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Steel 30X

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 30X

Steel 30X: 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 30X.

General information about steel 30X

Substitute brand
steel: 30ХРА, 35Х, 35ХРА.
Delivery type
Long products, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69, GOST 10702−78. Calibrated bar GOST 8559−75, GOST 8560−78, GOST 1051−73. Polished bar and silver bar GOST 14955−77. Thick sheet GOST 1577−81, GOST 19903−74. Strip GOST 82−70, GOST 103−76, GOST 1577−81. Forgings and forged billets GOST 1131−71.
Application
for axles, rollers, levers, bolts, nuts and other small parts.

Chemical composition of steel 30X

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.50−0.80
Copper (Cu), no more 0.30
Nickel (Ni), no more 0.30
Sulfur (S), no more 0.035
Carbon (C) 0.24−0.32
Phosphorus (P), no more 0.035
Chromium (Cr) 0.80−1.10

Mechanical properties of steel 30X

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Bar. Hardening 860 ° C, oil. Vacation 500 ° C, water or oil. 25 690 880 12 45 69
Forgings. Hardening. Vacation. KP 395 <100 395 615 17 45 59

Mechanical properties at elevated temperatures

test t, ° C σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Bar with a diameter of 40 mm. Hardening 860 ° C, oil. Vacation 500 ° C.
300 570 790 25 65 127
400 510 650 21 74 98
500 450 500 fourteen 75 83

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 800 ° C, water.
300 540 900 eleven 53 20
400 560 860 thirteen 54 39
500 440 690 eighteen 70 39
600 490 670 17 74 54

Mechanical properties depending on the section

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 4 ,% ψ,% KCU, J / m 2
Hardening 850 ° C, water. Vacation 550 ° C.
Sample cutting location — edge 40 510 720 22 66 216
Sample cutting location — center 40 490 680 27 65 196
Sample cutting location — edge 80 520 720 21 66 206
Sample cutting location — center 80 480 680 28 62 176
Sample cutting location — edge 120 520 720 21 65 206
Sample cutting location — center 120 420 680 28 60 167
Sample cutting location — edge 160 410 720 eighteen 64 206
Sample cutting location — center 160 420 670 27 61 154

Technological properties of steel 30X

Forging temperature
Beginning 1250, end 800. Slow cooling.
Weldability
limitedly welded. RDS, EShS with heating and subsequent heat treatment.
Tendency to release ability
inclined
Flock sensitivity
sensitive

Temperature of critical points of steel 30X

Critical point ° C
Ac1 740
Ac3 815

Impact strength of steel 30X

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +15 -20 -40 -70
Hardening 860 C, oil, tempering 200 C, oil. 42 34 34 33

Endurance limit of steel 30X

σ -1, MPa τ -1, MPa σ B, MPa σ 0.2, MPa
333 240 690 450

Hardenability of steel 30X

Hardening 860 C. Hardness for strips of hardenability HRCe.

Distance from the end, mm / HRC e
1.5 3 4.5 6 7.5 nine 10.5 13.5 16.5 24
48−54 44−53 40−51.5 36.5−49.5 34−46.5 31−42.5 28.5−39 25−34 30.5 27
Amount of martensite,% Crit. Diam. in oil, mm
50 15−25

Physical properties of steel 30X

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 208 211   197   175        
Torsional shear elastic modulus G, GPa 83                  
Density of steel, pn, kg / m 3 7820 7800 7770 7740 7700 7670 7630 7590 7610 7506
Thermal conductivity coefficient W / (m ° С)   47 44 42 39 36 32 29 26 27
Ud. electrical resistance (p, Nom. m) 210 259 330 417 517 636 778 934 1106 1145
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) 12.4 13.0 13.4 13.8 14.2 14.6 14.8 12.0 12.8 13.8
Specific heat (C, J / (kg ° C)) 482 496 513 532 555 583 620 703 687 678

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