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Heat resistance stainless steel and smelting method thereof

A kind of technology of heat-resistant stainless steel, smelting method

Active Publication Date: 2008-01-09
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the existing smelting method designs the composition of ordinary OCr25Ni20, it only achieves the purpose of improving the high-temperature service performance of stainless steel by increasing the content of Cr and Ni, without considering the influence of N and rare earth elements on the final service performance
Since Ni is a precious metal, the price is high, so the existing heat-resistant stainless steel such as ordinary OCr25Ni20 has a relatively high smelting cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] The specific implementation of the heat-resistant stainless steel and the smelting method will be described in detail below in conjunction with the examples, but the specific implementation of the heat-resistant stainless steel and the smelting method are not limited to the following examples.

[0043] stainless steel embodiment

[0044] The composition (weight) of this heat-resistant stainless steel embodiment is as follows:

[0045] C 0.082% Si 1.75% Cr 20.69% Ni 10.65%

[0046] N 0.155% Mn 0.67% P 0.024% S 0.001%

[0047] Ce 0.048%, the rest is Fe and unavoidable impurities.

[0048] Example of smelting method

[0049] What this embodiment smelts is the heat-resistant stainless steel of above-mentioned embodiment, and present embodiment adopts AOD furnace, and the volume of this furnace is 45 tons, and the weight of molten steel before processing is 43.4 tons, and the temperature of molten steel is 1450 ℃, and the composition of molten steel (weight )as follows: ...

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Abstract

Heat resisting stainless steel and its smelting process are both disclosed herewith. It comprises (wt%): C 0.05-0.10, Si 1.40-2.00, Ce 0.03-0.08, Cr 20.0-22.0, Ni10.0-12.0, N 0.14-0.20, and Mn 0.4-0.80, with impurities of P not more than 0.040 and S 0.030. It is produced by: (1) pouring mother liquid of stainless steel with C (1.2-2.5) into AOD furnace, (2) decarbonizing to C (0.05-0.10), (3) reducing steel liquid and desulfurizing, (4) floss removing and regulating components of steel liquid, (5) pouring out and adding B-iron and Al cakes, (6) feeding Ce wires, (7) regulating temperature and controlling impurities, and (8) continuously casting. It costs low and has good performance at high temperature.

Description

technical field [0001] The invention relates to a heat-resistant stainless steel and a smelting method. Background technique [0002] Since heat-resistant stainless steel has good high-temperature oxidation resistance, high-temperature long-term use performance (ie, creep performance, durability) and structural stability at high temperature, it requires high alloy content, such as ordinary OCr25Ni20. When the existing smelting method designs the composition of ordinary OCr25Ni20, it only achieves the purpose of improving the high-temperature service performance of stainless steel by increasing the content of Cr and Ni, without considering the influence of N and rare earth elements on the final service performance. Since Ni is a precious metal with high price, the smelting cost of existing heat-resistant stainless steel such as common OCr25Ni20 is relatively high. Contents of the invention [0003] The aim of the present invention is to provide a low-cost heat-resistant st...

Claims

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Application Information

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IPC IPC(8): C22C38/40C22C33/04C21C7/00C21C7/068C21C7/064B22D11/18
Inventor 李国平范新智尹嵬刘明生王培智
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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