SU1454878A1 - Heat-resistant steel - Google Patents

Abstract

The invention relates to metallurgy, in particular to heat-resistant steel, and can be used in the manufacture of castings operating under conditions of high temperatures, heat exchangers and corrosive media. The purpose of the image, reteni - improving mechanical properties, heat resistance and wear-resistant steel. Steel additionally contains aluminum and boron in the following ratio of components, wt.%: Carbon 0.2-0.6; silicon 0.6-2.5; manganese 0.2-1.5; chromium 20-30; nickel 20-30; titanium 0.05-0.50; aluminum-: NII 0.03-1.00; calcium 0.05-0.50; boron 0.001-0.01; iron else. The use of steel will improve the reliability and durability of parts. 2 tab. W (L

Description

one

The invention relates to metallurgy, in particular to heat-resistant steel, and can be used in the manufacture of castings operating under conditions of high temperatures, heat exchangers and corrosive media.

The purpose of the invention is to improve the mechanical properties, heat resistance and wear resistance.

PRI me R. In sand-clay molds were cast steel samples with a diameter of 40 mm and a height of 200 mm. Samples were cut out of these samples to determine the chemical composition of the steel, the mechanical properties, the heat resistance and the wear resistance.

Chemical compositions of known and proposed steel are given in table. one.

The tensile strength and elongation were determined in the tensile test for specimens with a diameter of 5 mm (type Ш № 7) on the FP-100 test machine 5.

Hardness was determined on samples with a thickness of 15 mm, cut from the middle part of the samples, on a TSH-2 hardness tester with a 5 mm diameter gary with a load of 750 kgf.

Heat resistance was determined from the weight loss of cylindrical specimens at 1200 ° C for 100 hours.

 5 Wear resistance tests were carried out in a laboratory setup with a special rotor with a rotation speed of 5000 rpm at an abrasive flow rate of 28 m / g. Refer 10

four

00

00

Total wear resistance is defined as the ratio of the weight loss of a sample from a known steel to a sample from a steel under study.

The results of the tests are given

in tab. 2,

Application of the proposed steel before

It is assumed in the manufacture of parts operating at high temperatures in corrosive environments, in particular, grate roasting and sintering machines, and will increase the reliability and durability of parts.

Formula inventions

Heat resistant steel containing carbon, silicon, manganese, chromium.

, - 7.

Nickel, titanium, calcium, and the same, pezo, characterized in that, in order to improve the mechanical properties, heat resistance and wear resistance, it additionally contains aluminum and boron in the following ratio

0.2 - 0.6

0.6 - 2.5

0.2 .- 1.5

20 - 30

20 - 30

0.05 - 0.50

0.05 - 0.50

0.03 - 1.00

0.001 - 0.010

Rest

Table D

Claims (1)

Claim Heat-resistant steel containing carbon, silicon, manganese, chromium, nickel, titanium, calcium, iron, characterized in that, in order to improve mechanical properties, heat resistance and wear resistance, it additionally contains aluminum and boron in the following ratio of components, wt.%: Carbon 0.2 - 0.6 Silicon 0.6 - 2,5 Manganese 0.2 1,5 Chromium 20 - thirty Nickel 20 - thirty Titanium 0.05 - 0.50 Calcium 0.05 - 0.50 Aluminum 0,03 - 1.00 Boron 0.001 - 0,0I Iron Rest Table 1 Steel Content Elements, May. 2 Carbon Silicon Manganese Chromium Nickel Titanium Aluminum Calcium Boron Iron Famous 1 0.4 ",about 0.95 25 19.5 0.35 - 0.25 Rest Proposed 2 0.20 0.60 0.20 20,0 20,0 0.05 0,03 0.05 0.001. 3 0.40 1.55 0.80 25 25.0 0.25 0.50 0.28 0.005 4 0.60 2,50 1,50 thirty 30,0 0.50 1.00 0.50 0.01 table 2 Steel Relative ! .Tver- Loss Relative Limit Limit durable- fluid body ; ACHIEVEMENT, masses body at ty, MPa elongated j HB at wear and tear stretch % I 1200% durability research institutes, MPa 1 g / m ¹ h 1 500-515 510 220-230 ““ 225 ““ 20-21 _d 5 ““ ~ 2Ϊ: “ 143 <\ 57 _Σ 0 _Λ 59 0.58 100 2 535-545 540 240-250 245 23-27 “25“ “ 148 О _а 51-О _d 53 “б? 52“ “ 1,04 3 559-571 565 ” 247-250 ““ 248 “ 29-31 zo 160 0 _x 45-0 _a 49 0.47 1.15 4 600-607 ““ BO5 ~ “ 255-260 “~ 25b“ 31-36 34 ““ 197 Ο _Λ 46-Ο _Χ 5Ο ““ 0? 48 1.25  SHMG-VG- · - · , - _Ύι - _Τ ____________ -.-.--about-" Note. The numerator is the limits of change, the denominator is the average value.