Steel 30

VSt6ps VSt5sp VSt3kp VSt4kp VSt6sp VSt2kp Vst4ps St0 VSt2ps VSt3ps VSt5ps VSt2sp VSt3sp 18К 08ps 10ps 15К 18kp 20ps 35 55 05kp 08Ю 15kp 20 (20А) 22К 40 58 (55ПП) 08 10 (Art. 10) 12К 15pc 20К 25 45 60 08kp 10kp 15 16К 20kp 30 50 0cB 60С2 60C2XA 50XFA 60C2A 60C2CHFA 65C2VA 85 55XGR 65 70C3A 55С2 60Г 60C2H2A 65Г 70 75 SHKH15 SHKH15SG SH4 А12 А20 A40G А30 10XNDP 14G2AF 15G2AFDps 17GS 18G2AFps 09Г2 10G2BD 10ХСНД 12GS 15G2SFD 16GS 35GS 14CGS 15ХСНД 20ХГ2Ц 09G2S 10G2S1 14Г2 16G2AF 17G1S 25G2S 10Г2 14X2GMR 15KHF 18CR2N4MA 20Г 20X2H4A 20XGR 20KHN2M (20KHNM) 30Г 30CGS 30CRNI2MA 34CRNI3M 35Х 38CR2N3M 38XA 38CMA 3CR3M3F 40Х 40XFA 45CRN 50Г2 12XH2 15Х 20KHGSA 20XHN3A 25CGSA 30KHGSA 30CRNI2MOVA 33HS 35KHN1M2FA 38CR2NM 40Г 40CR2H2MA 40CRN 45Г 45CRNI2MOVA 50Х 12XH2A 18CGT 20CRNR 20CRNI4FA 25CGT 30Х 30CGSN2A 30KHN3A 34CRNI1M 35Г 36CR2NI2MOVA 38KH2NMF 38CRN 38CRNI3MA 40Г2 40CRNI2MA 45Г2 47GT 50XH 12CR2N4A 12XHN3A 15Г 18CR2N4VA 20Х 20XH 20XNR 30CGT 30ХН3М2ФА 35Г2 35CGSA 38CR2H2MA 38CRNI3MOVA 40HS 45Х 50Г

Description

Steel 30

Steel 30: brand of steels and alloys. Below is a systematized information on the purpose, chemical composition, types of supplies, substitutes, temperature of critical points, physical, mechanical, technological and casting properties for the Steel 30 grade.

General steel 30

Substitute brand

steel: 25, steel 35

Delivery type

Long products, including shaped: GOST 1050−74, GOST 2590−71, GOST 2591−71, GOST 2879−69, GOST 8509−86, GOST 8510−86, GOST 8240−72, GOST 8239−72. Calibrated bar GOST 7417−75, GOST 8559−75, GOST 8560−78, GOST 10702−78. Polished bar and silver bar GOST 14955−77, GOST 10702−78. Thick sheet GOST 1577−81, GOST 19903−74. Thin sheet GOST 16523−70. Tape GOST 6009−74, GOST 2284−79, GOST 10234−77. Strip GOST 103−76, GOST 82−70, GOST 1577−81. Wire GOST 5663−79, GOST 17305−71. Forgings and forged billets GOST 1133−71, GOST 8479−70.

Application

Rods, shackles, traverses, levers, shafts, sprockets, spindles, press cylinders, couplings and other parts of low strength.

Chemical composition of steel 30

Chemical element	%
Silicon (Si)	0.17−0.37
Manganese (Mn)	0.50−0.80
Copper (Cu), no more	0.25
Arsenic (As), no more	0.08
Nickel (Ni), no more	0.25
Sulfur (S), no more	0.04
Carbon (C)	0.27−0.35
Phosphorus (P), no more	0.035
Chromium (Cr), no more	0.25

Mechanical properties of steel 30

Mechanical properties at elevated temperatures

test t, ° C	σ _0.2, MPa	σ _B, MPa	δ ₅ ,%	ψ,%	KCU, J / m ²
Delivery status
20	320	530	25	52	62
300	205	580	21	51	70
500	145	350	24	70	43
600	78	195	35	83	74
Sample with a diameter of 5 mm, a length of 25 mm, deformed. Deformation rate 10 mm / min. Strain rate 0.007 1 / s.
800		98	49	98
900		77	53	100
1000		48	56	100
1100		thirty	58	100
1200		21	64	100

Mechanical properties of rolled products

Heat treatment, delivery condition	Section, mm	σ _0.2, MPa	σ _B, MPa	δ ₅ ,%	δ ₄ ,%	ψ,%	HB
Hot rolled steel, forged, calibrated and silver grade 2 after normalization	25	290	490	21		50
Calibrated steel grade 5 after work-hardening			560	7		35
Calibrated steel grade 5 after annealing or high tempering			440	17		45
Calibrated and calibrated steel with special finishing: after annealing or tempering			<570			45	179
Steel calibrated and calibrated with special finishing: after spheroidizing annealing			<520			45	179
Calibrated and calibrated steel with special finishing: work-hardened without heat treatment			560	7		40	229
Annealed or highly tempered sheets	80		430	24
Normalized or hot rolled strips	6−25	295	490	21		50
Hot rolled sheet	<2		440−590		19
Hot rolled sheet	2−3.9		440−590		20
Cold rolled sheet	<2		440−590		20
Cold rolled sheet	2−3.9		440−590		21
Heat-treated sheet of the 1st-2nd category	4−14		430−590	24			149
Cold rolled annealed strip	0.1−4		400−650		sixteen
Cold-rolled cold-worked strip, strength class H1	0.1−4		650−850
Annealed crimped tape	0.1−4		<600	fifteen

