Steel 58 (55пп)

Designation

Name	The value
Designation GOST Cyrillic	58
Designation GOST Latin	58
Transliteration	58
By chemical elements	58

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

Description

58 steel is used: for the manufacture of parts with thin cross sections uprochneniya elements — gear of the middle module, bushings, plates and other parts; after surface hardening with heating HDTV — details, requirements high wear resistance in the viscous core operating at large speeds and medium specific pressures; automotive components.

Note

The degree of deoxidation — SP.
Steel with low hardenability.

Standards

Name	Code	Standards
Bars and shapes	В32	GOST 1050-88, GOST 7417-75, GOST 8559-75, GOST 14955-77, GOST 1050-2013, TU 14-1-5414-2001, TU 14-1-1926-76, TU 14-1-2118-77, TU 14-170-110-90, TU 14-11-245-88, TU 14-136-367-2008
Sheets and strips	В23	GOST 14918-80, GOST 103-2006
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
Steel wire medium and high carbon	В72	GOST 3920-70, GOST 7372-79, GOST 9389-75, GOST 9850-72, GOST 26366-84
Bars and shapes	В22	GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
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	0.55-0.63	≤0.04	≤0.035	≤0.2	≤0.15	0.1-0.3	≤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	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HRC
Rolled sheet. Annealing 850 °C (the speed of induction heating 30 °C/s) cooling water shower + Vacation at 180 °C (delay of 1,5 hours)
≤6	1900-2100	2100-2300	3-5	25-30	196-392	58-69
Bars hot rolled on the other 14-1-1926-76. Normalization at 840-860 °C, air cooling
	≥314	≥598	≥12	≥28	-	-
Rolled steel. Normalization at 850 °C
≤130	≥300	≥600	≥10	≥25	≥343	≥22
Steel, hot-rolled, forged, calibrated and silverfish 2nd category. Normalization at 850 °C
≤25	≥315	≥600	≥12	≥28	-	-

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
y	The relative narrowing
KCU	Toughness
HRC	Rockwell hardness (indenter diamond spheroconical)

Technological properties

Name	The value
Weldability	Not priymayutsya for welded structures.
Склонность к отпускной хрупкости	Tend not.
The temperature of forging	Start - 1265 °C, the end - 1080 °C.
Flock-sensitive sensitivity	not sensitive.
Microstructure	Rentals on the other 14-1-1926-76 comes with a normalized value of the austenite grain, which size should be not larger than 5 numbers according to GOST 5639.