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Steel 17X18H9

Steel 17Cr18Ni9

Steel 17Cr18Hr9: 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 grade - Steel 17Cr18Ni.

General information about steel 17X18H9

Grade substitute
steel 20Х13Н4Г9.
Delivery type
Bar stock, including shaped: GOST 5949−75, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated rod GOST 7417−75, GOST 8559−75, GOST 8560−78. Grinded rod and silver GOST 14955−77, GOST 18907−73. Sheet thick GOST 7350−77. Thin sheet GOST 5582−75. GOST 4405−75 GOST 103−76 stripe. GOST 18143−72 wire. Forgings and forged blanks GOST 1133−71. Tubes GOST 9940−81, GOST 9941−81.
Application
Cold-rolled high-strength plates and strips for various parts and structures subjected to spot welding. Corrosion-resistant austenitic grade steel.

Chemical composition of steel 17Х18Н9

Chemical element %
Silicon (Si), not more 0.8
Manganese (Mn), not more than 2.0
Copper (Cu), not more than 0.30
Nickel (Ni) 8.0−10.0
Sulfur (S), not more than 0.020
Titanium (Ti), not more than 0.5
Carbon (C) 0.13−0.21
Phosphorus (P), not more than 0.035
Chrome (Cr) 17.0−19.0

Mechanical properties of steel 17Х18Н9

Heat treatment, delivery condition Section, mm σB, MPa δ5, % δ4, %
Rods. Hardened at 1050−1100°C, air, oil, water. 60 570 40  
Ground rods, machined to the specified strength 1−30 590−880 20  
Cored bars <5 930    
Pre-bent bars >5 880    
Hot- or cold-rolled sheets. Hardened at 1080−1120°C, water >4 588 35  
Hot- or cold-rolled sheets. Hardened 1050−1100°C, water or air >4 590 35  
Plate hardened <3,9 980−1220 13  
Plate, semi-blasted <3,9 730−980 18  
Cold rolled strip. Hardened 1050−1080°C, water or air <0,2 580   17
Cold rolled strip. Hardened 1050−1080°C, water or air 0,2−2,0 580   24
Semi-naked cold-rolled steel strip <0,2 800   8
Cold rolled flat rolled steel strip 0,2−2,0 800   15
Cold rolled flat rolled steel tape <0,2 1000   3
Cold-rolled flat steel tape 0,2−2,0 1000   5
Cold-rolled high-temperature rolled steel strip <0,2 1150   2
Cold-rolled high-hardened steel strip 0,2−2,0 1150   3
Heat-treated wire 0,2−1,0 590−880 20  
Bulk wire 0,2−1,0 1080    
Seamless hot-deformed pipes without heat treatment 3,5−32 568 40  
Heat-treated cold- and heat-treated seamless hot-deformed pipes 0,2−22 568 35  

Mechanical properties at elevated temperatures

t test,°C σ0, 2, MPa σB, MPa δ5, % ψ, %
Tempering at 1100 °C.
20 380 830 45 51
600 350 560 33 55
700 210 410 33 52
800 190 255 34 64
900   150 45 81
1000   47 53 86

Mechanical properties depending on the degree of plastic deformation

Heat treatment, delivery condition σ0, 2, MPa σB, MPa δ5, %
Degree of deformation - 0% 500 830 67
Deformation rate - 10% 750 950 45
Degree of deformation - 20% 900 1050 38
Degree of deformation - 30% 1030 1150 25
Degree of deformation - 40% 1140 1230 21
Level of deformation - 50% 1220 1300 18
Degree of deformation - 60% 1280 1350 17
Degree of deformation - 70% 1350 1400 12

Technological properties of steel 17Х18Н9

Forging temperature
Beginning temperature 1200, ending temperature 850. Sections up to 350 mm are cooled in air.

Impact toughness of steel 17X18H9

Impact strength, KCU, J/cm2

Delivery condition, heat treatment +20 -40 -80
The rod with a cross section of 25 mm. Hardened 1100 C, water. 294   294
Bar cross section of 20 mm. Hardened at 1150 C, water. 349 387 362
Bar cross section of 22 mm. 1150 C, water hardened. b0,2 = 260 MPa, bv = 710 MPa. 304 267 245

Corrosion properties of steel 17X18H9

Medium Test temperature,°C Depth, mm/year
0.5−99% HNO4 solution 20 0,1

Physical properties of steel 17Х18Н9

Test temperature,°C 20 100 200 300 400 500 600 700 800 900
Modulus of normal elasticity, E, GPa 199             147    
Steel density, pn, kg/m3 7850                  
Thermal conductivity coefficient W/(m - °C) 18 19 20 21 22 24 25 26 27 28
Electrical resistivity (p, nominal value - m) 720 735 855 925 975 1031 1080 1115 1150 1185
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) 16.0 17.0 17.5 17.9 18.5 18.6 18.9 19.1 19.3 19.5
Specific heat capacity (C, J/(kg -°C)) 504