Steel 40KHN2MA (40HNMA)

Designation

Name	The value
Designation GOST Cyrillic	40ХН2МА
Designation GOST Latin	40XH2MA
Transliteration	40HN2MA
By chemical elements	40CrН2Mo

Name	The value
Designation GOST Cyrillic	40ХНМА
Designation GOST Latin	40XHMA
Transliteration	40HNMA
By chemical elements	40CrНMo

Description

40KHN2MA steel is used: for the manufacture of forged rings, crankshafts, valves, connecting rods, connecting rod bearing caps, responsible, bolts, and other fasteners, special fasteners, gears, dog clutch, wheels and other heavily loaded parts; for the production of rolls for cold rolling of metals; for the manufacture of parts of pipeline fittings; parts of aircraft (rotor shafts, crank shafts, shafts gear, connecting rods, air-cooled engine, responsible of bolts, pins, parts, screw, massive and power details RD), operating at temperatures up to +500°.

Note

Structural steel high-quality romancelatina.
The 40HNMA steel compared to the steel alloyed with 18ХНВА less, but contains more carbon and is insensitive to temper embrittlement.

Standards

Name	Code	Standards
Sheets and strips	В23	GOST 103-2006
Bars and shapes	В32	GOST 1051-73, GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 10702-78, GOST 14955-77, OST 1 90225-76, TU 3-309-85, TU 14-1-1610-76, TU 14-1-1684-86, TU 14-1-1885-85, TU 14-1-2118-77, TU 14-1-2598-79, TU 14-1-2765-79, TU 14-1-2995-80, TU 14-1-658-73, TU 14-1-950-74, TU 14-11-245-88, TU 14-1-3011-80, TU 14-1-1271-75, TU 14-136-367-2008
Bars and shapes	В22	GOST 1133-71, GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Processing of metals by pressure. Forgings	В03	GOST 8479-70, OST 5Р.9125-84, ST ЦКБА 010-2004
Classification, nomenclature and General rules	В20	OST 1 90005-91
Blanks. Of the workpiece. Slabs	В21	OST 14-13-75
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, TU 14-1-1937-77, TU 14-1-4944-90, TU 14-1-5.17-74, TU 14-1-5.17-73, TU 1-92-156-90
Thermal and thermochemical treatment of metals	В04	ST ЦКБА 026-2005
Steel pipes and fittings to them	В62	TU 14-3-1550-88, TU 14-3-249-74, TU 14-3-389-75, TU 14-3-572-77, TU 14-3-588-76
Tape	В34	TU 14-4-95-72

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo	W
TU 14-1-1885-85	0.37-0.44	≤0.015	≤0.025	0.5-0.8	0.6-0.9	0.17-0.37	1.25-1.65	Rest	≤0.25	-	-	0.15-0.25	-
TU 14-1-2765-79	0.37-0.44	≤0.012	≤0.016	0.5-0.8	0.6-0.9	0.17-0.37	1.25-1.65	Rest	≤0.25	≤0.05	≤0.03	0.15-0.25	≤0.2
TU 14-1-950-74	0.37-0.44	≤0.025	≤0.025	0.5-0.8	0.6-0.9	0.17-0.37	1.25-1.65	Rest	≤0.25	≤0.05	≤0.03	0.15-0.25	≤0.2
TU 14-4-95-72	0.37-0.44	≤0.04	≤0.04	0.5-0.8	0.6-0.9	0.15-0.4	1.6-1.9	Rest	-	-	-	0.2-0.35	-
OST 1 90225-76	0.37-0.44	≤0.025	≤0.025	0.5-0.8	0.6-0.9	0.17-0.37	1.25-1.65	Rest	≤0.3	≤0.05	≤0.03	0.15-0.25	≤0.2

