Steel 09KH15N8JU1 (09H15N8YU; ЭИ904)

Designation

Name	The value
Designation GOST Cyrillic	09Х15Н8Ю1
Designation GOST Latin	09X15H8Ju1
Transliteration	09H15N8Yu1
By chemical elements	09Cr15Н8Al1

Name	The value
Designation GOST Cyrillic	09Х15Н8Ю
Designation GOST Latin	09X15H8Ju
Transliteration	09H15N8Yu
By chemical elements	09Cr15Н8Al

Name	The value
Designation GOST Cyrillic	ЭИ904
Designation GOST Latin	EI904
Transliteration	EhI904
By chemical elements	-

Description

09KH15N8JU1 steel is used: for the manufacture of products, working in atmospheric conditions, acetic acid and other saline environments; for the manufacture of elastic elements; welding wire used for welding parts and welding of steel structures in energy engineering; welding electrodes.

Note

Stainless steel austenitic-martensitic class.
Increased strength is achieved using tempering at temperatures of +750 °C and +850 °C.

Standards

Name	Code	Standards
Tape	В34	GOST 4986-79, TU 14-1-1740-75
Sheets and strips	В33	GOST 5582-75
Classification, nomenclature and General rules	В30	GOST 5632-72
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, TU 14-1-1213-75, TU 14-1-1214-75, TU 14-1-1833-76
Thermal and thermochemical treatment of metals	В04	STP 26.260.484-2004, ST ЦКБА 016-2005
Processing of metals by pressure. Forgings	В03	TU 14-1-1530-75
Bars and shapes	В32	TU 14-1-1831-76, TU 14-11-245-88
Welding and cutting metals. Soldering, riveting	В05	TU 14-1-997-74, TU 14-1-997-2012

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	Al	V	Ti	Mo	W
TU 14-1-997-74	0.05-0.09	≤0.02	≤0.035	≤0.8	14-16	≤0.8	7-9.4	Rest	≤0.2	0.7-1.3	-	-	-	-
TU 14-1-1831-76	0.05-0.09	≤0.02	≤0.035	≤0.7	14-15.7	≤0.7	7-9.4	Rest	-	0.7-1.3	-	-	-	-
GOST 5632-72	≤0.09	≤0.025	≤0.035	≤0.8	14-16	≤0.8	7-9.4	Rest	≤0.3	0.7-1.3	≤0.2	≤0.2	≤0.3	≤0.2

Fe is the basis.
According to TU 14-1-1831-76, deviations in chemical composition are allowed: for aluminum ± 0.020%. The content of elements guaranteed by the supplier in accordance with the requirements of GOST 5632 is allowed, except for vanadium, the content of which is allowed not more than 0.10% and titanium, the content of which is allowed not more than 0.10%.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	d₄	y, %	KCU, kJ/m²	HRC
Procurement of parts of pipeline fittings from steel 09H15N8YU at ST CKBA 016-2005: Hardening in air, 950-1000 °C (aging of 1.0 to 1.5 min/mm of maximum cross section but not less than 0.5 h) + cold Treatment at -70 °C (exposure 2 hours) + Aging at 350-400 (exposure 1-2 h), air cooling
≤200	≥882	≥1130	≥11	-	-	≥392	35.5-40.5
Cold-rolled steel strip of 0.05-2.00 mm according to GOST 4986-79 in the delivery condition. Samples. Vacation at 470-490 °C (aging 1 HR)
0.2-2	-	≥1270	-	≥4	-	-	-
0.2	-	≥1270	-	≥2	-	-	-
0.2-2	-	≥980	-	≥6	-	-	-
0.2	-	≥980	-	≥3	-	-	-
Cold-rolled steel strip of 0.05-2.00 mm according to GOST 4986-79. Normalization at 1030-1070 °C (samples)
0.2-2	-	≤1130	-	≥15	-	-	-
0.2	-	≤1130	-	≥8	-	-	-
Cold-rolled steel strip of 0.05-2.00 mm according to GOST 4986-79. Normalization at 975-1000 °C, cold treatment at -70 °C (exposure 2 hours) + Vacation at 400-500 °C (exposure for 1 h) (samples)
0.2-2	-	≥1180	-	≥5	-	-	-
0.2	-	≥1180	-	≥3	-	-	-
Hot rolled sheet (of 1.5-3.9 mm) and cold rolled (0,7-3,9 mm) steel according to GOST 5582-75. Normalization at 1040-1080 °C
-	-	≤1080	≥20	-	-	-	-
Bars hot rolled and forged on the other 14-1-1831-76. Longitudinal samples: Annealing in air or in water 965-985 °C cold treatment at minus 70 °C for 2 hours+ aged at 415-435 °C (aging for 1 h), air cooling
	≥900	≥1200	≥12	-	≥45	≥390	-
Bars hot rolled and forged at STP 26.260.484-2004. Quenching in water or air from 980-1020 °C, cold treatment at -10 °C (exposure 2 hours) + Vacation at 200 °C, air cooling
	≥700	≥950	≥18	-	≥50	≥980	-
Bars hot rolled and forged at STP 26.260.484-2004. Quenching in water or air from 980-1020 °C, cold treatment at -70 °C (exposure 2 hours) + Aging at 350-380 °C, air cooling
	≥900	≥1100	≥12	-	≥50	≥686	-
Bars hot rolled and forged at STP 26.260.484-2004. Quenching in water or air from 980-1020 °C, cold treatment at -70 °C (exposure 2 hours) + Aging at 400-480 °C, air cooling
	≥900	≥1200	≥10	-	≥45	≥392	-

