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Steel 14X17H2

14Cr17Ni2 Steel

Steel 14Cr17N2: 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 grade — Steel 14Cr17N2.

General information about 14Cr17N2 steel

Grade substitute
steel 20Х17Н2.
Type of delivery
Circle 14х17Н2, sheet 14х17Н2, hexagon 14х17Н2, nut 14х17Н2, bolt 14х17Н2, 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, GOST 18907−73. Sheet thick GOST 7350−77. Thin sheet GOST 5582−75. GOST 4405−75 GOST 103−76. Forgings and forged blanks GOST 1133−71.
Application
Blades, disks, shafts, sleeves, flanges, fasteners and other parts, compressor machine parts operating on nitrous gas, parts operating in hostile environments and at low temperatures. Steel is corrosion-resistant and heat-resistant martensitic-ferritic.

Chemical composition of steel 14Х17Н2

Chemical element %
Silicon (Si), not more 0.8
Manganese (Mn), not more 0.8
Copper (Cu), not more than 0.30
Nickel (Ni) 1.5−2.5
Sulfur (S), not more than 0.025
Titanium (Ti), not more than 0.2
Carbon (C) 0.11−0.17
Phosphorus (P), not more than 0.030
Chrome (Cr) 16.0−18.0

Mechanical properties of steel 14Х17Н2

Heat treatment, delivery condition Section, mm σ0.2, MPa σB, MPa δ5, % ψ, % KCU, J/m2 HB
Rods. Hardening 975−1040°C, oil. Tempering at 275−350°C, air 60 835 1080 10 30 49  
Tempering 1000−1030°C, oil. Tempering 620−660°C, air 60 635 835 16 55 75  
Hot- or cold-rolled sheets. Quenching 960−1050°C, water or air. Tempering at 275−350°C, air (crosswise samples). Samples 882 1078 10      
Forgings. Quenching 980−1020°C, oil. Tempering 680−700°C, air. <1000 637 784 12 30 49 248−293
Forgings. Tempering 1010−1030°C, oil. Double tempering 665−675°C, furnace or air. <100 540 690 15 40 59 228−269

Mechanical properties at elevated temperatures

t test,°C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
Bar. Annealing 760−780°C, 2 h, cooling with furnace. Hardening at 950−975°C, 1hr, oil. Tempering at 600 °C, 3−6 h. At 20 °C NV 269−302
20 680−710 860−880 19−22 60−63 118−147
300 620−640 720 16 65−67  
400 580−590 670−680 14−15 63−64  
500 510 550−570 17−18 68−70  
550 430 460 20 81  
Disc forgings 700 mm in diameter and 30−80 mm in height. Annealing with two supercoolings 200−230°C and 140−180°C. Tempering at 960−980°C, oil. Tempering at 640−670°C. (Tangential samples). At 20 °C NV 285.
20 680−690 870−890 16 52−55 90−101
200 630−650 780 12−15 47−53 93−108
300 610−630 730−760 11−13 50−53 108−132
400 600−630 730−750 11−12 45 98−117
500 500−540 560−610 15 54−56 108−122
600 280−310 330−340 28−30 83−84 127
Deformed state. Deformation rate 2.5 mm/minute.
700   215 58 90  
800   145 70 92  
900   98 75 88  
1000   59 80 90  
1100   29 80 90  
1200   20 80 88  
1250   20 68 80  

Mechanical properties depending on tempering temperature

t tempering temperature, °C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2 HB
Bar. Annealing 760−780°C, 2h, cooling with furnace. Hardening 950−975°C, 1h, oil.
300 930−950 1260−1280 16 59−61 78−95 400−444
400 980−1050 1290−1330 16−17 60−62 61−68 388−444
500 970−1000 1110−1200 14−15 60 54−98 363−388

Mechanical properties in the long term strength test

Creep strength, MPa Creep rate, %/h t test,°C Ultimate long-term strength, MPa Test duration, h t test, h
274 2/100 450 608−686 1000 400
      588−666 2000  
      617 200 450

Technological properties of steel 14Х17Н2

Forging temperature
The beginning 1250, the end 900. Sections up to 350 mm are cooled in the air.
Weldability
Difficult-to-weld. Welding method RDS, ArDS. Welded joints in the heat-affected zone have lower resistance to SCC and general corrosion, therefore tempering at 680−700 C for 30−60 minutes is necessary after welding.
Machinability
In the quenched and tempered condition with HB 330 Kυ dv.spl. = 0,4, Kυ b.st. = 0,3.
Tempering capacity
inclined .

Steel 14Х17Н2 critical point temperature

Critical point °С
Ac1 720
Ac3 830
Ar1 700

Impact toughness of steel 14Х17Н2

Impact toughness, KCU, J/cm2

Delivery condition, heat treatment +20 -20 -40 -60
10 mm thick sheet in delivery condition. Transverse samples. 56 51 49 47
10 mm thick sheet in the state of delivery. Samples longitudinally. 71 53 53 52

Endurance limit of steel 14Х17Н2

σ-1, MPa n
451 1Е+7

Corrosion properties of 14Cr17Ni2 steel

Medium Test temperature, °C Test duration, h Depth, mm/year
Distilled water 300 50 0,08
Steam-air 100 100 0,005

Heat resistance of steel 14Х17Н2

Medium Temperature,°C Depth, mm/year Resistance group or grade
Air 900 0,904 Reduced-resistant
Air 1000 2,010 Low-resistant

Physical properties of steel 14Х17Н2

Test temperature,°C 20 100 200 300 400 500 600 700 800 900
Modulus of normal elasticity, E, GPa 193     164   148 133      
Steel density, pn, kg/m3 7750                  
Thermal conductivity coefficient W/(m — °C) 21 22 23 24 24 25 26 27 28 30
Electrical resistivity (p, nominal value — m) 720 780 840 890 990 1040 1110 1130 1160 1170
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) 9.8 10.6 11.8 11.0 11.1 11.3 11.0 10.7 11.4 11.5
Specific heat capacity (C, J/(kg -°C)) 462