Fe is the basis.
GOST 4543-71 regulates the content of high-quality steel: P≤0,025%; S≤0.015%; Сu≤0.25%.
According to TU 14-1-2765-79 the chemical composition is given for steel grade 40ХН2МА-Ш.
According to TU 14-1-950-86 the chemical composition is given for steel grade 40HN2MA.
TU 14-4-95-72 the chemical composition is given for steel grade 40ХНМ.
According to TU 14-1-1885-85 the chemical composition is given for steel grade 40ХН2МА-ВД. To ensure the required grain size, it is allowed to introduce vanadium in the steel smelting at the rate of its content in steel no more than 0.10%, the content of which in steel is not determined. The presence of tungsten to 0.20%, titanium to 0.030% is not a rejection sign. In the steel, partial replacement of molybdenum with tungsten is allowed. The total content of molybdenum and tungsten converted to molybdenum from the calculation: three parts by weight of tungsten replace one part by weight of molybdenum, should correspond to the content of molybdenum indicated in the table. In this case, the content of tungsten in steel should not exceed 0.30%. The allowable variation in manganese content in steel is + 0.010 / -0.020%.

Mechanical properties

Section, mm	t отпуска, °C	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa	HRC
Forgings. Hardening + Vacation
500-800	-	≥440	≥635	≥11	≥30	≥390	197-235	-
300-500	-	≥490	≥655	≥12	≥35	≥490	212-248	-
500-800	-	≥490	≥655	≥11	≥30	≥390	212-248	-
100-300	-	≥540	≥685	≥13	≥40	≥490	223-262	-
300-500	-	≥540	≥685	≥12	≥35	≥440	223-262	-
100-300	-	≥590	≥735	≥13	≥40	≥490	235-277	-
300-500	-	≥590	≥735	≥12	≥35	≥440	235-277	-
500-800	-	≥590	≥735	≥10	≥30	≥390	235-277	-
100-300	-	≥640	≥785	≥13	≥38	≥490	248-293	-
300-500	-	≥640	≥785	≥11	≥33	≥440	248-293	-
100-300	-	≥685	≥835	≥12	≥33	≥490	262-311	-
≤100	-	≥735	≥880	≥13	≥40	≥590	277-321	-
100-300	-	≥735	≥880	≥12	≥35	≥490	277-321	-
≤100	-	≥785	≥885	≥12	≥40	≥590	293-331	-
100-300	-	≥785	≥885	≥11	≥35	≥490	293-331	-
Rolled steel. Quenching in oil from 850 °C + Vacation at 540-660 °C (named place of clippings sample)
100-160	-	≥700	900-1100	≥12	-	-	-	-
Hot-rolled steel and hot rolled with special surface finish. Heat-treated (annealing)
	-	-	-	-	-	-	≤269	-
Rolled steel. Quenching in oil from 850 °C + Vacation
-	200	≥1600	≥1750	≥10	≥50	≥590	≥525	-
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	-	980-1130	-	-	-	285-331	30-36
The sample is diameter 5 mm, length 25 mm, laminated. The rate of deformation of 2 mm/min strain Rate of 0.001 1/s
-	-	-	≥185	≥17	≥32	-	-	-
Rolled steel. Quenching in oil from 850 °C + Vacation at 540-660 °C (named place of clippings sample)
16-40	-	≥900	1100-1300	≥10	-	-	-	-
Steel calibrated and calibrated with special surface finish. After spheroidizing annealing
	-	-	≤640	-	≥50	-	≤269	-
Rolled steel. Quenching in oil from 850 °C + Vacation
-	300	≥1470	≥1600	≥10	≥50	≥490	≥475	-
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	-	1080-1270	-	-	-	311-363	34-39
The sample is diameter 5 mm, length 25 mm, laminated. The rate of deformation of 2 mm/min strain Rate of 0.001 1/s
-	-	-	≥89	≥66	≥90	-	-	-
Rolled steel. Quenching in oil from 850 °C + Vacation at 540-660 °C (named place of clippings sample)
160-250	-	≥650	850-1000	≥12	-	-	-	-
Rolled steel. Quenching in oil from 850 °C + Vacation
-	400	≥1240	≥1370	≥12	≥52	≥590	≥420	-
The sample is diameter 5 mm, length 25 mm, laminated. The rate of deformation of 2 mm/min strain Rate of 0.001 1/s
-	-	-	≥50	≥69	≥90	-	-	-
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	-	-	-	-	-	285-341	27-37
Blank pieces of pipe fittings. Quenching in oil from 840-860 °C (exposure for 2.5-4.5 hours depending on the thickness and weight of the workpiece) + Holiday cooling in water or oil
≤100	550-620	735-835	≥880	≥13	≥40	≥600	277-321	-
Rolled steel. Quenching in oil from 850 °C + Vacation at 540-660 °C (named place of clippings sample)
40-100	-	≥800	1000-1200	≥11	-	-	-	-
Rolled steel. Quenching in oil from 850 °C + Vacation
-	500	≥1080	≥1180	≥15	≥59	≥880	≥350	-
