By visiting this site, you accept the use of cookies. More about our cookie policy.

Steel 20X23H18

X27YU5T CRN70VMTUF CHN78T CRN70VMYUT CHN80TBU CRN35VT CHN70U CRN35VTU CHN77TUR 20X23H18 31Х19Н9МВБТ 40Х13 20Х13 20X25H20C2 40Х15Н7Г7Ф2МС 10X23H18 12Х25Н16Г7АР 15X12VNMF 20Х20Н14С2 37X12H8G8MFB 40X9C2 20X23H13 30Х13 40CR10CR2M 45Х14Н14В2М 13Х11Н2В2МФ

20X23H18 steel

Steel 20X23H18: a classifier of steels and alloys. Below is systematized information on the purpose, chemical composition, types of supply, substitutes, critical point temperatures, physical, mechanical, technological and foundry properties for the brand — Steel 20X23H18.

General information about steel 20X23H18

Substitutes for the following steel grades
of steel grade: 20Х23Н13, 15Х25Т.
Delivery type
Sheet 20х23Н18, pipe 20х23Н18, a circle 20х23Н18, bars, including shaped: GOST 5949−75, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated bar GOST 7417−75, GOST 8559−75, GOST 8560−78. Grinded rod and silver GOST 14955−77. Thick plate GOST 7350−77, GOST 19903−74, GOST 19904−74. Tape GOST 4986−79. Stripe GOST 4405−75, GOST 103−76. Forged and forged blanks GOST 1133−71.
Application
Forgings, bandages for work at 650−700 ° C, parts of combustion chambers, clamps, hangers and other parts of the boiler mounts, muffles for work at temperatures up to 1100 ° C, seamless pipes. The steel is heat-resistant and heat-resistant of the outtense class.

Chemical composition of steel 20X23H18

Chemical element %
Silicon (Si), not more 1.0
Manganese (Mn), not more than 2.0
Copper (Cu), not more than 0.30
Nickel (Ni) 17.0−20.0
Sulfur (S), not more 0.02
Titanium (Ti), not more than 0.2
Carbon ©, not more than 0.20
Phosphorus (P), not more than 0.035
Chrome (Cr) 22.0−25.0

Mechanical properties of steel 20X23H18

Heat treatment, delivery condition Section, mm σ0.2, MPa σB, MPa δ5, % δ4, % ψ, %
Rods. Hardening 1100−1150°C, air or water. 60 196 490 35   50
Hot- or cold-rolled sheets. Hardened 1030−1130°C, water (transverse samples) >4 264 539 35    
Cold rolled tape. Hardened 1050−1080°C, water or air. <0,2   580   19  
Cold-rolled band. Hardened 1050−1080°C, water or air. 0,2−2,0   580   38  

Mechanical properties at elevated temperatures

t test,°C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
38−55 mm diameter bars. Hardened at 1180 °C with water. Aging at 800 °C, 4 h.
20 295−320 600−660 29−35 47−54 137−186
300 235 520−540 25−28 45−49 147−166
400 225 540 24−32 39−45 147−166
500 210 520−540 25−31 41−45 171
600 195 440 24 46 176
700 185−195 315−330 19−24 35 171
800 165 185−205 19−27 34 176
Specimen with diameter of 10 mm and length of 50 mm, rolled. The deformation rate is 20 mm/minute. Strain rate 0.007 1/s.
800 215 255 24 67  
900 135 135 37 77  
1000 64 71 49 77  
1100 39 44 51 70  
1200 22 27 27 31  

Mechanical properties as a function of heat soak and test temperature

Heat treatment, delivery condition t test temperature,°C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
38−55 mm cross-section bars. Hardened at 1180 °C with water. Aging at 800 °C, 4 h.
Heat soaking at 650 °C, 10,000 hours 20 330 590−630 12−18 28 64−69
Heat soak 650 °C, 10000 h 650 205 340−390 11−15 16−21 127
Heat soak 700 °C, 10000 h 20 320 510−550 5−6 8−10 15
Heat soak 700 °C, 10000 h 650 195 285−330 4−5 5−8 49
Heat soak 800 °C, 2000 h 20 295 640 26−35 29−42 59
Heat soak 800 °C, 2000 h 500 195 460 22 33−43  
Heat soak 800 °C, 2000 h 650 175 390 14−19 23−24 137−167
Heat soak 800 °C, 2000 h 800 145 185 6−8 12−16  
Heat soak 800 °C, 4000 h 20 315 590−630 17−32 20−39 34
Heat soak 800 °C, 4000 h 500 195 470 18−25 29−35 54−59
Heat soak 800 °C, 4000 h 650 185 350 8−12 15−17 78−98
Heat soak 800 °C, 4000 h 800 135 185 7−10 13−18  
Heat soak 800 °C, 10000 h 20 275 580−620 14−28 20−39 34
Heat soak 800 °C, 10000 h 650 175 340−370 5−10 20 73−80

Mechanical properties in the long term strength test

Creep strength, MPa Creep rate, %/h t test,°C ultimate strength, MPa Test duration, h t test, h
53 1/100000 650 113 10000 650
34 1/100000 700 59 10000 700
12 1/100000 800 78 100000 650
      34 100000 700

Technological properties of steel 20X23H18

Forging temperature
The beginning 1220, the end 900. Sections up to 350 mm are cooled in the air.
Weldability
limited weldability.
Machinability
In normalized and tempered state at HB 178 and σB = 610 MPa, K υ b.st. = 0.4.

Endurance limit of steel 20X23H18

σ-1, MPa σB, MPa σ0, 2, MPa Heat treatment, state of steel
255 590    
245 570 290 Tempering 1100 C, water or air. HB 140−200

Heat resistance of steel 20X23H18

Medium Temperature, °C Test duration, h Depth, mm/year Resistance group or grade
Air 650 4500 0,0027 2
Air 750 1500 0,01 3
Air 800   0,044 4

Physical properties of steel 20X23H18

Test temperature,°C 20 100 200 300 400 500 600 700 800 900
Modulus of normal elasticity, E, GPa 200     182 176 170 160 150 141  
Steel density, pn, kg/m3 7900       7760 7720 7670 7620   7540
Thermal conductivity coefficient W/(m — °C) 14 16   19   22        
Electrical resistivity (p, nominal value — m) 1000                  
Test temperature,°C 20−100 20−200 20−300 20−400 20−500 20−600 20−700 20−800 20−900 20−1000
Coefficient of linear expansion (a, 10−6 1/°C) 14.9 15.7 16.6 17.3 17.5 17.9 17.9      
Specific heat capacity (C, J/(kg -°C)) 538