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Steel 70

Description

Steel 70

Steel 70: 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 70 grade.

General steel 70

Substitute brand
steel 65G.
Delivery type
Circle 70, rolled sections, 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. Tape GOST 1530−78, GOST 2284−79, GOST 219969−76, GOST 21997−76. Strip GOST 4405−75, GOST 82−70, GOST 7419.2−78, GOST 7419.4−78. Forgings and forged billets GOST 1133−71. Wire GOST 9389−75. Thick sheet GOST 1577−81, GOST 19903−74.
Application
springs, springs and other parts that require increased strength and elastic properties, as well as wear resistance.

Chemical composition of steel 70

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) 0.67−0.75
Phosphorus (P), no more 0.035
Chromium (Cr), no more 0.25

Mechanical properties of 70 steel

Mechanical properties

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% HB
Steel categories: 3.3A, 3B, 3V, 3G, 4.4A, 4B. Hardening 830 ° С, oil, tempering 470 ° С. Samples 835 1030 nine thirty  
Normalization   510 910 17 29 252
Wire. Hardening 920 ° С, cooling in oil at 40 ° С, holding for 1 min. Vacation 500 ° С, exposure 15 min. 6.5   1240 7 47 315

Technological properties of steel 70

Forging temperature
The beginning is 1200, the end is 850.
Weldability
not applicable for welded structures. KTS with subsequent heat treatment.
Machinability by cutting
at HB 183−241, K υ tv.spl. = 0.7, K υ b.st. = 0.6.
Tendency to release ability
not inclined
Flock sensitivity
insensitive

Temperature of critical points of steel 70

Critical point ° C
Ac1 730
Ac3 743
Ar3 727
Ar1 693

Physical properties of steel 70

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 206                  
Torsional shear elastic modulus G, GPa 78                  
Density of steel, pn, kg / m 3 7810                  
Thermal conductivity coefficient W / (m ° С)   68 52 37 29          
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) 11.5 12.3 13.0 13.8            
Specific heat (C, J / (kg ° C)) 483 487   521   567        

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