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CVG steel

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

CrCrNiNG Steel

XVG Steel: Handbook 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 — Steel XVG.

General information on HVG steel

The substitute for the brand
Steel grades: 9HS, ХГ, 9ХВГ, ХВСГ, ШХ15СГ.
Type of delivery
Kvg Round, Kvg Sheet, Kvg Strip, bars, including shaped: GOST 5950−73, GOST 2590−71, GOST 2591−71. Calibrated bar GOST 5950−73, GOST 7417−75, GOST 8559−75, GOST 8560−78. Grinded rod and silversilver GOST 5950−73, GOST 14955−77. Strip GOST 4405−75. Forgings and forged blanks GOST 5950−74, GOST 1133−71, GOST 7831−78.
Application
Measuring and cutting tools for which high warping during quenching is unacceptable, thread gauges, broaches, long taps, long reamers and other types of special tools, cold heading dies and punches, industrial equipment.

Chemical Composition of CrCrNiG Steel

Chemical element %
Tungsten (W) 1.20−1.60
Silicon (Si) 0.10−0.40
Manganese (Mn) 0.80−1.10
Copper (Cu), not more than 0.30
Molybdenum (Mo), not more than 0.30
Nickel (Ni), not more than 0.35
Sulfur (S), not more than 0.030
Carbon (C) 0.90−1.05
Phosphorus (P), not more than 0.030
Chromium (Cr) 0.90−1.20

Process properties of CrNiG steel

Forging temperature
The beginning 1070, the end 860. Delayed cooling.
Weldability
Not applicable for welded structures.
Machinability
In the hot-rolled condition at HB 235 and σB = 760 MPa Kυ dv.spl. = 0.75, Kυ b.st. = 0.35.
Tendency to tempering capacity
Slightly inclined
Flocke sensitivity
sensitive
Grindability
at HRCe 59−61 reduced; at HRCe 55−57 — satisfactory

Temperature of critical points of HVG steel

Critical point °С
Ac1 750
Ac3 940
Ar1 710
Mn 210

Impact toughness of steel CVG

Impact toughness, KCU, J/cm2

Delivery condition, heat treatment KCU HRCe
Section 15 mm, sample cut ½R. Fine grain hardening. Tempering at 150−160°C. 40 64
Section 25 mm, the place of cutting of the sample ½R. Small grain hardening. Tempering at 150−160°C. 30 64
Section 50 mm, the place of cutting of the sample ½R. Small grain hardening. Tempering at 150−160°C. 20 63
Section 100 mm, the place of cutting of the sample ½R. Small grain hardening. Tempering at 150−160°C. 15 61

Hardness of steel ХВГ

Delivery condition, heat treatment regime HRCe surface HB
Rings and strips annealed or high-temperatured   255
Samples. Hardened at 830 C, oil. Tempering 180 C 61  
Isothermal annealing at 780−800 C, cooling at 50 deg/h to 670−720 C, 2−3 h, cooling at 50 deg/h to 550 C, air.   255
Heating at 650−700 C. Hardening at 830−850 C, oil. Tempering at 150−200 C, air (final heat treatment mode) 63−64  
Heating at 650−700°C. Tempering at 830−850°C. Tempering 200−300 C, air (final heat treatment mode) 59−63  
Billets with the cross-section up to 50−60 mm. (Billets up to 50 mm section are hardened with cooling in oil, over 50 mm — in molten salt with water). Quenching at 840 C, oil or molten salts with water at 200 C. Tempering 180−220 C. 59−63  
Billets with a section up to 50−60 mm. (Billets up to 50 mm section are hardened with cooling in oil, over 50 mm — in molten salts with water). Quenching at 840 C, oil or molten salts with water at 200 C. Tempering at 230−280 C. 57−61  
Billets with a section up to 50−60 mm. (Billets up to 50 mm section are hardened with cooling in oil, over 50 mm — in molten salts with water). Quenching at 840 C, oil or molten salts with water at 200 C. Tempering 280−340 C. 55−57  
Tempering at 820 C in oil. Tempering at 100 C. 66  
Hardening 820 C., oil. Tempering at 200 C. 64  
Hardening 820 C., oil. Tempering at 300 °C. 61  
Hardening 820 C., oil. Tempering 400 C. 57  
Hardening 830−850 C., oil. Tempering at 170−200 C. 63−64  
Tempering at 830−850°C, oil. Tempering at 200−300°C. 59−63  
Tempering at 830−850°C, oil. Tempering 300−400 C. 53−59  
Tempering at 830−850°C, oil. Tempering 400−500 C. 48−53  
Tempering at 830−850°C, oil. Tempering 500−600 C. 39−48  

Hardenability of steel CVG

Distance from the end face, mm / HRCe
2.5 5 7.5 10 15 20 25 30 35 45
65−67 62,5−66,5 57−66 49,5−65,5 41,5−63 38,5−60 37,5−55,5 38−51,5 36−47,5 35−43,5
Heat treatment Crit. dia. in oil, mm Hardness, HRCe
Hardening 15−70 61

Physical properties of HVG steel

Test temperature,°C 20 100 200 300 400 500 600 700 800 900
Steel density, pn, kg/m3 7850 7830   7760     7660      
Electrical resistivity (p, nominal value — m) 380                  
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) 11.0 12.0 13.0 13.5 14.0 14.5        

Heat resistance, red resistance of steel CVG

Heat resistance

Temperature, °C Time, h Hardness, HRCэ
150−170 1 63
200−220 1 59

Mechanical properties of CVG steel at room temperature

ND Heat treatment mode Section, mm σ0.2, H/mm2 σR, H/mm2 δ,% Ψ, % KCU, J/cm2 HRC HB
Operation t, °C Cooling medium not less
STATE STANDARD 5950−2000 Annealing 770−790 With furnace at 30 °C/h - Not defined - ≤255
Hardening 820−840 Oil samples ≥60 -
Tempering 180 Air  
DC Isothermal annealing 780−800 With furnace at 50 °C/h up to 670−720 °C, holding time 2−3 h; with furnace at 50 °C/h up to 550 °C; air samples Not defined - ≤255
heating 650−700   samples Cannot be determined 62−63 -
quenched 830−850 Oil  
tempering 150−200 air  
preheating 650−700   samples Cannot be determined 58−62 -
quenched 830−850 Oil  
tempering 150−200 air  
Fine grain hardening   Sample cutout location — ½ R
16 - 40 63 -
25 30 63
vacation 150−160 50 20 62
100 15 60