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Steel 75

Description

Steel 75

Steel 75: a 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 75 grade.

General steel 75

Substitute brand
steel: 70, 80, 85.
Delivery type
Long products, including shaped: GOST 14959−79, GOST 2590−71, GOST 2591−71, GOST 2879−69, GOST 7419.0−78, GOST 7419.1−78, GOST 7419.3−78, GOST 7419.5−78 — GOST 7419.8 -78. Calibrated bar GOST 7417−75, GOST 8559−75, GOST 8560−78. Polished bar and silver bar GOST 14955−77, GOST 7419.0−78, GOST 7419.1−78, GOST 7419.3−78, GOST 7419.5−78 — GOST 7419.8−78. Strip GOST 103−76, GOST 4405−75, GOST 82−70, GOST 7419.2−78, GOST 7419.4−78. Forgings and forged billets GOST 1133−71.
Application
round and flat springs of various sizes, car engine valve springs, shock absorber springs, springs, lock washers, clutch discs, eccentrics, spindles, shims and other parts operating under friction and under static and vibration loads.

Chemical composition of steel 75

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.50−0.80
Copper (Cu), no more 0.20
Nickel (Ni), no more 0.25
Sulfur (S), no more 0.035
Carbon (C) 0.72−0.80
Phosphorus (P), no more 0.035
Chromium (Cr), no more 0.25

Mechanical properties of steel 75

Mechanical properties

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,%
Steel categories: 3.3A, 3B, 3V, 3G, 4.4A, 4B. Hardening 820 ° С, oil, tempering 470 ° С. Samples 885 1080 nine thirty

Technological properties of steel 75

Forging temperature
Beginning 1180, end 800. Sections up to 220 mm are cooled in wells.
Weldability
not applicable for welded structures. KTS with subsequent heat treatment.
Tendency to release ability
not inclined
Flock sensitivity
insensitive

Temperature of critical points of steel 75

Critical point ° C
Ac1 720
Ac3 735
Ar1 700

Endurance limit steel 75

σ -1, MPa τ -1, MPa σ B, MPa σ 0.2, MPa Heat treatment, steel condition
392   1080 880  
  343−392     Hardening 820 С, oil, tempering 480 С, air.

Physical properties of steel 75

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 191                  
Torsional shear elastic modulus G, GPa 78                  

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