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 sT|s0,2, MPa σU, 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 -
500-800 - ≥175 ≥350 ≥20 - - - ≥40 ≥481 101-143 -
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
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
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.