Steel 14KH17N2 (ЭИ268)

Designation

Name	The value
Designation GOST Cyrillic	14Х17Н2
Designation GOST Latin	14X17H2
Transliteration	14H17N2
By chemical elements	14Cr17Н2

Name	The value
Designation GOST Cyrillic	ЭИ268
Designation GOST Latin	EI268
Transliteration	EhI268
By chemical elements	-

Description

14KH17N2 steel is used: for the manufacture of blades, disks, shafts, bushings, flanges, fasteners and other components; parts of compressor machines running on nitrous gas; parts operating in aggressive environments and temperatures in chemical and other industries; shaped castings and castings in investment casting for aircraft industry group I — loaded items with the specific requirements for density and mechanical properties: high load brackets, sealed the housing, the frames of gyroscopes, stabilizers, etc. and group II — non-loaded and lightly loaded parts: rings flanges, fittings, leaking instrument cabinets, etc.

Note

Steel corrosion resistant, heat resistant martensite-ferritic class.
The recommended maximum operating temperature for a long time +400 °C.
The temperature of beginning of intensive scaling in air +800 °C.
The best corrosion resistance steel has, after quenching with high vacation.

Standards

Name	Code	Standards
Sheets and strips	В23	GOST 103-2006
Bars and shapes	В22	GOST 1133-71, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Processing of metals by pressure. Forgings	В03	GOST 25054-81, OST 5Р.9125-84, TU 14-1-1530-75, ST ЦКБА 010-2004
Sheets and strips	В33	GOST 4405-75, GOST 5582-75, GOST 7350-77, TU 14-1-2186-77, TU 14-132-179-89
Classification, nomenclature and General rules	В30	GOST 5632-72
Bars and shapes	В32	GOST 5949-75, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST 18907-73, TU 14-1-2257-77, TU 14-1-2972-80, TU 14-1-3564-83, TU 14-1-377-72, TU 14-1-3957-85, TU 14-1-5038-91, TU 14-11-245-88
Steel castings	В82	OST 1 80059-83
Classification, nomenclature and General rules	В20	OST 1 90005-91
Castings with special properties (iron and steel)	В83	OST 1 90090-79
Blanks. Of the workpiece. Slabs	В21	OST 1 90176-75
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, OST 95-10-72, OST 1 90161-74
Welding and cutting metals. Soldering, riveting	В05	OST 95 10441-2002
Thermal and thermochemical treatment of metals	В04	STP 26.260.484-2004, ST ЦКБА 016-2005

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	N	Al	V	Ti	Mo	W
OST 1 90090-79	0.05-0.1	≤0.025	≤0.025	0.3-0.8	15-18	0.8-1.5	2.8-3.8	Rest	≤0.3	≤0.05	≤0.1	≤0.05	≤0.05	≤0.2	≤0.2
GOST 5632-72	0.11-0.17	≤0.025	≤0.03	≤0.8	16-18	≤0.8	1.5-2.5	Rest	≤0.3	-	-	≤0.2	≤0.2	≤0.3	≤0.2

Fe is the basis.
According to GOST 5632-72 the chemical composition is given for steel 14Х17Н2.
According to OST 1 90090-79 the chemical composition is given for steel 14Х17Н2Л (ЭИ268Л). In steel, the nitrogen content is up to 0.070%.
According to TU 14-1-2186-77 for steel smelted with electroslag remelting the content of S ≤ 0.015%.

