Steel 15Х16Н2АМ (ЭП479)

Designation

Name	The value
Designation GOST Cyrillic	15Х16Н2АМ
Designation GOST Latin	15X16H2AM
Transliteration	15H16N2AM
By chemical elements	15Cr16Н2NMo

Name	The value
Designation GOST Cyrillic	ЭП479
Designation GOST Latin	EP479
Transliteration	EhP479
By chemical elements	-

Description

15Х16Н2АМ steel is used: for the manufacture of structural shapes, and forgings intended for subsequent cold machining or hot for subsequent machining (stamping, forging, rolling, etc.) in the manufacture of machine parts; nitride of parts for the aircraft industry; special fasteners and pipeline components for aircraft (bolts, nuts, plugs, angles, tees, pohodnikov, tubes, fittings, etc.).

Note

Corrosion-resistant case hardening steel of the martensitic class.

Standards

Name	Code	Standards
Classification, nomenclature and General rules	В20	OST 1 90005-91
Processing of metals by pressure. Forgings	В03	TU 14-1-1530-75
Bars and shapes	В32	TU 14-1-3575-83, TU 14-1-948-74, TU 14-1-1434-75

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	N	Mo
TU 14-1-1434-75	0.12-0.18	≤0.02	≤0.03	≤0.6	15-16.5	≤0.6	2-2.5	Rest	0.03-0.1	0.9-1.3

Fe is the basis.
According to TU 14-1-948-74, the chemical composition is given for steel grade 15H16N2AM-SH (EP479-SH). In the finished rolled steel, subject to the requirements of TU 14-1-948-74, deviation from the chemical composition standards is allowed: by carbon ± 0.010%, manganese ± 0.020%, silicon ± 0.020%, chromium ± 0.050%, nickel -0.050%, molybdenum ± 0.020%.
According to TU 14-1-1434-75 the chemical composition is given for steel grade 15H16N2AM-SH (EP479-Ш). In ready rolled products, deviation from the chemical composition standards is allowed: carbon ± 0.010%, manganese + 0.020%, silicon + 0.020%, chromium ± 0.050%, nickel -0.050%, molybdenum ± 0.020%. The content of residual elements must comply with GOST 5632.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa	HRC
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	880-1030	-	-	-	262-302	23-33
-	-	-	-	-	-	341-478	37-49.5
Bars hot rolled and forged on the other 14-1-948-74. Quenching in oil with 1030-1040 °C + Vacation at 550-590 °C
20-25	≥930	≥1130	≥12	≥58	≥687	294-376	-
Bars with special surface finish on the other 14-1-1434-75. Quenching in oil with 1030-1050 °C + Vacation at 640-680 °C
	≥735	≥930	≥14	≥55	≥690	277-341	-

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)

Technological properties

Name	The value
Macrostructure and pollution	The macrostructure of the steel on the other 14-1-948-74 when checking on the etched templeto should not have voids, cracks, fractures, delaminations, and inclusions that are visible to the naked eye. Evaluation of the macrostructure is produced according to the methods and scales GOST 10243. The degree of development of a point inhomogeneity, Central porosity, phase separation and square podsadecki segregation should not exceed the 1st score of the scales according to GOST 10243. The degree of development of layer-by-layer crystallization and light circuit shall not exceed 3 points scales according to GOST 10243. Other defects, classified according to GOST 10243 are not allowed.
Microstructure	The control metal on volosovichi is made by the consumer in the finished product on the other 14-1-336-72.
Particularities of production of goods	Bars hot rolled and forged on the other 14-1-948-74 are supplied in heat treated condition with a hardness on the Brinell hardness of not more than 294 (indentation diameter not less than 3.55 mm). Depending on the purpose hot rolled and forged steel are divided into subgroups: a - for hot processing by pressure; "b" for cold machining. At the request of the enterprises of the aviation industry, specified in the order, the steel sub-group "a" supply plant "Dneprospetsstal" test on the residue in the hot state, up to 1/3 of the height. In upset samples should be free of tears and cracks. Bars with a diameter or a side of a square more than 80 mm on the hot draught can not be tested at the plant of the supplier, if the latter guarantees a positive result of this test from the consumer.