SU1608239A1 - Refractory steel - Google Patents

Abstract

The invention relates to the field of ferrous metallurgy, in particular to heat-resistant steel, and is intended for use in power engineering. The purpose of the invention is to increase the plastic properties after aging at 500-1300 ° C, operational durability while maintaining heat resistance at temperatures up to 1300 ° C. Steel additionally contains copper in the following ratio of components, wt.%: Carbon 0.005-0.03, chromium 22.0-23.9, nickel 25.0-27.0, aluminum 4.3-4.8, titanium 0, 1-0.4, cerium 0.01-0.05, copper 0.4-0.6, iron - the rest when performing the ratio% NIX10 ^-1 /% CRX10 ^-1 +% AL = 0.35 - 0.40 . 1 TABLE

Description

0.35 - 0.40, i table.

The invention relates to ferrous metallurgy, in particular to heat-resistant steel, and is intended for use in power plant engineering.

The aim of the invention is to increase the plastic properties after aging at temperatures of 500-1 ° C and operational resistance while maintaining heat resistance at temperatures up to 1300 ° C.

Doping with chromium, aluminum, and nickel in the proposed amounts for the implementation of this ratio leads to a limitation of the ferrite content and provides for an increase in high-temperature plasticity while maintaining high heat resistance up to 1300 ° C.

The table shows the compositions of the proposed and known steels and their properties.

The ferrite content was determined by a magnetometric method according to a procedure specially developed for these steels {.

The plastic properties (§, ({) at 500–1300 ° C were determined on razryny samples.

Testing for heat resistance was carried out at 1300 s on the basis of 2000 h with

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using a silicon muffle furnace. L (the resistance of steels was estimated from the sample oxidation rate calculated from the mass loss after removal of corrosion products.

The operational resistance was studied on full-scale samples — elements of the furnace boiler equipment. The resistance of the samples was evaluated by the operating time of the equipment and the state of the sample that was tested under production conditions of the TPP,

It follows from the table that the steel of the proposed composition has a higher ductility along with maintaining heat resistance at 1300 s, which ensures a high operational durability of the material compared to the known steel.

Claims (1)

Invention Formula Heat resistant steel containing carbon, chromium, nickel, aluminum, titanium. Nepe herd 0.025 25.5 24.5 5.3 0.34 0.03 Pre-0.005 22.0 25.0 4.3 0.10 0.01 0.4 0.300.41 lag0, 03 h3, 9 2.0 4.8 0, “0 0.05 0.6 0.68 0,017 22,9 26,0 4,6 0,27 0,03 0,5 0,29 0,012 23,2 26,3 4,3 0,26 0,04 0,55 0,31 0.013 23.5 5.0 4.8 0.2 0.05 0.45 0.290.25 cerium, iron, excellent - so that, in order to improve plastic properties after aging at temperatures of 500-1300 s, operational durability while maintaining heat resistance at temperatures up to 1300 ° C, it additionally contains copper in the following ratio of components, wt.%: th 0.005-0.03 22.0-23.9 25-27 4.3-4.8 0.1-0.4 0.01-0.05 0.4-0.6 Else when executing the ratio NgGT5 -HP- 0.35-0.40. 0,280.31 0.30 thirty 0.37 3.0 0.40 0.37 8,8 0.38, 0.40 8.0 3.2 0.35 9.in HsB Steam g, 9 2.7 10.0 8, t 7.0 5.1 6.2 6.4 0.0085 Pred-1 (1.8 15.3 28.7 30.4 30.6 29.1 31.2 31.7 0.0092 Aga10, 9 12.3 28.3 29.6 29.8 30.5 29, 1 29.8 0.0 (8G. 11.9 14.2 28.2 30.0 30.8 29.9 30.0 31.2 0.0089 11.0 14.6 26.5 27.1 31.0 30.4 28.9 29, 6 0,0090 9.9 11.2 23.1 24.3 26.7 28.0 27.3 28.4 0.0082 Hel13 - the rest. Continuation of tzbli1ts 1 According to the inclusions of trials at high brittle metal, lefprmein walls, a sample of tfitel in an unfavorable state 5000 hours (non-Offpaseu nvkhodils are satisfactory, in good condition) 5000 h (catch-- letvortepna) 5000 h - 5000 h (ud-os-ra-eets The Warden is good) NIN 5000 hours (satisfactory)