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
d₄	Elongation after rupture
y	The relative narrowing
KCU	Toughness
HRC	Rockwell hardness (indenter diamond spheroconical)

Technological properties

Name	The value
Features of heat treatment	After quenching, the steel has a structure of unstable austenite with a small amount of martensite. In this state, the steel doesn't strengthen aging. Hardening as a result of ageing after pre-deformation or cold treatment products that causes the formation of martensite. Parts, components and apparatus made of nettervibration sheets, strips, extruded profiles, as well as from bars, rods and forgings, are subjected to full cycle of hardening heat treatment: a) annealing (for obtaining a structure of austenite); b) cold treatment at minus 70 °C (aging for at least 2 h, while cooling in the refrigerating chamber, the exposure time is doubled); C) aging (to achieve a specified level of properties). Products, to achieve maximum corrosion resistance, is subjected to heat treatment by mode: heating to 1000±20 °C, exposure with wall thickness up to 15 mm - 30 min; more than 15 mm - 30 min + 1-2 min per 1 mm of maximum wall thickness; cooling in water or air; cold treatment; aging at 350-380 °C, dwell time 1 hour + 1 min per 1 mm cross section; the cooling air. To obtain maximum strength characteristics of aging must be carried out at 400-480 °C, dwell time 1 hour + 1 min per 1 mm cross section, but the steel acquires the tendency to intergranular corrosion. In the hardening of products with wall thickness up to 8 mm, the cooling is carried out on the tranquil air, the products wall thickness more than 8 mm, and also products from bar and forgings are cooled in water. Slow cooling of products (with oven or in bulk) are not allowed. The gap between the operations of quenching and cold treatment should not exceed 12h. Before cold processing products shall not be subjected to heating or exposure to temperatures from 0 to minus 40 °C. cooling Time of the product from room temperature to minus 70 °C should be minimal. When obtaining low values of relative narrowing and toughness in comparison with specified in the normative documents, what is usually observed in large forgings, it is recommended obezvrezivate annealing regime: heating to 500±10 °C , exposure 30 h for sections up to 50 mm and 50 h for sections more than 50 mm. the Highest rate of bezodiazepine observed in the martensitic structure, so before bezodiazepines structure of the steel is transferred to a martensitic state by heat treatment at minus 70 °C. To obtain the desired properties after obezbolivaushee heat treatment necessary heat treatment for hardening of the regime . When hardening heat treatment products there is an increase in their size compared to tempered as 0.3-0.5 %. To obtain a yield strength of 70-80 kg/mm2 (700-800 MPa): products used for the treatment of: a) annealing according to ; b) cold treatment at a temperature of from 0 °C to minus 10 °C for 2H; C) leave at 200 °C for 2H. For best machinability steel products 09H15N8YU subjected to double heat treatment: annealing at 760-780°, exposure is 1.5-2 hours, air cooling, leave at 650-680 °C for 1.5-2 h, air cooling.