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08Cr18Ni10 steel

08Cr18Ni10 steel

Steel 08Cr18Ni10: a classifier of steels and alloys. Below is systematized information on the purpose, chemical composition, types of supply, substitutes, critical point temperature, physical, mechanical, technological and foundry properties for the brand - Steel 08Cr18Ni10.

General information on 08Cr18Ni10 steel

Type of delivery
Sheet 08X18N10, round 08X18N10, tape 08X18N10, section rolled, 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. Tape GOST 4986−79. GOST 4405−75 GOST 103−76 stripe. GOST 18143−72 wire. Forgings and forged blanks GOST 1133−71, GOST 25054−81. Tubes GOST 9940−81, GOST 9941−81.
Application
Pipes, parts of furnace fittings, heat exchangers, muffles, retorts, nozzles, exhaust manifolds, spark plug electrodes, welded apparatus and vessels of chemical engineering operating at temperatures from -196 to 600 °C in medium activity. The steel is corrosion-resistant and heat-resistant of austenitic class.

Chemical composition of steel 08Х18Н10

Chemical element %
Silicon (Si), not more 0.8
Manganese (Mn), not more than 0.2
Copper (Cu), not more than 0.30
Nickel (Ni) 9.0−11.0
Sulfur (S), not more than 0.020
Titanium (Ti), not more than 0.5
Carbon ©, not more than 0.8
Phosphorus (P), not more than 0.035
Chrome (Cr) 17.0−19.0

Mechanical properties of 08Cr18Ni10 steel

Heat treatment, delivery condition Section, mm σ0, 2, MPa σB, MPa δ5, % δ4, % ψ, %
Rods. 1020−1100°C hardening, air, oil, water. 60 196 470 40   55
Grinded bars, machined to the specified strength 1−30   640−780 20    
Hot- and cold-rolled sheets. Hardened 1050−1100°C, water or air. >4 206 509 43    
Forgings. Tempering 1050−1100°C, water or air. <1000 196 470 40   45
Cold-rolled steel tape. Hardened 1050−1080°C, water, air. 0,2−2,0   540   40  
Heat-treated wire 0,2−2,0   590−880 20    
Bulk wire 0,2−2,0   1080      

Mechanical properties at elevated temperatures

t test,°C σ0, 2, MPa σB, MPa δ5, % ψ, %
Tempering at 1000−1120°C, cooling in water.
20 210 570 60 70
400 110 410 46 69
480 98 380 45 69
540 96 360 44 70
600 82 330 39 58
650 76 290 37 44
700 74 235 35 36
750 73 185 31 28
800 69 150 30 18

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
      39 10000 704
      18 10000 815

Technological properties of 08Cr18Ni10 steel

Forging temperature
Beginning temperature 1200, ending temperature 850. Sections up to 300 mm are cooled in stacks in the air.
Weldability
no restrictions. Welding method: РДС - electrodes ОЗЛ-8, ОЗЛ-12 on wires 02Х19Н9, КТС, ЭШС. The subsequent heat treatment is recommended.

Impact toughness of steel 08X18N10

Impact toughness, KCU, J/cm2

Delivery condition, heat treatment +20 -40 -78
Cold-rolled condition 75−93 78−93 71−75
Hot rolled condition 187−206 183−301 184−302

Corrosion properties of 08Cr18Ni10 steel

Medium Temperature, °C Test duration, h Depth, mm/year
Water, steam 600   0,1
Seawater 20   0,1
5% H2SO4 solution 20 384 0,6

Physical properties of 08Cr18Ni10 steel

Test temperature,°C 20 100 200 300 400 500 600 700 800 900
Modulus of normal elasticity, E, GPa 196                  
Steel density, pn, kg/m3 7850                  
Thermal conductivity coefficient W/(m - °C) 17                  
Electrical resistivity (p, nominal value - m) 800                  
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 17.0 18.0 18.0          
Specific heat capacity (C, J/(kg -°C)) 504