Steel 30

Designation

Name	The value
Designation GOST Cyrillic	30
Designation GOST Latin	30
Transliteration	30
By chemical elements	30

Description

Steel 30 is used: for the manufacture of sheet metal, 1−2 mm 4−14 category, intended for cold forming; rods, earrings, traverse, levers, shafts, sprockets, spindles, cylinders, pressure equipment, couplings and other parts of low strength; hot wing profile for ploskorez agricultural machines; wire used for the manufacture of spokes of motorcycles and bicycles.

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 10702-78, GOST 14955-77, GOST 1050-2013, TU 14-1-5414-2001, TU 14-1-1209-74, TU 14-1-2118-77, TU 14-1-4057-86, TU 14-1-701-73, TU 14-1-866-74, TU 14-11-245-88, TU 14-1-1271-75, TU 14-1-5228-93, TU 14-136-367-2008
Bars and shapes	В22	GOST 1133-71, 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 12492.9-90, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006, OST 5.9087-84
Sheets and strips	В33	GOST 1577-93, GOST 4041-71, TU 14-1-4516-88
Tape	В34	GOST 2284-79, GOST 10234-77
Steel wire medium and high carbon	В72	GOST 3110-74, GOST 3920-70, GOST 7372-79, GOST 9389-75, GOST 9850-72, GOST 17305-91, GOST 26366-84
Steel pipes and fittings to them	В62	GOST 3262-75, GOST 20295-85, GOST 24950-81, TU 14-3-1428-86, TU 14-3-747-78, TU 14-3-1303-84
Tape	В24	GOST 3560-73
Low carbon steel wire	В71	GOST 5663-79
Sheets and strips	В23	GOST 82-70, GOST 14918-80, GOST 16523-97, GOST 16523-89, GOST 16523-70, GOST 103-2006, GOST 19903-90, TU 14-1-1934-76, TU 14-1-4632-93
Processing of metals by pressure. Forgings	В03	GOST 8479-70, ST ЦКБА 010-2004
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	0.27-0.35	≤0.04	≤0.035	0.5-0.8	≤0.25	0.17-0.37	≤0.3	Rest	≤0.3	≤0.006	≤0.08
GOST 10702-78	0.27-0.35	≤0.04	≤0.035	≤0.6	≤0.25	≤0.2	≤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	d	d₁₀	y, %	KCU, kJ/m²	HB, MPa	HRB
Tape flatted average strength of 0.1-4.0 mm according to GOST 10234-77 in the state of delivery (indicated delivery)
-	-	-	640-930	-	-	-	-	-	-	-	-
-	-	-	640-780	-	-	-	-	-	-	-	-
-	-	-	780-930	-	-	-	-	-	-	-	-
-	-	-	≤590	-	-	≥15	-	-	-	-	-
-	-	-	≤470	-	-	-	-	-	-	-	-
Rolled sheet 1-2 categories of heat-treated (annealing, normalization, high tempering or normalizing + tempering) in the delivery state according to GOST 4041-71
4-14	-	-	430-590	≥24	-	-	≥21	-	-	≤149	≤80
Wire for cold heading as supplied by GOST 5663-79
-	-	-	560-710	-	-	-	-	≥55	-	-	-
-	-	-	≤740	-	-	-	-	≥45	-	-	-
Hot-rolled steel and hot rolled with special surface finish
-	-	-	-	-	-	-	-	-	-	≤179	-
-	-	-	-	-	-	-	-	-	-	≤156	-
Steel calibrated and calibrated with special surface finish
-	-	-	≥560	≥7	-	-	-	≥40	-	≤229	-
-	-	-	≤570	-	-	-	-	≥45	-	≤179	-
-	-	-	≤520	-	-	-	-	≥45	-	≤179	-
Long products
-	-	≥320	≥530	≥25	-	-	-	≥52	-	-	-
-	-	≥205	≥580	≥21	-	-	-	≥51	-	-	-
-	-	≥145	≥350	≥24	-	-	-	≥70	-	-	-
-	-	≥78	≥195	≥35	-	-	-	≥83	-	-	-
Tape
0.1-4	-	-	650-850	-	-	-	-	-	-	-	-
0.1-4	-	-	400-650	-	≥16	-	-	-	-	-	-
