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Steel 12X17

12Cr17 steel

Steel 12X17: Handbook 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 12X17.

General information about steel 12X17

Grade substitute
steel 12Х18Н9Т.
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. Sheet thick GOST 7350−77. Sheet GOST 5582−75 thin. GOST 4405−75, GOST 103−76. Forgings and forged blanks GOST 5949−75, GOST 1133−71. Tubes GOST 9940−81, GOST 9941−81.
Application
Fasteners, rollers, sleeves and other parts of the apparatus and vessels working in dilute solutions of nitric, acetic, citric acid, in salt solutions with oxidizing properties. Steel is corrosion-resistant and heat-resistant up to 850 °C of ferritic class.

Chemical composition of steel 12Х17

Chemical element %
Silicon (Si), not more 0.8
Manganese (Mn), not more than 0.8
Copper (Cu), not more than 0.30
Nickel (Ni), not more than 0.6
Sulfur (S), not more than 0.025
Titanium (Ti), not more than 0.2
Carbon ©, not more than 0.12
Phosphorus (P), not more than 0.035
Chrome (Cr) 16.0−18.0

Mechanical properties of steel 12X17

Heat treatment, delivery condition Section, mm σ0, 2, MPa σB, MPa δ5, % ψ, %
Rods. Annealed at 760−780°C, air or water 60 245 390 20 50
Hot- or cold-rolled sheets. Annealing or tempering at 750−780°C, air or furnace (crosswise samples) >4   440 18  
Hot- or cold-rolled sheets. Annealed or tempered at 740−780°C (cross samples) <3,9   490 20  
Seamless hot-deformed pipes without heat treatment 3,5−32   441 17  
Seamless cold- and heat-treated pipes, heat-treated 0,2−22   441 17  

Mechanical properties at elevated temperatures

t test,°C σ0, 2, MPa σB, MPa δ5, % ψ, %
Annealing at 780 °C, cooling in air.
20 310 510 28 70
100 290 450 27  
200 265 460 26  
300 255 440 25  
600 145 195 60  
Sample diameter 10 mm, length 50 mm, rolled. Deformation rate 1.1 mm/minute. Strain rate 0.0004 1/s.
700   84 67 97
800   40 64 98
900   22 58 98
1000   21 81 97
1100   14 73 97
1200   8 85 99
1300   6 99 97

Technological properties of steel 12X17

Forging temperature
The beginning 1250, the end 900. Sections up to 350 mm are cooled in the air.
Weldability
Difficult-to-weld. Welding methods: RDS, ArDS. Subsequent heat treatment is recommended.
Tendency to tempering ability.
Tends to temper at 475 C for long dwell times.

Steel 12X17 critical point temperature.

Critical point °С
Ac1 860
Ar1 810

Impact toughness of steel 12X17

Impact toughness, KCU, J/cm2

Delivery condition, heat treatment +20 -30 -70
Delivery condition 34 6 3

Steel hardness 12Х17

Delivery condition, heat treatment regime HRCe surface
Cementation at 950 C, 12 hours in a solid carburetor (85% birch charcoal, 10% soda, 50% barium carbonate). Hardening at 1000 C, oil. Tempering at 180 C. St. 56.

Physical properties of steel 12Х17

Test temperature, °С 20 100 200 300 400 500 600 700 800 900
Modulus of normal elasticity, E, GPa 232 227 219 211 201 192 182 165 148  
Torsional shear modulus of elasticity G, GPa 93 89 85 82 78 85 69 61    
Steel density, pn, kg/m3 7720                  
Thermal conductivity coefficient W/(m - °C)   24 24 25 26 26        
Electrical resistivity (p, nominal value - m) 560 610 680 770 850 950 1030 1110 1150 1160
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) 10.4 10.5 10.8 11.2 11.4 11.6 11.9 12.1    
Specific heat capacity (C, J/(kg -°C)) 462