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Steel 08Cr13

Steel 08Cr13

Steel 08Cr13: 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 08Cr13.

General information about 08Cr13 steel

Substitute for the brand
To substitute for steel grade: 12Х13, 12Х18Н9Т.
Type of delivery
Sheet 08X13, pipe 08X13, circle 08X13, section rolled, including shaped: GOST 5949−75, GOST 2590−71, GOST 2591−71, GOST 2879−69, GOST 18968−73, GOST 19442−74. 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 103−75, GOST 18968−73. Forgings and forged blanks GOST 1133−71, GOST 18968−73, GOST 25054−81. Tubes GOST 9941−81, GOST 9940−81.
Application of
The parts with the increased plasticity subjected to shock loads (valves of hydraulic presses, household goods), as well as goods subjected to slightly aggressive media (atmospheric precipitation, aqueous solutions of salts of organic acids at room temperature and others), steam turbine blades, valves, bolts and pipes. Steel is corrosion-resistant and heat-resistant of ferritic class.

Chemical composition of 08Cr13 steel

Chemical element %
Silicon (Si), not more 0.8
Manganese (Mn), not more 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 0.08
Phosphorus (P), not more than 0.030
Chrome (Cr) 12.0−14.0

Mechanical properties of 08Cr13 steel

Heat treatment, delivery condition Section, mm σ0.2, MPa σB, MPa δ5, % ψ, % KCU, J/m2 HB
Cores. Hardening at 1000−1050°C, oil. Tempering 700−800°C, oil. 60 410 590 20 60 98  
Hot- or cold-rolled sheets. Hardening 960−1020°C, water or air. Tempering 680−780°C, air or furnace. (Transverse samples) >4 294 422 23      
Forgings. Tempering 1000−1050°C, oil. Tempering 700−780°C, oil. <1000 392 539 14 35 49 187−229

Mechanical properties at elevated temperatures

t test,°C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
Sheet of 20 mm cross-section. Tempering at 1000−1020°C with water. Tempering at 680−700°C, holding for 12 hours, air. At 20 °C NV 148−156.
20 275−350 460−510 25−37 73−80 235−323
100 275−295 430 28−29 77−79 353
200 245−275 400−420 27−29 75−78 333−372
300 235−275 380−400 22−27 73−77 333−363
400 215−255 340−470 23−26 71−79 343−363
450 195−245 310−320 23−30 72−77 323−343
500 185−225 215−285 26−37 73−84 294−323
600 145−165 165−180 34−45 87−89 245−265
Bar cross section of 20 mm. Annealing.
20 285 480 36 84 295
400 210 350 30 82  
500 160 290 40 85  
600 105 170 51 92  

Mechanical properties depending on heat treatment

Heat treatment, delivery condition σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
Sheet. Hardening at 1000−1002°C. Without heat soaking. 314−353 500−510 29−31 73−75 2352−2842
Tempering 680−700°C, 12 h. Heat soaking at 450 °C, 5000 h. 310 490 35 74 227

Technological properties of 08Cr13 steel

Forging temperature
The beginning 1220, the end 850. Sections up to 300 mm are cooled in stacks in the air.
Weldability
Limited weldability. Welding methods: RDS, ADF under flux, ArDS and CTS. Heating and heat treatment are used depending on the welding method, type and purpose of construction.
Machinability
In the hardened and tempered state at HB 149−159 and σB = 590 MPa K υ dv.spl. = 0,7, Kυ b.st. = 1,4.
The tempering capacity
inclined at temperatures of 400−500 С.

Temperature of 08Cr13 steel critical points

Critical point °С
Ac1 730
Ac3 850
Ar3 820
Ar1 700

Impact toughness of 08Cr13 steel

Impact toughness, KCU, J/cm2

Delivery condition, heat treatment -20 -40 -60
Sheet cross section of 20 mm. Hardening 1000−1020 C, water. Tempering 680−700 C, cooling for 12 hours, air. 6−11 4−7 1−5

Physical properties of 08Cr13 steel

Temperature, °C 20 100 200 300 400 500 600 700 800 900
Modulus of normal elasticity, E, GPa 217 212 206 198 189 180        
Torsional shear modulus of elasticity G, GPa 85 80 80 77 73 68 62      
Steel density, pn, kg/m3 7760 7740 7710              
Thermal conductivity coefficient W/(m — °C)   28 28 28 28 27 26 26 25 27
Electrical resistivity (p, nominal value — m) 506 584 679 769 854 938 1021 1103    
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) 10.5 11.1 11.4 11.8 12.1 12.3 12.5 12.8    
Specific heat capacity (C, J/(kg -°C)) 462