Steel 09KH16N4B (ЭП56; 1Х16Н4Б)

Designation

Name	The value
Designation GOST Cyrillic	09Х16Н4Б
Designation GOST Latin	09X16H4B
Transliteration	09H16N4B
By chemical elements	09Cr16Н4Nb

Name	The value
Designation GOST Cyrillic	ЭП56
Designation GOST Latin	EP56
Transliteration	EhP56
By chemical elements	-

Name	The value
Designation GOST Cyrillic	1Х16Н4Б
Designation GOST Latin	1X16H4B
Transliteration	1H16N4B
By chemical elements	1Cr16Н4Nb

Description

09KH16N4B steel is used: for the manufacture of pipes of superheaters and pipelines installations of ultra-high pressure sheet, high strength shtampovannyh and welded structures and components operating in corrosive environments; solid-rolled rings for different purposes; welding wire.

Note

Steel corrosion-resistant martensitic class.
The recommended maximum operating temperature for a very long time +650 °C. the Temperature of beginning of intensive scaling in air +850 °C.
The best corrosion resistance was found after quenching, low tempering (up to +400 °C).

Standards

Name	Code	Standards
Bars and shapes	В22	GOST 1133-71, GOST 2590-2006
Processing of metals by pressure. Forgings	В03	GOST 25054-81, TU 14-1-1530-75, TU 14-1-3018-80, ST ЦКБА 010-2004
Sheets and strips	В33	GOST 5582-75, GOST 7350-77, TU 14-1-2476-78, TU 14-1-2614-79, TU 14-1-4300-87
Classification, nomenclature and General rules	В30	GOST 5632-72
Bars and shapes	В32	GOST 5949-75, GOST 18907-73, OST 1 92049-76, TU 14-1-3564-83, TU 14-1-463-72, TU 14-11-245-88
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90
Thermal and thermochemical treatment of metals	В04	ST ЦКБА 016-2005
Welding and cutting metals. Soldering, riveting	В05	TU 14-1-1692-76
Steel pipes and fittings to them	В62	TU 14-3-525-76

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo	Nb	W
TU 14-1-463-72	0.08-0.12	≤0.012	≤0.025	≤0.5	15-16.4	≤0.6	4-4.5	Rest	≤0.2	≤0.2	-	≤0.2	0.05-0.15	≤0.2
GOST 5632-72	0.08-0.12	≤0.015	≤0.03	≤0.5	15-16.5	≤0.6	4-4.5	Rest	≤0.3	≤0.2	≤0.2	≤0.3	0.05-0.15	≤0.2
TU 14-1-2476-78	0.08-0.12	≤0.015	≤0.025	≤0.5	15-16.4	≤0.6	4-4.5	Rest	≤0.2	-	-	-	0.05-0.15	-
TU 14-1-2614-79	0.06-0.12	≤0.02	≤0.03	≤0.5	15-17	≤0.6	3.5-4.5	Rest	≤0.2	-	-	-	0.05-0.14	-

