Steel 22K

Designation

Name The value
Designation GOST Cyrillic 22К
Designation GOST Latin 22K
Transliteration 22K
By 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 strips В23 GOST 5520-79, GOST 19903-74, GOST 19903-90
Processing of metals by pressure. 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
Steel pipes and fittings to them В62 TU 0893-069-00212179-2011
Sheets and strips 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
Blanks. Of the workpiece. Slabs В31 TU 108-665-77, TU 108-972-80, TU 302.02.092-90
Bars and shapes В32 TU 14-2-553-83

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu N As
GOST 5520-79 0.19-0.26 ≤0.035 ≤0.04 0.75-1 ≤0.3 0.17-0.4 ≤0.3 Rest ≤0.3 ≤0.008 ≤0.08
TU 108.11.917-87 0.19-0.26 ≤0.025 ≤0.025 0.75-1 ≤0.4 0.2-0.4 ≤0.3 Rest ≤0.3 - -
TU 302.02.092-90 0.19-0.26 ≤0.025 ≤0.025 0.75-1 ≤0.4 0.2-0.4 ≤0.3 Rest ≤0.3 ≤0.008 ≤0.08
Fe is the basis.
According to GOST 5520-79, the mass fraction of arsenic can be up to 0.15% in the smelting of steel from the Kerch ore, while the mass fraction of phosphorus should not be more than 0.030%. At the request of the consumer, the mass fraction of sulfur should not exceed 0.025, 0.030 or 0.035%, and phosphorus 0.030 or 0.035%. When steel is smelted in electric furnaces, the mass fraction of nitrogen must be ≤ 0.012%.
According to TU 108.11.917-87, after processing the steel on the OSRV, a limitation on the sulfur content ≤ 0.015% and phosphorus ≤ 0.015% is introduced. The total content of sulfur and phosphorus after OSRV ≤ 0.020%.
According to TU 302.02.092-90 the chemical composition is given for steel grade 22K; in steel grade 22KM carbon weight fraction of 0.17-0.24%, manganese 0.35-0.65, the mass fractions of the remaining elements are identical to the brand 22K. At the direction of the metallurgy department of the manufacturer, when adding steel as a technological additive, ferro-titanium additive is allowed not more than 0.050% titanium, or ferrovanadium not more than 0.050% vanadium (calculated), or vanadium not more than 0.050% and titanium not more than 0.030% simultaneously (taking into account the residual vanadium in steel). The content of titanium, vanadium and aluminum in the ladle sample is determined, entered in the certificate, but is not a delivery. The content of nickel (by agreement) is not more than 0.50%. After treatment with OSRP, the total content of sulfur and phosphorus in the steel should not be more than 0.020%. In electric steel, as well as in the metal of ESR and VDP, obtained by remelting electric steel, the nitrogen content should not be more than 0.012%.

Mechanical properties

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

Physical characteristics

Temperature Е, HPa r, kg/m3 l, W/(m · °C) R, Mr. · m a, 10-6 1/°C С, J/(kg · °C)
20 211 7859 517 173 - -
300 200 7770 44 381 128 483
400 191 7736 427 487 134 525
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.
Склонность к отпускной хрупкости Tend not.
The temperature of forging Start - 1280 °C, end - 700 °C. the cross Sections up to 400 mm are cooled in air.
Flock-sensitive sensitivity not sensitive.