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Steel 15X

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 15X

Steel 15X: 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 15X.

General information about steel 15X

Substitute brand
steel 20X.
Delivery type
Long products, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69, GOST 4693−77, GOST 10702−78. Calibrated bar GOST 7414−75, GOST 8559−75, GOST 8560−78, GOST 1051−73, GOST 10702−78. Polished bar and silver bar GOST 14955−77. Strip GOST 103−76. Forgings and forged billets GOST 8479−70, GOST 1131−71. Pipes GOST 8733−87, GOST 8734−75.
Application
bushings, pins, gears, rollers, pushers and other cemented parts, which are required to have high surface hardness with low core strength, parts operating under frictional wear conditions.

Chemical composition of steel 15X

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.40−0.70
Copper (Cu), no more 0.30
Nickel (Ni), no more 0.30
Sulfur (S), no more 0.035
Carbon (C) 0.12−0.18
Phosphorus (P), no more 0.035
Chromium (Cr) 0.70−1.00

Mechanical properties of steel 15X

Mechanical properties at elevated temperatures

test t, ° C σ B, MPa δ 10 ,% ψ,%
Sample 10 mm in diameter, 100 mm long, annealed. The movement speed of the machine grips is 0.38−0.47 mm / min.
800 48 36 56
900 47 19 25
1000 32 29 52
1100 32 42 96
1150 19 52 98

Mechanical properties of rolled products

Heat treatment, delivery condition σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB HRC e
Bar. Quenching 880 ° C, water or oil, quenching 770−820 ° C, water or oil, tempering 180 ° C, air or oil 490 690 12 45 64    
Calibrated and calibrated steel with special finishing after annealing or tempering   550   60   179  
Calibrated and calibrated steel with special finishing after spheroidizing annealing   340−440   60   179  
Steel calibrated and calibrated with a special finish, work-hardened without heat treatment   590 five 45   207  
Bar. Cementation 910 ° С, quenching 790 ° С, water, tempering 190 ° С. 370 610 fifteen 45 59 179 58−64

Mechanical properties of forgings

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB
Normalization
KP 195 <100 195 390 26 55 59 111−156
KP 195 100−300 195 390 23 50 54 111−156
Quenching, tempering
KP 345 <100 345 590 eighteen 45 59 174−217

Mechanical properties depending on the tempering temperature

vacation t, ° С σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Hardening 880 ° C.
200 550 780 7 46 39
300 560 750 4 55 49
400 560 720 6 59 78
500 540 680 nine 61 98
600 530 630 ten 61 127

Technological properties of steel 15X

Forging temperature
Beginning 1260, end 800. Billets with a section up to 200 mm are cooled in air, 200−700 mm are subjected to low-temperature annealing.
Weldability
welded without restrictions (except for chemically-thermally treated parts). Welding methods: RDS, KTS without restrictions.
Machinability by cutting
at σ B = 730 MPa K υ tv.spl. = 1,0, K υ b.st. = 0.9.
Tendency to release ability
not inclined
Flock sensitivity
not sensitive

Temperature of critical points of steel 15X

Critical point ° C
Ac1 766
Ac3 838
Ar3 799
Ar1 702

Impact strength of steel 15X

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -40
Sample after quenching at 850 C, oil, tempering at 200 C, 1 h. 98 61

Hardenability of steel 15X

Hardness for strips HRCe.

Distance from the end, mm / HRC e
1.5 3 4.5 6 7.5 nine 10.5 12 13.5 fifteen
36−44.5 32−44.5 25−42.5 38.5 33 29 26 24.5 23 22
 

Physical properties of steel 15X

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 215 212 194 191 179 170 162 142 132  
Torsional shear elastic modulus G, GPa 83 82 76 74 71 67 63 55 50  
Density of steel, pn, kg / m 3 7830 7810 7780   7710   7640      
Thermal conductivity coefficient W / (m ° С) 44 44 43 41 39 36 33 32 32  
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) 10.2 11.5 12.4 13.0 13.5 14.0        
Specific heat (C, J / (kg ° C)) 496 508 525 538 567 588 626 706    

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