Steel 25KHGSA

Designation

Name The value
Designation GOST Cyrillic 25ХГСА
Designation GOST Latin 25XGCA
Transliteration 25HGSA
By chemical elements 25CrMnС

Description

25KHGSA steel is used: for the manufacture of hot rolled plates; responsible welded and stamped parts used in the improved condition (chassis screws, axles, shafts, worms, cranks, crankshafts, rods and other parts).

Note

Structural steel high-quality chromonemata.

Standards

Name Code Standards
Bars and shapes В32 GOST 1051-73, GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-1-1885-85, TU 14-1-2118-77, 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 14-1-5228-93, TU 14-136-367-2008
Sheets and strips В33 GOST 11268-76, GOST 11269-76, TU 14-1-1307-75, TU 14-1-1409-75, TU 14-1-1598-75, TU 14-1-4118-86, TU 14-1-4118-2004
Sheets and strips В23 GOST 82-70, GOST 103-2006
Bars and shapes В22 GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Classification, nomenclature and General rules В20 OST 1 90005-91
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-4944-90, TU 1-92-156-90

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
TU 14-1-1885-85 0.22-0.28 ≤0.015 ≤0.025 0.8-1.1 0.8-1.1 0.9-1.2 ≤0.3 Rest ≤0.25 - - - -
TU 14-1-4118-2004 0.22-0.28 ≤0.025 ≤0.025 0.8-1.1 0.8-1.1 0.9-1.2 ≤0.3 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%.
According to TU 14-1-3238-81 for steel grade 25ХГСА-СШ the content S≤0,015%.
According to TU 14-1-1885-85 the chemical composition is given for steel grade 25ХГСА-ВД. To ensure the required grain size, it is allowed to introduce vanadium in the steel smelting at the rate of its content in steel no more than 0.10%, the content of which in steel is not determined. The presence of tungsten to 0.20%, molybdenum to 0.15%, titanium to 0.030% is not a defect. The allowable variation in manganese content in steel is + 0.010 / -0.020%.

