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Characteristics for grade     40   ( 40 )

      Grade :     40   ( 40 )
      Substitute:   35, 45, 40г
      Classification :   High quality structural carbon steel
      Equivalent grades:   Go here



Chemical composition in % for grade   40   ( 40 )
C Si Mn Ni S P Cr Cu As
0.37 - 0.450.17 - 0.370.5 - 0.8max   0.3max   0.04max   0.035max   0.25max   0.3max   0.08


Temperature of critical points for grade   40   ( 40 ).
Ac1 = 724 ,      Ac3(Acm) = 790 ,       Ar3(Arcm) = 760 ,       Ar1 = 680


Mechanical properties under Т=20oС for grade   40   ( 40 )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Sheet heat-treatment, GOST 4041-71 4 - 14   510-660  21    
Pipe cold-rolled     580 320 17   Normalizing
Pipe hotrolled     600 340 16    
Bar cold-drawn , GOST 10702-78     590     40 Annealing
Rolled stock annealed , GOST 1050-88     510   14 40  
Rolled stock cold-worked , GOST 1050-88     610   6 35  
Rolled stock, GOST 1050-88 to 80   570 335 19 45 Normalizing
Band cold-worked , GOST 2284-79     690-1030       
Band annealed , GOST 2284-79     440-690  14    
Strip, GOST 1577-93 6 - 60   570 335 19 45 Normalizing


    Brinell hardness for     40   ( 40 )   ,     Sheet GOST 4041-71 HB 10 -1 = 167   MPa
    Brinell hardness for     40   ( 40 )   ,     Rolled stock GOST 1050-88 HB 10 -1 = 241   MPa
    Brinell hardness for     40   ( 40 )   ,     Rolled stock GOST 1050-88 HB 10 -1 = 217   MPa
    Brinell hardness for     40   ( 40 )   ,     Rolled stock GOST 1050-88 HB 10 -1 = 197   MPa
    Brinell hardness for     40   ( 40 )   ,     Rolled stock GOST 1050-88 HB 10 -1 = 187   MPa


Technological properties for grade   40   ( 40 )
  Weldability: limited weldability.
 Flakes : not predisposed
Temper brittleness: not predisposed


Physical properties for grade   40   ( 40 )
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 2.13   51.5 7850 483 160
100 2.1 11.9 50.6   486 221
200 1.98 12.7 48.1   497 296
300 1.9 13.5 45.6   512 387
400 1.85 14.05 41.9   529 493
500 1.79 14.5 38.1   550 619
600 1.67 14.9 33.5   574 766
700 1.6 15.15 30   628 932
800   12.5 24.8   674 1110
900   13.5 25.7   657 1150
1000   14.5 26.9   653 1180
1100   15.2 28   649 1207
1200   15.8 29.5   649 1230
T E 10- 5 a 10 6 l r C R 10 9


Equivalent steels for grade     40   ( 40 )
Warning! Indicated both exact and nearest equivalents.
USAGermanyJapanFranceEnglandEuropeanItalyBelgiumSpainChinaSwedenBulgariaHungaryPolandRomaniaCzechiaAustraliaSouth Korea
-DIN,WNrJIS AFNORBSEN UNINBNUNEGBSSBDSMSZPNSTASCSNASKS
1040
1042
G10400
G10420
1.0511
1.1186
C40
C40E
C40R
C42D
Ck35
Ck40
Cm40
S40C
S43C
SWRCH38K
SWRCH40K
2C40
C40E
FR38
XC3841
XC38H1
XC42
XC42H1
XP42HI
060A40
080A40
080M40
C40
C40E
CS40
1.0501
1.0511
1.1186
C35
C40
C40E
C40
C40E
C40R
C40-2
C40E
40
ML40
1555
1650
40
C40E
C40E
40
40A
40rs
D40
P40
OLC40
OLC40X
12041
1040
M1040
SM40C

Types of delivery of grade   40   ( 40 )
B03 - Metal forming treatment. Forgings
В22 - Graded and shaped rolling
B23 - Sheets and Strips
B24 - Ribbons
В32 - Graded and shaped rolling
B33 - Sheets and Strips
B34 - Ribbons
В62 - Steel pipes and connecting parts to them
В71 - Low-carbon steel wire
В72 - Medium-high and high-carbon steel wire


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

  40   ( 40 ) - 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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