Mechanical properties of forgings

Heat treatment, delivery condition	Section, mm	σ _0.2, MPa	σ _B, MPa	δ ₅ ,%	ψ,%	KCU, J / m ²	HB
Normalization
KP 175	300−500	175	350	22	45	54	101−143
KP 175	500−800	175	350	20	40	49	101−143
KP 195	100−300	195	390	23	50	54	111−156
KP 195	300−500	195	390	20	45	49	111−156
KP 195	500−800	195	390	eighteen	38	44	111−156
KP 215	100−300	215	430	20	48	49	123−167
KP 215	300−500	215	430	eighteen	40	44	123−167
KP 215	500−800	215	430	sixteen	35	39	123−167
KP 245	<100	245	470	22	48	49	143−179
KP 245	100−300	245	470	19	42	39	143−179
KP 245	300−500	245	470	17	35	34	143−179

Mechanical properties depending on the tempering temperature

vacation t, ° С

σ _0.2, MPa

σ _B, MPa

δ ₅ ,%

ψ,%

KCU, J / m ²

Hire. Hardening 860 ° C, water. Samples with a diameter of 60 mm.

400

420−490

560−680

16−24

53−64

90−190

153−189

500

390−440

540−630

18−27

61−68

120−210

150−175

600

350−390

490−570

21−28

66−72

150−230

138−158

Technological properties of steel 30

Forging temperature

Beginning 1280, end 750. Billets with a cross section up to 800 mm are cooled in air.

Weldability

Limited weldability. Methods of welding RDS, ADS submerged arc and gas shielded, EShS. Heating and subsequent heat treatment is recommended. KTS without restrictions.

Machinability by cutting

In the hot-rolled state at HB 143 and σ _B = 460 MPa, K _{υ tv.spl.} = 1.7.

Tendency to release ability

Not inclined.

Flock sensitivity

Not sensitive.

Temperature of critical points of steel 30

Critical point	° C
Ac1	730
Ac3	820
Ar3	796
Ar1	680
Mn	380

Impact strength of steel 30

Impact strength, KCU, J / cm ²

Delivery status, heat treatment	+20	-40	-60
Billets with a diameter of 60 mm. Quenching 860 C in water. Vacation 400 S.	72	45	42

Endurance limit steel 30

σ _-1, MPa	σ _B, MPa	Heat treatment, steel condition
255	530	Quenching 830 C in oil. Vacation 640 S.
206	495	Normalization 875 C, air.

Hardenability of steel 30

Hardening 900 C. Hardness for strips of hardenability HRCe.

Distance from the end, mm / HRC _e
1.5	3	4.5	6	7.5
45.5	42.5	35	24	20.5

Heat treatment	Amount of martensite,%	Crit. Diam. in water, mm	Crit. Diam. in oil, mm
Hardening	50	eighteen	nine

Physical properties of steel 30

Test temperature, ° С	20	100	200	300	400	500	600	700	800	900
Normal elastic modulus, E, GPa	200	196	191	185			164
Torsional shear elastic modulus G, GPa	78	77	76	73	69	66	59
Density of steel, pn, kg / m ³	7850
Thermal conductivity coefficient W / (m ° С)	52	51	49	46	43	39	36	32
Test temperature, ° С	20−100	20−200	20−300	20−400	20−500	20−600	20−700	20−800	20−900	20−1000
Linear expansion coefficient (a, 10−6 1 / ° С)	12.1	12.9	13.6	14.2	14.7	15.0	15.2
Specific heat (C, J / (kg ° C))	470	483	546	563	764

Steel 30

Description

Steel 30

General steel 30

Chemical composition of steel 30

Mechanical properties of steel 30

Mechanical properties at elevated temperatures

Mechanical properties of rolled products

Mechanical properties of forgings

Mechanical properties depending on the tempering temperature

Technological properties of steel 30

Temperature of critical points of steel 30

Impact strength of steel 30

Endurance limit steel 30

Hardenability of steel 30

Physical properties of steel 30

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Steel 30

Description

Steel 30

General steel 30

Chemical composition of steel 30

Mechanical properties of steel 30

Mechanical properties at elevated temperatures

Mechanical properties of rolled products

Mechanical properties of forgings

Mechanical properties depending on the tempering temperature

Technological properties of steel 30

Temperature of critical points of steel 30

Impact strength of steel 30

Endurance limit steel 30

Hardenability of steel 30

Physical properties of steel 30

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