Mechanical properties

Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % d4 d10 y, % KCU, kJ/m2 HB, MPa HRC
Rolled steel. Quenching in oil from 890 °C to + Vacation at 600 °C, cooling in water (named place of clippings sample)
80-200 - ≥450 ≥700 ≥28 - - ≥67 - - -
Rod cross-section 20-70 mm. Quenching in oil from 890 °C to + vacation
- 300 ≥1320 ≥1510 ≥12 - - ≥57 ≥690 - ≥44
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
- - - 880-1080 - - - - - 262-311 27-34
Rolled steel. Quenching in oil from 890 °C to + Vacation at 600 °C, cooling in water (named place of clippings sample)
15-30 - ≥520 ≥690 ≥25 - - ≥67 - - -
Rod cross-section 20-70 mm. Quenching in oil from 890 °C to + vacation
- 400 ≥1200 ≥1270 ≥12 - - ≥59 ≥690 - ≥42
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
- - - 980-1180 - - - - - 285-341 30-37
Steel hot-rolled sheet (4-60 mm) 4-th and 5-th categories. Quenching in oil at 880±15 °C + Vacation at 470-550 °C, cooling in water or oil
- - ≥1030 ≥10 - - - ≥490 - -
Rolled steel. Quenching in oil from 890 °C to + Vacation at 600 °C, cooling in water (named place of clippings sample)
30-80 - ≥400 ≥630 ≥24 - - ≥67 - - -
Rod cross-section 20-70 mm. Quenching in oil from 890 °C to + vacation
- 500 ≥980 ≥1030 ≥17 - - ≥60 ≥1270 - ≥35
A sheet of thin (≤3.9 mm) hot - and cold-rolled. Quenching in oil at 880 °C + Vacation at 500-570 °C, cooling in water or oil
- - ≥1080 ≥10 - - - - - -
Rolled steel. Quenching in oil from 890 °C to + Vacation at 600 °C, cooling in water (named place of clippings sample)
80-200 - ≥390 ≥610 ≥30 - - ≥67 - - -
Rod cross-section 20-70 mm. Quenching in oil from 890 °C to + vacation
- 600 ≥730 ≥830 ≥20 - - ≥67 ≥1960 - ≥25
Flats on the other 14-1-4118-2004
- - 490-687 - ≥21 ≥17 - - - -
Rolled steel. Hardening through water in the oil from 890 °C to + vacation at 600 °C, okhlazhdeniem water (named place of clippings sample)
120-160 - ≥520 ≥710 ≥24 - - ≥67 - - -
Bars and strip hot rolled and forged. Quenching in oil with 880-900 °C + Vacation at 470-500 °C, cooling in water or oil
- ≥835 ≥1080 ≥10 - - ≥45 ≥590 311-363 -
Rolled steel. Hardening through water in the oil from 890 °C to + vacation at 600 °C, okhlazhdeniem water (named place of clippings sample)
160-200 - ≥510 ≥710 ≥25 - - ≥63 - - -
Rods made of steel 25KHGSA on the other 14-1-1885-85. Quenching in oil with 880-900 °C + Vacation at 470-500 °C, cooling in water or oil. In the graph KCU KCU values are shown along the fiber/KCU across the grain
Образец 15х15 - ≥835 ≥1080 ≥10 - - ≥45 ≥588/- 310-363 -
Rolled steel. Hardening through water in the oil from 890 °C to + vacation at 600 °C, okhlazhdeniem water (named place of clippings sample)
80-120 - ≥550 ≥720 ≥21 - - ≥67 - - -
Rolled steel. Quenching in oil from 890 °C to + Vacation at 600 °C, cooling in water
15-30 - ≥520 ≥690 ≥25 - - ≥67 ≥1795 - -
Rolled steel. Hardening through water in the oil from 890 °C to + vacation at 600 °C, okhlazhdeniem water (named place of clippings sample)
120-160 - ≥410 ≥640 ≥28 - - ≥68 - - -
Rolled steel. Quenching in oil from 890 °C to + Vacation at 600 °C, cooling in water
30-80 - ≥400 ≥630 ≥24 - - ≥67 ≥1825 - -
Rolled steel. Hardening through water in the oil from 890 °C to + vacation at 600 °C, okhlazhdeniem water (named place of clippings sample)
160-200 - ≥390 ≥630 ≥29 - - ≥66 - - -
30-50 - ≥560 ≥720 ≥26 - - ≥69 - - -
80-120 - ≥440 ≥660 ≥26 - - ≥67 - - -

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
d4 Elongation after rupture
d10 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 С, J/(kg · °C)
0 213 83 7850 35 306 - -
20 213 - 7850 35 306 - -
100 206 81 7830 36 338 122 496
200 194 76 7790 37 415 13 504
300 187 74 7760 37 501 136 512
400 175 68 7730 39 573 14 533
500 168 65 7690 34 660 142 554
600 163 63 7650 32 830 144 584
700 143 51 7610 31 1000 145 622
800 130 49 - 29 1100 145 622
1000 - - - - - 123 693

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
a The coefficient of linear expansion

Technological properties

Name The value
Weldability welded without any restrictions
Склонность к отпускной хрупкости inclined
The temperature of forging Start - 1180 °C, the end - 850 °C.
Flock-sensitive sensitivity sensitive
Machinability After hardening, tempering blower SB=780-900 MPa Kn NV 228-262 TV.SPL.=0.8, Kn b.St.=0.72
Macrostructure and pollution Macrostructure of steel when testing for the breaks in the longitudinal direction and transverse templeto selected from rolled, should not have shrinkage, porosity, bubbles, cracks, delamination, inclusions and placenow and defects of fracture, listed in Annex 3 GOST 10243. The Central porosity, point heterogeneity and phase separation in the square should not exceed 1 points; layer-by-layer crystallization and the bright loop - 3 points reference scales GOST 10243. All other defects under GOST 10243, are not allowed. Pollution steel non-metallic inclusions should be according to the average score is not higher (in points): oxides of point 1,5, 2,0 stroke oxides, silicates fragile 1,0, 1,0 silicates plastic, silicates, non-deformed 2,5, 2,5 sulfides, nitrides stroke and point 1,0.