromium-nickel austenitic heat-resistant steel, as well as preparation method and application thereof
  • Microalloying chromium-nickel austenitic heat-resistant steel, as well as preparation method and application thereof
  • Microalloying chromium-nickel austenitic heat-resistant steel, as well as preparation method and application thereof

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preparation example Construction

[0041] The present invention provides a method for preparing the microalloyed chromium-nickel series austenitic heat-resistant steel described in the above scheme, comprising the following steps:

[0042] The alloy raw material is smelted to obtain a feed liquid; the alloy raw material includes the following components in mass percentage: carbon 0.30%-0.60%, silicon 2.00%-3.00%, manganese≤1.00%, phosphorus≤0.04%, sulfur≤0.3% %, chromium 23.00%~28.00%, nickel 27.00%~30.00%, niobium 0.50%~1.50%, molybdenum ≤0.6%, nitrogen 0.20%~0.50%, vanadium 0.20%~0.50%, boron 0.01%~0.05%, rare earth Elements 0.005% ~ 0.100%, the balance of iron;

[0043] After the feed solution is left to stand, it is poured and formed to obtain a micro-alloyed chromium-nickel system austenitic heat-resistant steel.

[0044] The invention melts alloy raw materials to obtain feed liquid. In the present invention, the composition and content of the elements in the alloy raw material are consistent with the ab...

Embodiment 1

[0057] Ingredients: The weight percentage distribution of main raw materials is: recarburizer = 0.50%, scrap steel = 22.72%, chromium nitride (FeNCr10-A) = 4.20%, micro-carbon ferrochrome (ZKFeCr65C0.03) = 38.30%, niobium Iron (FeNb-60) = 1.40%, ferrosilicon (FeSi75-B) = 3.25%, nickel plate (99.9% high-purity nickel plate) = 29.00%, vanadium iron (FeV50-A) = 0.45%, boron iron (FeB23C0. 05) = 0.11%, dense cerium alloy = 0.025%;

[0058] Melting: The smelting equipment adopts a medium-frequency induction furnace. Firstly, steel scrap, nickel plate, ferro-vanadium, ferro-boron, and recarburizer are put into the medium-frequency induction furnace, and the temperature is raised to 1580°C by power transmission. After the material is melted, the remaining material is added to the furnace and continued Heat preservation smelting, control the total smelting time to 2 hours; when the input materials are completely melted, raise the temperature in the intermediate frequency induction fur...

Embodiment 2

[0071] Ingredients: The weight percentage distribution of main raw materials is: recarburizer = 0.48%, scrap steel = 21.782%, chromium nitride (FeNCr10-A) = 4.63%, micro-carbon ferrochromium (ZKFeCr65C0.03) = 37.55%, niobium Iron (FeNb-60) = 2.71%, ferrosilicon (FeSi75-B) = 2.93%, nickel plate (99.9% high-purity nickel plate) = 29.00%, vanadium iron (FeV50-A) = 0.80%, boron iron (FeB23C0. 05) = 0.10%, dense cerium alloy = 0.018%;

[0072] Melting: The smelting equipment adopts a medium-frequency induction furnace. Firstly, steel scrap, nickel plate, ferro-vanadium, ferro-boron, and recarburizer are put into the medium-frequency induction furnace, and the temperature is raised to 1620°C by power transmission. After the materials are melted, the remaining materials are added to the furnace and continue Heat preservation smelting, control the total smelting time to 2 hours; when the input materials are completely melted, continue to raise the temperature in the intermediate frequ...

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Abstract

The invention provides microalloying chromium-nickel austenitic heat-resistant steel. The microalloying chromium-nickel austenitic heat-resistant steel comprises the following components in percentage by mass: 0.30-0.60% of carbon, 2.00-3.00% of silicon, not more than 1.00% of manganese, not more than 0.04% of phosphorus, not more than 0.3% of sulfur, 23.00-28.00% of chromium, 27.00-30.00% of nickel, 0.50-1.50% of niobium, not more than 0.6% of molybdenum, 0.20-0.50% of nitrogen, 0.20-0.50% of vanadium, 0.01-0.05% of boron, 0.005-0.100% of rare-earth elements, and the balance iron. The microalloying chromium-nickel austenitic heat-resistant steel provided by the invention is high in strength, good in heat resistance and low in cost, has high capacity for resisting the tendency of generating hot cracks in the solidifying process of a casting, can be widely applied in the casting of a turbine case and an exhaust pipe of an automobile, and meets requirements for high-performance engines.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to a microalloyed chromium-nickel series austenitic heat-resistant steel and its preparation method and application. Background technique [0002] In recent years, as environmental protection requirements have become more and more stringent, the requirements for automobile exhaust emissions have also become higher and higher, and the fuel efficiency and exhaust temperature of automobiles have increased accordingly. The maximum operating temperature of the exhaust manifold and turbocharger connected to the car engine will rise to 1050°C or even higher. The materials of automobile turbine casing and exhaust pipe must not only have sufficient high-temperature strength and heat resistance, but also require good dimensional stability and high ductility under high temperature conditions, as well as good thermal conductivity. In order to meet the use requirements of exhaust pipes and turbo...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02C22C38/34C22C38/04C22C38/48C22C38/44C22C38/46C22C38/54C22C33/04
CPCC22C38/34C22C1/02C22C30/00C22C33/04C22C38/001C22C38/005C22C38/04C22C38/44C22C38/46C22C38/48C22C38/54
Inventor 陈友三陈常彬林政德郭志雄谢成兴温学文
Owner TIANJIN DA SHIANG PRECISION IND CO LTD
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