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Steel 40 (40A)

Designation

Name The value
Designation GOST Cyrillic 40
Designation GOST Latin 40
Transliteration 40
The chemical elements 40
Name The value
Designation GOST Cyrillic 40А
Designation GOST Latin 40A
Transliteration 40A
The chemical elements 40

Description

40 steel is used: for the manufacture of sheet metal, 1−2 mm 4−14 category, intended for cold forming; crankshafts, connecting rods, gear rims, flywheels, gears, bolts, axles and other parts after the improvement; shafts and extension shafts of the generators; medium sized workpieces, which are requirements of high surface hardness and high wear resistance at low strain (long shafts, chassis, rollers, gears) after surface hardening with heating HDTV; details of pipeline valves after quenching and tempering; hot-rolled strip profile with a bias for agricultural machinery; of forgings of shafts of compressors and gas turbines (steel 40A); the wire used for the manufacture of spokes of motorcycles and bicycles.

Note

The degree of deoxidation — SP.

Standards

Name Code Standards
Sectional and shaped rolling 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 14-1-1629-76, TU 14-1-2118-77, TU 14-1-495-73, TU 14-1-701-73, TU 14-1-866-74, TU 14-11-245-88, STP М323-80, TU 14-1-2252-2007, TU 14-1-1271-75, TU 14-1-5228-93, TU 14-136-367-2008
Sectional and shaped rolling 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 8319.5-75, GOST 8319.8-75, GOST 8319.11-75, GOST 8319.12-75, GOST 8509-93, GOST 8510-86, GOST 9234-74, GOST 11474-76, GOST 12492.15-90, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006, OST 5.9087-84, STP М326-80
Armature, units and details of rolling stock of railways Д55 GOST 11530-93
Sheets and stripes В33 GOST 1577-93, GOST 4041-71, TU 14-125-661-93, TU 14-1-4516-88, TU 114-125-661-93
Tapes 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
Pipes steel and connecting parts to them В62 GOST 3262-75, GOST 20295-85, GOST 24950-81, TU 14-3-1428-86
Tapes В24 GOST 3560-73
Low-carbon steel wire В71 GOST 5663-79
Sheets and stripes В23 GOST 82-70, GOST 14918-80, GOST 16523-97, GOST 16523-89, GOST 16523-70, GOST 103-2006, GOST 19903-90, TU 14-1-486-73, TU 14-1-1934-76, TU 14-1-4632-93
Metal forming. Forgings В03 GOST 8479-70, TU 302.02.173-93, TU НЗЛ 342-89, ST ЦКБА 010-2004
Bulls. Blanks. Slabs В31 OST 3-1686-90, TU 108.11.890-87, TU 14-1-4944-90, STP М322-90
Thermal and thermochemical treatment of metals В04 ST ЦКБА 026-2005

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu
TU НЗЛ 342-89 0.37-0.45 ≤0.03 ≤0.03 0.5-0.8 ≤0.25 0.17-0.37 ≤0.3 The rest ≤0.3
Fe is the basis.
According to GOST 1050-88 and GOST 10702-78 the chemical composition is given for steel grade 40.
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%.
TU NZL 342-89 chemical composition is given for steel grade 40A.

