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Chrome-manganese nitrogen series austenitic heat-resistance steel and preparation method thereof

An austenitic heat-resistant steel, chromium-manganese-nitrogen-based technology, applied in the field of automotive steel, can solve the problems of inability to meet the requirements of high-performance engines, high thermal expansion coefficient, and reduced high temperature strength, and achieve improved durability and creep performance. , the effect of high thermal conductivity and low production cost

Inactive Publication Date: 2016-12-21
TIANJIN NEW WEISAN INDS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the materials used to manufacture turbocharger housings and exhaust manifolds are mainly high-silicon-molybdenum ductile iron and high-nickel ductile iron (see CN103898398A and CN103898397A). It works normally at high temperature. When working above 1000℃, there are problems such as low thermal conductivity, high temperature strength drop, high thermal expansion coefficient, etc., and due to the addition of a large amount of nickel element, there is a disadvantage of high cost. Therefore, it can no longer meet the requirements of high-performance engines.

Method used

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  • Chrome-manganese nitrogen series austenitic heat-resistance steel and preparation method thereof
  • Chrome-manganese nitrogen series austenitic heat-resistance steel and preparation method thereof

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preparation example Construction

[0021] The present invention also provides a method for preparing the chromium-manganese-nitrogen austenitic heat-resistant steel described in the above technical solution, comprising the following steps:

[0022] (1) Melting the alloy raw materials of each element component to obtain a feed liquid;

[0023] (2) Put the feed liquid obtained in the step (1) to rest and then pour into molding to obtain chromium-manganese-nitrogen austenitic heat-resistant steel.

[0024] In the present invention, the sources of the alloy raw materials of each element component are not particularly limited, and commercially available alloy raw materials well known to those skilled in the art can be used; in the embodiments of the present invention, the alloy raw materials of each element component Ferro-silicon, manganese, micro-carbon ferrochrome, ferro-niobium, ferro-tungsten, ferro-vanadium, nickel plate, ferrochromium nitride alloy, metal zirconium, metal yttrium, metal cobalt, boron iron, ni...

Embodiment 1

[0036]1. Ingredients: The weight percentage distribution of main raw materials: recarburizer = 0.32%, scrap steel = 43.39%, chromium nitride = 8.58%, micro-carbon ferrochromium = 34.31%, electrolytic manganese = 5.15%, ferrosilicon = 1.25 %, nickel plate = 7.0%.

[0037] 2. Melting: The smelting equipment adopts medium-frequency induction furnace, and the capacity of the induction furnace ranges from 0.5 tons to 3 tons. Put the above-mentioned prepared raw materials into the intermediate frequency induction furnace in sequence, and then send electricity to raise the temperature; when the input materials are completely melted, continue to raise the temperature in the intermediate frequency induction furnace to 1580°C, and take the spectroscopic analysis test piece for the intermediate frequency induction furnace. The material liquid in the electric furnace is spectroscopically analyzed, and the analysis results are shown in the following table:

[0038] element

C ...

Embodiment 2

[0044] 1. Ingredients: weight percentage distribution of main raw materials: recarburizer = 0.35%, scrap steel = 43.29%, chromium nitride = 8.65%, micro-carbon ferrochrome = 33.71%, electrolytic manganese = 5.35%, ferrosilicon = 1.55 %, nickel plate = 7.1%.

[0045] 2. Melting: The smelting equipment adopts medium-frequency induction furnace, and the capacity of the induction furnace ranges from 0.5 tons to 3 tons. Put the above-mentioned prepared raw materials into the intermediate frequency induction furnace in sequence, and then send electricity to raise the temperature; when the input materials are completely melted, continue to raise the temperature in the intermediate frequency induction furnace to about 1600°C, and take the spectroscopic analysis test piece for the intermediate frequency The material liquid in the induction furnace is spectroscopically analyzed, and the analysis results are shown in the table below:

[0046] element

C

Si

mn

P

...

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Abstract

The invention provides chrome-manganese nitrogen series austenitic heat-resistance steel, and belongs to the technical field of automotive steel. The chrome-manganese nitrogen series austenitic heat-resistance steel comprises 0.20%-0.50% of carbon, 0.50%-2.00% of silicon, 2.00%-5.00% of manganese, 0-0.04% of phosphorus, 0-0.03% of sulfur, 20.00%-27.00% of chromium, 6.00%-8.00% of nickel, 0-0.50% of molybdenum, 0-0.60% of niobium, 0-0.60% of tungsten, 0-0.15% of vanadium, 0.30%-0.60% of nitrogen, 0-0.10% of zirconium, 0-0.10% of cobalt, 0-0.10% of yttrium, 0-0.20% of boron and the balance Fe. The heat-resistance steel disclosed by the invention has the high-temperature strength, high heat conduction coefficient and low thermal expansion coefficient; moreover, the dimension is stable, ductility is good, heat resistance and impact resistance are achieved, production cost is low, and the operating requirement of a high-performance engine can be met.

Description

technical field [0001] The invention relates to the technical field of steel for vehicles, in particular to a chromium-manganese-nitrogen-based austenitic heat-resistant steel and a preparation method thereof. Background technique [0002] With the development of the automobile industry towards high performance and light weight, the increase in the speed of the automobile engine will lead to an increase in the temperature of the exhaust gas, and the maximum operating temperature of the exhaust manifold and turbocharger connected to the automobile engine will rise to 1050°C , or even higher temperature, which requires that the materials used for automobile turbine casings and exhaust pipes not only have sufficient high-temperature strength and heat resistance, but also have good dimensional stability and high It has good ductility and good thermal conductivity. [0003] At present, the materials used to manufacture turbocharger housings and exhaust manifolds are mainly high-...

Claims

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Application Information

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IPC IPC(8): C22C38/44C22C38/48C22C38/58C22C38/46C22C38/50C22C38/52
CPCC22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/58C21C7/0075C21C7/0087C22C38/001C22C38/002C22C38/005C22C38/02C22C38/54B22D43/005C22C38/40
Inventor 陈友三陈常彬林政德郭志雄米歇尔·米勒谢成兴王金辉温学文谭明明宗林涛田恒霖
Owner TIANJIN NEW WEISAN INDS
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