Cold-rolled steel strip of 0.1-4.0 mm in the delivery state according to GOST 2284-79
-	-	-	640-930	-	-	-	-	-	-	-	-
-	-	-	390-640	-	≥16	-	-	-	-	-	-
-	-	-	390-590	-	≥16	-	-	-	-	-	-
Steel grooved 5-th category
-	-	-	≥560	≥7	-	-	-	≥35	-	-	-
-	-	-	≤440	≥17	-	-	-	≥45	-	-	-
Forgings. Normalization
300-500	-	≥175	≥350	≥22	-	-	-	≥45	≥530	101-143	-
100-300	-	≥195	≥390	≥23	-	-	-	≥50	≥530	111-156	-
300-500	-	≥195	≥390	≥20	-	-	-	≥45	≥481	111-156	-
500-800	-	≥195	≥390	≥18	-	-	-	≥38	≥432	111-156	-
100-300	-	≥215	≥430	≥20	-	-	-	≥48	≥481	123-167	-
300-500	-	≥215	≥430	≥18	-	-	-	≥40	≥432	123-167	-
500-800	-	≥215	≥430	≥16	-	-	-	≥35	≥383	123-167	-
100-300	-	≥245	≥470	≥19	-	-	-	≥42	≥383	143-179	-
300-500	-	≥245	≥470	≥17	-	-	-	≥35	≥334	143-179	-
100	-	≥245	≥470	≥22	-	-	-	≥48	≥481	143-179	-
Hot-rolled sheet in the delivery condition. Group strength К390В
≤2	-	-	390-590	-	≥19	-	-	-	-	-	-
2-3.9	-	-	390-590	-	≥20	-	-	-	-	-	-
Cold-rolled sheet in the delivery condition. Group strength К390В
≤2	-	-	390-590	-	≥20	-	-	-	-	-	-
2-3.9	-	-	390-590	-	≥21	-	-	-	-	-	-
The normalized or hot rolled strip products, long products, hot-rolled, kalibrovsky and silverfish 2nd category after normalization, forged billet
6-25	-	290-295	≥490	≥21	-	-	-	≥50	-	-	-
Rolled steel in the delivery state
-	-	≥320	≥530	≥25	-	-	-	≥52	≥608	-	-
Sheet 1 and 2 categories of heat-treated
4-14	-	-	430-590	≥24	-	-	-	-	-	≤149	-
Sheets of annealed or vysokoopasnye
80	-	-	430	≥24	-	-	-	-	-	-	-
Rolled steel. Quenching in water from 860 °C
60	400	420-490	560-680	16-24	-	-	-	53-64	-	153-189	-
60	500	390-440	540-630	18-27	-	-	-	61-68	-	150-175	-
60	600	350-390	490-570	21-28	-	-	-	66-72	-	138-158	-
The sample is diameter 5 mm, length 25 mm, deformed. The rate of deformation of 10 mm/min strain Rate 0,007 1/C
-	-	-	≥98	≥49	-	-	-	≥98	-	-	-
-	-	-	≥77	≥53	-	-	-	≥100	-	-	-
-	-	-	≥48	≥56	-	-	-	≥100	-	-	-
-	-	-	≥30	≥58	-	-	-	≥100	-	-	-
-	-	-	≥21	≥64	-	-	-	≥100	-	-	-

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
d	Elongation after rupture
d₁₀	Elongation after rupture
y	The relative narrowing
KCU	Toughness
HB	Brinell hardness number
HRB	Rockwell hardness (indenter steel, spherical)

Physical characteristics

Temperature	Е, HPa	G, HPa	r, kg/m³	l, W/(m · °C)	a, 10^-6 1/°C	С, J/(kg · °C)
0	200	78	7850	52	-	-
200	191	76	-	49	129	483
300	185	73	-	46	136	546
600	164	59	-	36	15	-
400	-	69	-	43	142	563
500	-	66	-	39	147	563
700	-	-	-	32	15	764

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
С	Specific heat

Technological properties

Name	The value
Weldability	Limited weldability. The welding methods of SMAW, ADS submerged arc and gas protection electroslag welding. Recommended heating and subsequent heat treatment. The CCC without restriction.
Склонность к отпускной хрупкости	Tend not.
The temperature of forging	Start - 1280 °C, the end - 750 °C. the Workpiece cross-section up to 800 mm are cooled in air.
Flock-sensitive sensitivity	not sensitive.
Machinability	In the hot rolled condition when blower SB 143 and HB=460 MPa Kn TV.SPL.=1,7.