Steel 55

Designation

Name The value
Designation GOST Cyrillic 55
Designation GOST Latin 55
Transliteration 55
By chemical elements 55

Description

55 steel is used: for the manufacture of blanks after normalization with the release or quenching with the release of gears, rolls, rods, heavy-duty axles, tires, light duty springs and leaf springs, coulters, finger track links, couplings gear boxes, housings of the injectors and other parts operating friction; solid-rolled rings for different purposes; hardened and tempered carded a round wire and shaped steel used for the manufacture of brackets needle products; tinned wire for the manufacture of tires rotors of electric machines; remisol heat-treated tin-plated wire, designed for the manufacture of galev to reminyl devices looms.

Note

The degree of deoxidation — SP.

Standards

Name Code Standards
Bars and shapes В32 GOST 1050-88, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST 1050-2013, OST 1 92049-76, TU 14-1-2118-77, TU 14-1-2919-80, TU 14-11-245-88, TU 14-1-1271-75, TU 14-1-5228-93, TU 14-136-367-2008
Fittings, components and parts for railway rolling stock Д55 GOST 11530-93
Sheets and strips В33 GOST 1577-93, TU 14-1-4516-88
Tape В34 GOST 2284-79
Steel pipes and fittings to them В62 GOST 3262-75, GOST 20295-85, GOST 24950-81, TU 14-3-1428-86
Tape В24 GOST 3560-73
Low carbon steel wire В71 GOST 3875-83
Steel wire medium and high carbon В72 GOST 3920-70, GOST 7372-79, GOST 9124-85, GOST 9161-85, GOST 9389-75, GOST 9850-72, GOST 26366-84
Machines and equipment for metallurgical and foundry industry Г44 GOST 5399-69
Sheets and strips В23 GOST 82-70, GOST 14918-80, GOST 19903-74, GOST 103-2006, GOST 19903-90
Bars and shapes В22 GOST 8239-89, GOST 8240-97, GOST 8278-83, GOST 8281-80, GOST 8282-83, GOST 8283-93, GOST 8319.0-75, GOST 8509-93, GOST 8510-86, GOST 9234-74, GOST 11474-76, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006, OST 5.9087-84
Processing of metals by pressure. Forgings В03 GOST 8479-70
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-4944-90

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu N As
GOST 1050-88 0.52-0.6 ≤0.04 ≤0.035 0.5-0.8 ≤0.25 0.17-0.37 ≤0.3 Rest ≤0.3 ≤0.006 ≤0.08
Fe is the basis.
According to GOST 1050-88, the nitrogen content is specified for the steel of the oxygen-converter method of smelting. For all other types of smelting, the nitrogen content was N≤0.008%.

Mechanical properties

Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % d4 y, % KCU, kJ/m2 HB, MPa HRC
Cold-rolled steel strip of 0.1-4.0 mm in the delivery state according to GOST 2284-79
- - - 740-1080 - - - - - -
- - - 440-740 - ≥13 - - - -
- - - 440-610 - ≥13 - - - -
Ring forged in OST 1 92049-76. Normalization
25 - ≥365 ≥610 ≥8 - ≥28 - - -
Forgings. Hardening + Vacation
1000 - 490 655 16 - 45 579 212-248 -
Carden wire 0.2-0.8 mm as supplied by GOST 3875-83 (samples)
- - - 1770-1960 - - - - - -
- - - 1961-2160 - - - - - -
Forgings. Normalization at 830-860 °C, air cooling + Vacation at 550-600 °C, cooling with furnace or air
1200 - - - - - - - 215-255 -
Forgings. Normalization at 830-860 °C, air cooling + Vacation at 650-800 °C, cooling with the furnace
101-300 - ≥315 ≥630 ≥11 - ≥28 ≥245 170-229 -
301-500 - ≥305 ≥610 ≥10 - ≥25 ≥245 - -
100 - ≥325 ≥650 ≥12 - ≥35 ≥285 - -
Long products (samples). Quenching in water 840 °C + Vacation at 400 °C, air cooling
20 - 870-990 1060-1210 7-8 - 43-52 530-657 341 -
40 - 640-740 900-1000 10-11 - 43-47 383-520 290 -
60 - 590-650 820-930 10-12 - 42-46 314-481 266 -
Long products (samples). Quenching in water 840 °C to + Leave at 500 °C, air cooling
20 - 710-800 900-1000 10-12 - 53-59 579-961 285 -
40 - 550-610 820-900 12-14 - 45-52 481-677 264 -
60 - 510-570 750-850 13-14 - 43-52 383-579 239 -
Forgings. Normalization + High holidays
100-300 - 315 570 14 - 35 334 167-207 -
Rolled steel. Quenching in oil from 840 °C to + Vacation
- 200 1620-2210 1720-2280 2-3 - 7-12 49-98 - 64
- 300 1350-1790 1500-1940 3-4 - 20-25 49-98 - 56
- 400 1100-1380 1260-1590 4-5 - 31-36 186-481 - 47
- 500 820-1000 970-1120 7 - 41-45 383-765 - 40
- 600 600-700 800-890 10-11 - 51-54 677-1059 - 30

Description mechanical marks

Name Description
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d5 Elongation after rupture
d4 Elongation after rupture
y The relative narrowing
KCU Toughness
HB Brinell hardness number
HRC Rockwell hardness (indenter diamond spheroconical)

Physical characteristics

Temperature Е, HPa r, kg/m3 l, W/(m · °C) a, 10-6 1/°C С, J/(kg · °C)
0 210 7280 - - -
100 - - 68 11 479
1000 - - - 135 -

A description of the physical symbols

Name Description
Е The normal elasticity modulus
G Modulus of elasticity shear torsion
r Density
l Coefficient of thermal conductivity
R UD. the resistivity
a The coefficient of linear expansion

Technological properties

Name The value
Weldability Does not apply to welded structures. The CCC followed by heat treatment.
Склонность к отпускной хрупкости Tend not.
The temperature of forging Start - 1240 °C, the end - of 800 °C. the cross Sections up to 400 mm are cooled in air.
Flock-sensitive sensitivity Insensitive.
Machinability In hot-rolled state when HB 255-269 and blower SB=630 MPa Kn TV.SPL.=0,65 Kn b.St.=0,33.