20KHN Alloy structural steel

Steelun Designation of 20KHN Alloy structural steel:

Name The value
Designation GOST Cyrillic 20ХН
Designation GOST Latin 20XH
Transliteration 20HN
By chemical elements 20CrН

Description Steelun of 20KHN Alloy structural steel:

20KHN steel is used: for the manufacture of gears, bushings, fingers, fasteners and other parts, which require high viscosity and moderate hardenability.

Note

Structural steel high-quality stainless.

Steelun Standards of 20KHN Alloy structural steel:

Name Code Standards
Sheets and strips В23 GOST 103-2006
Bars and shapes В32 GOST 1051-73, GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-1-2118-77, TU 14-11-245-88, TU 14-1-5228-93, TU 14-136-367-2008
Bars and shapes В22 GOST 1133-71, GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-4944-90

Chemical composition Steelun of 20KHN Alloy structural steel:

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
GOST 4543-71 0.17-0.23 ≤0.035 ≤0.035 0.4-0.7 0.45-0.75 0.17-0.37 1-1.4 Rest ≤0.3 ≤0.05 ≤0.03 ≤0.15 ≤0.2
Fe is the basis.
According to GOST 4543-71 the content in high-quality steel is regulated: P≤0,025%; S≤0.025%; Сu≤0.30%; in high-grade steel: P≤0,025%; S≤0.015%; Сu≤0.25%.

Steelun Mechanical properties of 20KHN Alloy structural steel:

Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HRC
Quenching in water or oil from 860 °C + quenching in water or oil with 760-810 °C + vacation at 180 °C, cooling in water or oil
≤15 590 780 14 50 765
Quenching in oil from 860 °C to + vacation at 180 °C
100 510 860 10 90
Sample a cross section of 10 mm. Quenching in oil from 850 °C + vacation
200 1050 1290 11 48 90 62
Quenching in oil from 860 °C to + vacation at 180 °C
20 750 1130 10 85
Sample a cross section of 10 mm. Quenching in oil from 850 °C + vacation
300 1000 1220 50 80 60
Quenching in oil from 860 °C to + vacation at 180 °C
40 600 990 10 90
Sample a cross section of 10 mm. Quenching in oil from 850 °C + vacation
400 910 1100 11 51 75
Quenching in oil from 860 °C to + vacation at 180 °C
80 520 870 10 90
Sample a cross section of 10 mm. Quenching in oil from 850 °C + vacation
500 770 950 14 54 110
600 650 770 20 60 180

Description mechanical marks steelun of 20KHN Alloy structural steel:

Name Description
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d5 Elongation after rupture
y The relative narrowing
KCU Toughness
HRC Rockwell hardness (indenter diamond spheroconical)

Steelun Technological properties of 20KHN Alloy structural steel:

Name The value
Weldability limited weldability. [2].
The tendency to temper brittleness tend [81]
The temperature of forging Start – 1250 °C, end – 830 °C. [108]. Sections up to 50 mm are cooled in air, 50-100 mm in mulde, 101-200 mm in a closed trough.
Flock-sensitive sensitivity sensitive [81]

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