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Preparation method of austenitic heat-resistant steel with high durable strength and steam corrosion resistance

A technology for austenitic heat-resistant steel and lasting strength, applied in the field of austenitic heat-resistant steel preparation, can solve problems such as inapplicability, improve oxygen supply strength, reduce burning loss and slag, and reduce chromium burning. damage effect

Active Publication Date: 2018-05-22
YONGXING SPECIAL STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This steel still has good impact toughness after long-term high-temperature aging, and can be used as a pipe material for superheaters / reheaters of 600°C ultra-supercritical boilers; but at 35MPa (32-38MPa), 650°C (630 -670℃) or higher-level high-efficiency ultra-supercritical units are not applicable

Method used

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  • Preparation method of austenitic heat-resistant steel with high durable strength and steam corrosion resistance
  • Preparation method of austenitic heat-resistant steel with high durable strength and steam corrosion resistance

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this embodiment, the chemical composition of the austenitic heat-resistant steel is as follows:

[0033] Cr 21wt%, Ni 10wt%, Cu 2.5wt%, N 0.18wt%, C 0.04wt%, Nb 0.20wt%, V0.10wt%, Mo 0.15wt%, Si 0.6wt%, Mn 0.8wt%, S< 0.01wt%, P<0.025wt%, B0.003wt%, Bi<0.015wt%, As<0.015wt%, Pb<0.015wt%, Sn<0.015wt%, Sb<0.015wt%, the balance is Fe; And the sum of the five elements of Bi, As, Pb, Sn, and Sb is <0.05wt%.

[0034] In this embodiment, the preparation method of austenitic heat-resistant steel is as follows:

[0035] (1) Ingredients: Prepare raw materials according to the chemical composition and burning loss of austenitic heat-resistant steel, send the raw materials into the electric arc furnace to melt into molten steel, add 25kg / t of slagging agent lime for initial smelting in the electric furnace, and reduce with the reducing agent For oxidized metals in molten steel, adjust the Cr content in molten steel to be 0.30% higher than the lower limit of the target value spe...

Embodiment 2

[0044] In this embodiment, the chemical composition of the austenitic heat-resistant steel is as follows:

[0045] Cr 23wt%, Ni 15.5wt%, Cu 3.6wt%, N 0.25wt%, C 0.07wt%, Nb 0.50wt%, V0.12wt%, Mo 0.15wt%, Si 0.3wt%, Mn 0.6wt%, S <0.005wt%, P<0.025wt%, B0.002wt%, Bi<0.015wt%, As<0.015wt%, Pb<0.015wt%, Sn<0.015wt%, Sb<0.015wt%, the balance is Fe .

[0046] In this embodiment, the preparation method of austenitic heat-resistant steel is as follows:

[0047] (1) Ingredients: prepare raw materials according to the chemical composition and burning loss of austenitic heat-resistant steel, send the raw materials into the electric arc furnace to melt into molten steel, add 27kg / t of slagging agent lime for the initial refining of the electric furnace, and reduce with the reducing agent For oxidized metals in molten steel, adjust the Cr content in molten steel to be 0.30% higher than the lower limit of the target value specified for the type of steel being made; when the temperature of...

Embodiment 3

[0056] Cr 22.5wt%, Ni 15wt%, Cu 3.5wt%, N 0.25wt%, C 0.07wt%, Nb 0.45wt%, V0.20wt%, Mo 0.35wt%, Si 0.3wt%, Mn 0.7wt%, S <0.005wt%, P<0.025wt%, B0.003wt%, Bi<0.015wt%, As<0.015wt%, Pb<0.015wt%, Sn<0.015wt%, Sb<0.015wt%, the balance is Fe .

[0057] In this embodiment, the preparation method of austenitic heat-resistant steel is as follows:

[0058] (1) Ingredients: prepare raw materials according to the chemical composition and burning loss of austenitic heat-resistant steel, send the raw materials into the electric arc furnace to melt into molten steel, add 28kg / t of slagging agent lime for the initial smelting of the electric furnace, and reduce with the reducing agent For oxidized metals in molten steel, adjust the Cr content in molten steel to be 0.30% higher than the lower limit of the target value specified for the type of steel being made; when the temperature of molten steel reaches 1630°C, the molten steel is released from the furnace;

[0059] (2) Oxygen blowing dec...

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Abstract

The invention relates to a preparation method of high-endurance-strength steam-corrosion-resistance austenitic heat-resistance steel, and belongs to the technical field of austenitic heat-resistance steel. The method sequentially comprises the technological steps of ingredient preparation, decarburization by oxygen blowing, reduction, steel tapping, ladle refining, casting, cogging and hot rolling. Compared with 22 / 15 austenitic heat-resistance steel, the SP22 / 15 has the similar nickel content and chrome content, however has the better high temperature endurance strength and high temperature steam corrosion resistance, and therefore the steel has the better market prospect compared with 22 / 15 austenitic heat-resistance steel. The steel can completely replace 22 / 15 austenitic heat-resistance steel, and can adapt to severe conditions to which 22 / 15 austenitic heat-resistance steel cannot adapt, for example, the steel can normally work at the high temperature and high pressure steam environment under 650DEG C and 35 MPa, and keep good impact toughness.

Description

technical field [0001] The invention relates to a preparation method of austenitic heat-resistant steel, in particular to a preparation method of austenitic heat-resistant steel with high durable strength and steam corrosion resistance. Background technique [0002] In order to improve the conversion efficiency of coal combustion, the construction of high-heat-resistant systems has become an important breakthrough, especially in the research of high-temperature materials for 600°C ultra-supercritical boilers. In December 2006, my country's first 600°C ultra-supercritical coal-fired generating set was put into operation, and all indicators have reached international advanced standards. Since then, my country has vigorously developed 600°C ultra-supercritical units, and more than 100 units have been put into operation so far, occupying an absolute advantage in the total number of ultra-supercritical coal-fired generating units in the world. [0003] At present, high-pressure ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/54C22C38/42C22C38/48C22C38/44C22C38/46C22C38/02C22C38/04C22C38/60C21C5/52C21C7/068
CPCC21C5/5264C21C7/068C22C38/001C22C38/002C22C38/008C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48C22C38/54C22C38/60Y02P10/20
Inventor 杨辉陈根保吉建军王建勇
Owner YONGXING SPECIAL STAINLESS STEEL
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