Steel 20 (20A)

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 20 (20A)

Steel 20 (20A): 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 grade — Steel 20 (20A).

General steel 20 (20A)

Substitute brand

steel 15, 25

Delivery type

Pipe 20, sheet 20, circle 20, channel 20, 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 10234−77. Strip GOST 1577−81, GOST 103−76, GOST 82−70. Wire GOST 5663−79, GOST 17305−71. Forgings and forged billets GOST 8479−70. Pipes GOST 10704−91, GOST 10705−80, GOST 8731−87, GOST 8732−78, GOST 8733−87, GOST 5654−76, GOST 550−75.

Application

After normalization or without heat treatment, crane hooks, couplings, bearing shells and other parts operating at temperatures from -40 to 450 ° C under pressure, after HTT — gears, worms and other parts that require high surface hardness with low core strength …

Chemical composition of steel 20 (20A)

Chemical element	%
Silicon (Si)	0.17−0.37
Manganese (Mn)	0.35−0.65
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)	0.17−0.24
Phosphorus (P), no more	0.035
Chromium (Cr), no more	0.25

Mechanical properties of steel 20 (20A)

Mechanical properties at elevated temperatures

test t, ° C	σ _0.2, MPa	σ _B, MPa	δ ₅ ,%	ψ,%	KCU, J / m ²
20	280	430	34	67	218
200	230	405	28	67	186
300	170	415	29	64	188
400	150	340	39	81	100
500	140	245	40	86	88
700		130	39	94
800		89	51	96
900		75	55	100
1000		47	63	100
1100		thirty	59	100
1200		20	64	100

Mechanical properties of rolled products

Heat treatment, delivery condition	σ _B, MPa	δ ₅ ,%	ψ,%	KCU, J / m ²
Calibrated hot-rolled steel, forged and silver grade 2 after normalization	410	25	55
Calibrated steel grade 5 after work-hardening	490	7	40
Calibrated steel grade 5 after annealing or high tempering	390	21	50
Calibrated and calibrated steel with special finishing after tempering or annealing	390−490		50	163
Calibrated and calibrated steel with special finishing after spheroidizing annealing	340−440		50	163
Steel calibrated and calibrated with a special finish, work-hardened without heat treatment	490	7	40	207
Normalized or hot rolled strips	410	25	55
Heat-treated sheet of the 1st-2nd category	340−490	28		127

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	<100	175	350	28	55	64	101−143
KP 175	100−300	175	350	24	50	59	101−143
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	195	390	26	55	59	111−156
KP 195	100−300	195	390	23	50	54	111−156
KP 215	<100	215	430	24	53	54	123−167
KP 215	100−300	215	430	20	48	49	123−167
Hardening. Vacation.
KP 245	100−300	245	470	19	42	39	143−179

Mechanical properties of steel after HTT

Section, mm

σ _0.2, MPa

σ _B, MPa

δ ₅ ,%

ψ,%

KCU, J / m ²

HRC _e

Cementation 920−950 ° С, air. Hardening 800−820 ° C, water. Vacation 180−200 ° C, air.

290−340

490−590

eighteen

156

55−63

Technological properties of steel 20 (20A)

Forging temperature

Beginning 1280, end 750. Air cooling.

Weldability

It can be welded without restrictions, except for parts after chemical heat treatment. Methods of welding RDS, ADS submerged arc and gas shielded, KTS.

Machinability by cutting

In the hot-rolled state at HB 126−131 and σ _B = 450−490 MPa, K _{υ tv.spl.} = 1.7 and K _{υ b.st.} = 1.6.

Tendency to release ability

Not inclined.

Flock sensitivity

Not sensitive.

Temperature of critical points of steel 20 (20A)

Critical point	° C
Ac1	735
Ac3	850
Ar3	835
Ar1	680

Impact strength of steel 20 (20A)

Impact strength, KCU, J / cm ²

Delivery status, heat treatment	+20	-20	-40	-60
Annealing	110	68	47	ten
Nominalization	157	109	86	15−38

Endurance limit of steel 20 (20A)

σ _-1, MPa	τ _-1, MPa	n	σ _B, MPa	σ _0.2, MPa	Heat treatment, steel condition
206		1E + 7	500	320
245			520	310
225			490	280
205	127				Normalization 910 C, tempering 620 C.
193			420	280
255	451				Cementation 930 C, hardening 810 C, tempering 190 C.

Physical properties of steel 20 (20A)

Test temperature, ° С	20	100	200	300	400	500	600	700	800	900
Normal elastic modulus, E, GPa	212	208	203	197	189	177	163	140
Torsional shear elastic modulus G, GPa	78	77	76	73	69	66	59
Density of steel, pn, kg / m ³	7859	7834	7803	7770	7736	7699	7659	7917	7624	7600
Thermal conductivity coefficient W / (m ° С)		51	49	44	43	39	36	32	26	26
Ud. electrical resistance (p, Nom. m)		219	292	381	487	601	758	925	1094	1135
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)	12.3	13.1	13.8	14.3	14.8	15.1	15.2
Specific heat (C, J / (kg ° C))	486	498	514	533	555	584	636	703	703	695

Steel 20 (20A)

Description

Steel 20 (20A)

General steel 20 (20A)

Chemical composition of steel 20 (20A)

Mechanical properties of steel 20 (20A)

Mechanical properties at elevated temperatures

Mechanical properties of rolled products

Mechanical properties of forgings

Mechanical properties of steel after HTT

Technological properties of steel 20 (20A)

Temperature of critical points of steel 20 (20A)

Impact strength of steel 20 (20A)

Endurance limit of steel 20 (20A)

Physical properties of steel 20 (20A)

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Steel 20 (20A)

Description

Steel 20 (20A)

General steel 20 (20A)

Chemical composition of steel 20 (20A)

Mechanical properties of steel 20 (20A)

Mechanical properties at elevated temperatures

Mechanical properties of rolled products

Mechanical properties of forgings

Mechanical properties of steel after HTT

Technological properties of steel 20 (20A)

Temperature of critical points of steel 20 (20A)

Impact strength of steel 20 (20A)

Endurance limit of steel 20 (20A)

Physical properties of steel 20 (20A)

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