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Steel 25KH1MF (ЭИ10)

Steel 15Kh5M (X5M) 30Cr3MA steel 30Kh3VA steel Steel 25X5M Steel 25Kh3MFA-A Steel 25Kh3MFA (48TS-4) Steel 25Kh2MFA (48TS-1) Steel 25Kh2M1F (EI723) Steel 25Х1МФ (ЭИ10) Steel 20Х3МВФ (ЭИ415) Steel 20Х1М1Ф1ТР (EP182) Steel 18Kh3MV (EI578) Steel 18Kh2MFA-A Steel 18Kh2MFA (48TS-3) 15CrM Steel Steel 15X5VF (X5VF) Steel 15X5 (X5) Steel 15Kh2MFA-A Steel 15Kh2MFA (48TS-3-40) Steel 13X9M (X9M) Steel 13Х3Н3М2ВФБ (VKS-10) 12XM steel Steel 12Kh8VF (1Kh8VF) Steel 12X8 (1X8) Steel 12Kh2MFA-A Steel 12Х2МФА (48ТС-2) Steel 12Kh1MF (12KhMF; 12KhMFA) 12MX steel Steel 08Х16Н9М2

Designation

Name The value
Designation GOST Cyrillic 25Х1МФ
Designation GOST Latin 25X1MF
Transliteration 25H1MF
The chemical elements 25Cr1MoV
Name The value
Designation GOST Cyrillic ЭИ10
Designation GOST Latin EI10
Transliteration EhI10
The chemical elements -

Description

25KH1MF steel is used: for the manufacture of bolts, flat springs, pins and other parts operating at temperatures up to +510 °C; mounting parts operating at temperatures from -40 °C to +500 °C; fasteners of nuclear power plants; pipelines with quenching in oil and tempering air; fasteners turbines and flange connections, steam pipelines and valves by cold machining and hot forming, operating at a steam temperature +500−580 °C.

Note

Steel parlingo class.
Temperature intense scaling +600 °C.

Standards

Name Code Standards
Sheets and stripes В23 GOST 103-2006
Sectional and shaped rolling В22 GOST 1133-71, GOST 2590-2006, GOST 2591-2006
Sheets and stripes В33 GOST 4405-75
Sectional and shaped rolling В32 GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST 20072-74, TU 14-1-1397-75, TU 14-1-5037-91, TU 14-1-552-72, TU 14-11-245-88
Thermal and thermochemical treatment of metals В04 ST ЦКБА 026-2005
Metal forming. Forgings В03 TU 0306.018-80, ST ЦКБА 010-2004

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
TU 14-1-552-72 0.22-0.29 ≤0.025 ≤0.03 0.4-0.7 1.5-1.8 0.17-0.37 ≤0.25 The rest ≤0.3 0.15-0.3 - 0.25-0.35 -
GOST 20072-74 0.22-0.29 ≤0.025 ≤0.03 0.4-0.7 1.5-1.8 0.17-0.37 ≤0.3 The rest ≤0.02 0.15-0.3 ≤0.03 0.25-0.35 ≤0.2
Fe is the basis.
According to GOST 20072-74 steel grade 25X1MF can be manufactured with a mass fraction of molybdenum in the range of 0.6-0.8%, in this case it is designated 25X1M1F (P2). When smelting steel with scrap-process, the content of Cu ≤ 0.30%. Tungsten is allowed up to 0.20%, titanium up to 0.030%. When smelting steel by the method of electroslag remelting, the mass fraction of sulfur should not be more than 0.015%.

