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Cr-Ni austenitic heat-resistant steel with endogenous precipitated 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 high price of Ni resources and increased cost of Cr-Ni austenitic heat-resistant steel

Active Publication Date: 2020-04-03
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 austenitic heat-resistant steel with endogenous precipitated reinforcing phase and preparation method thereof
  • Cr-Ni austenitic heat-resistant steel with endogenous precipitated reinforcing phase and preparation method thereof
  • Cr-Ni austenitic heat-resistant steel with endogenous precipitated 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 invention relates to the technical field of metallurgy, in particular to Cr-Ni austenitic heat-resistant steel with an endogenous precipitated reinforced phase and a preparation method thereof. The Cr-Ni austenitic heat-resistant steel reinforced by TiC and / or TiB2 particles has a metal and ceramic two-phase structure, so that the mechanical property of the heat-resistant steel can be improved. Meanwhile, due to the reaction particle effect caused by TiC and / or TiB2, the high-temperature oxidation resistance of the heat-resistant steel is greatly improved. In the heat-resistant steel, thevolume fraction of the endogenous precipitated reinforcing phase is 1.2%-15.9%, uniform dispersion distribution of ceramic particles in a Cr-Ni austenitic heat-resistant steel matrix can be ensured, so that the high-temperature oxidation resistance of the Cr-Ni austenitic heat-resistant steel is greatly improved on the premise of lower Cr content.

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 Applications(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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