By visiting this site, you accept the use of cookies. More about our cookie policy.

Steel 20K

Designation

Name The value
Designation GOST Cyrillic 20К
Designation GOST Latin 20K
Transliteration 20K
The chemical elements 20

Description

20K steel is used: for the manufacture of flanges, bottoms, telecomandi and welded the drums of steam boilers; coupling parts, chassis bodies and other parts of the boiler and vessels, working under pressure and at temperatures up to +450 °C; as a base layer in the manufacture of hot-rolled dual-layer corrosion-resistant sheets.

Standards

Name Code Standards
Sheets and stripes В33 GOST 10885-85, TU 14-1-3922-84, TU 14-1-4088-86
Sheets and stripes В23 GOST 5520-79, GOST 19903-74, GOST 19903-90
Classification, nomenclature and general norms В30 TT 232-41-2007
Bulls. Blanks. Slabs В31 TU 05764417-013-93

Mechanical characteristics

Section, mm sT|s0,2, MPa σB, MPa d5, % y, % kJ/m2, кДж/м2 Brinell hardness number, MPa
Steel hot-rolled sheet in the delivery condition
21-40 ≥240 ≥410 ≥24 - ≥637 -
4-20 ≥250 ≥410 ≥24 - ≥686 -
41-60 ≥230 ≥410 ≥24 - ≥588 -
Casting as supplied. Without heat treatment
- ≥220 ≥420 ≥22 ≥35 ≥490 -
Sheet gracieacademy (specified time and temperature of exposure)
- 235-245 425 30-32 59-83 - -
- 185-215 350-360 27-31 65-68 - -
- 235 395 32 62 - -
- 175-195 360 30-33 62-64 - -
- 210 395 29-31 60-62 - -
Sheets hot rolled 37-40 mm
- 215-245 400-440 30 56 - -
- 195 390 20 47-55 - -
- 195 - 15-17 39 - -
- 165 - 23 44-51 - -
- 165 370 24 61 - -
- 155 250 23 61 - -
- 59 110 31-37 73-81 - -
Sheets hot rolled 37-40 mm. Annealing at 880-900 °C
- 245 400-430 30 55-60 - -
- 180-225 350-500 17-28 43-62 - -
- 145-185 350-510 24 52-60 - -
- 135-175 320-400 22-33 60-73 - -
- 120-150 200-270 24-43 71-83 - -
- 69-98 110-150 36-48 84-91 - -
Procurement for vessels working under pressure on the other 05764417-013-93 supplied after the main heat treatment (samples for forgings, longitudinal, - transverse; KCU - after mechanical aging)
≥275 430-590 ≥23 ≥55 ≥290 ≥140
Sheet metal, steel, 20KA at TT 232-41-2007 after heat treatment. In the graph indicated the value of KCU KCV
≥275 430-590 ≥23 - ≥490 -
Leaves categories: 2-5, 10, 11, 16, 18-21 (KCU - as supplied / after mechanical aging)
≤5 ≥245 ≤510 ≥25 - - -
21-40 ≥235 400-510 ≥24 - ≥540/245 -
41-60 ≥225 400-510 ≥23 - ≥490/245 -
5-20 ≥245 400-510 ≥25 - ≥588/294 -
The plates on the other 14-1-3922-84. Normalized samples
≥206 ≥392 ≥20 - ≥490 -

Description mechanical marks

Name Description
Section Section
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σB Limit short-term strength
d5 Elongation after rupture
y The relative narrowing
kJ/m2 Toughness

Physical characteristics

Temperature Е, ГПа r, кг/м3 l, Вт/(м · °С) R, НОм · м a, 10-6 1/°С С, Дж/(кг · °С)
0 207 7850 - - - -
20 211 7870 - 200 - 482
100 204 7840 51 219 - 486
200 201 7810 49 292 119 470
300 196 7780 46 381 128 483
400 187 7740 42 487 132 533
500 176 7710 39 601 136 538
600 162 7670 36 758 136 584
700 - 7630 - 925 - 571
800 - 7640 - 1094 139 703
900 - 7610 - 1135 - 703
1000 - 7550 - 1167 - 695
1200 - - - 1219 - 687

A description of the physical symbols

Name Description
Е The normal elasticity modulus
r Density
l Coefficient of thermal conductivity
R UD. the resistivity

Technological properties

Name The value
Weldability Welded without any restrictions. The welding methods of SMAW, ADS submerged arc and gas protection electroslag welding.
Propensity to temper brittleness Tend not.
Forging temperature Start - 1260 °C, the end - 750 °C.
Flock-sensitive sensitivity not sensitive
Workability by cutting In the annealed condition with NV 121-126 and blower SB=390 MPa Kn TV.SPL.=1,50 Kn b.St.=Of 1.35.
Macrostructure and contamination The macrostructure of the steel on the etched templeto should not be visible during visual inspection of cracks, delamination, placenow, bubbles. Allowed black travelmasti without discontinuity of metal with a length of not more than 15 mm, and a separate slag inclusions. The amount of nonmetallic inclusions (in points), estimated collectively defined by GOST 1778, shall not exceed the standards for average score: sulfides, oxides, stroke, silicates fragile 2.5 points for each parameter; the non-deformed silicates - 3.0 points. Sulfide and oxide nonmetallic inclusions should have a shape close to globular. Allowed separate sulfide inclusions elongated shape.
Microstructure The size of the actual grain should be no larger than 7 numbers according to GOST 5639. The banding structure of sheet metal must not exceed a score of 3 on a scale GOST 5640.

Our consultant will save your time

+49 (170) 650 7006
Telegram:
WhatsApp:

Subscription

Special offers and discounts. :)