Steel 30ХГСН2МА (30KHGSNMA)

Designation

Name	The value
Designation GOST Cyrillic	30ХГСН2МА
Designation GOST Latin	30XGCH2MA
Transliteration	30HGSN2MA
By chemical elements	30CrMnСН2Mo

Name	The value
Designation GOST Cyrillic	30ХГСНМА
Designation GOST Latin	30XGCHMA
Transliteration	30HGSNMA
By chemical elements	30CrMnСНMo

Description

30ХГСН2МА steel is used: for the manufacture of long products; pipe, the most critical parts of the aircraft.

Note

High strength steel construction high-quality, bromocinnamaldehyde.

Standards

Name	Code	Standards
Steel pipes and fittings to them	В62	GOST 21729-76, TU 14-3-674-78, TU 14-3-675-78
Classification, nomenclature and General rules	В20	OST 1 90005-91
Norms for calculation and design	В02	PI 1.2.053-78
Blanks. Of the workpiece. Slabs	В31	TU 14-1-1687-76, TU 1-92-156-90
Bars and shapes	В32	TU 14-1-1885-85, TU 14-1-392-72

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	Mo
TU 14-1-1885-85	0.27-0.33	≤0.011	≤0.015	1-1.2	0.9-1.2	0.9-1.2	1.4-1.8	Rest	≤0.25	0.3-0.4
TU 14-3-674-78	0.28-0.34	≤0.005	≤0.025	0.8-1.1	0.8-1.1	0.9-1.2	1.8-2.1	Rest	-	0.35-0.45
TU 14-1-392-72	0.27-0.34	≤0.025	≤0.025	0.8-1.1	0.9-1.2	0.9-1.2	1.4-1.8	Rest	-	0.3-0.4
GOST 21729-76	0.27-0.34	≤0.025	≤0.025	1-1.3	0.9-1.2	0.9-1.2	1.4-1.8	Rest	≤0.2	0.3-0.45

Fe is the basis.
According to GOST 21729-76 the chemical composition is given for steel 30ХГСНМА. Steel grade 30ХГСНМА-ВД should have: manganese 1.00-1.20%, sulfur ≤ 0.011%, phosphorus ≤ 0.015%, total mass fraction of sulfur and phosphorus should not exceed 0.22%, when steel is smelted with skapprocess the mass fraction of copper should be ≤ 0.25%.
According to TU 14-3-674-78 the chemical composition is given for steel 30ХГСН2МА-ВД.
According to TU 14-1-392-72 the chemical composition is given for steel 30ХГСН2МА. In the finished rolled steel, subject to the requirements of the technical specification, deviations from the chemical composition standards are allowed in accordance with Table 2 of CSTM 1-950-70, except for carbon, the deviation in which is not allowed. The presence of residual copper in steel should not exceed 0.25%. To ensure the required grain size during steel smelting, it is allowed to introduce vanadium from the calculation of its content in steel no more than 0.10%. Vanadium is not determined by chemical analysis.
According to TU 14-1-1885-85 the chemical composition is given for steel 30ХГСН2МА-ВД. In steel, the sum of the content of phosphorus and sulfur should not exceed 0.022%. 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 permissible deviation in the content of manganese in steel is + 0.010 / -0.020%, in carbon content + 0.010%, in sulfur and phosphorus content, provided that their total content is not more than 0.022%. For steel certified by the Quality mark, the sulfur content in steel shall not exceed 0.010%, while deviations from the content of sulfur and phosphorus in steel are allowed, provided that their total content is not more than 0.021%.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa	HRC
Pipe seamless cold drawn, cold rolled and toplocatie, heat-treated in the delivery condition according to GOST 21729-76
	-	≥588	≥15	-	-	-	-
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	1470-1670	-	-	-	415-462	43.5-47.5
-	-	1570-1810	-	-	-	-	45.5-51
-	-	1670-1860	-	-	-	-	47.5-51.5
Bars of steel grade 30ХГСН2МА on the other 14-1-1885-85. Quenching in oil with 890-910 °C + Vacation at 200-300 °C, air cooling. In the graph KCU KCU values are shown along the fiber/KCU across the grain
	≥1375	≥1670	≥9	≥45	≥588/343	≤444	-
	≥1375	≥1620	≥9	≥45	≥588/343	≤444	-
Bars on the other 14-1-392-72. Quenching in oil at 890-910 °C + Vacation at 200-230 °C
	-	≥1569	≥9	≥45	≥588	-	-
Bars and shapes. Quenching in oil with 890-910 °C + Vacation at 200-300 °C, air cooling
	-	≥1570	≥9	≥45	≥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 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.