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	s_T\|s_0,2, MPa	σ_U, 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
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_U	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.