Fe is the basis.
According to TU 14-1-2614-79 the chemical composition is given for steel grade 09H16N4B (EP56). At the request of the consumer sheet steel is supplied with a sulfur content of not more than 0.015%, phosphorus not more than 0.025%. The content of residual elements and the maximum deviations in chemical composition in finished rolled products are in accordance with GOST 5632. The maximum deviation in the content of niobium plus 0.006 :.
According to TU 14-1-2476-78, the chemical composition is given for steel grade 09H16N4B (EP56), 09H16N4B-VD (EP56-VD), 09H16N4B-Ш (EP56-Ш). Deviations in chromium are allowed to be +0.10%, for nickel ± 0.050%. The sulfur content of steel obtained by the electroslag remelting method should not exceed 0.012%. In the finished product, deviations in the chemical composition of the remaining elements are allowed in accordance with GOST 5632.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa	HRC
Blank pieces of pipe fittings according to ST CKBA 016-2005 steel 09KH16N4B-sh Quenching in oil or air from 1030-1050 °C + Vacation at 600-620 °C, air cooling
≤60	≥835	≥980	≥8	≥45	≥588	269-302	30-36
60-200	≥784	≥931	≥8	≥42	≥588	269-302	30-36
Blank pieces of pipe fittings according to ST CKBA 016-2005 steel 09KH16N4B-sh Quenching in oil or air from 1030-1050 °C + Vacation at 600-620 °C, air cooling + Tempering in oil or in air, 970-990 °C + Vacation at 300-350 °C, air cooling
≤60	≥830	≥1180	≥8	≥40	≥588	345-388	39-42.5
Ring forged in OST 1 92049-76. Hardening in air, 1140-1160 °C (extract 5,0-5,5 hours) + Vacation at 600-620 °C (exposure 6 h), air cooling + Tempering in oil or air from 1030-1050 °C + Vacation at 600-620 °C + Quenching in oil or in air, 970-980 °C + Vacation at 300-370 °C
	≥930	≥1180	≥7.5	≥45	≥490	-	-
Hot rolled sheet (of 1.5-3.9 mm) and cold rolled (0,7-3,9 mm) steel according to GOST 5582-75. Annealing in air 970-1050 °C + Vacation at 300-350 °C (exposure 2 hours), air cooling
	-	≥1230	≥8	-	-	-	-
Hot rolled sheet (of 1.5-3.9 mm) and cold rolled (0,7-3,9 mm) steel according to GOST 5582-75. Annealing at 620-640 °C (delay of 4-8 h), cooling to 200-300 °C with the furnace, air cooling
≤3.9	-	≤1130	-	-	-	-	-
Hot rolled sheet (4,0-50,0 mm) and cold rolled (4,0-5,0 mm) steel according to GOST 7350-77. Annealing in air from 950-980 °C + Vacation at 300-350 °C, air cooling
	≥980	≥1230	≥8	-	-	-	-
Hot rolled sheet (4,0-50,0 mm) and cold rolled (4,0-5,0 mm) steel according to GOST 7350-77. Joke mode manufacturer
-	-	≤1030	≥13	-	-	-	-
Cold-rolled sheet (0.7 to 5.0 mm) and hot-rolled steel (3,0-6,0 mm) made of steel 09KH16N4B in the delivery condition on the other 14-1-2476-78. Annealing at 620-640 °C
-	-	≤1128	≥10	-	-	-	-
Cold-rolled sheet (0.7 to 5.0 mm) and hot-rolled steel (3,0-6,0 mm) made of steel 09KH16N4B on the other 14-1-2476-78. Hardening in air, 960-980 °C + Vacation at 300-350 °C (exposure 2 hours), air cooling
	≥980	≥1226	≥8	-	-	-	-
Forgings. Without heat treatment - as supplied
1000	≥784	≥931	≥7	≥35	≥500	-	-
Bars hot rolled and forged to 180 mm. heated to 1150±10 °C (excerpt 5-5,5 h), air cooling + Vacation at 600-620 °C, air cooling + Double treatment regime: quenching in oil or air from 1030-1050 °C + Vacation at 600-620 °C, cooling in oil or air
	≥835	≥980	≥8	≥40	≥490	-	-
	≥835	≥980	≥10	≥50	≥780	-	-
Bars hot rolled and forged to 180 mm. heated to 1150±10 °C (excerpt 5-5,5 h), air cooling + Vacation at 600-620 °C, air cooling + Tempering in oil or air from 1030-1050 °C+ Vacation at 600-620 °C, air cooling + Tempering in oil or in air, 970-980 °C + Vacation at 300-370 °C, cooling in oil or air
	≥930	≥1180	≥7	≥40	≥490	-	-
	≥930	≥1180	≥10	≥50	≥780	-	-
Plates 5-25 mm in the delivery state on the other 14-1-2614-79. Annealing + Pickling
-	-	≤1030	≥13	-	-	≤320	-
Plates 5-25 mm on the other 14-1-2614-79. Heating up to 950-980 °C, air cooling + Vacation at 300-350 °C
	≥980	≥1225	≥8	-	≥590	-	-

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)

Technological properties

Name	The value
Macrostructure and pollution	Macrostructure of steel shall be no traces of shrinkage, delamination, foreign inclusions.
Features of heat treatment	To obtain characteristic values of mechanical properties and hardness set ST CKBA 010 and to achieve maximum corrosion resistance, parts (workpiece) valves shall be subjected to hardening and tempering. 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. Welded components and steel products 09KH16N4B for improving the corrosion resistance is subjected to annealing regime: heating up to 600-620 °C, exposure - 1,5-2,0 h, air cooling.
Machinability	To improve the machinability and the hardness HB ≤ 285 workpiece is subjected to annealing at 600-630 °C for 4-8 h, cooled with the furnace to 300 °C, then in air. Also applied two-stage annealing: step 1 690-710 °C (exposure 8 h), 2 tier 570-590 (exposure 8 h), cooled with the furnace to 300 °C, then on air.