Steel 30KHGT

Designation

Name The value
Designation GOST Cyrillic 30ХГТ
Designation GOST Latin 30XGT
Transliteration 30HGT
By chemical elements 30CrMnTi

Description

30KHGT steel is used: for the manufacture of improved and cemented parts which require high strength and toughness of core and high surface hardness and operating at high speeds and high unit pressures under the action of shock loads.

Note

Structural steel quality chromatorgraphy.

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, TU 14-1-5414-2001, TU 14-1-2118-77, TU 14-1-707-73, TU 14-1-3238-81, TU 14-11-245-88, TU 14-1-5228-93, 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
Processing of metals by pressure. Forgings В03 GOST 8479-70, OST 5Р.9125-84, ST ЦКБА 010-2004
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-4944-90

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
TU 14-1-3238-81 0.24-0.32 ≤0.03 ≤0.03 0.8-1.1 1-1.3 0.17-0.37 ≤0.3 Rest ≤0.3 ≤0.05 0.03-0.099 ≤0.15 ≤0.2
GOST 4543-71 0.24-0.32 ≤0.035 ≤0.035 0.8-1.1 1-1.3 0.17-0.37 ≤0.3 Rest ≤0.3 ≤0.05 0.03-0.09 ≤0.15 ≤0.2
Fe is the basis.
According to GOST 4543-71 the content in high-quality steel is regulated: P≤0,025%; S≤0.025%; Сu≤0.30%; in high-grade steel: P≤0,025%; S≤0.015%; Сu≤0.25%.
According to TU 14-1-3238-81 the chemical composition for steel grade 30ХГТА is given.

Mechanical properties

Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa HRC
Normalization at 880-950 °C + Quenching in oil from 850 °C + Vacation at 200 °C, cooling in water or oil
Образец для м/и - ≥1270 ≥1470 ≥9 ≥40 ≥579 - -
Rolled steel. Quenching in oil from 850 °C + Vacation at 200 °C, air cooling
15-20 - ≥930 ≥1180 ≥14 ≥50 - - ≥38
Rolled steel. Quenching in oil from 850 °C + Vacation (longitudinal samples)
- 200 ≥1420 ≥1680 ≥10 ≥53 - - ≥50
Forgings. Quenching in oil from 850 °C + Vacation at 200 °C, air cooling
100 - ≥685 ≥835 ≥13 ≥42 ≥579 262-311 -
Rolled steel. Quenching in oil from 850 °C + Vacation at 200 °C, air cooling
20-25 - ≥830 ≥1130 ≥17 ≥45 - - ≥34
Rolled steel. Quenching in oil from 850 °C + Vacation (longitudinal samples)
- 300 ≥1270 ≥1520 ≥9 ≥52 - - ≥48
Forgings. Cementation at 920-950 °C, air cooling + Tempering in oil 840-860 °C + Vacation at 180-200 °C, air cooling
100-150 - ≥690 ≥830 ≥12 ≥30 ≥481 ≥240 57-63
Rolled steel. Quenching in oil from 850 °C + Vacation at 200 °C, air cooling
5-15 - ≥1180 ≥1420 ≥13 ≥50 - - ≥45
Rolled steel. Quenching in oil from 850 °C + Vacation (longitudinal samples)
- 400 ≥1180 ≥1370 ≥8 ≥55 - - ≥44
Forgings. Cementation at 920-950 °C, air cooling + Tempering in oil 840-860 °C + Vacation at 180-200 °C, air cooling
60-100 - ≥730 ≥880 ≥12 ≥35 ≥579 ≥270 57-63
Rolled steel. Quenching in oil from 850 °C + Vacation at 200 °C, air cooling
5 - ≥1420 ≥1620 ≥12 ≥50 - - -
Rolled steel. Quenching in oil from 850 °C + Vacation (longitudinal samples)
- 500 ≥980 ≥1080 ≥11 ≥59 - - ≥38
Forgings. Cementation at 920-950 °C, air cooling + Tempering in oil 840-860 °C + Vacation at 180-200 °C, air cooling
60 - ≥780 ≥1080 ≥12 ≥35 ≥579 ≥300 57-63
Rolled steel. Quenching in oil from 850 °C + Vacation (longitudinal samples)
- 600 ≥760 ≥930 ≥19 ≥65 - - ≥32

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 l, W/(m · °C) a, 10-6 1/°C С, J/(kg · °C)
20 212 83 36 - -
100 202 79 37 105 495
200 195 76 36 12 508
300 189 74 34 127 525
400 174 67 33 133 537
500 169 66 31 138 567
600 157 61 29 138 588
700 138 53 28 - 626
800 132 51 28 14 626
1000 - - - - 705

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 Limited weldability. Welding methods: SMAW, CCC. Recommended heating and subsequent heat treatment.
Склонность к отпускной хрупкости inclined
The temperature of forging Beginning - 1220 °C, the end - of 800 °C. the cross Sections up to 200 mm are cooled in the ash of more than 200 mm in the furnace.
Flock-sensitive sensitivity not sensitive.
Machinability After normalization with HB 364 and blower SB=860 MPa Kn TV.SPL.=0,45 Kn b.St.=0,25.