Mechanical properties

Section, mm	t отпуска, °C	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	d	y, %	KCU, kJ/m²	HB, MPa	HRC
Rod. Annealing at 760-780 °C (exposure 2 hours), cooled with furnace + Quenching in oil with the 950-975 °C (aging 1 HR)
-	300	930-950	1260-1280	≥16	-	59-61	-	400-444	-
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	-	830-1030	-	-	-	-	229-321	21-30
Strain state. The rate of deformation of 2.5 mm/min.
-	-	-	≥215	≥58	-	≥90	-	-	-
Rod. Annealing at 760-780 °C (exposure 2 hours), cooled with furnace + Quenching in oil with the 950-975 °C (aging 1 HR)
-	400	980-1050	1290-1330	16-17	-	60-62	-	388-444	-
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	-	930-1130	-	-	-	-	255-363	27-32
Strain state. The rate of deformation of 2.5 mm/min.
-	-	-	≥145	≥70	-	≥92	-	-	-
Billet (forgings) OST 95-10-72. Quenching in oil with 950-1040 °C + Vacation, cooling in oil or air (sample)
≤100	600-650	-	-	-	-	-	-	229-285	20-29
Rod. Annealing at 760-780 °C (exposure 2 hours), cooled with furnace + Quenching in oil with the 950-975 °C (aging 1 HR)
-	500	970-1000	1110-1200	14-15	-	≥60	-	363-388	-
Strain state. The rate of deformation of 2.5 mm/min.
-	-	-	≥98	≥75	-	≥88	-	-	-
Billet (forgings) OST 95-10-72. Quenching in oil with 950-1040 °C + Vacation, cooling in oil or air (sample)
≤100	275-350	-	-	-	-	-	-	-	35-43
Strain state. The rate of deformation of 2.5 mm/min.
-	-	-	≥59	≥80	-	≥90	-	-	-
Billet (forgings) OST 95-10-72. Quenching in oil with 950-1040 °C + Vacation, cooling in oil or air (sample)
≤60	275-350	-	≥1079	≥10	-	-	≥392	321-415	-
Strain state. The rate of deformation of 2.5 mm/min.
-	-	-	≥29	≥80	-	≥90	-	-	-
Billet (forgings) OST 95-10-72. Quenching in oil with 950-1040 °C + Vacation, cooling in oil or air (sample)
≤100	600-680	≥540	≥686	≥15	-	≥40	≥588	207-285	-
Strain state. The rate of deformation of 2.5 mm/min.
-	-	-	≥20	≥80	-	≥88	-	-	-
Blank pieces of pipe fittings according to ST CKBA 016-2005. Quenching in oil with 975-1040 °C + Vacation, air cooling
≤60	275-370	≥834	≥1080	≥10	-	≥25	≥490	331-388	37-42.5
Strain state. The rate of deformation of 2.5 mm/min.
-	-	-	20	68	-	80	-	-	-
Blank pieces of pipe fittings according to ST CKBA 016-2005. Quenching in oil with 975-1040 °C + Vacation, air cooling
≤60	560-600	≥735	≥931	≥10	-	≥30	≥490	277-331	30-37
Forgings of disks with a diameter of 700 mm and a height of 30-80 mm. Annealing with two hypothermia 200-230 °C and 140-180 °C. Quenching in oil 960-980 °C + Vacation at 640-670 °C (samples tangential). At 20 °C HB=285
-	-	680-690	870-890	≥16	-	52-55	-	-	-
Blank pieces of pipe fittings according to ST CKBA 016-2005. Quenching in oil with 975-1040 °C + Vacation, air cooling
≤60	680-700	≥568	≥784	≥14	-	≥50	≥588	229-285	22.5-31
Forgings of disks with a diameter of 700 mm and a height of 30-80 mm. Annealing with two hypothermia 200-230 °C and 140-180 °C. Quenching in oil 960-980 °C + Vacation at 640-670 °C (samples tangential). At 20 °C HB=285
-	-	630-650	780	12-15	-	47-53	-	-	-
Blank pieces of pipe fittings according to ST CKBA 016-2005. Quenching in oil with 975-1040 °C + Vacation, air cooling
60-100	680-700	≥540	≥687	≥12	-	≥43	≥490	229-285	22.5-31
Forgings of disks with a diameter of 700 mm and a height of 30-80 mm. Annealing with two hypothermia 200-230 °C and 140-180 °C. Quenching in oil 960-980 °C + Vacation at 640-670 °C (samples tangential). At 20 °C HB=285
-	-	610-630	730-760	11-13	-	50-53	-	-	-
Blank pieces of pipe fittings according to ST CKBA 016-2005. Quenching in oil with 975-1040 °C + Vacation, air cooling
100-300	680-700	≥540	≥687	≥12	-	≥40	≥392	229-285	22.5-31
Forgings of disks with a diameter of 700 mm and a height of 30-80 mm. Annealing with two hypothermia 200-230 °C and 140-180 °C. Quenching in oil 960-980 °C + Vacation at 640-670 °C (samples tangential). At 20 °C HB=285
-	-	600-630	730-750	11-12	-	≥45	-	-	-
Blank pieces of pipe fittings according to ST CKBA 016-2005. Annealing at 680-700 °C (20 h exposure), air cooling with the furnace
