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Steel 60CrNiG

R6M5K5 Р18 R9M4K8 Р9 45CRNIM 60XH 75CSMF 9Х2 55Х 60CSMF 7X2CMF 9X2MF 60CR2SMF 75CRM 90XMF 60XG 75CRMOV 90XF CB4F 9XVG. CVG 9HS 9Х1 У10 У12 У7 U10A U12A U7A У8 U8A U9A У9 27Х2Н2М1Ф 4X5MFS 6XV2C 7XG2VMF Х12 X12MF 40X5MF 4XV2C 5CHEV2C 6CVG X12VM X12F1 3CR2V8F 4CMFS 5CGM 6HS 8Х3 X6VF. 3Х2Н2МВФ 4Х2НМФ 4X5MF1S 5CRNIM 7Х3

Steel 60KhG

Steel 60KhG: 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 grade — Steel 60KhG.

General information on steel 60XG

The substitute for the brand
steel 55Х.
Delivery type
rolls OST 24.013.21−85.
Application
Working rolls of strip and small-section mills for hot rolling of metals.

Chemical composition of steel 60XH

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.80−1.00
Nickel (Ni), not more 0.40
Sulfur (S), not more than 0.040
Carbon (C) 0.55−0.65
Phosphorus (P), not more than 0.040
Chromium (Cr) 1.00−1.30

Mechanical properties of steel 60Cr

Mechanical properties

Heat treatment, delivery condition Section, mm HB HRCe
Rolls barrels of rail and section mills. Normalization. Tempering. <950 229−285  
Rolls barrels of rail and section mills. Hardening. Tempering. <500 255−302  
Surface hardening with HFI heating, low tempering, water cooling     51−63
Surface hardening with HF heating, low tempering, emulsion cooling     42−57

Mechanical properties of rolls at different heat treatment regimes

Heat treatment, delivery condition σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2 HB
Rolls with diameter up to 600 mm/yu Furnace at 650 °C, 4hour exposure, 100 deg/hr heating to 820−860 °C, 4hour exposure, air cooling to 400 °C, then withFurnace to 360 °C, holding for 10 h, heating 100 deg/h to 630−660 °C, holding for 50 h, cooling 40 deg/h to 400 °C, then from 15 deg/h to 120 °C, holding for 4 h, air.
The sample cutout location is K 440−550 800−910 15−20 36−41 27−44 229−255
Sample cutout location — ½R 460−520 810−900 15−18 30−38 24−39 229−255
Sample cutout location — 1/3R 510−550 860−910 15−17 32−36 27−29 241−255
Sample cutout location — C 430−540 810−920 12−18 28−36 24−34 229−255
Rolls with diameter of over 600 mm. Setting in the furnace at 630−660°С, holding for 8 hours, air cooling to 330−360°С, heating from 100 deg/h to 820−860°С.C, holding for 4 hours, air cooling to 330−360°С, holding for 6 hours, heating from 100 deg/h to 630−660°С, holding for 40−50 hours.
Specimen cutout location — K 390−580 710−940 14−20 28−52 18−59 207−255
Sample cutout location — ½R 390−580 710−950 14−21 28−51 15−59 207−269
Sample cutout location — C 450 840 15 23 16 241

Technological properties of 60KhG steel

Forging temperature
The beginning 1220, the end 800. Sections up to 200 mm are cooled in the pit, 201−800 mm are subjected to annealing with recrystallization and one supercooling.
Weldability
not applicable for welded structures.
Machinability
In the normalized and tempered state at HB 235−285 and σB = 670 MPa K υ dv.spl. = 0.9, Kυ b.st. = 0.75.
The tempering capacity
inclined
Flocke sensitivity
sensitive

Temperature of critical points of 60CrNiG steel

Critical point °С
Ac1 750
Ac3 800
Mn 250

Impact toughness of steel 60CrNiG

Impact toughness, KCU, J/cm2

Delivery condition, heat treatment +20 -20 -40
Hardening 870 C, oil Tempering 650 C, oil. 88 38 38

Steel hardness 60XH

Delivery condition, heat treatment regime HRCэ surface HB
Rolls barrels of rail and section mills. Section up to 950 mm. Normalization. Tempering.   229−285
Rolls barrels of rail and section mills. Section up to 500 mm. Hardening. Tempering.   255−302
Surface hardening with HFI heating, low tempering, water cooling 51−63  
Surface hardening with HFI heating, low tempering, emulsion cooling 42−57  

Hardenability of steel 60CrNiG

Distance from end face, mm / HRCe
 
 
Quantity of martensite, % Crit. dia. in water, mm Crit. dia. in oil, mm Cret. hardness, HRCe
50 60−102 34−68 52−54
95 23−66 6−40 61−64