The sample is diameter 5 mm, length 25 mm, laminated. The rate of deformation of 2 mm/min strain Rate of 0.001 1/s
-	-	-	≥35	≥75	≥90	-	-	-
Blank pieces of pipe fittings. Quenching in oil from 840-860 °C (exposure for 2.5-4.5 hours depending on the thickness and weight of the workpiece) + Holiday cooling in water or oil
≤80	550-560	785-930	≥930	≥12	≥40	≥600	293-331	-
Rolled steel. Quenching in oil from 850 °C + Vacation at 540-660 °C (named place of clippings sample)
16	-	≥1000	1200-1400	≥9	-	-	-	-
Rolled steel. Quenching in oil from 850 °C + Vacation
-	600	≥860	≥960	≥20	≥62	≥1450	≥275	-
The sample is diameter 5 mm, length 25 mm, laminated. The rate of deformation of 2 mm/min strain Rate of 0.001 1/s
-	-	-	≥24	≥72	≥90	-	-	-
Blank pieces of pipe fittings. Quenching in oil from 840-860 °C (exposure for 2.5-4.5 hours depending on the thickness and weight of the workpiece) + Vacation, cooling in oil or air
≤20	200-250	≥1470	≥1617	≥9	≥45	≥490	-	49.3-54.2
Rolled steel. Quenching in oil from 850 °C + Vacation at 620 °C (named place of clippings sample)
60-80	-	≥730	≥880	≥17	≥61	-	-	≥29
The sample is diameter 5 mm, length 25 mm, laminated. The rate of deformation of 2 mm/min strain Rate of 0.001 1/s
-	-	-	≥14	≥62	≥90	-	-	-
Blank pieces of pipe fittings. Quenching in oil from 840-860 °C (exposure for 2.5-4.5 hours depending on the thickness and weight of the workpiece) + Vacation, cooling in oil or air
≤240	570-600	≥590	≥735	≥13	≥40	≥490	235-277	-
Rolled steel. Quenching in oil from 850 °C + Vacation at 620 °C (named place of clippings sample)
80-100	-	≥670	≥850	≥19	≥61	-	-	≥26
Rolled steel. Quenching in oil from 850 °C + Vacation at 580 °C
-	-	≥950	≥1070	≥16	≥58	-	-	-
Blank pieces of pipe fittings. Quenching in oil from 840-860 °C (exposure for 2.5-4.5 hours depending on the thickness and weight of the workpiece) + Vacation, cooling in oil or air
≤500	580-620	≥490	≥655	≥12	≥35	≥490	212-248	-
Rolled steel. Quenching in oil from 850 °C + Vacation at 620 °C (named place of clippings sample)
100-120	-	≥630	≥830	≥20	≥62	-	-	≥25
Rolled steel. Quenching in oil from 850 °C + Vacation at 580 °C
-	-	≥830	≥1010	≥13	≥47	-	-	-
Ring clinocerinae for OST 1 90225-76. Quenching in oil with 835-865 °C + Vacation at 570-670 °C, cooling in oil or water
	-	≥833	≥980	≥12	≥44	≥735	-	-
Rolled steel. Quenching in oil from 850 °C + Vacation at 620 °C (named place of clippings sample)
25-40	-	≥880	≥1030	≥14	≥57	-	-	≥33
Rolled steel. Quenching in oil from 850 °C + Vacation at 580 °C
-	-	≥770	≥950	≥17	≥63	-	-	-
Ring clinocerinae for OST 1 90225-76. Quenching in oil with 835-865 °C + Vacation at 570-670 °C, cooling in oil or water
	-	≥833	≥980	≥12	≥55	≥980	-	-
Rolled steel. Quenching in oil from 850 °C + Vacation at 620 °C (named place of clippings sample)
40-60	-	≥830	≥980	≥16	≥60	-	-	≥32
Rolled steel. Quenching in oil from 850 °C + Vacation at 580 °C
-	-	≥680	≥700	≥18	≥80	-	-	-
Bars and strip hot rolled and forged. Quenching in oil with 835-865 °C + vacation at 570-670 °C, cooling in water or oil
	-	≥835	≥980	≥12	≥55	≥980	294-341	-
Bars and strip hot rolled and forged. Quenching in oil with 835-865 °C + Vacation at 570-670 °C, cooling in oil
25	-	≥932	≥1080	≥12	≥50	≥785	321-376	-
Bars of steel grade 40KHN2MA (40HNMA) TU 14-1-1885-85. Quenching in oil 840-860 °C + Vacation at 570-670 °C, cooling in water or oil. In the graph KCU KCU values are shown along the fiber/KCU across the grain
Образец 25х25	-	≥835	≥980	≥12	≥55	≥981/588	293-341	-
Образец 25х25	-	≥930	≥1080	≥12	≥50	≥784/490	320-375	-
Bars and rods of steel treated in the ladle a synthetic slag in the delivery condition on the other 14-1-658-73. Samples of the cross
	-	-	-	≥7	≥35	≥588	293-341	-
	-	-	-	≥7	≥32	≥490	320-375	-
Rolled steel. Quenching in oil from 835-865 °C + Vacation at 540-570 °C, cooling in water or oil
	-	≥930	≥1080	≥7	≥32	≥490	321-375	-
	-	≥930	≥1080	≥12	≥50	≥780	321-375	-
Rolled steel. Quenching in oil from 835-865 °C + Vacation at 570-620 °C, air cooling
	-	≥830	≥980	≥7	≥35	≥590	293-341	-
	-	≥830	≥980	≥12	≥50	≥980	293-341	-