Mechanical characteristics

Section, mm t отпуска, °C sT|s0,2, MPa σB, MPa d5, % y, % kJ/m2, кДж/м2 Brinell hardness number, MPa
Blank pieces of pipe fittings. Quenching in oil from 940-960 °C (exposure for 2.5-4.5 hours depending on the thickness and weight of the workpiece) with the following tempering in the air
≤150 640-660 675-785 ≥813 ≥16 ≥50 ≥600 269-311
Forgings. Quenching in oil from 860 °C to + Vacation at 515 °C, air cooling
≤250 - ≥780 ≥930 ≥10 ≥40 ≥490 285-321
Rolled steel. Quenching in oil with 910-920 °C + Vacation
- 540 ≥1220 ≥1270 ≥13 ≥58 - -
Rolled steel. Quenching in oil with 930-950 °C + Vacation at 620-660 °C
- - 790-1000 880-1050 16-19 60-64 - -
Normalization at 1000 °C, air cooling + Vacation at 650 °C, the cooling air (provided the temperature and duration of heat exposure)
- - ≥800 ≥970 ≥15 ≥52 - -
Blank pieces of pipe fittings. Quenching in oil from 940-960 °C (exposure for 2.5-4.5 hours depending on the thickness and weight of the workpiece) with the following tempering in the air
≤200 660-680 590-675 ≥735 ≥16 ≥50 ≥600 235-272
Forgings. Quenching in oil from 860 °C to + Vacation at 515 °C, air cooling
250-350 - ≥690 ≥860 ≥12 ≥45 ≥590 269-302
Rolled steel. Quenching in oil with 910-920 °C + Vacation
- 570 ≥1190 ≥1230 ≥16 ≥61 - -
Rolled steel. Quenching in oil with 930-950 °C + Vacation at 620-660 °C
- - ≥610 ≥710 ≥17 ≥68 - -
Normalization at 1000 °C, air cooling + Vacation at 650 °C, the cooling air (provided the temperature and duration of heat exposure)
- - ≥870 ≥980 ≥15 ≥60 - -
Forgings. Quenching in oil with 930-950 °C + Vacation at 620-660 °C, air cooling
20-180 - ≥665 ≥780 ≥16 ≥50 ≥590 -
Forgings. Quenching in oil from 860 °C to + Vacation at 515 °C, air cooling
350-450 - ≥590 ≥780 ≥14 ≥45 ≥590 241-277
Rolled steel. Quenching in oil with 910-920 °C + Vacation
- 600 ≥1150 ≥1190 ≥18 ≥61 - -
Rolled steel. Quenching in oil with 930-950 °C + Vacation at 620-660 °C
- - ≥590 ≥690 ≥17 ≥71 - -
Rolled steel. Quenching in oil from 950 °C to + Vacation at 620 °C (indicated by temperature and duration of heat exposure)
- - ≥940 ≥1110 ≥18 ≥61 - -
Bars hot rolled and forged (12-180 mm). Quenching in oil with 930-950 °C + vacation at 620-660 °C, air cooling
- ≥670 ≥780 ≥16 ≥50 ≥590 -
Rolled steel. Quenching in oil with 910-920 °C + Vacation
- 630 ≥1060 ≥1120 ≥19 ≥62 - -
Rolled steel. Quenching in oil with 930-950 °C + Vacation at 620-660 °C
- - ≥580 ≥620 ≥19 ≥75 - -
Rolled steel. Quenching in oil from 950 °C to + Vacation at 620 °C (indicated by temperature and duration of heat exposure)
- - ≥990 ≥1160 ≥17 ≥55 - -
Rolled steel. Quenching in oil with 880-900 °C + Vacation at 640-660 °C, air cooling
25 - ≥735 ≥880 ≥14 ≥50 ≥590 -
Rolled steel. Quenching in oil with 910-920 °C + Vacation
- 660 ≥880 ≥960 ≥19 ≥69 - -
Rolled steel. Quenching in oil with 930-950 °C + Vacation at 620-660 °C
- - ≥490 ≥550 ≥20 ≥78 - -
Rolled steel. Quenching in oil from 950 °C to + Vacation at 620 °C (indicated by temperature and duration of heat exposure)
- - ≥980 ≥1090 ≥18 ≥60 - -
Rolled steel. Normalizing at 1,000 °C + Vacation at 650 °C
- 810-870 940-980 ≥17 51-58 - -
Rolled steel. The annealing at 920 °C
- - ≥400 ≥540 ≥24 ≥75 - -
Rolled steel. Quenching in oil from 950 °C to + Vacation at 620 °C (indicated by temperature and duration of heat exposure)
- - ≥950 ≥1070 ≥17 ≥60 - -
Rolled steel. The annealing at 920 °C
- - ≥260 ≥380 ≥23 ≥79 - -
- - ≥240 ≥330 ≥24 ≥82 - -

Description mechanical marks

Name Description
Section Section
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σB Limit short-term strength
d5 Elongation after rupture
y The relative narrowing
kJ/m2 Toughness

Physical characteristics

Temperature Е, ГПа G, ГПа r, кг/м3 l, Вт/(м · °С) R, НОм · м a, 10-6 1/°С С, Дж/(кг · °С)
0 213 82 7840 - - - -
20 217 - 7840 - - - -
100 207 80 - 40 312 113 462
200 204 77 7790 39 396 117 -
300 194 75 - 38 475 128 462
400 187 71 7720 37 574 139 -
500 176 66 - 36 680 142 -
600 164 63 7650 35 826 142 -
800 - - - - - 144 -

A description of the physical symbols

Name Description
Е The normal elasticity modulus
G Modulus of elasticity shear torsion
r Density
l Coefficient of thermal conductivity
R UD. the resistivity

Technological properties

Name The value
Weldability Difficult weldability. Welding methods: RDS and ADS.
Propensity to temper brittleness tend not
Forging temperature Start - 1180 °C, the end - 850 °C. the cross Sections up to 60 mm are cooled in stacks in the air, 61-200 mm are subjected to low temperature annealing.
Flock-sensitive sensitivity Sensitive.
Workability by cutting In the normalized and tempered condition in NV ?300 Kn TV.SPL.=0,70 Kn b.St.=0,25.

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