≤60	-	≥490	≥735	≥14	-	≥50	≥588	240-260	25-28
Forgings of disks with a diameter of 700 mm and a height of 30-80 mm. Annealing with two hypothermia 200-230 °C and 140-180 °C. Quenching in oil 960-980 °C + Vacation at 640-670 °C (samples tangential). At 20 °C HB=285
-	-	500-540	560-610	≥15	-	54-56	-	-	-
Hot rolled sheet (of 1.5-3.9 mm) and cold rolled (0,7-3,9 mm) steel according to GOST 5582-75. Quenching in oil with the 950-975 °C + Vacation at 275-350 °C, air cooling
	-	-	1080-1370	≥10	-	-	-	-	-
Forgings of disks with a diameter of 700 mm and a height of 30-80 mm. Annealing with two hypothermia 200-230 °C and 140-180 °C. Quenching in oil 960-980 °C + Vacation at 640-670 °C (samples tangential). At 20 °C HB=285
-	-	280-310	330-340	28-30	-	83-84	-	-	-
The casting and the ceramic mold. Quenching in oil or a solution of liquid glass with 1040-1060 °C + Vacation at 540-560 °C (3 hours), air cooling
-	-	≥736	≥932	-	≥8	≥20	≥245	229-321	-
Rod. Annealing at 760-780 °C (exposure 2 hours), cooled with furnace + Quenching in oil with the 950-975 °C (aging 1 HR) + Vacation at 600 °C (exposure 3-6 h). At 20 °C NV=269-302
-	-	680-710	860-880	19-22	-	60-63	-	-	-
The casting and the ceramic mold. Quenching in oil or a solution of liquid glass with 1040-1060 °C + Vacation at 670-690 °C (3 hours), air cooling
-	-	≥638	≥834	-	≥8	≥20	≥245	229-321	-
Rod. Annealing at 760-780 °C (exposure 2 hours), cooled with furnace + Quenching in oil with the 950-975 °C (aging 1 HR) + Vacation at 600 °C (exposure 3-6 h). At 20 °C NV=269-302
-	-	620-640	≥720	≥16	-	65-67	-	-	-
Forgings for parts resistant to the ICC. Quenching in oil or air with 970-1020 °C + Vacation at 620-670 °C, air cooling
≤60	-	≥540	≥687	≥12	-	≥60	≥590	228-277	-
Rod. Annealing at 760-780 °C (exposure 2 hours), cooled with furnace + Quenching in oil with the 950-975 °C (aging 1 HR) + Vacation at 600 °C (exposure 3-6 h). At 20 °C NV=269-302
-	-	580-590	670-680	14-15	-	63-64	-	-	-
Forgings for parts resistant to the ICC. Quenching in oil or air with 970-1020 °C + Vacation at 620-670 °C, air cooling
100-300	-	≥540	≥687	≥12	-	≥40	≥393	228-277	-
Rod. Annealing at 760-780 °C (exposure 2 hours), cooled with furnace + Quenching in oil with the 950-975 °C (aging 1 HR) + Vacation at 600 °C (exposure 3-6 h). At 20 °C NV=269-302
-	-	510	550-570	17-18	-	68-70	-	-	-
Forgings for parts resistant to the ICC. Quenching in oil or air with 970-1020 °C + Vacation at 620-670 °C, air cooling
60-100	-	≥540	≥687	≥12	-	≥50	≥492	228-277	-
Rod. Annealing at 760-780 °C (exposure 2 hours), cooled with furnace + Quenching in oil with the 950-975 °C (aging 1 HR) + Vacation at 600 °C (exposure 3-6 h). At 20 °C NV=269-302
-	-	≥430	≥460	≥20	-	≥81	-	-	-
Forgings. Quenching in oil or air with 970-1000 °C + Vacation at 600-650 °C, air cooling
≤60	-	≥638	≥736	≥12	-	≥45	≥600	241-321	-
100-300	-	≥638	≥736	≥10	-	≥35	-	241-321	-
60-100	-	≥638	≥736	≥11	-	≥40	≥500	241-321	-
Forgings. Quenching in oil or air with 970-1000 °C + Vacation at 300-350 °C, air cooling
≤300	-	-	-	-	-	-	-	321-388	-
Forgings. Quenching in oil from 980-1020 °C + Vacation at 680-700 °C, air cooling
60-100	-	≥637	≥784	≥12	-	≥30	≥490	-	-
Bars hot rolled and forged according to GOST 5949-75. Quenching in oil 1000-1030 °C + Vacation at 620-660 °C, air cooling
	-	≥635	≥835	≥16	-	≥55	≥784	-	-
Bars hot rolled and forged according to GOST 5949-75. Quenching in oil with 975-1040 °C + Vacation at 275-350 °C, air cooling
	-	≥835	≥1080	≥10	-	≥30	≥490	-	-
Bars hot rolled and forged at STP 26.260.484-2004. Quenching in oil with 975-1040 °C + Vacation, air cooling
	275-350	≥850	≥1100	≥10	-	≥30	≥490	-	-
	680-700	≥600	≥750	≥18	-	≥45	≥686	-	-
Forming at OST 1 90176-75. Quenching in oil with 1010-1030 °C + Vacation at 670-690 °C, air cooling
	-	≥638	≥834	≥16	-	≥55	≥784	255-302	-
Forming at OST 1 90176-75. Quenching in oil with 975-1040 °C + Vacation at 275-350 °C, air cooling
	-	≥834	≥1079	≥10	-	≥30	≥490	321-388	-

