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Steel 25HGSA

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 25HGSA

Steel 25HGSA: brand of steels and alloys. Below is the 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 25HGSA.

General information about steel 25HGSA

Substitute brand
Steel 20KHGSA.
Delivery type
Long products, including shaped: GOST 4543−71, GOST 259071, GOST 2591−71, GOST 2879−69. Calibrated bar GOST 7417−75, GOST 8559−75, GOST 8560−78, GOST 1051−73. Polished bar and silver bar GOST 14955−77. Thin sheet GOST 11268−76. Thick sheet GOST 11269−76. Strip GOST 103−76.
Application
Responsible welded and stamped parts used in improved condition: lead screws, axles, shafts, worms, connecting rods, crankshafts, rods and other parts.

Chemical composition of steel 25HGSA

Chemical element %
Silicon (Si) 0.90−1.20
Manganese (Mn) 0.80−1.10
Copper (Cu), no more 0.30
Nickel (Ni), no more 0.30
Sulfur (S), no more 0.025
Carbon (C) 0.22−0.28
Phosphorus (P), no more 0.025
Chromium (Cr) 0.80−1.10

Mechanical properties of steel 25HGSA

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Bar. Quenching 880 ° C, oil. Vacation 480 ° C, water or oil fifteen 830 1080 ten 40 59
Sheets of 4, 5 categories. Hardening 880 ° С, oil. Vacation 470−550 ° C, water or oil. Samples   1030 ten   49

Mechanical properties depending on the tempering temperature

vacation t, ° С σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HRC e
A bar with a cross section of 20−70 mm. Hardening 890 ° С, oil.
300 1320 1510 12 57 69 44
400 1200 1270 12 59 69 42
500 980 1030 17 60 127 35
600 730 830 20 67 196 25

Mechanical properties depending on the section

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Hardening 890 ° С, oil. Vacation 600 ° C, water.
Sample cutting location — center thirty 520 690 25 67 183
Sample cutting location — center 80 400 630 24 67 186
Sample cutting location — center 200 390 610 thirty 67 182
Sample cutting location — edge 200 450 700 28 67 171
Hardening 890 ° C, through water to oil. Vacation 600 ° С, water
Sample cutting location — center 50 560 720 26 69 207
Sample cutting location — center 120 440 660 26 67 225
Sample cutting location — edge 120 550 720 21 67 198
Sample cutting location — center 160 410 640 28 68 189
Sample cutting location — edge 160 520 710 24 67 211
Sample cutting location — center 200 390 630 29 66 183
Sample cutting location — edge 200 510 710 25 63 154

Technological properties of steel 25HGSA

Forging temperature
Beginning 1180, end 850.
Weldability
weldable without restrictions
Machinability by cutting
After quenching, tempering σ B = 780−900 MPa НВ 228−262, K υ tv.spl. = 0.8, K υ b.st. = 0.72.
Tendency to release ability
inclined
Flock sensitivity
sensitive

Temperature of critical points of steel 25HGSA

Critical point ° C
Ac1 755
Ac3 840
Ar1 690

Impact strength of steel 25HGSA

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -20 -40 -60
Tempering 890 С, oil. Vacation 600 C, air. 183 160 132 78

Endurance limit of steel 25HGSA

σ -1, MPa n σ B, MPa Heat treatment, steel condition
534 1E + 7 1590 Hardening. Vacation 200 С
509 1E + 7 1430 Hardening. Vacation 400 С
402 1E + 7 870 Hardening. Vacation 600 С

Hardenability of steel 25HGSA

Hardening 870 С. Hardness HRCэ.

Distance from the end, mm / HRC e
1.5 3 6 nine 12 eighteen 24 thirty 36 42
52.0 52.0 50.5 49.0 44.5 40.5 38.5 36.5 35.5 35

Short-term thermal strength of steel 25HGSA

Test temperature, ° С s 0.2, MPa σ B, MPa d 5 ,% y,%
300 650 780 19 58
400 580 680 22 69
500 450 490 thirty 83
600 265 295 48 88

Physical properties of steel 25HGSA

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 213 206 194 187 175 168 163 143 130  
Torsional shear elastic modulus G, GPa 83 81 76 74 68 65 63 51 49  
Density of steel, pn, kg / m 3 7850 7830 7790 7760 7730 7690 7650 7610    
Thermal conductivity coefficient W / (m ° С) 35 36 37 37 39 34 32 31 29  
Ud. electrical resistance (p, Nom. m) 306 338 415 501 573 660 830 1000 1100  
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 13.6 14.0 14.2 14.4 14.5 12.3    
Specific heat (C, J / (kg ° C)) 496 504 512 533 554 584 622 693    

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