Steel 38H2MYUA (38ХМЮА)

Designation

Name The value
Designation GOST Cyrillic 38Х2МЮА
Designation GOST Latin 38X2MJuA
Transliteration 38H2MYuA
By chemical elements 38Cr2MoAl
Name The value
Designation GOST Cyrillic 38ХМЮА
Designation GOST Latin 38XMJuA
Transliteration 38HMYuA
By chemical elements 38CrMoAl

Description

Steel 38H2MYUA used: for the manufacture of rods of valves of steam turbines, operating at temperatures up to +450 °C; cylinder liners of internal combustion engines of the injection needle, plates, books, sprays, fingers, plungers, camshaft rollers, gears, shafts, bushings and other parts; elements of rocket and aircraft engines; parts of pipelines with quenching in oil and tempering in oil or water; nitride parts aircraft; solid-rolled rings for different purposes.

Note

Structural steel high-quality homalomena molybdenum.
In the manufacture of steel 38H2MYUA often using a nitriding process.

Standards

Name Code Standards
Sheets and strips В23 GOST 103-2006
Bars and shapes В32 GOST 1051-73, GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, OST 1 92049-76, TU 14-1-2118-77, TU 14-1-2765-79, TU 14-1-658-73, TU 14-1-950-74, TU 14-1-3238-81, TU 14-11-245-88, TU 14-1-3238-2006, TU 14-1-1271-75, TU 14-136-367-2008
Bars and shapes В22 GOST 1133-71, GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Steel pipes and fittings to them В62 GOST 21729-76, GOST 23270-89, TU 14-3-1443-86, TU 14-3-675-78, TU 14-159-227-93
Classification, nomenclature and General rules В20 OST 1 90005-91
Blanks. Of the workpiece. Slabs В21 OST 14-13-75
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-4944-90, TU 14-1-564-73, TU 1-92-156-90
Processing of metals by pressure. Forgings В03 OST 5Р.9125-84, TU 0306.018-80, ST ЦКБА 010-2004
Thermal and thermochemical treatment of metals В04 ST ЦКБА 026-2005

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu Al V Ti Mo W
TU 14-1-2765-79 0.35-0.42 ≤0.012 ≤0.016 0.3-0.6 1.35-1.65 0.2-0.45 ≤0.3 Rest ≤0.25 0.7-1.1 ≤0.1 ≤0.03 0.15-0.25 ≤0.2
TU 14-1-950-74 0.35-0.42 ≤0.025 ≤0.025 0.3-0.6 1.35-1.65 0.2-0.45 ≤0.3 Rest ≤0.25 0.7-1.1 ≤0.05 ≤0.03 0.15-0.25 ≤0.2
GOST 4543-71 0.35-0.42 ≤0.025 ≤0.025 0.3-0.6 1.35-1.65 0.2-0.45 ≤0.3 Rest ≤0.3 0.7-1.1 ≤0.05 ≤0.03 0.15-0.25 ≤0.2
Fe is the basis.
GOST 4543-71 regulates the content of high-quality steel: P≤0,025%; S≤0.015%; Сu≤0.25%.
According to TU 14-1-2765-79, the chemical composition is given for steel grade 38Х2МЮА-Ш.
According to TU 14-1-950-86, the chemical composition is given for steel grade 38X2MUA.
According to TU 14-1-3238-81 for steel grade 38Х2МЮА-СШ (38ХМЮА-СШ) the content of S≤0,015%.