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
d	Elongation after rupture
y	The relative narrowing
KCU	Toughness
HB	Brinell hardness number
HRC	Rockwell hardness (indenter diamond spheroconical)

Physical characteristics

Temperature	Е, HPa	r, kg/m³	l, W/(m · °C)	R, Mr. · m	a, 10^-6 1/°C	С, J/(kg · °C)
0	193	7750	21	720	-	-
20	197	7750	209	720	-	-
300	164	-	24	890	118	462
500	148	-	25	1040	111	-
600	133	-	26	1110	113	-
100	-	-	22	780	98	-
200	-	-	23	840	106	-
400	-	-	24	990	11	-
700	-	-	27	1130	11	-
800	-	-	28	1160	107	-
900	-	-	30	1170	114	-
1000	-	-	-	1180	114	-
1200	-	-	-	-	115	-

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
С	Specific heat

Technological properties

Name	The value
Weldability	Difficult weldability. Method of welding RDS, ARDS. Weld in the heat affected zone have a lowered resistance to the ICC and General corrosion; therefore, after welding is necessary to leave at 680-700 °C for 30-60 min.
Склонность к отпускной хрупкости	Inclined.
The temperature of forging	Start - 1250 °C, the end of - 900 °C. the cross Sections up to 350 mm cooled in air.
Machinability	In the hardened and tempered condition when HB 330 Kn TV.SPL.=0,4 Kn b.St.=0,3. To improve the machinability and the hardness HB ≤ 229, the workpiece is subjected to annealing at 620-670 °C for 4-8 h with air cooling.
Features of heat treatment	Martensite steel-ferritic class is used in the hardened and tempered condition. To achieve maximum strength steel products 14KH17N2 are subjected to hardening with 975 - 1040 °C, holding at the thickness up to 10 mm - 15 min, more than 10 mm - 15 min + 1 min per 1 mm max thickness cooling oil. Vacation at 275 - 350 °C for 2 h + 1 min 1 mm max thickness cooling - air. The heating of the parts (workpieces) in the temperature range from 500 °C to 800 °C must be carried out at a speed of not more than 200 °C per hour. In the temperature range 750 - 800 °C it is necessary to give exposure to the full heating of the charge. Further heating to the quenching temperature produced by the furnace. For parts with thickness (diameter) up to 120 mm the rate of heating is not limited and aging at a temperature of from 750 °C to 800 °C is not possible. To ensure a medium level of strength after quenching, the product is subjected to vacation at 560-650 °C for 1 hour + 1 min per 1 mm maximum material thickness, cooling air. Heat treatment this is the product of the tendency to intergranular corrosion. To achieve high corrosion resistance of steel products 14KH17N2 after quenching is subjected to vacation at 680-700 °C for 30 min + 1 min per 1 mm, the maximum thickness of the material. The heating temperature for quenching for products made from steel sheet 14KH17N2, down to 950-975 °C. Welded steel products 14KH17N2 have reduced corrosion resistance in the heat affected zone. Therefore, they need to be leave at 680-720 °C. the exposure Time -30 min + 1 min per 1 mm, the maximum thickness of the product. To reduce the residual magnetic induction in the magnetic circuit of the electromagnets of the details (blank) should be subjected to prolonged annealing. Parts included in friction and sealing shutter valves, can be subjected to surface hardening with heating by high frequency currents (HFC) with the aim of improving hardness while maintaining high mechanical properties in the core part. Surface hardening with heating HDTV applies to parts of thickness (diameter) of not less than 15 mm and is made only after a preliminary heat treatment improves the hardness to HRC 22-31. Podolka parts HDTV are only allowed in the absence of the requirements of the steel resistance to intergranular corrosion. Prolonged annealing of workpieces is applied to reduce the residual magnetic induction in the magnetic circuit of the electromagnets and provides magnetic properties to steel grade 14KH17N2 the smallest coercive force HC equal to 0.1 ka/m at a residual induction RF Of 0.5 T, the saturation induction Bs of 1.5 T at the maximum coercive force Nm 20 ka/m. Welded assemblies and steel products 14KH17N2 for improving the corrosion resistance is subjected to annealing regime: heat to 680-700 °C, exposure - 2-3 h, air cooling in the absence of the requirements of the resistance to the ICC; heat to 680-700 °C, exposure - 3-5 h air cooling when the demand resistance to the ICC.