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Characteristics for grade     25   ( 25 )

      Grade :     25   ( 25 )
      Substitute:   20, 30
      Classification :   High quality structural carbon steel
      Equivalent grades:   Go here



Chemical composition in % for grade   25   ( 25 )
C Si Mn Ni S P Cr Cu As
0.22 - 0.30.17 - 0.370.5 - 0.8max   0.3max   0.04max   0.035max   0.25max   0.3max   0.08


Temperature of critical points for grade   25   ( 25 ).
Ac1 = 735 ,      Ac3(Acm) = 835 ,       Ar3(Arcm) = 825 ,       Ar1 = 680


Mechanical properties under Т=20oС for grade   25   ( 25 )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Sheet heat-treatment, GOST 4041-71 4 - 14   390-540  26    
Bar cold-drawn , GOST 10702-78     540     50 Annealing
Rolled stock, GOST 1050-88 to 80   450 275 23 50 Normalizing
Rolled stock cold-worked , GOST 1050-88     540   7 40  
Rolled stock annealed , GOST 1050-88     410   19 50  
Band annealed , GOST 2284-79     340-590  18    
Band cold-worked , GOST 2284-79     540-880       


    Brinell hardness for     25   ( 25 )   ,     Sheet GOST 4041-71 HB 10 -1 = 138   MPa
    Brinell hardness for     25   ( 25 )   ,     Bar GOST 10702-78 HB 10 -1 = 156   MPa
    Brinell hardness for     25   ( 25 )   ,     Rolled stock GOST 1050-88 HB 10 -1 = 217   MPa
    Brinell hardness for     25   ( 25 )   ,     Rolled stock GOST 1050-88 HB 10 -1 = 170   MPa
    Brinell hardness for     25   ( 25 )   ,     Sheet trick GOST 1577-93 HB 10 -1 = 170   MPa


Technological properties for grade   25   ( 25 )
  Weldability: without limitations.
 Flakes : not predisposed
Temper brittleness: not predisposed


Physical properties for grade   25   ( 25 )
T E 10- 5 a 10 6 l r C R 10 9
Grade MPa 1/Grade Watt/(m·Grade) kg/m3 J/(kg·Grade) Ohm·m
20 1.98     7820   169
100 1.96 12.2 51   470 219
200 1.91 13 49   483 292
300 1.86 13.7 46     381
400 1.63 14.3 43   521 488
500   14.7 40   571 601
600   15 36     758
700   15.2 32     925
800     26      
T E 10- 5 a 10 6 l r C R 10 9


Equivalent steels for grade     25   ( 25 )
Warning! Indicated both exact and nearest equivalents.
USAGermanyJapanFranceEnglandEuropeanItalyBelgiumSpainChinaSwedenBulgariaHungaryPolandRomaniaCzechiaSouth Korea
-DIN,WNrJIS AFNORBSEN UNINBNUNEGBSSBDSMSZPNSTASCSNKS
1025
G10250
M1025
1.0406
1.1158
C25
C25E
C26D
Ck25
S25C
S28C
SWRCH25K
2C25
C25
C25E
FR28
XC25
070M26
1C25
C25
C25E
1.0406
1.1158
2C25
C25
C25E
C22E
C22R
C25
C25E
C25R
C25-2
C25E
C25k
F.1120
25
25Z
ML25
1450
25
C25E
C25E
20G
25
OLC25
OLC25q
OLC25X
12030
SM25C
SM28C


Specification :
Mechanical properties :
sв - Tensile strength , [MPa]
sT - Yield stress, [MPa]
d5 - Specific elongation at fracture , [ % ]
y - Reduction of area , [ % ]
KCU - Impact strength , [ kJ / m2]
HB - Brinell hardness , [MPa]

Physical properties :
T - Test temperature , [Grade]
E - Young modulus , [MPa]
a - Coefficient of linear expansion (range 20o - T ) , [1/Grade]
l - Termal (heat) condition coefficient , [Watt/(m·Grade)]
r - Density , [kg/m3]
C - Specific heat ( range 20o - T ), [J/(kg·Grade)]
R - Electrical resistance , [Ohm·m]

Weldability :
without limitations - welding is done without heating and subsequent heat treeting
limited weldability - welding is possible under heating up to 100-120 grade and subsequent heat treeting
hard weldability - obtaining the quality welding needs the additional operations:heating up to 200-300 grade; the heat treeting ia annealing

  25   ( 25 ) - High quality structural carbon steel: chemical composition, mechanical and physical properties, hardness
Database of steels and alloys (Marochnik) contains information about chemical composition and properties more then 3000 steels and alloys

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