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Steel 12MKH

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 12МХ
Designation GOST Latin 12MX
Transliteration 12MH
The chemical elements 12MoCr

Description

12MKH steel is used: for the manufacture of superheater pipes, pipelines and collector installations high pressure; forgings of parts for steam boilers and steam pipes; parts, cylinders of gas turbines; various parts operating at temperatures up to +510 °C; as a base layer in the manufacture of hot-rolled dual-layer corrosion-resistant sheets.

Note

Steel pearlitic class.
Temperature intense scaling +570 °C.

Standards

Name Code Standards
Sectional and shaped rolling В22 GOST 1133-71, GOST 2590-2006, GOST 2591-2006
Sheets and stripes В23 GOST 19903-74, GOST 103-2006, GOST 19903-90
Sheets and stripes В33 GOST 4405-75, GOST 10885-85, TU 108.1263-84, TU 14-1-642-73, TU 24-10-003-70, TU 14-1-5093-92
Pipes steel and connecting parts to them В62 GOST 550-75, TU 14-3-463-2005
Sectional and shaped rolling В32 GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST 20072-74, TU 14-11-245-88
Metal forming. Forgings В03 OST 5Р.9125-84, TU 0306.018-80
Bulls. Blanks. Slabs В31 TU 14-1-1263-75

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
GOST 20072-74 0.09-0.16 ≤0.025 ≤0.03 0.4-0.7 0.4-0.7 0.17-0.37 ≤0.3 The rest ≤0.2 ≤0.05 ≤0.03 0.4-0.6 ≤0.2
Fe is the basis.
According to GOST 20072-74, when steel is scrap-process, the content of Cu ≤ 0.30%. Tungsten is allowed up to 0.20%, vanadium up to 0.050%, 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%.
According to TU 108.1263-84, steel should be smelted in an open-hearth furnace or an electric arc furnace. It is permitted to process steel at the OSRP.

Mechanical characteristics

Section, mm sT|s0,2, MPa σB, MPa d5, % y, % kJ/m2, кДж/м2 Brinell hardness number, MPa
Steel hot-rolled sheet, heat treated in the delivery condition (transverse specimens)
5-25 ≥235 ≥440 ≥24 - ≥579 -
Leaves section 20-160 mm
130-160 ≥195 ≥340 ≥18 ≥32 ≥490 -
Pipe with a diameter of 273 mm with a wall thickness of 28 mm. Normalizing at 920 °C, air cooling + Vacation at 680-690 °C, air cooling
- ≥280 ≥445 ≥32 ≥67 - -
Sheet double layer in the delivery state according to GOST 10885-85 (samples transverse)
12-40 ≥221 ≥420 ≥24 - ≥588 -
Leaves section 20-160 mm
130-160 ≥215 ≥390 ≥18 ≥32 ≥490 -
Pipe with a diameter of 273 mm with a wall thickness of 28 mm. Normalizing at 920 °C, air cooling + Vacation at 680-690 °C, air cooling
- ≥250 ≥450 ≥20 ≥62 - -
Sheet. Quenching in water from 900-920 °C + Vacation at 670-720 °C, air cooling (samples transverse)
4-60 ≥235 ≥440 ≥24 - ≥579 ≥182
Leaves section 20-160 mm
60-130 ≥215 ≥390 ≥18 ≥32 ≥490 -
Pipe with a diameter of 273 mm with a wall thickness of 28 mm. Normalizing at 920 °C, air cooling + Vacation at 680-690 °C, air cooling
- ≥290 ≥480 ≥20 ≥57 - -
Sheet. Quenching in water from 900-920 °C + Vacation at 670-720 °C, air cooling (samples transverse)
61-125 ≥235 ≥440 ≥18 ≥32 ≥481 -
Leaves section 20-160 mm
60-130 ≥235 ≥440 ≥18 ≥32 ≥490 -
Pipe with a diameter of 273 mm with a wall thickness of 28 mm. Normalizing at 920 °C, air cooling + Vacation at 680-690 °C, air cooling
- ≥250 ≥450 ≥23 ≥62 - -
Forgings for parts resistant to the ICC. Normalization at 910-930 °C, air cooling + Vacation at 670-690 °C, air cooling
≥235 ≥412 ≥21 ≥45 ≥579 -
Leaves section 20-160 mm
20-39 ≥235 ≥440 ≥19 ≥35 ≥490 -
Pipe with a diameter of 273 mm with a wall thickness of 28 mm. Normalizing at 920 °C, air cooling + Vacation at 680-690 °C, air cooling
- ≥235 ≥400 ≥22 ≥62 - -
Rolled steel. Normalization at 910-930 °C, air cooling + Vacation at 670-690 °C, air cooling
≤90 ≥235 ≥410 ≥21 ≥45 ≥579 -
Leaves section 20-160 mm
40-60 ≥235 ≥440 ≥19 ≥35 ≥490 -
Pipe with a diameter of 273 mm with a wall thickness of 28 mm. Normalizing at 920 °C, air cooling + Vacation at 680-690 °C, air cooling
- ≥220 ≥360 ≥22 ≥64 - -
The tubular billet (D = 80-270 mm) as supplied on THAT 14-1-1263-75. Normalization at 910-930 °C, air cooling
20-25 ≥206 ≥412 ≥21 ≥50 ≥686 -
Leaves section 20-160 mm
20-39 ≥235 ≥390 ≥19 ≥35 ≥490 -
Pipe with a diameter of 273 mm with a wall thickness of 28 mm. Normalizing at 920 °C, air cooling + Vacation at 680-690 °C, air cooling
- ≥220 ≥310 ≥26 ≥64 - -
The tubular billet (D = 80-270 mm) as supplied on THAT 14-1-1263-75. Vacation at 670-700 °C, air cooling
20-25 ≥206 ≥412 ≥19 ≥45 ≥490 -
Leaves section 20-160 mm
40-60 ≥235 ≥390 ≥19 ≥35 ≥490 -
Seamless hot deformed tubes, heat-treated in the delivery condition according to GOST 550-75
≥245 ≥410 ≥21 ≥45 ≥690 ≤156
Leaves section 20-160 mm
130-160 ≥295 ≥440 ≥20 ≥50 ≥780 -
40-130 ≥340 ≥490 ≥20 ≥50 ≥780 -

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 r, кг/м3 l, Вт/(м · °С) R, НОм · м a, 10-6 1/°С С, Дж/(кг · °С)
0 212 7850 - - - -
100 206 7830 50 240 112 473
200 200 7800 50 330 125 519
300 195 7760 50 410 127 565
400 189 7730 49 540 129 594
500 179 7690 47 640 132 653
600 170 7650 46 740 - 733
700 160 7610 44 900 135 -
900 - - - - 138 -
800 - - - - - 888
1000 - - - - - 1365

A description of the physical symbols

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

Technological properties

Name The value
Weldability Welded without any restrictions. Welding methods: SMAW, ADS under gas protection, the CCC. Recommended heating and subsequent heat treatment.
Propensity to temper brittleness Tend not.
Forging temperature Start - 1260 °C, the end - 750 °C.
Flock-sensitive sensitivity Sensitive.
Workability by cutting In the normalized and tempered condition, when blower SB 138 HB=460 MPa Kn b.St.=1.4.

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