Steel 40ХН2МА

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 40ХН2МА

Steel 40ХН2МА: 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 brand — Steel 40XH2MA.

General information about steel 40ХН2МА

Substitute brand

steel: 40HGT, 40HGR, 30H3MF, 45HN2MFA.

Delivery type

Circle 40xn2ma, pipe 40xn2ma, long products, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69, GOST 10702−78. Calibrated bar GOST 7417−75, GOST 8559−75, GOST 8560−78, GOST 1051−73, GOST 10702−78. Polished bar and silver bar GOST 14955−77. Strip GOST 103−76. Forgings and forged billets GOST 1133−71, GOST 8479−70. Rolls OST 24.013.04.-83, OST 24.013.20−85.

Application

Crank shafts, valves, connecting rods, connecting rod caps, critical bolts, gears, cam clutches, discs and other heavily loaded parts. Rolls for cold rolling of metals.

Chemical composition of steel 40ХН2МА

Chemical element	%
Silicon (Si)	0.17−0.37
Manganese (Mn)	0.50−0.80
Copper (Cu), no more	0.30
Molybdenum (Mo)	0.15−0.25
Nickel (Ni)	1.25−1.65
Sulfur (S), no more	0.025
Carbon (C)	0.37−0.44
Phosphorus (P), no more	0.025
Chromium (Cr)	0.60−0.90

Mechanical properties of steel 40ХН2МА

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 620 ° С, water.
	25	930	1080	12	50	78
Bar. Hardening 850 ° С, oil. Vacation 620 ° С, oil
	25	835	980	12	55	98
Forgings. Hardening. Vacation.
KP 440	500−800	440	635	eleven	thirty	39	197−235
KP 490	300−500	490	655	12	35	49	212−248
KP 490	500−800	490	655	eleven	thirty	39	212−248
KP 540	100−300	540	685	thirteen	40	49	223−262
KP 540	300−500	540	685	12	35	44	223−262
KP 590	100−300	590	735	thirteen	40	49	235−277
KP 590	300−500	590	735	12	35	44	235−277
KP 590	500−800	590	735	ten	thirty	39	235−277
KP 640	100−300	640	785	thirteen	38	49	248−293
KP 640	300−500	640	785	eleven	33	44	248−293
KP 685	100−300	685	835	12	338	49	262−311
KP 735	<100	735	880	thirteen	40	59	277−321
KP 735	100−300	735	880	12	35	49	277−321
KP 785	<100	785	785	12	40	59	293−331
KP 785	100−300	785	785	eleven	35	49	293−331

Mechanical properties at elevated temperatures

test t, ° C	σ _0.2, MPa	σ _B, MPa	δ ₅ ,%	ψ,%	KCU, J / m ²
Hardening 850 ° С, oil. Vacation 580 ° С
20	950	1070	sixteen	58	78
250	830	1010	thirteen	47	109
400	770	950	17	63	84
500	680	700	eighteen	80	54
Sample 5 mm in diameter, 25 mm long, rolled. Deformation rate 2 mm / min. Strain rate 0.001 1 / s.
700		185	17	32
800		89	66	90
900		50	69	90
1000		35	75	90
1100		24	72	90
1200		fourteen	62	90

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 850 ° С, oil.
200	1600	1750	ten	50	59	525
300	1470	1600	ten	50	49	475
400	1240	1370	12	52	59	420
500	1080	1180	fifteen	59	88	350
600	860	960	20	62	147	275

Mechanical properties depending on the section

Heat treatment, delivery condition	Section, mm	σ _0.2, MPa	σ _B, MPa	δ ₅ ,%	ψ,%	KCU, J / m ²	HRC _e
Bar. Hardening 850 ° С, oil. Vacation 620 ° С
Sample cutting location — center	40	880	1030	fourteen	57	118	33
Sample cutting location — center	60	830	980	sixteen	60	127	32
Sample cutting place — 1 / 2R	80	730	880	17	61	127	29
Sample cutting place — 1 / 2R	100	670	850	19	61	127	26
Sample cutting location — 1 / 3R	120	630	830	20	62	127	25
Hardening 850 ° С, oil. Vacation 540−660 ° С
Sample cutting location — center	<16	1000	1200−1400	nine		90
Sample cutting location — center	16−40	900	1100−1300	ten		50
Sample cutting location — center	40−100	800	1000−1200	eleven		60
Sample cutting location — center	100−160	700	900−1100	12		60
Sample cutting location — center	160−250	650	850−1000	12		60

Technological properties of steel 40ХН2МА

Forging temperature

Beginning 1220, end 800. Sections up to 80 mm — annealing with recrystallization, two supercooling, tempering.

Weldability

difficult to weld. Welding method: RDS. Heating and subsequent heat treatment is required.

Machinability by cutting

In the hot-rolled state at HB 228−235 σ _B = 560 MPa K _{υ tv.spl.} = 0.7, K _{υ b.st.} = 0.4.

Tendency to release ability

not inclined

Flock sensitivity

sensitive

Temperature of critical points of steel 40ХН2МА

Critical point	° C
Ac1	730
Ac3	820
Ar3	550
Ar1	380
Mn	320

Impact strength of steel 40ХН2МА

Impact strength, KCU, J / cm ²

Delivery status, heat treatment	+20	-40	-60
Guenching 860 C, oil. Vacation 580 C.	103	93	59

Endurance limit of steel 40ХН2МА

σ _-1, MPa	τ _-1, MPa	n	σ _B, MPa	σ _0.2, MPa	Heat treatment, steel condition
447	274		880		Section 100 m. Quenching 850 C, oil. Vacation 580 C.
392	235		790		Section 400 m. Quenching 850 C, oil. Vacation 610 С.
519		1E + 6	1080	880

Hardenability of steel 40ХН2МА

Tempering 840 C.

Distance from the end, mm / HRC _e
1.5	3	6	nine	12	fifteen	21	27	33	42
49−59.5	40.5−60	50−60	50−59.5	49−59	48−58	45−56	41.5−53	41−50.5	36.5−48.5

Amount of martensite,%	Crit. Diam. in water, mm	Crit. Diam. in oil, mm	Crete. hardness, HRCэ
50	153	114	44−47
90	137−150	100−114	49−53

Corrosion properties of steel 40ХН2МА

Wednesday	Test temperature, ° С	Depth, mm / year
Water	300	0.05−0.1

Physical properties of steel 40ХН2МА

Test temperature, ° С	20	100	200	300	400	500	600	700	800	900
Normal elastic modulus, E, GPa	215	211	201	190	177	173
Torsional shear elastic modulus G, GPa	84	81	77	73	68	66
Thermal conductivity coefficient W / (m ° С)	39	38	37	37	35	33	31	29	27
Ud. electrical resistance (p, Nom. m)	331
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)	11.6	12.1	12.7	13.2	13.6	13.9
Specific heat (C, J / (kg ° C))	490	506	522	536	565

Steel 40ХН2МА

Description