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Steel 22K

Designation

Name The value
Designation GOST Cyrillic 22К
Designation GOST Latin 22K
Transliteration 22K
The chemical elements 22

Description

Steel 22K is used: for the manufacture of forgings of various parts of General machinery; type details of bottoms, shells, collar flanges, forged and welded drums of steam boilers, fittings, rings, tubes, tees and parts of rectangular shape for power equipment and pipelines with an absolute pressure of more than 3.9 MPa, thermal power plants and for operation at temperatures from -40 °C to +450 °C; vessels, working under pressure; equipment of nuclear power plants.

Standards

Name Code Standards
Sheets and stripes В23 GOST 5520-79, GOST 19903-74, GOST 19903-90
Metal forming. Forgings В03 OST 108.030.113-87, OST 26-01-135-81, TU 108-11-910-87, TU 108.11.917-87, ST ЦКБА 010-2004
Pipes steel and connecting parts to them В62 TU 0893-069-00212179-2011
Sheets and stripes В33 TU 108-1025-81, TU 108-11-296-87, TU 108.11.906-87, TU 302.02.118-91, TU 05764417-041-95, TU 0900-005-05764417-99, TU 108.11.543-80
Bulls. Blanks. Slabs В31 TU 108-665-77, TU 108-972-80, TU 302.02.092-90
Sectional and shaped rolling В32 TU 14-2-553-83

Mechanical characteristics

Section, mm sT|s0,2, MPa σB, MPa d5, % d y, % kJ/m2, кДж/м2
Leaves categories: 2-4, 10, 16, 18-21 (KCU - as supplied / after mechanical aging)
25-60 ≥265 430-590 ≥22 - - ≥588/294
60-70 ≥255 430-590 ≥22 - - ≥588/294
Rolled sheet. Normalization at 940-960 °C + Vacation at 630-650 °C, air cooling at a speed of 65 °C/h
30-70 ≥250 ≥510 ≥22 - ≥50 ≥834
60-90 - ≥440 - - - ≥589
Heated to 920-940 °C, cooling to 100 °C/h + Vacation at 600 °C cooling 50 °C/h (the duration and temperature of heat exposure)
- ≥230 ≥470 - ≥29 ≥59 ≥804
- ≥230 ≥440 - ≥31 ≥64 ≥961
- ≥240 ≥470 - ≥25 ≥59 -
- ≥255 ≥435 - ≥34 ≥64 ≥765
Leaves 30-70 mm, HR
- 245-295 500-520 22-26 - 50-61 -
- 225-275 460-490 - - - -
- 215-265 - - - - -
- 215-235 - - - - -
- ≥225 450-470 - - 59-63 -
- ≥195 280-310 19-29 - 60-68 -
- 110-130 135-165 20-34 - 60-68 -
Leaves 30-70 mm. hot-rolled Heating to 930 °C (extract 2 h), cooling at a speed of 80-100 °C/h + Vacation at 600-650 °C, cooling at a rate of 50 °C/h
- 225-245 460-470 31-36 - 61-66 -
- 185-215 390-430 26-27 - 64-65 -
- 165-185 390-430 25-27 - 59-62 -
- 155-165 ≥390 27-29 - 73-75 -
- 135-145 255-265 28-31 - 80-82 -
- ≥110 ≥160 33-41 - 87-88 -
Sample prokatnyh 6 mm, length 30 mm. the Rate of deformation of 16 mm/min strain Rate 0,09 1/
- ≥81 ≥120 ≥57 - ≥90 -
- ≥56 ≥72 ≥49 - ≥63 -
- ≥49 ≥84 ≥60 - ≥86 -
- ≥45 ≥59 ≥59 - ≥86 -
- ≥26 ≥42 ≥75 - ≥100 -

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
d 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)
20 211 7859 517 173 - -
200 205 7803 46 292 126 470
300 200 7770 44 381 128 483
400 191 7736 427 487 134 525
500 180 7699 393 601 135 525
600 165 7659 356 758 136 -
700 - 7617 319 925 146 571
800 - 7624 259 1094 127 -
900 - 7600 264 1135 124 -
1000 - 7548 277 1167 134 -
1100 - 7496 285 1194 142 -
1200 - - 298 1219 148 -

A description of the physical symbols

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

Technological properties

Name The value
Weldability Limited weldability. Method of welding RDS, ADS under flux and gas protection. Recommended heating and subsequent heat treatment. ESW requires heat treatment.
Propensity to temper brittleness Tend not.
Forging temperature Start - 1280 °C, end - 700 °C. the cross Sections up to 400 mm are cooled in air.
Flock-sensitive sensitivity not sensitive.

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