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Steel 25

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 25

Steel 25: 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 Steel 25 grade.

General steel 25

Substitute brand
steel: 20, steel 30
Delivery type
Circle 25, rolled sections, including shaped: GOST 1050−74, GOST 2590−71, GOST 2591−71, GOST 2879−69, GOST 8509−86, GOST 8510−86, GOST 8240−72, GOST 8239−72… Calibrated bar GOST 7417−75, GOST 8559−75, GOST 8560−78, GOST 10702−78. Polished bar and silver bar GOST 14955−77, GOST 10702−78. Thick sheet GOST 1577−81, GOST 19903−74. Thin sheet GOST 16523−70. Tape GOST 6009−74, GOST 2284−79. Strip GOST 1577−81, GOST 103−76, GOST 82−70. Wire GOST 5663−79, GOST 17305−71. Forgings and forged billets GOST 8479−70, GOST 1133−71.
Application
Axles, shafts, couplings, pawls, levers, forks, washers, rollers, bolts, flanges, tees, fasteners and other irrelevant parts; after HTT — screws, bushings, pawls and other parts, which are subject to requirements of high surface hardness and wear resistance with low core strength.

Chemical composition of steel 25

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.50−0.80
Copper (Cu), no more 0.25
Arsenic (As), no more 0.08
Nickel (Ni), no more 0.25
Sulfur (S), no more 0.04
Carbon (C) 0.22−0.30
Phosphorus (P), no more 0.035
Chromium (Cr), no more 0.25

Mechanical properties of steel 25

Mechanical properties at elevated temperatures

test t, ° C σ 0.2, MPa σ B, MPa δ 5 ,% δ 10 ,% ψ,% KCU, J / m 2
After rolling. Deformation rate 0.8 mm / min
20 310 490   28 58 78
200 320 560   thirteen 44 97
300 200 540   22 57 88
400 165 465   25 66 69
500 150 330   28 70 49
Sample with a diameter of 6 mm and a length of 30 mm, rolled. Deformation rate 16 mm / min. Strain rate 0.009 1 / s.
700 130 145 42   77  
800 69 96 57   78  
900 47 79 53   95  
1000 40 54 60   100  
1100 24 38 66   100  
1200 fourteen 23 101   100  
1300 20 25 67   100  

Mechanical properties of rolled products

Heat treatment, delivery condition σ B, MPa δ 5 ,% δ 4 ,% ψ,% HB
Hot rolled steel, forged, calibrated and silver grade 2 after normalization 450 23   50  
Calibrated steel grade 5 after annealing or high tempering 410 19   50  
Calibrated work-hardened steel with special finishing without heat treatment 540 7   40 217
Normalized or hot rolled strips 450 23   50  
Heat-treated sheet of the 1st-2nd category 390−540 26      
Hot rolled sheet 390−540   21    
Cold rolled sheet 390−540   22    

Mechanical properties of forgings

Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB
Hardening. Vacation. Normalization.
<100 175 350 28 55 64 101−143
100−300 175 350 24 50 59 101−143
300−500 175 350 22 45 59 101−143
<100 195 390 26 55 59 111−156
100−300 195 390 23 50 54 111−156
300−500 195 390 20 45 49 111−156
<100 215 430 24 53 54 123−167
100−300 215 430 20 48 49 123−167
<100 245 470 22 48 49 143−179
Hardening. Vacation.
100−300 275 530 17 38 34 156−197

Mechanical properties of steel after HTT

Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% HB HRC e
Cementation 920−950 ° C, hardening 820−840 ° C, water, tempering 180−200 ° C, air.
50 345 550 25 45 170 55−63

Technological properties of steel 25

Forging temperature
Beginning 1280, end 700. Air cooling.
Weldability
It is welded without restrictions, except for parts after HTT. Methods of welding RDS, ADS submerged arc and gas shielded, KTS.
Machinability by cutting
In the hot-rolled state with σ B = 450−490 MPa K υ tv.spl. = 1.7 and K υ b.st. = 1.6.
Tendency to release ability
Not inclined.
Flock sensitivity
Not sensitive.

Temperature of critical points of steel 25

Critical point ° C
Ac1 735
Ac3 835
Ar3 825
Ar1 680

Impact strength of steel 25

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -20 -40 -60
Annealing 136−145 28−68 25−44 7.8
Normalization 196 97−149 43−115 37−49

Endurance limit steel 25

σ -1, MPa n σ B, MPa σ 0.2, MPa Heat treatment, steel condition
203   460 330 Tempering 870 C, oil. Vacation 480 С.
186   410   Annealing.
245 1E + 7     Normalization
225   400   After rolling.

Physical properties of steel 25

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 198 196 191 186 163          
Torsional shear elastic modulus G, GPa 81 80 76 73 70 66 61      
Density of steel, pn, kg / m 3 7820                  
Thermal conductivity coefficient W / (m ° С)   51 49 46 43 40 36 32 26 27
Ud. electrical resistance (p, Nom. m) 169 219 292 381 488 601 758 925    
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) 12.2 13.0 13.7 14.3 14.7 15.0 15.2 12.7 12.4 13.4
Specific heat (C, J / (kg ° C)) 470 483   521 571          

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