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Characteristics for grade     20K   ( 20К )

      Grade :     20K   ( 20К )
      Substitute:   15К
      Classification :   High quality structural carbon steel
      Equivalent grades:   Go here



Chemical composition in % for grade   20K   ( 20К )
C Si Mn Ni S P Cr Cu As
0.16 - 0.240.15 - 0.30.35 - 0.65max   0.3max   0.04max   0.04max   0.3max   0.3max   0.08


Temperature of critical points for grade   20K   ( 20К ).
Ac1 = 724 ,      Ac3(Acm) = 845 ,       Ar3(Arcm) = 817 ,       Ar1 = 682


Mechanical properties under Т=20oС for grade   20K   ( 20К )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Sheet, GOST 5520-79     400-510225-24523-25 490-590 


Technological properties for grade   20K   ( 20К )
  Weldability: without limitations.
 Flakes : not predisposed
Temper brittleness: not predisposed


Physical properties for grade   20K   ( 20К )
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 2.11     7870 482 200
100 2.08   51 7840 486 219
200 2.05 12 49 7810 498 292
300 2 12.8 46 7780 514 381
400 1.91 13.2 42 7740 533 487
500 1.8 13.6 39 7710 555 601
600 1.65 13.85 36 7670 584 758
700       7630 636 925
800       7640 703 1094
900       7610 703 1135
1000       7550 695 1167
1100       7490 691 1194
1200         687 1219
T E 10- 5 a 10 6 l r C R 10 9


Equivalent steels for grade     20K   ( 20К )
Warning! Indicated both exact and nearest equivalents.
USAGermanyJapanFranceEnglandEuropeanItalyBelgiumSpainSwedenBulgariaHungaryPolandRomaniaCzechiaAustriaSouth Korea
-DIN,WNrJIS AFNORBSEN UNINBNUNESSBDSMSZPNSTASCSNONORMKS
Gr.60
K01701
K02401
K02402
K02505
K02801
X42
1.0426
ASt41
H3
H4
P265GH
St45-8
SG295
SGV410
SGV450
SGV480
SM53B
SM53C
SPV235
SPV315
A42AP
A42CP
A42F
P265GH
1501Gr.164-360
151-400
161-430
164-360
400-22
P265GH
1.0425
P265GH
Fe4102KG
Fe4102KW
Fe410KW
P265GH
D42-2
A42RCI
A42RCII
1430
1431
1432
16K
P265GH
KL2C
P265GH
St3M
St41K
K410
OL44.3
11416
11418
11431
St41KW
SPPV315
SPPV355

Types of delivery of grade   20K   ( 20К )
B23 - Sheets and Strips
B33 - Sheets and Strips


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

  20K   ( 20К ) - 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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