Steel 38KHGN

Designation

Name The value
Designation GOST Cyrillic 38ХГН
Designation GOST Latin 38XGH
Transliteration 38HGN
By chemical elements 38CrMnН

Description

38KHGN steel is used: for the manufacture of parts of excavators, fasteners, shafts, axles, gears, earrings and other critical parts, which are requirements of high strength.

Note

Structural steel quality homomasculinity.

Standards

Name Code Standards
Sheets and strips В23 GOST 103-2006
Bars and shapes В32 GOST 1051-73, GOST 4543-71, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-1-2118-77, TU 14-11-245-88, 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, 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
GOST 4543-71 0.35-0.43 ≤0.035 ≤0.035 0.8-1.1 0.5-0.8 0.17-0.37 0.7-1 Rest ≤0.3 ≤0.05 ≤0.03 ≤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%.

Mechanical properties

Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa HRC
Quenching in oil from 850 °C + vacation
- 200 1580 1780 15 36 275 499 -
- 300 1470 1670 16 40 186 478 -
- 400 1290 1370 16 41 461 415 -
- 500 1150 1200 16 46 765 350 -
- 600 950 1040 19 54 1540 269 -
Quenching in oil from 850 °C + vacation at 570 °C, cooling in water or oil
≤25 - 685 780 12 45 961 - -
Quenching in water or oil from 850 °C + vacation at 560 °C, cooling in water or oil (named place of clippings sample)
250 - 660 810 16 51 628 255 -
Quenching + tempering (forgings)
300-500 - 315 570 12 30 - 167-207 -
A specimen of 10 mm diameter, 50 mm length, forged and annealed. The rate of deformation of 5 mm/min strain rate of 0.002 1/s.
- - 185 200 34 93 - - -
Quenching in oil with 850-870 °C + vacation at 180-200 °C, air cooling
25-40 - 1340 1470 7 30 - - 50-53
Quenching in water or oil from 850 °C + vacation at 560 °C, cooling in water or oil (named place of clippings sample)
350 - 660 800 16 50 530 255 -
Quenching + tempering (forgings)
300-500 - 345 590 14 38 - 174-217 -
A specimen of 10 mm diameter, 50 mm length, forged and annealed. The rate of deformation of 5 mm/min strain rate of 0.002 1/s.
- - 89 135 57 98 - - -
Quenching in oil with 850-870 °C + vacation at 650 °C, air cooling
50-100 - 690 880 - 60 - 241 -
Quenching in water or oil from 850 °C + vacation at 560 °C, cooling in water or oil (named place of clippings sample)
450 - 690 840 15 47 481 248 -
Quenching + tempering (forgings)
500-800 - 345 590 12 33 - 174-217 -
A specimen of 10 mm diameter, 50 mm length, forged and annealed. The rate of deformation of 5 mm/min strain rate of 0.002 1/s.
- - 52 76 68 100 - - -
Quenching in water or oil from 850 °C + vacation at 560 °C, cooling in water or oil (named place of clippings sample)
250 - 700 850 15 54 677 269 -
Quenching + tempering (forgings)
100-300 - 395 615 15 40 - 187-229 -
A specimen of 10 mm diameter, 50 mm length, forged and annealed. The rate of deformation of 5 mm/min strain rate of 0.002 1/s.
- - 27 50 75 100 - - -
Quenching in water or oil from 850 °C + vacation at 560 °C, cooling in water or oil (named place of clippings sample)
350 - 730 840 17 59 814 262 -
Quenching + tempering (forgings)
300-500 - 395 615 13 35 - 187-229 -
A specimen of 10 mm diameter, 50 mm length, forged and annealed. The rate of deformation of 5 mm/min strain rate of 0.002 1/s.
- - 18 35 66 100 - - -
Quenching in water or oil from 850 °C + vacation at 560 °C, cooling in water or oil (named place of clippings sample)
450 - 730 890 15 54 716 262 -
Quenching + tempering (forgings)
500-800 - 395 615 11 30 - 187-229 -
A specimen of 10 mm diameter, 50 mm length, forged and annealed. The rate of deformation of 5 mm/min strain rate of 0.002 1/s.
- - 10 20 66 100 - - -
Quenching in water or oil from 850 °C + vacation at 560 °C, cooling in water or oil (named place of clippings sample)
250 - 700 860 17 48 579 241 -
Quenching + tempering (forgings)
≤100 - 440 635 16 45 - 197-235 -
Quenching in water or oil from 850 °C + vacation at 560 °C, cooling in water or oil (named place of clippings sample)
350 - 690 870 14 43 481 248 -
Quenching + tempering (forgings)
300-500 - 440 635 13 35 - 197-235 -
Quenching in water or oil from 850 °C + vacation at 560 °C, cooling in water or oil (named place of clippings sample)
450 - 590 810 15 32 343 235 -
Quenching + tempering (forgings)
≤100 - 490 655 16 45 - 212-248 -
Quenching using water in oil from 850 °C + vacation at 560 °C (10 h exposure), cooling in water (named place of clippings sample)
550 - 660 870 14 52 530 275 -
Quenching + tempering (forgings)
100-300 - 490 655 13 40 - 212-248 -
Quenching using water in oil from 850 °C + vacation at 560 °C (10 h exposure), cooling in water (named place of clippings sample)
550 - 800 930 16 52 677 275 -
Quenching + tempering (forgings)
≤100 - 540 685 15 45 - 223-262 -
Quenching using water in oil from 850 °C + vacation at 560 °C (10 h exposure), cooling in water (named place of clippings sample)
550 - 490 730 15 30 589 229 -
Quenching + tempering (forgings)
100-300 - 540 685 13 40 - 223-262 -
≤100 - 590 735 14 45 - 235-277 -
Normalization (forgings)
500-800 - 315 570 11 30 - 167-207 -
≤100 - 345 590 18 45 - 174-217 -

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)

Technological properties

Name The value
Weldability difficult weldability. Method of welding: SMAW. Necessary preheating and subsequent heat treatment.
Склонность к отпускной хрупкости inclined
The temperature of forging Start - 1200 °C, the end - of 800 °C. the cross Sections up to 250 mm are cooled in air, 251-350 mm - in the pit.
Flock-sensitive sensitivity sensitive