Steel 30HGSA


Material 35HGSA Chelyabinsk

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35ХГСА

  • Products made of steel 35HGSA in stock:
    Circle
  • Band
  • Square
  • Forging

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High-quality structural alloy steel 35KhGSA

Substitutes: Steel 30KhGT, Steel 30KhGS, Steel 30KhGSA, Steel 35KhM

Steel 35KhGSA is used: for the production of hot-rolled plates; flanges, cams, pins, rollers, levers, axles, parts of welded structures and other upgradeable parts of complex configuration operating under alternating loads.

Specifications

Chemical composition in%
NTDCSPMnCrWVTiSiNiMoCu
TU 14-1-4118-86, GOST 4543-710,32-0,39≤0,025≤0,0250,80-1,101,10-1,40≤0,20≤0,050≤0,0301,10-1,40≤0,30≤0,15≤0,30

According to GOST 4543-71, the content in especially high-quality steel is regulated: P≤0.025%; S≤0.015%; Сu≤0.25%.

Mechanical properties
Mechanical properties at 20°C
Delivery statusSection (mm)t test
(°C)
holiday temperature
(°C)
sТ |
s0.2 (MPa)
sB
(MPa)
d5
(%)
d4dd10y
(%)
KCU
(kJ/m2)
HBH.R.C.HRBH.V.HSh
Samples for mechanical testing. Isothermal hardening at 880 °C in a mixture of potassium and sodium nitrate having a temperature of 280-310 °C, cooling in air
≥1270≥1620≥9≥40≥383
Forgings. Quenching in air from 880 °C + Tempering at 500 °C, cooling in air
100-300≥490≥660≥13≥40≥530
Mechanical properties depending on the section
Delivery statusSection
(mm)
t test
(°C)
holiday temperature
(°C)
sТ |
s0.2 (MPa)
sB
(MPa)
d5
(%)
d4dd10y
(%)
KCU
(kJ/m2)
HBH.R.C.HRBH.V.HSh
Long products. Quenching in oil from 880 °C + Tempering at 500 °C, cooling in water (longitudinal samples)
10-20≥1000≥1110≥12≥54≥322
20-40≥940≥1080≥11≥50≥310
40-60≥860≥960≥11≥46≥270
Long products. Quenching in oil from 880 °C + Tempering at 600 °C, cooling in water (longitudinal samples)
20-40≥810≥970≥14≥58≥280
40-60≥780≥880≥13≥58≥250
Mechanical properties of the rod
Delivery statusSection
(mm)
t test
(°C)
holiday temperature
(°C)
sТ |
s0.2 (MPa)
sB
(MPa)
d5
(%)
d4dd10y
(%)
KCU
(kJ/m2)
HBH.R.C.HRBH.V.HSh
Steel, calibrated and calibrated with special surface finishing, hot-rolled and hot-rolled with special surface finishing
Heat treated (annealed)≤241
Mechanical properties depending on the forging cross-section and heat treatment mode
Delivery statusSection
(mm)
t test
(°C)
holiday temperature
(°C)
sТ |
s0.2 (MPa)
sB
(MPa)
d5
(%)
d4dd10y
(%)
KCU
(kJ/m2)
HBH.R.C.HRBH.V.HSh
Forgings. Quenching + Tempering
KP 490100-300≥490≥660≥13≥40≥530212-248
KP 540100-300≥540≥690≥13≥40≥481223-262
KP 590≤100≥590≥730≥14≥45≥579235-277
KP 640≤100≥640≥780≥13≥42≥579248-293
Mechanical properties depending on tempering temperature
Delivery statusSection
(mm)
t test
(°C)
holiday temperature
(°C)
sТ |
s0.2 (MPa)
sB
(MPa)
d5
(%)
d4dd10y
(%)
KCU
(kJ/m2)
HBH.R.C.HRBH.V.HSh
Long products. Quenching in oil from 880 °C + Tempering
200≥1570≥1910≥12≥48≥481≥52
300≥1550≥1760≥12≥50≥579≥50
400≥1420≥1620≥12≥51≥432≥47
500≥1180≥1300≥14≥52≥432≥42
Long products. Isothermal hardening from 880 °C to saltpeter having a temperature of 300 °C
Without departure≥1460≥1670≥12≥52≥687≥50
300≥1450≥1670≥12≥55≥697≥50
400≥1410≥1570≥14≥54≥520≥48
500≥1220≥1330≥14≥53≥383≥43
Mechanical properties at elevated temperatures
Delivery statusSection
(mm)
t test
(°C)
holiday temperature
(°C)
sТ |
s0.2 (MPa)
sB
(MPa)
d5
(%)
d4dd10y
(%)
KCU
(kJ/m2)
HBH.R.C.HRBH.V.HSh
Long products. Quenching in oil from 880 °C + Tempering at 500 °C, cooling in water or oil
20≥1200≥1300≥11≥52
250≥1260≥12≥57
400≥1000≥14≥72
500≥540≥31≥70
Technological properties
MachinabilityIn the hot-rolled state at HB 207-217 sB = 710 MPa Kn solid alloy = 0.85 Kn b.st. = 0.75.
WeldabilityLimited weldability. Welding methods: RDS, ADS submerged arc and gas shield, ArDS. Heating is recommended and subsequent heat treatment is required, CTS without restrictions.
Tendency to temper brittlenessProne.
Forging temperatureStart - 1250 °C, end - 860-880 °C. Sections up to 100 mm are cooled in air, 101-200 mm - in a mold, 201-300 mm - with a furnace.
Flock sensitivitySensitive.
Critical point temperature
Critical pointTemperature °C
AC1760
AC3830
AR3705
AR1670
MN352
Impact strength
Delivery condition temperature-40-60
Quenching in oil from 880 °C + tempering at 200 °C, air cooling≥481≥383
Quenching in oil from 880 °C + tempering at 300 °C, air cooling≥481≥383
Quenching in oil from 880 °C + tempering at 400 °C, air cooling≥383≥285
Isothermal hardening from 880 °C (in saltpeter 300 °C) + tempering at 300 °C (holding 1 hour), air cooling≥608≥520
Isothermal hardening from 880 °C (in nitrate 300 °C) + tempering at 400 °C (holding 1 hour), air cooling≥471≥363
Hardenability

