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Cr-Ni system austenitic heat-resistant steel with endogenous precipitation reinforcing phase and preparation method thereof

A technology of austenitic heat-resistant steel and reinforcing phase, which is applied in the field of metallurgy and can solve the problems of increased cost of Cr-Ni austenitic heat-resistant steel and high price of Ni resources

Active Publication Date: 2020-12-08
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, these Cr-Ni series austenitic heat-resistant steels provide their mechanical properties and high-temperature oxidation resistance by increasing the content of Ni and Cr. However, the price of Ni resources is relatively high, and this method will lead to Cr-Ni system Increased cost of austenitic heat-resistant steel

Method used

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  • Cr-Ni system austenitic heat-resistant steel with endogenous precipitation reinforcing phase and preparation method thereof
  • Cr-Ni system austenitic heat-resistant steel with endogenous precipitation reinforcing phase and preparation method thereof
  • Cr-Ni system austenitic heat-resistant steel with endogenous precipitation reinforcing phase and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] This embodiment provides a Cr-Ni austenitic heat-resistant steel with endogenous precipitation of reinforcing phases, the chemical composition of which includes C: 0.3%, B: 0.4%, Ti: 1.8%, Cr: 15% by weight. %, Ni: 10%, Mo: 0.2%, Si: 0.2%, S≤0.03%, P≤0.03%, and the rest are Fe and unavoidable impurity elements.

[0063] The Cr-Ni austenitic heat-resistant steel with endogenous precipitation of strengthening phase simultaneously generates TiB 2 Reinforcement particles and TiC reinforcement particles, TiB 2 The volume fractions of reinforcement particles and TiC reinforcement particles are 2.1% and 3.0%, respectively. TiB 2 The particle sizes of the particles and TiC particles were 5.8 and 4.7 microns, respectively.

[0064] The Cr-Ni system austenitic heat-resistant steel with endogenous precipitation reinforcement phase is obtained in this way:

[0065] Set the ratio of the total mass of steel, ferrosilicon, pig iron, nickel, and ferrochrome to the total mass of rei...

Embodiment 2

[0076] This embodiment provides a Cr-Ni austenitic heat-resistant steel with endogenous precipitation of reinforcing phases, the chemical composition of which includes C: 0.9%, B: 1.3%, Ti: 6.1%, Cr: 25% by weight. %, Ni: 20%, Mo: 2%, Si: 1.0%, S≤0.03%, P≤0.03%, and the rest are Fe and unavoidable impurity elements.

[0077] The Cr-Ni austenitic heat-resistant steel with endogenous precipitation of strengthening phase simultaneously generates TiB 2 Reinforcement particles and TiC reinforcement particles, TiB 2 The volume fractions of reinforcement particles and TiC reinforcement particles are 8.5% and 7.4%, respectively. TiB 2 The particle sizes of the particles and TiC particles were 8.8 and 10.7 microns, respectively.

[0078] The preparation steps of the heat-resistant steel are the same as those in Example 1, except that the ratio of the total mass of steel, ferrosilicon, pig iron, ferronickel, and ferrochrome to the total mass of reinforcement raw materials is 100:8.2....

Embodiment 3

[0080] This embodiment provides a Cr-Ni austenitic heat-resistant steel with endogenous precipitation of reinforcing phases, the chemical composition of which includes C: 0.2%, B: 0.5%, Ti: 2.0%, Cr: 17% by weight. %, Ni: 11%, Mo: 0.2%, Si: 0.4%, S≤0.03%, P≤0.03%, and the rest are Fe and unavoidable impurity elements.

[0081] The Cr-Ni austenitic heat-resistant steel with endogenous precipitation of strengthening phase simultaneously generates TiB 2 Reinforcement particles and TiC reinforcement particles, TiB 2 The volume fractions of reinforcement particles and TiC reinforcement particles are 2.1% and 1.7%, respectively. TiB 2 The particle sizes of the particles and TiC particles were 4.5 and 5.1 microns, respectively.

[0082] The preparation steps of the heat-resistant steel are the same as those in Example 1, except that the ratio of the total mass of steel, ferrosilicon, pig iron, ferronickel, and ferrochrome to the total mass of the reinforcement material is 100:2.0....

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Abstract

The present application relates to the field of metallurgy technology, in particular, to a Cr-Ni austenitic heat-resistant steel with endogenously precipitated reinforcing phase and a preparation method thereof. Using TiC and / or TiB 2 The particle-reinforced Cr-Ni austenitic heat-resistant steel has a metal and ceramic two-phase structure, which can improve the mechanical properties of the heat-resistant steel. At the same time, since TiC and / or TiB 2 The "reactive particle effect" brought about greatly improves the high temperature oxidation resistance of heat-resistant steel. In the heat-resistant steel, the volume fraction of the endogenous precipitated reinforcing phase is 1.2-15.9%, which can ensure the uniform dispersion and distribution of ceramic particles in the Cr-Ni series austenitic heat-resistant steel matrix, so that at a lower Cr content Under the premise, the high temperature oxidation resistance of Cr-Ni austenitic heat-resistant steel is greatly improved.

Description

technical field [0001] The present application relates to the technical field of metallurgy, in particular, to a Cr-Ni austenitic heat-resistant steel with endogenously precipitated reinforcing phase and a preparation method thereof. Background technique [0002] Austenitic heat-resistant steel is widely used in metallurgy, mining, petrochemical, electric power and other industrial fields to prepare heat-resistant structural components. Among them, Cr-Ni austenitic heat-resistant steel is the most widely used and most diverse heat-resistant steel series. [0003] Cr-Ni austenitic heat-resistant steel has good mechanical properties and high temperature oxidation resistance. For example, Cr18Ni9, Cr18Ni11Ti, and Cr18Ni11Nb can be applied to boiler tubes at 600-650 °C and various plate and tube materials at around 850 °C; Cr23Ni13 can be used for furnace heat-resistant components at 1000 °C; Cr21Ni35AlTi (Incoloy800) can be used at higher temperatures The petrochemical and nu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C21C7/06C22C38/02C22C38/44C22C38/50C22C38/54C21D1/00C21D6/00
CPCC21C7/0006C21C7/06C21D1/00C21D6/004C21D6/008C22C33/06C22C38/002C22C38/02C22C38/44C22C38/50C22C38/54
Inventor 骆智超刘天龙王娟郑开宏
Owner GUANGDONG INST OF NEW MATERIALS
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