St20
Characteristics for grade 20 ( 20 )
| Grade : | 20 ( 20 ) |
| Substitute : | 15, 25 |
| Classification : | High quality structural carbon steel |
Chemical composition in % for grade 20 ( 20 )
| C | Si | Mn | Ni | S | P | Cr | Cu | As |
|---|---|---|---|---|---|---|---|---|
| 0.17 - 0.24 | 0.17 - 0.37 | 0.35 - 0.65 | max 0.3 | max 0.04 | max 0.035 | max 0.25 | max 0.3 | max 0.08 |
Temperature of critical points for grade 20 ( 20 ).
| Ac1 = 724, Ac3 (Acm) = 845, Ar3 (Arcm) = 815, Ar1 = 682 |
Mechanical properties under Т=20oС for grade 20 ( 20 )
| Assortment | Dimension | Direct. | σB | σT | δ5 | ψ | KCU | Heat treatment |
|---|---|---|---|---|---|---|---|---|
| - | (mm) | - | MPa | MPa | % | % | kJ/m² | - |
| Sheet heat-treatment, GOST 4041-71 | 4 - 14 | 340-490 | 28 | |||||
| Pipe hot strain, GOST 550-75 | 431 | 255 | 22 | 50 | 780 | |||
| Pipe, GOST 8731-87 | 412 | 245 | 21 | |||||
| Pipe, GOST 10705-80 | 372 | 225 | 22 | |||||
| Rolled stock, GOST 1050-88 | to 80 | 410 | 245 | 25 | 55 | Normalizing | ||
| Rolled stock cold-worked , GOST 1050-88 | 490 | 7 | 40 | |||||
| Band annealed , GOST 2284-79 | 310-540 | 18 | ||||||
| Band cold-worked , GOST 2284-79 | 490-830 |
| Brinell hardness for 20 ( 20 ) (annealing) , GOST 1050-88 | HB 10 -1 = 163 MPa
| Brinell hardness for 20 ( 20 ) (cold-drawn, cold-worked) , GOST 1050-88 | HB 10 -1 = 207 MPa
| Brinell hardness for 20 ( 20 ) , Sheet GOST 4041-71 | HB 10 -1 = 127 MPa
| Brinell hardness for 20 ( 20 ) , Pipe GOST 550-75 | HB 10 -1 = 156 MPa
| Brinell hardness for 20 ( 20 ) , Pipe GOST 8731-87 | HB 10 -1 = 156 MPa
| Brinell hardness for 20 ( 20 ) , Sheet trick GOST 1577-93 | HB 10 -1 = 156 MPa
Technological properties for grade St3sp ( Ст3сп )
| Weldability : | without limitations. |
| Flakes : | not predisposed |
| Temper brittleness: | not predisposed |
Physical properties for grade 20 ( 20 )
| T | E 10-5 | α 10⁶ | λ | ρ | C | R 10⁹ |
|---|---|---|---|---|---|---|
| Grade | MPa | 1/Grade | Watt/(m·Grade) | kg/m3 | J/(kg·Grade) | Ohm·m |
| 20 | 2.13 | 52 | 7859 | |||
| 100 | 2.03 | 11.6 | 50.6 | 7834 | 486 | 219 |
| 200 | 1.99 | 12.6 | 48.6 | 7803 | 498 | 292 |
| 300 | 1.9 | 13.1 | 46.2 | 7770 | 514 | 381 |
| 400 | 1.82 | 13.6 | 42.8 | 7736 | 533 | 487 |
| 500 | 1.72 | 14.1 | 39.1 | 7699 | 555 | 601 |
| 600 | 1.6 | 14.6 | 35.8 | 7659 | 584 | 758 |
| 700 | 14.8 | 32 | 7617 | 636 | 925 | |
| 800 | 12.9 | 7624 | 703 | 1094 | ||
| 900 | 7600 | 703 | 1135 | |||
| 1000 | 695 | |||||
| T | E 10 -5 | α 10⁶ | λ | ρ | C | R 10⁹ |
Equivalent steels for grade 08KH18N10T ( 08Х18Н10Т )
Warning! Indicated both exact and nearest equivalents.
| USA | Germany | Japan | France | England | European | Italy | Belgium | Spain | China | Sweden | Bulgaria | Hungary | Poland | Romania | Czechia | Austria | Switzerland | South Korea |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| - | DIN,WNr | JIS | AFNOR | BS | EN | UNI | NBN | UNE | GB | SS | BDS | MSZ | PN | STAS | CSN | ONORM | SNV | KS |
| 1020 1023 1024 G10200 G10230 H10200 M1020 M1023 | 1.0402 1.0405 1.1151 C22 C22E C22R Ck22 Cm22 Cq22 St35 St45-8 | S20C S20CK S22C STB410 STKM12A STKM12A-S STKM13B STKM13B-W | 1C22 2C22 AF42 AF42C20 C20 C22 C22E C25E XC15 XC18 XC25 | 050A20 055M15 070M20 070M26 1449-22CS 1449-22HS 1C22 22HS 430 C22 C22E | 1.0114 Fe37-3FN Fe37-3FU Fe37B1FN Fe37B1FU Fe37B3FN Fe37B3FU S235 S235J0 S235J2G3 S235JR S235JRG2 | C18 C20 C21 C22 C22E C22R C25 C25E | C25-1 C25-2 | 1C22 C22 C25k F.112 F.1120 | 1C22 20 20G 20R 20Z | 1450 | 20 C22 C22E | A45.47 C22E | 20 K18 | OLC20 OLC20X | 12022 12024 | 1020 M1020 | Ck22 | SM20C SM20CK SM22C |
Types of delivery of grade 20 ( 20 )
- B03 - Metal forming treatment. Forgings
- В22 - Graded and shaped rolling
- B23 - Sheets and Strips
- B24 - Ribbons
- B32 - 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
- В76 - Metal nets
Specification
Mechanical properties :
σB - Tensile strength [MPa]
σT - Yield stress [MPa]
δ5 - Specific elongation at fracture [%]
ψ - Reduction of area [%]
KCU - Impact strength [kJ/m²]
HB - Brinell hardness [MPa]
Physical properties :
T - Test temperature [Grade]
E - Young modulus [MPa]
α - Coefficient of linear expansion (20° - T) [1/Grade]
λ - Thermal (heat) condition coefficient [Watt/(m·Grade)]
ρ - Density [kg/m³]
C - Specific heat (range 20° - 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