Distance from the end, mm/HRCе

1.534.5691215182430
50.5-5049-5447.5-5346-52.541.5-5238-5136.5-48.535-46.530-4325-40.5
Heat treatmentAmount of martensite, %Crete. dia. in water Crete. dia. In oil Crete. hardness, HRCе Dist. from the cooled end, mm
604047
602051
Physical properties
Test temperature, °C020100200300400500600700800
Modulus of normal elasticity (E, GPa)215215211203195185175165144125
Modulus of elasticity under torsional shear (G, GPa)84838279757166625447
Density (r, kg/m3)78507850783078007760773077007670
Thermal conductivity coefficient (l, W/(m °C))38383837373634333130
Ud. electrical resistance (R, NΩ m) 210210
Linear expansion coefficient (a, 10-6 1/°С)11,712,312,913,413,714,014,314,3
Specific heat capacity (C, J/(kg °C))496504512535585620625695
Designations
Mechanical properties:
  • sв — Short-term strength limit, [MPa]
  • sT — Yield strength, [MPa]
  • s0.2 - Limit of proportionality (permanent deformation tolerance - 0.2%), [MPa]
  • d5 — Elongation at break, [%]
  • y — Relative narrowing, [%]
  • KCU - Impact strength, [kJ/m2]
  • HB - Brinell hardness, [MPa]
  • HV — Vickers hardness, [MPa]
  • HSh - Shore Hardness, [MPa]

Standards for quality characteristics of brand 35hgsa

The fundamental standards for 35xgsa steel are laid down in GOST 4543-71. Explanation of the marking shows the content of alloying additives in it (in%):

  • carbon – 0.35 (can reach up to 0.39)
  • chrome – 1.1-1.4
  • manganese – 0.8-1.0
  • silicon – 1-1.4
  • nitrogen – about 1.0

GOST allows the presence of other alloying elements in the chemical composition of this brand: silicon, nickel, copper, as well as small amounts of sulfur and phosphorus. Depending on the presence of a substance superior to other additives, steel of group 35 is divided into chromium (35x) or manganese without chromium, chrome-molybdenum-vanadium, etc. Chrome-silicon-manganese steel 35KhGSA can be replaced with medium-alloy structural grades 30KhGS, 30KhGSA, 30KhGT, 35KhM. Among the foreign analogues there are the Bulgarian brand 35ChGSA and the Polish ones - 35HGS, 35HGSA.

