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75XM 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

Steel 75CrM

Steel 75CrM: 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 brand — Steel 75CrM.

General information on steel 75CrM

Substitute for the brand
steel 9Х2.
Delivery type
Rolls OST 24.013.20−85, OST 24.013.04−83.
Application
Working and supporting rolls of sheet mills for hot rolling of metals, supporting rolls for hot rolling of ferrous metals, supporting rolls of two-and four-roll stands of sheet mills for cold rolling of metals.

Chemical composition of steel 75XM

Chemical element %
Silicon (Si) 0.20−0.60
Manganese (Mn) 0.20−0.70
Molybdenum (Mo) 0.20−0.30
Nickel (Ni), max. 0.50
Sulfur (S), not more than 0.030
Carbon (C) 0.70−0.80
Phosphorus (P), not more than 0.030
Chromium (Cr) 1.40−1.70

Mechanical properties of steel 75CrM

Mechanical properties

Heat treatment, delivery condition Section, mm HRCe
Barrels or mandrels of support rolls (after heat treatment) with higher hardness requirements, type 4 <1600 HSD 70−85
Barrels or mandrels of backup rolls (after heat treatment) with increased hardness requirements, type 5 <1600 HSD 45−69
Support roll necks.   HSD 30−55
Barrels of work rolls of hot strip mills. Normalization. Tempering <1000 HSD 35−55
Hardening. Tempering. <1000 HSD 45−60
Working (or bearing) roll necks of hot strip mills. Normalization. Tempering.   HSD 30−60
Support rolls barrels of hot rolling mills. Normalization. Tempering. <1600 HSD 35−60
Hardening. Tempering. <1600 HSD 45−75

Mechanical properties depending on the cross section

Heat treatment, delivery condition Section, mm σ0, 2, MPa σB, MPa δ5, % ψ, % KCU, J/m2 HB
Normalization at 950 °C. Normalizing at 820 °C. Tempering 500 °C, exposure 4 h, air.
Specimen cutting location K, direction Sr. 500 420 750 22 46 57 207
Sample cutout location — 1/3R, direction — Pr 500 430 750 19 41 24 199
Sample cutout location — C, direction — Pr 500 410 750 21 34 17 199
Sample cutout location — K, direction — P 500 450 770 19 36 31 207
Sample cutout location — ½R, direction — P 500 375 740 21 31 15 197
Sample cutout location — C, direction — P 500 365 740 9 9 22 211
Sample cutout location — K, direction — Pr 700 650 1060 13 20 22 285
Sample cutout location — 1/3R, direction — Pr 700 660 1040 10 13 20 285
Sample cutout location — C, direction — Pr 700   590     4 313
Sample cutout location — K, direction — P 700 425 840 16 21 24 229
Sample cutout location — ½R, direction — P 700 440 790 6 6 24 229
Sample cutout location — C, direction — P 700         19 229

Technological properties of 75XM steel

Forging temperature
The beginning 1200, 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 normalized state Kυ tv.spl. = 0.90, Kυ b.st. = 0.60.
Tendency to tempering ability
not prone
Flockensitivity
low sensitivity

Hardness of steel 75XM

Delivery condition, heat treatment regime HSD
Barrels or mandrels of support rolls (after heat treatment) with increased hardness requirements, type 4. Cross-section up to 1600 mm. 70−85
Barrels or mandrels of bearing rolls (after heat treatment) with increased hardness requirements, type 4. Cross-section up to 1600 mm. 45−69
Support roll necks 30−55
Barrels of work rolls of plate mills for hot rolling. Cross-section up to 1000 mm. Normalization. Tempering. 35−55
Barrels of working rolls of sheet mills for hot rolling. Section up to 1000 mm. Hardening. Tempering. 45−60
Necks of working (or supporting) rolls of sheet mills for hot rolling. Normalization. Tempering. 30−60
Barrels of supporting rolls of sheet mills for hot rolling. Section up to 1600 mm. Normalization. Tempering. 35−60
Barrels of bearing rolls of sheet mills for hot rolling. Section up to 1600 mm. Hardening. Tempering. 45−75

Physical properties of steel 75XM

Test temperature, °С 20 100 200 300 400 500 600 700 800 900
Steel density, pn, kg/m3 7900                  
Thermal conductivity coefficient W/(m — °C)   45 41 40 39 38 37 35 24 31
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)) 490 500 530 570 640 750 900 700 760 810