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Alloy 06XHN28MDT

Alloy 06CrN28MdT

Alloy 06CrN28MdT: 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 - Alloy 06KhN28MDT.

General data on 06CrN28MdT alloy

Grade replacement
03CrNi28MdT alloy.
Delivery type
Tube 06hn28mdt, sheet 06hn28mdt, Circle 06hn28mdt, bars, including shaped: GOST 5949−75, GOST 2590−71, GOST 2591−71. Calibrated bar GOST 7417−75, GOST 8559−75, GOST 8560−78. Grinded rod and silver GOST 14955−77. Sheet thick GOST 7350−77, GOST 19903−74, GOST 19904−74. Sheet thin GOST 5582−75, GOST 19903−74, GOST 19904−74. GOST 4405−75 GOST 103−76. Forgings and forged blanks GOST 1133−71, GOST 25054−81. Tubes GOST 9941−81, GOST 11068−81.
Application
Welded structures operating at the temperatures up to 80 °C in sulfuric acid of different concentrations, except for 55% acetic and phosphoric acids.

Chemical composition of alloy 06ХН28МДТ

Chemical element %
Silicon (Si), not more 0.8
Manganese (Mn), not more 0.8
Copper (Cu) 2.5−3.5
Molybdenum (Mo) 2.5−3.0
Nickel (Ni) 26.0−29.0
Sulfur (S), max. 0.020
Titanium (Ti) 0.5−0.9
Carbon ©, not more than 0.06
Phosphorus (P), not more 0.035
Chrome (Cr) 22.0−25.0

Mechanical properties of 06CrNi28MdT alloy

Heat treatment, delivery condition Section, mm σ0, 2, MPa σB, MPa δ5, % δ4, % ψ, % KCU, J/m2
Hot- and cold-rolled sheets. Hardened 1050−1080°C, water or air. <3,9   540 35      
Cold-rolled band. Hardened 930−1050°C, water or air. <0,2   560   13    
Cold-rolled strip. Hardened 930−1050°C, water or air. 0,2−2,0   560   25    
Forgings. Tempering 1050−1100°C, water or air <1000 216 510 30   30  
Seamless cold- and heat-treated seamless heat-treated pipes 0,2−22   490 30      
Tube billet. Hardened 1100−1150°C, air, oil or water. 80 195 490 45   70  
Tube workpiece. Hardened 1050−1080°C, water.   245 540 35   50 98

Mechanical properties at elevated temperatures

t test,°C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
12 mm thick sheet. 1050 °C hardening, water.
20 270 620 55 78 350
200 210 550 45 75 350
400 180 550 50 60 350
600 150 500 45 60 350
Sheet thickness 16 mm. Hardened at 1080 °C, water.
800 180 250 40 45 110
900 150 180 30 40 120
1000 90 100 25 40 100
1100   50 35 40 100

Mechanical properties depending on the degree of cold plastic deformation

Heat treatment, delivery condition σ0, 2, MPa σB, MPa δ5, % ψ, %
1050 °C hardening, water
Degree of deformation - 0% 230 600 23 62
Degree of deformation - 10% 710 750 20 42
Degree of deformation - 20% 750 810 15 42
Degree of deformation - 40% 930 950 10 40
Degree of deformation - 60% 1080 1100 3  
Degree of deformation - 80%   1200 2  

Technological properties of 06XH28MDT alloy

Forging temperature
Beginning 1170, end 900.
Weldability .
Welding methods: РДС, АДС under flux and gas shielding.
Machinability
It is machinable satisfactorily.

Physical properties of the alloy 06ХН28МДТ

Test temperature, °С 20 100 200 300 400 500 600 700 800 900
Modulus of normal elasticity, E, GPa   191 186 179 171 161 156 151 145  
Steel density, pn, kg/m3 7960                  
Thermal conductivity coefficient W/(m ?°C) 13 13 15 17   22 24 25 26  
Electrical resistivity (p, nom? m) 750                  
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) 10.9 12.9 13.6 14.4 14.9 15.3 16.8 16.3 16.8