Data on the mechanical properties of this metal, obtained at a temperature of 20oC, indicate the strength of steel, since its hardness, impact strength, and short-term strength allow, according to GOST, the grade to be used in the manufacture of parts of complex configurations, in structures with high temperatures, abrasive elements, i.e. e. where the endurance and durability of the metal are needed.

Steel 30KhGSA - structural alloy

Analogs, Substitutes

Substitute steels 40KhFA, 35KhM, 40KhN, 25KhGSA, 35KhGSA.

Interpretation of steel 30KhGSA

The number 30 indicates the average carbon content in hundredths of a percent, i.e. The carbon content in steel is about 0.3%. The letter X indicates the presence of chromium in the steel; the absence of a number after the letter means that the chromium content does not exceed 1.5%. The letter G indicates the presence of manganese in the steel; the absence of a number after the letter means that the manganese content does not exceed 1.5%. The letter C indicates the presence of silicon in the steel; the absence of a number after the letter means that the silicon content does not exceed 1.5%. The letter A at the end of the steel marking means that the steel is high quality.

Application of 30HGSA

Steel 30KhGSA is used for the manufacture of shafts, axles, gears, flanges, casings, blades of compressor machines operating at temperatures up to 200 ° C, levers, pushers, critical welded structures, parts operating under alternating loads, fasteners, parts operating at low temperatures. temperatures.

Weldability

Steel 30KhGSA is weldable to a limited extent. Welding methods: RDS, ADS under submerged arc and gas shield, ArDS, EShS. Preheating and subsequent heat treatment are recommended. KTS (Contact Spot Welding) without restrictions

Characteristics

Electrical resistivity ρ, at 20 °C - 210 nOhm*m

Density ρ kg/cm3 at test temperature, °C

Steel20100200300400500600700800900
30ХГСА7850783078007760773077007670

Thermal conductivity coefficient λ W/(m*K) at test temperature, °C

Steel20100200300400500600700800900
30ХГСА383837373634333130

Specific heat capacity c, J/(kg*K), at test temperature, °C

20-10020-20020-30020-40020-50020-60020-70020-80020-90020-1000
496504512533554584622693

Thermal conductivity coefficient λ, W/(m*K), at test temperature, °C

20100200300400500600700800900
4646413329

Linear expansion coefficient α*106, K-1, at test temperature, °C

20-10020-20020-30020-40020-50020-60020-70020-80020-90020-1000
11,712,312,913,413,714,014,312,9

Modulus of normal elasticity E, GPa, at test temperature, °C

Steel20100200300400500600700800900
30ХГСА215211203196184173164143125

Modulus of elasticity in torsional shear G, GPa, at test temperature °C

Steel20100200300400500600700800900
30ХГСА848279757166625447

Critical point temperature

Ac1Ac3Ar3Ar1Mn
760830705670352

Chemical composition, % (GOST 4345-2016)

SteelCSiMnCrNiMoAlTiVB
30ХГСА0,28-0,340,90-1,200,80-1,100,80-1,10

According to GOST 4345-2016, the mass fraction of nitrogen (N) should not exceed: in open hearth steel - 0.005%; in oxygen-converter steel: - without extra-furnace treatment: 0.006% - for thin sheet metal products and strip; 0.008% - for other types of metal products; — with out-of-furnace processing: 0.010% — for thin-sheet metal products and strips; 0.012% - for other types of metal products; in steel smelted in electric furnaces - 0.012%. The mass fraction of nitrogen in steel is not standardized or controlled in the following cases: - if the mass fraction of total aluminum in the steel is at least 0.020% or acid-soluble aluminum - at least 0.015%, or - nitrogen-binding elements (titanium) are introduced, individually or in any combination - no more than 0.040%, vanadium - no more than 0.05%, niobium - no more than 0.05%), while the total mass fraction of aluminum, titanium, vanadium and niobium should be from 0.02% to 0.15%. The mass fraction of the listed elements must be indicated in the quality document.

The mass fraction of residual elements is allowed, no more than: tungsten - 0.20%, molybdenum - 0.11%, vanadium - 0.05% and residual or intentionally introduced titanium (except for steel grades listed in Note 1 of this table) - not more than 0.03%.

According to GOST 4345-2016, the mass fraction of phosphorus, sulfur and residual elements (copper, nickel and chromium) according to the analysis of the ladle sample and in the finished metal products must comply with the requirements of Table 2.

