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Steel 90KhF

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Steel 90KhF

Steel 90KhF: Handbook 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 90KhF.

General information on steel 90KhF

Substitute for the brand
Steel grade: 9Х1, 9Х2.
Delivery type
Sections, including shaped: GOST 5950−73, GOST 2590−71, GOST 2591−71. Calibrated bar GOST 7417−75, GOST 8559−75, GOST 8560−78. Grinded rod and silversilver GOST 14955−77. Tape GOST 2283−79. Band GOST 4405−75. Forgings and forged blanks GOST 1133−71, GOST 7831−78. Rolls OST 24.013.04−83, OST 24.013.20−85, OST 24.013.21−85.
Application
Frame, band, circular saws, knives for cold metal cutting, trimming dies and cold deburring punches, punches. Working and supporting rolls for cold metal rolling. Working rolls of rail, heavy-gauge and wire cogging and section mills for hot metal rolling, subjected to intensive wear and working in conditions of minimal or moderate shock loads. Working rolls, support rolls and tires of composite support rolls of sheet, cogging and section mills for hot metal rolling.

Chemical composition of 90XF steel

Chemical element %
Vanadium (V) 0.15−0.30
Silicon (Si) 0.15−0.35
Manganese (Mn) 0.30−0.60
Copper (Cu), not more 0.30
Nickel (Ni), not more 0.35
Sulfur (S), not more than 0.030
Carbon (C) 0.80−0.90
Phosphorus (P), not more than 0.030
Chromium (Cr) 0.40−0.70

Mechanical properties of steel 90KhF

Mechanical properties depending on the section

Heat treatment, delivery condition σ0.2, MPa σB, MPa δ5, % ψ, % KCU, J/m2
Barrel of the support roll with the diameter of 1500 mm
Specimen cutout place — K, direction — Pr. 405−445 860−870 17−18 30−33 15
Sample cutout location — 2/3R, direction — Pr. 340−350 810 13−14 19−21 10−14
Sample cutout location — 1/3R, direction — Pr. 320−330 800−810 18 25−30 15−18
Specimen cutout location — K, direction — T 470−490 920 14 12−20 10
Sample cutout location — 2/3R, direction — T 305−320 770−780 15−18 13−22 14−19
Sample cutout location — 1/3R, direction — T 370−380 860 9−14 10−19 10
The neck of the profitable side of the support roll with a diameter of 450 mm.
Specimen cutout location — K, direction — Pr 500−510 980 14 23−24 9−15
Specimen cutout location — 1/3R, direction — Pr 490−510 960 9−13 11 10−15
Specimen cutout place — C, direction — Pr 480−520 930−970 12 18−20 12−16
Specimen cutout location — K, direction — T 500−540 970−980 7−9 7−10 12−14
Specimen cutout location — 1/3R, direction — T 500 940−950 6−7 7−8 10−12
Specimen cutout location — C, direction — T 465−485 900−920 4−5 5 8−12
The neck of the bottom side of the support roll.
Sample cutout location — K, direction — Pr. 490 940 16 31 20
The sample cutout location is 1/3R, the direction is Pr. 485 950 16 24 14
Sample cutout location — K, direction — T. 490 930 6 7 13
The sample cutout location is 1/3R, the direction is T. 455 880 5 5 3

Mechanical properties as a function of test temperature

t test temperature,°C σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2 HRCe
Normalizing at 870 °C. Tempering 650 °C.
20 670 990 19 55 45 31
580 325 390 31 81 81  
600 265 320 32 72 72  

Technological properties of steel 90KhF

Forging temperature
The beginning 1150, the end 800. Sections up to 100 mm are cooled in the air, 101−350 mm — in the pit.
Weldability
Not applicable for welded structures.
Machinability
In the annealed state at HB 187−196 and σB = 680 MPa Kυ dv.spl. = 0.9, Kυ b.st. = 0.6.
The tendency to tempering capacity
inclined
Floc-sensitivity
hypersensitive

Temperature of critical points of 90KhF steel

Critical point °С
Ac1 700
Mn 215

Steel hardness 90KhF

Delivery condition, heat treatment regime HRCэ surface HB HSD
Annealed or highly tempered bars and strips   241  
Samples. Hardened 850−880 C, oil. Tempering at 820−840 C, water. St. 61    
Barrels of work rolls (after induction heat treatment): dressing and finishing stands of cold rolling mills, type 1. Cross-section up to 400 mm.     95−105
Barrels of work rolls (after induction heat treatment): stands of cold rolling mills, type 2. Cross-section up to 400 mm     90−96
Barrels of work rolls (after induction heat treatment): mills warm rolling, type 3. Cross-section up to 400 mm.     75−90
Barrels or support rolls (after heat treatment) with increased hardness requirements, type 4. Cross-section up to 1600 mm.     70−85
Barrels or bearing barrels (after heat treatment) with increased hardness requirements, type 5. Cross-section up to 1600 mm     45−69
Working and supporting roll necks     30−55
Rolls barrels of rail and section mills. Section up to 950 mm. Normalization. Tempering.   241−285  
Rolls barrels of rail and section mills. Section up to 950 mm. Hardening. Tempering.   352−429  
Rolls barrels of sheet rolling mills for hot rolling. Working rolls. Section 1000 mm. Normalization. Tempering     35−55
Rolls barrels of sheet rolling mills for hot rolling. Working rolls. Cross-section of 1000 mm. Hardening. Tempering     45−60
Rolls barrels of sheet rolling mills for hot rolling. Support rolls. Section 1600 mm. Normalization. Tempering     35−60
Rolls barrels of sheet rolling mills for hot rolling. Support rolls. Section 1600 mm. Hardening. Tempering     45−75
Working and supporting roll necks. Normalization. Tempering.     30−60
Barrels of supporting compound rolls. section up to 1600 mm. Normalization. Tempering     60−85

Endurance limit of steel 90KhF

σ-1, MPa n Heat treatment, state of steel
304 1Е+7 Samples are smooth. Normalizing at 870 °C. Tempering 600 С.

Hardenability of steel 90KhF

Distance from the end face, mm / HRCe
21 24
60 56
Heat treatment Crit. dia. in water, mm Crit. dia. in oil, mm Critical hardness, HRCe Spacing from the cooled end
Hardening. 15−20 5−8 60 21
      59 24

Physical properties of 90KhF steel

Test temperature,°C 20 100 200 300 400 500 600 700 800 900
Thermal conductivity coefficient W/(m — °C)   44 42 38 36 33 31 29 27 27
Test temperature,°C 20−100 20−200 20−300 20−400 20−500 20−600 20−700 20−800 20−900 20−1000
Specific heat capacity (C, J/(kg -°C)) 460 500 560 620 670 730 1320 720 640 650