Steel 38ХН3МА

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 38ХН3МА

Steel 38ХН3МА: brand of steels and alloys. Below is the systematized information on the purpose, chemical composition, types of supplies, substitutes, temperature of critical points, physical, mechanical, technological and casting properties for the brand — Steel 38ХН3МА.

General information about steel 38ХН3МА

Substitute brand

steel 38ХН3ВА.

Delivery type

Long products, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated bar GOST 4543−71, GOST 7417−75, GOST 8559−75, GOST 8560−78. Polished bar and silver bar GOST 4543−71, GOST 14955−77. Strip GOST 103−76. Forgings and forged billets GOST 4543−71, GOST 1133−71, GOST 8479−70.

Application

Shafts, axles, gears and other large critical parts.

Chemical composition of 38ХН3МА steel

Chemical element	%
Silicon (Si)	0.17−0.37
Manganese (Mn)	0.25−0.50
Copper (Cu), no more	0.30
Molybdenum (Mo)	0.20−0.30
Nickel (Ni)	2.75−3.25
Sulfur (S), no more	0.025
Carbon (C)	0.33−0.40
Phosphorus (P), no more	0.025
Chromium (Cr)	0.80−1.20

Mechanical properties of steel 38ХН3МА

Mechanical properties

Heat treatment, delivery condition	Section, mm	σ _0.2, MPa	σ _B, MPa	δ ₅ ,%	ψ,%	KCU, J / m ²	HB
Bar. Hardening 850 ° С, oil. Vacation 590 ° C, air.
	25	980	1080	12	50	78
Forgings. Hardening. Vacation.
KP 640	300−500	640	785	eleven	33	44	248−293
KP 640	500−800	640	785	ten	thirty	39	248−293
Normalization
KP 685	100−300	685	835	12	38	49	262−311
KP 685	300−500	685	835	eleven	33	39	262−311
Hardening. Vacation
KP 685	500−800	685	835	ten	thirty	39	262−311
Normalization
KP 735	100−300	735	880	12	35	49	277−321
Hardening. Vacation.
KP 735	300−500	735	880	eleven	thirty	39	277−321
KP 735	300−500	785	930	ten	thirty	39	293−331

Mechanical properties depending on the tempering temperature

vacation t, ° С	σ _0.2, MPa	σ _B, MPa	δ ₅ ,%	ψ,%	KCU, J / m ²	HB
Hardening 840 ° С, oil.
200	1520	1710	ten	48	78	475
300	1400	1570	ten	49	39	440
400	1250	1370	ten	50	49	400
500	1080	1220	12	54	78	350
600	900	1030	17	60	118	300

Mechanical properties depending on the section

Section, mm	σ _0.2, MPa	σ _B, MPa	δ ₅ ,%	ψ,%	KCU, J / m ²
Bar. Hardening 850 ° С, oil. Vacation 580−600 ° С, air.
thirty	940	1060	12	50	98
50	900	1040	12	50	98
80	880	1020	12	50	98
120	860	1020	12	50	78
160	840	1000	ten	45	59
200	800	980	ten	45	59
240	780	980	ten	45	59

Technological properties of steel 38ХН3МА

Forging temperature

The beginning is 1200, the end is 850.

Weldability

not applicable for welded structures.

Tendency to release ability

not inclined

Flock sensitivity

hypersensitive

Temperature of critical points of steel 38ХН3МА

Critical point	° C
Ac1	730
Ac3	770
Ar3	315
Ar1	300

Impact strength of steel 38ХН3МА

Impact strength, KCU, J / cm ²

Delivery status, heat treatment	+20	-40	-60	-80
Bars with a section of 10 mm. Hardening 850 С, oil. Vacation 550 С, water.	100	97	95	95
Bars with a section of 10 mm. Hardening 850 С, oil. Vacation 650 С, water.	135	137	138	133

Endurance limit of steel 38ХН3МА

σ _-1, MPa	τ _-1, MPa	n	σ _0.2, MPa	Heat treatment, steel condition
549		1E + 5	920	Hardening. High vacation.
461		1E + 6	920	Hardening. High vacation.
431	294	5E + 6	920	Hardening. High vacation.

Short-term thermal strength of steel 38ХН3МА

Test temperature, ° С	s _0.2, MPa	σ _B, MPa	d ₅ ,%	y,%
200	940	1080	thirteen	49
300	860	1030	thirteen	60
400	800	930	12	70
500	710	760	fourteen	78
600	440	490	26	84

Physical properties of steel 38ХН3МА

Test temperature, ° С	20	100	200	300	400	500	600	700	800	900
Normal elastic modulus, E, GPa	207	203	196	192	182	173	167	147	135
Torsional shear elastic modulus G, GPa	82	80	77	76	72	69	66	57	53
Thermal conductivity coefficient W / (m ° С)	36	36	36	35	34	33	31	thirty	29
Ud. electrical resistance (p, Nom. m)	292	317	358	425	506	602	742	890	1100
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)	11.8	12.3	12.7	13.1	13.4	13.7	13.9	10.8
Specific heat (C, J / (kg ° C))	496	508	525	538	567	601	672	697

Steel 38ХН3МА

Description