Mechanical properties

Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa HRC
Pipe seamless cold drawn, cold rolled and toplocatie, heat-treated in the delivery condition according to GOST 21729-76
- - ≥392 ≥20 - - - -
Rolled steel. Quenching in oil or water with 930-950 °C + Vacation at 640-680 °C, air cooling
100-200 - ≥590 ≥780 ≥10 ≥45 ≥590 - -
Rolled steel. Quenching in oil from 900 °C + Vacation
- 300 ≥1660 ≥1810 ≥8 ≥43 ≥390 ≥550 -
A sample with diameter 10 mm, length 50 mm, laminated and annealed. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
- - ≥98 ≥110 ≥66 ≥95 - - -
Rolled steel. Quenching in oil with 930-940 °C + Vacation at 660 °C (indicated by temperature and duration of heat exposure)
- - ≥640 ≥800 ≥20 ≥60 - - -
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
- - - - - - - 285-341 25-37
Blank pieces of pipe fittings according to ST CKBA 026-2005. Quenching in oil with 935-965 °C (exposure for 2.5-4.0 hours depending on thickness and weight of the workpiece) + Holiday cooling in water or oil
≤160 620-650 590 ≥735 ≥13 ≥40 ≥490 235-277 -
Rolled steel. Quenching in oil or water with 930-950 °C + Vacation at 640-680 °C, air cooling
20-60 - ≥880 ≥1030 ≥18 ≥52 - 250-300 -
Rolled steel. Quenching in oil from 900 °C + Vacation
- 400 ≥1520 ≥1670 ≥10 ≥39 ≥100 ≥500 -
A sample with diameter 10 mm, length 50 mm, laminated and annealed. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
- - ≥66 ≥84 ≥57 ≥97 - - -
Rolled steel. Quenching in oil with 930-940 °C + Vacation at 660 °C (indicated by temperature and duration of heat exposure)
- - ≥550 ≥710 ≥23 ≥63 - - -
Blank pieces of pipe fittings according to ST CKBA 026-2005. Quenching in oil with 935-965 °C (exposure for 2.5-4.0 hours depending on thickness and weight of the workpiece) + Holiday cooling in water or oil
≤40 620-650 835-880 ≥1078 ≥10 ≥35 ≥700 - 32.8-38.7
Rolled steel. Quenching in oil or water with 930-950 °C + Vacation at 640-680 °C, air cooling
60-100 - ≥730 ≥880 ≥10 ≥45 ≥590 - -
Rolled steel. Quenching in oil from 900 °C + Vacation
- 500 ≥1270 ≥1420 ≥10 ≥44 ≥290 ≥450 -
A sample with diameter 10 mm, length 50 mm, laminated and annealed. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
- - ≥39 ≥49 ≥66 ≥98 - - -
Ring forged in OST 1 92049-76. Quenching in warm water or oil with 930-950 °C + Vacation at 600-670 °C, cooling in oil or water
30 - ≥795 ≥930 ≥13 ≥42 ≥755 - -
Rolled steel. Quenching in oil from 940 °C to + Vacation at 600 °C (named place of clippings sample)
≤30 - ≥780 ≥910 ≥17 ≥52 ≥1150 - -
Rolled steel. Quenching in oil from 900 °C + Vacation
- 600 ≥1080 ≥1180 ≥12 ≥60 ≥780 ≥370 -
A sample with diameter 10 mm, length 50 mm, laminated and annealed. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
- - ≥22 ≥32 ≥77 ≥100 - - -
Forgings. Quenching in oil with 935-965 °C + Vacation at 660-680 °C
100-300 - ≥590 ≥735 ≥13 ≥40 ≥490 235-277 -
Rolled steel. Hardening through water in the oil from 940 °C to + Vacation at 600 °C (named place of clippings sample)
140-180 - ≥780 ≥930 ≥14 ≥48 ≥390 - -
A sample with diameter 10 mm, length 50 mm, laminated and annealed. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
- - ≥15 ≥22 ≥77 ≥100 - - -
Bars hot rolled, forged and calibrated. Quenching in oil from 930-950 °C + Vacation at 600-670 °C, cooling in oil or water
- ≥785 ≥930 ≥10 ≥40 ≥880 285-321 -
Rolled steel. Hardening through water in the oil from 940 °C to + Vacation at 600 °C (named place of clippings sample)
180-220 - ≥800 ≥930 ≥16 ≥43 ≥340 - -
Rolled steel. Quenching in oil with 930-940 °C + Vacation at 660 °C (maintained for 5 h) HB≥255
- - ≥650 ≥800 ≥17 ≥64 - - -
Bars hot rolled, forged and calibrated. Quenching in oil from 930-950 °C + Vacation at 600-670 °C, cooling in oil or water
- ≥785 ≥930 ≥15 ≥50 ≥1080 285-321 -