Mechanical characteristics

Section, mm t отпуска, °C sT|s0,2, MPa σB, MPa d5, % d4 d d10 y, % kJ/m2, кДж/м2 Brinell hardness number, MPa HRB
Tape flatted average strength of 0.1-4.0 mm according to GOST 10234-77 in the state of delivery (indicated delivery)
- - - 640-980 - - - - - - - -
- - - 640-780 - - - - - - - -
- - - 780-930 - - - - - - - -
- - - ≤690 - - ≥10 - - - - -
- - - ≤490 - - - - - - - -
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 - - 510-660 ≥21 - - ≥17 - - ≤167 ≤85
Wire for cold heading as supplied by GOST 5663-79
- - - 560-710 - - - - ≥55 - - -
- - - ≤740 - - - - ≥40 - - -
Hot-rolled steel and hot rolled with special surface finish
- - - - - - - - - - ≤217 -
- - - - - - - - - - ≤163 -
Steel calibrated and calibrated with special surface finish
- - - - - - - - - - ≤217 -
- - - ≤590 - - - - - - ≤197 -
Sheet
80 - - ≥560 ≥20 - - - - - - -
80 - - ≥520 ≥21 - - - - - - -
4-14 - - 510-650 ≥21 - - - - - ≤167 -
Tape
0.1-4 - - 450-700 - ≥14 - - - - - -
0.1-4 - - 850-1050 - - - - - - - -
Cold-rolled steel strip of 0.1-4.0 mm in the delivery state according to GOST 2284-79
- - - 690-1030 - - - - - - - -
- - - 440-690 - ≥14 - - - - - -
- - - 440-600 - ≥14 - - - - - -
Steel grooved 5-th category
- - - ≥610 ≥6 - - - ≥35 - - -
- - - ≥510 ≥14 - - - ≥40 - - -
Forgings. Hardening + Vacation
300-500 - ≥275 ≥530 ≥15 - - - ≥32 ≥290 156-197 -
500-800 - ≥275 ≥530 ≥13 - - - ≥30 ≥290 156-197 -
100-300 - ≥315 ≥570 ≥14 - - - ≥35 ≥340 167-207 -
100 - ≥345 ≥590 ≥18 - - - ≥45 ≥590 174-217 -
Forgings. Normalization
300-500 - ≥215 ≥430 ≥18 - - - ≥40 ≥440 123-167 -
500-800 - ≥215 ≥430 ≥16 - - - ≥35 ≥390 123-167 -
100-300 - ≥245 ≥470 ≥19 - - - ≥42 ≥390 143-179 -
300-500 - ≥245 ≥470 ≥17 - - - ≥35 ≥340 143-179 -
100-300 - ≥275 ≥530 ≥17 - - - ≥38 ≥340 156-197 -
100 - ≥275 ≥530 ≥20 - - - ≥40 ≥440 156-197 -
Hot-rolled sheet in the delivery condition. Group strength К490В
≤2 - - 490-720 - ≥12 - - - - - -
2-3.9 - - 490-720 - ≥13 - - - - - -
Cold-rolled sheet in the delivery condition. Group strength К490В
≤2 - - 490-720 - ≥13 - - - - - -
2-3.9 - - 490-720 - ≥14 - - - - - -
Forged billet shafts of compressors and gas turbines, heat-treated in the delivery condition on the other NZL 342-89 (longitudinal samples, in the column of the delivery condition specified strength)
≤400 - ≥274 ≥509 ≥17 - - - ≥35 ≥343 - -
Rolled without heat treatment - delivery condition
60 - - ≥570 ≥20 - - - - - - -
6-25 - - ≥570 ≥19 - - - ≥45 - - -
80 - ≥340 ≥580 ≥19 - - - ≥45 ≥589 - -
- - ≥340 ≥600 ≥16 - - - - - - -
- - ≥320 ≥580 ≥17 - - - - - - -
Rolled steel and punching. Quenching in water from 830-850 °C (exposure for 2.5-4.0 hours depending on the thickness and weight of the workpiece) + Vacation
≤100 580-640 ≥345 ≥590 ≥18 - - - ≥45 ≥588 174-217 -
Rolled steel and punching. Annealing in air from 870-890 °C (exposure for 2.5-4.0 hours depending on the thickness and weight of the workpiece)
≤300 - ≥275 ≥530 ≥17 - - - ≥38 ≥343 156-197 -
Steel, hot-rolled, forged, calibrated and silverfish 2nd category after normalization
≤25 - - ≥570 ≥19 - - - ≥45 ≥579 - -
Rolled steel. Hardening + Vacation
- 200 ≥750 ≥930 ≥7 - - - ≥45 - ≥267 -
- 300 ≥710 ≥860 ≥8 - - - ≥51 - ≥247 -
- 400 ≥640 ≥790 ≥10 - - - ≥57 - ≥225 -
- 500 ≥550 ≥730 ≥12 - - - ≥62 - ≥208 -
- 600 ≥450 ≥660 ≥16 - - - ≥66 - ≥188 -
- 700 ≥380 ≥620 ≥17 - - - ≥71 - ≥170 -
A sample with a diameter of 6 mm and a length of 30 mm, laminated. Strain rate 16 mm/min strain Rate of 0.009 1/s
- - ≥99 ≥140 ≥48 - - - ≥85 - - -
- - ≥70 ≥110 ≥53 - - - ≥97 - - -
- - ≥54 ≥71 ≥55 - - - ≥100 - - -
- - ≥28 ≥58 ≥69 - - - ≥100 - - -
- - ≥24 ≥37 ≥60 - - - ≥100 - - -
- - ≥16 ≥26 ≥87 - - - ≥100 - - -
- - ≥12 ≥18 ≥56 - - - ≥100 - - -

Description mechanical marks

Name Description
Section Section
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σB Limit short-term strength
d5 Elongation after rupture
d4 Elongation after rupture
d Elongation after rupture
d10 Elongation after rupture
y The relative narrowing
kJ/m2 Toughness
HRB Rockwell hardness (indenter steel, spherical)

Physical characteristics

Temperature Е, ГПа G, ГПа r, кг/м3 l, Вт/(м · °С) R, НОм · м a, 10-6 1/°С С, Дж/(кг · °С)
0 212 82 7850 - - - -
20 213 - 7850 515 160 - 483
100 206 80 - 51 221 119 486
200 201 78 - 48 296 128 497
300 192 75 - 46 387 135 512
400 176 68 - 42 493 141 529
500 163 63 - 38 619 146 550
600 151 58 - 34 766 149 574
700 131 50 - 30 932 152 628
800 118 45 - 25 1110 125 674
900 - - - 26 1150 135 657
1000 - - - 269 1180 135 657
1100 - - - 28 1207 152 649
1200 - - - 295 1230 145 653

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.
Propensity to temper brittleness Tend not.
Forging temperature Start - 1250 °C, the end - of 800 °C. the cooling of the workpiece cross-section up to 400 mm in air.
Flock-sensitive sensitivity not sensitive.
Workability by cutting In the hot rolled condition with a HB of 170 and blower SB=520 MPa Kn TV.SPL.=1.2 Kn b.St.=1.05
Surfacing Surfacing of sealing surfaces of valves in accordance with OST 26-07-2028-81 is made by manual arc welding electrodes type e-20X13 with plaster SSSI-13НЖ, NII-48, NII-48Ж-1 or SV wire-12H13 or SV-20X13. Surface preparation for overlay welding is performed by machining. Surfacing is performed with preliminary and accompanying heating to 400-450 °C is not less than 3 layers with thickness not less than 4 mm, excluding allowance for machining. Heat treatment after welding is produced by tempering at 550-600 °C (delay of 2-5 h) hardness HB=301-350, at 600-650 °C (delay of 2-5 h) hardness HB=240 to 300, at 400-450 °C (delay of 2-5 h) hardness HB=351-400. The temperature of the furnace when loading the details for the home should be no more than 300 °C.

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