Mechanical properties

SourceDelivery statusSection, mmKPσ0.2 MPaσin MPaδ5, %ψ, %KCU, J/cm2Hardness HB, no more
no less
GOST 4543-71Bar. Hardening at 880 °C in oil; holiday at 540 °C, cool. in water or oil 258301080104549
GOST 8479-70Forging. Hardening + tempering Up to 100490490655164559212-248
100-300490490655134054212-248
Up to 100540540685154559223-262
Up to 100590590735144559235-277
100-300590590735134049235-277
Up to 100640640785134259248-293
Up to 100675675835134259262-311
Bar. Quenching from 860-880 °C in oil; holiday at 200-250 °C, cool. on air 3012701470740HRCе 43-51
Bar. Quenching from 860-880 °C in oil; holiday at 540-560 °C, cool. in water or oil 6069088094559225

Mechanical properties depending on the section

Section, mmσ0.2 MPaσin MPaδ5, %ψ%KCU, J/cm2
308801000125069
60760880125069
80740860145078
120670820145078
160590740146078
200530720144559
240490710144659

Note. Hardening at 880 °C in oil; tempering at 600 °C, cool. in water.

Mechanical properties depending on tempering temperature

tref., °Сσ0.2 MPaσin MPaδ5, %ψ%KCU, J/cm2Hardness HB, no more
20015701700114488487
30015201630115469470
40013201420125649412
50011401220155678362
60094010401962137300

Mechanical properties at elevated temperatures

tsp., °Сσ0.2 MPaσin MPaδ5, %ψ%KCU, J/cm2
Bar. Hardening at 880 °C in oil; tempering at 560 °C
3008209801150127
400780900166998
500640690218478
550490540278464
Sample 5 mm in diameter, 25 mm long, rolled. Deformation speed 2 mm/min; strain rate 0.0013 1/s
7001755951
800856275
900538490
1000377190
1100215990
1200108590

Endurance limit

Strength characteristicsσ-1, MPaτ-1, MPan
σв = 1670 MPa4901666107
σв = 880 MPa372882107
σв = 1080 MPa470106
Hardening from 870 °C; holiday at 200 °C 696
Quenching from 870 °C; tempering at 400 °C 637

Impact strength of KSM

Heat treatmentKCU, J/cm2, at temperature, °C
+20-20-40-60-80
Hardening at 880 °C in oil; tempering at 580-600 °C, σв = 1000 MPa 6955413523

Technological properties

Forging temperature, °C: beginning 1240, end 800. Sections up to 50 mm are cooled in air, sections 51-100 mm are cooled in boxes.

Cutting machinability - Kv tv.spl = 0.75 and Kv b.st = 0.85 in the hot-rolled state at HB 207-217 iov = 710 MPa. Flock sensitivity is sensitive.

Tendency to temper brittleness - prone.

Critical diameter d after quenching in various environments

Amount of martensite, %Critical hardness HRC3d, mm, after hardening
in waterIn oil
5038-4360-9134-60
9043-4840-6818-40

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Mechanical properties

Heat treatment, delivery conditionSection, mms0.2, MPasB, MPad5, %y, %KCU, J/m2HBHRСе
Bar. Quenching 880 °C, oil Tempering 540 °C, water or oil.
258301080104549
Forgings. Hardening. Vacation.
KP 490<100490655164559212-248
KP 490100-300490655134054212-248
KP 540<100540685154559223-262
KP 590<100590735144559235-277
KP 590100-300590735134049235-277
KP 640<100640785134259248-293
KP 675<100675835134259262-311
Quenching 860-880 °C, oil. Vacation 200-250 °C, air.
301270147074043-51
Quenching 860-880 °C, oil. Vacation 540-560 °C, water or oil.
6069088094559225

Steel 30KhGSA. Physical properties

Test temperature, °C20100200300400500600700800900
Modulus of normal elasticity, E, GPa215211203196184173164143125
Density, pn, kg/cm37850
Thermal conductivity coefficient W/(m °C)383837373634333130
Ud. electrical resistance (p, NΩ m) 210
Test temperature, °C20- 0020-2020-30020-40020-50020-60020-70020-80020-90020-1000
Linear expansion coefficient (a, 10-6 1/°С)11.712.312.913.413.714.014.312.9
Specific heat capacity (C, J/(kg °C))496504512533554584622693
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