Rolled steel. Hardening through water in the oil from 940 °C to + Vacation at 600 °C (named place of clippings sample)
140-180 - ≥710 ≥860 ≥15 ≥47 ≥360 - -
Rolled steel. Quenching in oil with 930-940 °C + Vacation at 660 °C (maintained for 5 h) HB≥255
- - ≥580 ≥780 ≥17 ≥56 - - -
Bars hot rolled, forged and calibrated. Quenching in warm water (30-60 °C) from 930-950 °C + Vacation at 600-670 °C, cooling in oil or water
- ≥830 ≥980 ≥10 ≥40 ≥880 302-341 -
Rolled steel. Hardening through water in the oil from 940 °C to + Vacation at 600 °C (named place of clippings sample)
180-220 - ≥730 ≥880 ≥15 ≥43 ≥350 - -
Rolled steel. Quenching in oil with 930-940 °C + Vacation at 660 °C (maintained for 5 h) HB≥255
- - ≥570 ≥810 ≥18 ≥58 - - -
Bars hot rolled, forged and calibrated. Quenching in warm water (30-60 °C) from 930-950 °C + Vacation at 600-670 °C, cooling in oil or water
- ≥830 ≥980 ≥15 ≥50 ≥1080 302-341 -
Rolled steel. Hardening through water in the oil from 940 °C to + Vacation at 600 °C (named place of clippings sample)
30-50 - ≥830 ≥950 ≥16 ≥50 ≥1020 - -
Rolled steel. Quenching in oil with 930-940 °C + Vacation at 660 °C (maintained for 5 h) HB≥255
- - ≥550 ≥720 ≥20 ≥63 - - -
Bars and strip hot rolled and forged. Quenching in oil or warm water with 930-950 °C + Vacation at 600-670 °C, cooling in water or oil
- ≥835 ≥980 ≥15 ≥50 ≥883 302-341 -
Rolled steel. Hardening through water in the oil from 940 °C to + Vacation at 600 °C (named place of clippings sample)
50-80 - ≥830 ≥940 ≥15 ≥50 ≥480 - -
Rolled steel. Quenching in oil with 930-940 °C + Vacation at 660 °C (maintained for 5 h) HB≥255
- - ≥420 ≥470 ≥25 ≥81 - - -
Bars and strip hot rolled and forged. Quenching in oil or warm water with 930-950 °C + Vacation at 600-670 °C, cooling in oil
30 - ≥785 ≥932 ≥15 ≥50 ≥980 285-321 -
Rolled steel. Hardening through water in the oil from 940 °C to + Vacation at 600 °C (named place of clippings sample)
80-140 - ≥780 ≥920 ≥15 ≥48 ≥410 - -
Rolled steel. Quenching in oil with 930-940 °C + Vacation at 660 °C (maintained for 5 h) HB≥255
- - ≥270 ≥300 ≥26 ≥89 - - -
Bars and rods of steel treated in the ladle a synthetic slag in the delivery condition on the other 14-1-658-73. Samples of the cross
- - - ≥9 ≥33 ≥490 302-341 -
- - - ≥9 ≥33 ≥588 285-320 -
Rolled steel. Quenching in oil from 930 - 940 °C + Vacation at 660 °C (extract 5 h), air cooling
40-80 - ≥665 ≥825 ≥16.5 ≥64 - - -
Rolled steel. Quenching in oil from 950 °C to + Vacation at 550 °C, cooling in oil
80-120 - 780-880 930-1030 12-15 35-45 690-980 285-302 -
Seamless tubes for mechanical treatment according to GOST 23270-89 heat-treated. Quenching in oil or water with 925-955 °C + Vacation at 600-680 °C, cooling in oil or water
- - ≥980 ≥14 ≥50 ≥882 269-321 -

Description mechanical marks

Name Description
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d5 Elongation after rupture
y The relative narrowing
KCU Toughness
HB Brinell hardness number
HRC Rockwell hardness (indenter diamond spheroconical)

Physical characteristics

Temperature Е, HPa G, HPa r, kg/m3 l, W/(m · °C) a, 10-6 1/°C С, J/(kg · °C)
0 209 82 - 33 - -
20 209 - 7710 33 - -
100 202 79 - 33 115 496
200 194 76 - 32 118 517
300 190 75 - 31 127 533
400 181 71 - 20 134 546
500 174 67 - 20 139 575
600 162 62 - 28 147 609
700 147 57 - 27 149 638
800 137 53 - 27 149 638
1000 - - - - 123 676

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 Does not apply to welded structures.
Склонность к отпускной хрупкости Tend not.
The temperature of forging Start - 1240 °C, the end - of 800 °C. the cross Sections up to 50 mm are cooled in stacks in the air, 51-100 mm - in boxes.
Flock-sensitive sensitivity Sensitive.
Machinability In the hardened and tempered condition when NV 240-277 blower SB=780 MPa Kn TV.SPL.=A 0.75 Kn b.St.=0,55.