Steel 38KHA

Designation

Name The value
Designation GOST Cyrillic 38ХА
Designation GOST Latin 38XA
Transliteration 38HA
By chemical elements 38Cr

Description

38KHA steel is used: for the manufacture of hot rolled plates; worms and worm pairs of parts, gears, pinions, shafts, axles, critical bolts, special fasteners and other upgradable parts, rolled rings for different purposes.

Note

Structural steel high quality chrome.

Standards

Name Code Standards
Bars and shapes В32 GOST 1051-73, GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 10702-78, GOST 14955-77, OST 1 92049-76, TU 3-1053-86, TU 14-1-2118-77, TU 14-1-2765-79, TU 14-1-2995-80, TU 14-1-950-74, TU 14-1-3238-81, TU 14-11-245-88, TU 14-1-1271-75, TU 14-1-5228-93, TU 14-136-367-2008
Bars and shapes В22 GOST 1133-71, GOST 8278-83, GOST 8281-80, GOST 8282-83, GOST 8283-93, GOST 8319.0-75, GOST 9234-74, GOST 11474-76, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Sheets and strips В33 GOST 1577-93, TU 14-1-1409-75, TU 14-1-4118-86, TU 14-1-4118-2004
Steel pipes and fittings to them В62 GOST 21729-76, TU 14-3-675-78, TU 14-3Р-50-2001
Sheets and strips В23 GOST 82-70, GOST 19903-74, GOST 103-2006, GOST 19903-90
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 14-1-4992-91, TU 1-92-156-90
Steel cylinders В66 TU 14-3-246-74
Processing of metals by pressure. Forgings В03 TU 14-3-286-74

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
TU 14-1-2765-79 0.35-0.42 ≤0.015 ≤0.025 0.5-0.8 0.8-1.1 0.17-0.37 ≤0.3 Rest ≤0.25 ≤0.05 ≤0.03 ≤0.15 ≤0.2
TU 14-1-950-74 0.35-0.42 ≤0.025 ≤0.025 0.5-0.8 0.8-1.1 0.17-0.37 ≤0.3 Rest ≤0.25 ≤0.05 ≤0.03 ≤0.15 ≤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 38ХА-Ш.
According to TU 14-1-3238-81 for steel grade 38XA-C, 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
Hot-rolled steel and hot rolled with special surface finish
- - - - - - ≤187 -
Steel calibrated and calibrated with special surface finish
- - - - - - ≤207 -
- - ≤590 - ≥60 - ≤207 -
- - ≤560 - ≥60 - ≤207 -
Pipe seamless cold drawn, cold rolled and toplocatie, heat-treated in the delivery condition according to GOST 21729-76
- - ≥588 ≥14 - - - -
Forgings. Quenching in oil from 850 °C + vacation at 560 °C, air cooling
100 - ≥540 ≥690 ≥15 ≥45 ≥590 240-280 -
Rolled steel. Hardening in water from 850 °C + Vacation
- 400 ≥1220 ≥1310 ≥7 ≥38 - ≥380 -
A rod with a diameter of 25 mm. Quenching in oil from 860 °C to + Vacation at 550 °C
- - ≥900 ≥1040 ≥18 ≥58 - - -
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
- - - 880-1080 - - - 262-311 27-34
Forgings. Quenching in oil from 850 °C + vacation at 560 °C, air cooling
100-200 - ≥490 ≥660 ≥13 ≥40 ≥540 230-270 -
Rolled steel. Hardening in water from 850 °C + Vacation
- 500 ≥930 ≥1030 ≥12 ≥47 - ≥320 -
A rod with a diameter of 25 mm. Quenching in oil from 860 °C to + Vacation at 550 °C
- - ≥930 ≥1100 ≥18 ≥55 - - -
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
- - - 1080-1270 - - - 311-363 34-39
Ring forged in OST 1 92049-76. Quenching in oil with 845-875 °C + Vacation at 500-590 °C, cooling in water or oil
25 - ≥745 ≥880 ≥9 ≥40 ≥657 - -
Forgings. Quenching in oil from 850 °C + vacation at 560 °C, air cooling
200-300 - ≥440 ≥640 ≥14 ≥40 ≥540 230-260 -
Rolled steel. Hardening in water from 850 °C + Vacation
- 600 ≥710 ≥830 ≥17 ≥63 - ≥260 -
A rod with a diameter of 25 mm. Quenching in oil from 860 °C to + Vacation at 550 °C
- - ≥1000 ≥1120 ≥18 ≥55 - - -
Bars hot rolled, forged and calibrated. Quenching in oil with 845-875 °C + Vacation, cooling in water or oil
500-550 ≥785 ≥930 ≥12 ≥50 ≥980 285-341 -
A rod with a diameter 28-55 mm Quenching in oil from 830 °C to + Vacation at 680 °C (extract 3 hours)
- - ≥570 ≥700 ≥26 ≥60 - 207-217 -
Bars hot rolled, forged and calibrated. Quenching in oil with 845-875 °C + Vacation, cooling in water or oil
560-590 ≥785 ≥880 ≥12 ≥50 ≥880 262-311 -
A rod with a diameter 28-55 mm Quenching in oil from 830 °C to + Vacation at 680 °C (extract 3 hours)
- - ≥430 ≥590 ≥19 ≥71 - - -
- - ≥360 ≥420 ≥24 ≥79 - - -
- - ≥210 ≥245 ≥32 ≥89 - - -
A rod with a diameter 28-55 mm Quenching in oil from 850 °C + Vacation at 550 °C (extract 3 hours)
- - ≥790 ≥940 ≥13 ≥55 - 285-302 -
- - ≥680 ≥880 ≥17 ≥58 - - -
- - ≥610 ≥690 ≥18 ≥68 - - -
- - ≥430 ≥490 ≥21 ≥80 - - -

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) R, Mr. · m a, 10-6 1/°C
0 196 83 7850 - 290 -
20 196 - 7850 - 290 -
200 - - 7800 46 - 131
600 - - 7650 35 - 142
100 - - - 50 - 127
300 - - - 42 - 135
400 - - - 40 - 138
500 - - - 37 - 142
700 - - - 31 - -
800 - - - - - 146

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, it is recommended that fusion welding with preheating and subsequent heat treatment.
Склонность к отпускной хрупкости inclined
The temperature of forging Start - 1240 °C, the end - 780 °C.
Flock-sensitive sensitivity sensitive
Machinability blower SB=930 MPa Kn TV.SPL.=0.7 Kn b.St.=0.8