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Steel 20K

VSt6ps VSt5sp VSt3kp VSt4kp VSt6sp VSt2kp Vst4ps St0 VSt2ps VSt3ps VSt5ps VSt2sp VSt3sp 18К 08ps 10ps 15К 18kp 20ps 35 55 05kp 08Ю 15kp 20 (20А) 22К 40 58 (55ПП) 08 10 (Art. 10) 12К 15pc 20К 25 45 60 08kp 10kp 15 16К 20kp 30 50 0cB 60С2 60C2XA 50XFA 60C2A 60C2CHFA 65C2VA 85 55XGR 65 70C3A 55С2 60Г 60C2H2A 65Г 70 75 SHKH15 SHKH15SG SH4 А12 А20 A40G А30 10XNDP 14G2AF 15G2AFDps 17GS 18G2AFps 09Г2 10G2BD 10ХСНД 12GS 15G2SFD 16GS 35GS 14CGS 15ХСНД 20ХГ2Ц 09G2S 10G2S1 14Г2 16G2AF 17G1S 25G2S 10Г2 14X2GMR 15KHF 18CR2N4MA 20Г 20X2H4A 20XGR 20KHN2M (20KHNM) 30Г 30CGS 30CRNI2MA 34CRNI3M 35Х 38CR2N3M 38XA 38CMA 3CR3M3F 40Х 40XFA 45CRN 50Г2 12XH2 15Х 20KHGSA 20XHN3A 25CGSA 30KHGSA 30CRNI2MOVA 33HS 35KHN1M2FA 38CR2NM 40Г 40CR2H2MA 40CRN 45Г 45CRNI2MOVA 50Х 12XH2A 18CGT 20CRNR 20CRNI4FA 25CGT 30Х 30CGSN2A 30KHN3A 34CRNI1M 35Г 36CR2NI2MOVA 38KH2NMF 38CRN 38CRNI3MA 40Г2 40CRNI2MA 45Г2 47GT 50XH 12CR2N4A 12XHN3A 15Г 18CR2N4VA 20Х 20XH 20XNR 30CGT 30ХН3М2ФА 35Г2 35CGSA 38CR2H2MA 38CRNI3MOVA 40HS 45Х 50Г

Description

Steel 20K

Steel 20K: brand of steels and alloys. Below is a systematized information on the purpose, chemical composition, types of supplies, substitutes, temperature of critical points, physical, mechanical, technological and casting properties for the grade — Steel 20K.

General information of steel 20K

Substitute brand
steel 15K
Delivery type
Thick sheet 20k GOST 5520−79, GOST 19903−74.
Application
Flanges, bottoms, solid-forged and welded drums of steam boilers, half-couplings, apparatus bodies and other parts of boiler construction and vessels, operating under pressure and at temperatures up to 450 ° C.

Chemical composition of steel 20K

Chemical element %
Silicon (Si) 0.15−0.30
Manganese (Mn) 0.35−0.65
Copper (Cu), no more 0.30
Arsenic (As), no more 0.08
Nickel (Ni), no more 0.30
Sulfur (S), no more 0.040
Carbon (C) 0.16−0.24
Phosphorus (P), no more 0.040
Chromium (Cr), no more 0.30

Mechanical properties of steel 20K

Fur. properties
Fur. properties versus test temperature
Fur. properties depending on heat treatment
Fur. properties when tested for long-term strength

Mechanical properties

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% KCU, J / m 2
KCU — as delivered / after mechanical aging
Category sheets: 2−5, 10, 11, 16, 18 <20 245 400−510 59 59/29
Category sheets: 2−5, 10, 11, 16, 18 21−40 235 400−510 54 54/24
Category sheets: 2−5, 10, 11, 16, 18 41−60 225 400−510 49 49/24

Mechanical properties versus test temperature

test t, ° C σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Sheets 37−40 mm thick, hot rolled
20 215−245 400−440 thirty 56 62−103
100 195 390 20 47−55 88−167
200 195   15−17 39 73−137
300 165   23 44−51 64−113
400 165 370 24 61 54−78
500 155 250 23 61 44−73
600 59 110 31−37 73−81 59−225
Lmsta 37−40 mm thick after annealing at 880−900 ° C.
20 245 400−430 thirty 55−60 73−98
200 180−225 350−500 17−28 43−62 83−117
300 145−185 350−510 24 52−60 78−93
400 135−175 320−400 22−33 60−73 59−73
500 120−150 200−270 24−43 71−83 49−64
600 69−98 110−150 36−48 84−91 113

Mechanical properties depending on heat treatment

Heat treatment, delivery condition σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Hot rolled condition, heat exposure 10,000 h, 450 ° С. 235−245 425 30−32 59−83 55−83
Hot rolled condition, heat exposure 30,000 h, 450 ° C. 235 395 32 62 82−125
Hot rolled condition, heat exposure 40,000 h, 450 ° С. 210 395 29−31 60−62 81−104
Hot rolled condition, heat exposure 10,000 h, 500 ° C. 185−215 350−360 27−31 65−68 75−137
Hot rolled condition, heat exposure 30,000 h, 500 ° C. 175−195 360 30−33 62−64 88−125

Mechanical properties when tested for long-term strength

Creep limit, MPa Creep rate,% / h t test, ° С Long-term strength, MPa Duration tests, h t test, h
108 1/100000 400 127 10000 450
94 1/10000 450 93 100,000 450
63 1/100000 450 76 10000 500
      54 100,000 500

Technological properties of steel 20K

Forging temperature
Beginning 1260, end 750.
Weldability
Can be welded without restrictions. Methods of welding RDS, ADS submerged arc and gas shielded, EShS.
Tendency to release ability
Not inclined.
Flock sensitivity
Not sensitive.

Temperature of critical points of steel 20K

Critical point ° C
Ac1 724
Ac3 845
Ar3 815
Ar1 682

Yield strength of steel 20K

Test temperature, ° C / s 0.2
200 250 300 350 400 450
215 195 175 155 135 120

Physical properties of steel 20K

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 207 204 201 196 187 176 162      
Density of steel, pn, kg / m 3 7850                  
Thermal conductivity coefficient W / (m ° С)   51 49 46 42 39 36      
Test temperature, ° С 20−100 20−200 20−300 20−400 20−500 20−600 20−700 20−800 20−900 20−1000
Linear expansion coefficient (a, 10−6 1 / ° С)   11.9 12.8 13.2 13.6 13.9        
Specific heat (C, J / (kg ° C)) 470 483   538 571          

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