Description mechanical marks

Name	Description
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_U	Limit short-term strength
d₅	Elongation after rupture
y	The relative narrowing
KCU	Toughness
HB	Brinell hardness number
HRC	Rockwell hardness (indenter diamond spheroconical)

Physical characteristics

Temperature	Е, HPa	G, HPa	r, kg/m³	l, W/(m · °C)	R, Mr. · m	a, 10^-6 1/°C	С, J/(kg · °C)
20	215	84	7850	39	331	-	-
100	211	81	-	38	-	116	490
200	201	77	-	37	-	121	506
300	190	73	-	37	-	127	522
400	177	68	-	35	-	132	536
500	173	66	-	33	-	136	536
600	-	-	-	31	-	136	-
700	-	-	-	29	-	-	565
800	-	-	-	27	-	139	-

A description of the physical symbols

Name	Description
Е	The normal elasticity modulus
G	Modulus of elasticity shear torsion
r	Density
l	Coefficient of thermal conductivity
R	UD. the resistivity

Technological properties

Name	The value
Weldability	Difficult weldability. Method of welding: SMAW. Necessary preheating and subsequent heat treatment.
Склонность к отпускной хрупкости	Tend not.
The temperature of forging	Beginning - 1220 °C, end - 800 °C. the cross Sections up to 80 mm is recommended with the recrystallization annealing, the two supercooling vacation.
Flock-sensitive sensitivity	Sensitive.
Machinability	In hot-rolled condition in NV 228-235 and blower SB=560 MPa Kn TV.SPL.=0,7 Kn b.St.=0,4.
Macrostructure and pollution	Macrostructure of steel when testing for the breaks in the longitudinal direction and transverse templeto selected from rolled, should not have shrinkage, porosity, bubbles, cracks, delamination, inclusions and placenow and defects of fracture, listed in Annex 3 GOST 10243. The Central porosity, point heterogeneity and phase separation in the square should not exceed 1 points; layer-by-layer crystallization and the bright loop - 3 points reference scales GOST 10243. All other defects under GOST 10243, are not allowed. Pollution steel non-metallic inclusions should be according to the average score is not higher (in points): oxides of point 1,5, 2,0 stroke oxides, silicates fragile 1,0, 1,0 silicates plastic, silicates, non-deformed 2,5, 2,5 sulfides, nitrides stroke and point 1,0.