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Steel 30KHGSN2A

Description

Steel 30KHGSN2A

Steel 30KHGSN2A: 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 30HGSN2A.

General information about steel 30HGSN2A

Delivery type
Circle 30khgsn2a, sheet 30khgsn2a, rolled sections, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated bar GOST 4543−71, GOST 7417−75, GOST 8559−75, GOST 8560−78, GOST 1051−73. Polished bar and silver bar GOST 4543−71, GOST 14955−77. Thick sheet GOST 11269−76. Thin sheet GOST 11268−76. Strip GOST 103−76. Forgings and forged billets GOST 1133−71, GOST 4543−71. Pipes OST 14−21−77.
Application
Gears, flanges, cams, pins, axle shafts, pins and other critical heavy-duty parts.

Chemical composition of steel 30HGSN2A

Chemical element %
Silicon (Si) 0.90−1.20
Manganese (Mn) 1.00−1.30
Copper (Cu), no more 0.30
Nickel (Ni) 1.40−1.80
Sulfur (S), no more 0.025
Carbon (C) 0.27−0.34
Phosphorus (P), no more 0.025
Chromium (Cr) 0.90−1.20

Mechanical properties of steel 30HGSN2A

σ 0.2, MPa σ B, MPa δ 5 ,% δ 10 ,% ψ,% KCU, J / m 2
Bar. Hardening 900 ° C, Oil. Vacation 260 ° C, air or oil.
1375 1620 nine   45 59
Softened or normalized sheets of the 1,3,5th category (transverse samples)
  490−830 19      
  490−830   fifteen    

Mechanical properties at elevated temperatures

test t, ° C σ 0.2, MPa σ B, MPa δ 5 ,% δ 10 ,% ψ,% KCU, J / m 2
Hardening 890 ° С, oil. Vacation 360 ° C, oil.
20   1550   nine 52 60
250   1550   nine 52 60
300   1550   ten 53 58
350   1400   ten 54 52
450 710 860   21 72  
Sample 10 mm in diameter, 50 mm long, rolled. Deformation rate 20 mm / min. Strain rate 0.007 1 / s.
800 98 115 33   77  
900 64 81 51   77  
1000 42 49 53   90  
1100 25 32 67   100  
1200 fifteen 22 69   100  
1250 eleven 17 77   100  

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
Quenching 900 ° C, oil, cooling after tempering in oil.
200 1500 1900 fifteen 55 120 52
300 1500 1800 fifteen 53 90 51
400 1350 1500 fifteen 52 80 49
500 1150 1300 sixteen 50 80 42
600 900 1000 20 55 150 37

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 900 ° C, oil. Vacation
Sample cutting direction — pr. 100 540−570 800−820 20−23 64−66 100−110
Sample cutting direction — p. 100 470−490 780−810 20 52−60 50−75
Sample cutting direction — pr. 150 500−520 780 20−23 64 90−100
Sample cutting direction — p. 150 480−490 710−780 15−20 36−51 70−90
Sample cutting direction — pr. 250 500−520   18−23 58−65 100−110
Sample cutting direction — p. 250 500−520   16−17 46−51 75
Hardening 900 ° C, water. Vacation.
Sample cutting direction — pr. 100 1000−1020 1190−1230 16−17 43−54 95−120
Sample cutting direction — p. 100 1070−1170 1260−1290 8−10 29−35 75−100
Sample cutting direction — pr. 150 940−980 1160−1170 9−13 26−36 85
Sample cutting direction — p. 150 1030−1050 1090−1150 3−5 9−10 70−90
Sample cutting direction — pr. 250 940−960 1130−1170 15−18 23−41 80−90
Sample cutting direction — p. 250 1000 880−1080 4 7−8 60−75

Mechanical properties additional data

σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HRC e
Section 20 mm. HTMO: deformation temperature 960 ° C, degree of deformation 20%. Vacation 270 ° С, 2 h
1800 ten 45 65 47−51
Hardening 900 ° С, НТМО: 550 ° С, deformation in 3 passes by 63% (25%, 25%, 13% with intermediate heating). Cooling in oil. Vacation 275 ° С, 6 h.
2310     20  

Technological properties of steel 30HGSN2A

Forging temperature
Beginning 1200, end 800. Cooling of sections more than 60 mm slow, less — in air in stacks.
Tendency to release ability
inclined
Flock sensitivity
sensitive

Temperature of critical points of steel 30HGSN2A

Critical point ° C
Ac1 705
Ac3 800
Mn 321

Impact strength of steel 30HGSN2A

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -20 -thirty
Hardening 900 С, oil. Vacation 650 С, exposure 2.5 h, oil 220 120 80

Endurance limit of steel 30HGSN2A

σ -1, MPa n σ B, MPa σ 0.2, MPa Heat treatment, steel condition
505 1E + 7 1770 1600 Normalization, 890 C. Hardening 890 C, oil. Vacation 230 S.

Hardenability of steel 30HGSN2A

Hardening 900 C. Hardness HRCэ.

Distance from the end, mm / HRC e
1.5 3 6 12 eighteen 24 thirty
63 62.5 62 61 61 60.5 60.5

Physical properties of steel 30HGSN2A

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 195     180 168 135        
Torsional shear elastic modulus G, GPa 77     70 65 51        

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