Steel 05Х12Н2М

Designation

Name	The value
Designation GOST Cyrillic	05Х12Н2М
Designation GOST Latin	05X12H2M
Transliteration	05H12N2M
By chemical elements	05Cr12Н2Mo

Description

05Х12Н2М steel is used: for the production of bars with a diameter of 6−30 mm, forged billets, pipe billets and cold-drawn pipe intended for subsequent cold machining or hot for subsequent machining (stamping, forging, rolling, etc.) in the manufacture of parts of valves and pipelines of nuclear power installations.

Note

Partenitskaya high-chromium steel.

Standards

Name	Code	Standards
Processing of metals by pressure. Forgings	В03	TU 108.11.884-87
Bars and shapes	В32	TU 14-1-2761-79, TU 14-1-2837-79, TU 14-131-979-2001
Blanks. Of the workpiece. Slabs	В31	TU 14-1-2836-79, TU 14-1-4995-91
Steel pipes and fittings to them	В62	TU 14-3-1010-81, TU 14-3-873-79

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	N	Al	Ti	Mo
TU 14-1-2836-79	≤0.05	≤0.02	≤0.02	0.3-0.8	11.5-13	0.17-0.37	1.4-2	Rest	-	≤0.03	≤0.1	-	0.8-1
TU 14-1-2761-79	0.02-0.06	≤0.01	≤0.015	0.3-0.6	11-12	0.15-0.3	1.2-1.6	Rest	≤0.08	≤0.02	≤0.15	≤0.05	0.8-1
TU 14-1-4995-91	≤0.05	≤0.02	≤0.02	0.3-0.8	11-12.5	0.17-0.37	1.2-1.8	Rest	-	≤0.03	≤0.15	-	0.8-1

Fe is the basis.
According to TU 14-1-2761-79, TU 14-131-979-2001 the chemical composition is given for steel grade 05X12N2M-VI, smelted in vacuum induction furnaces. In the metal, the residual content of tungsten, vanadium and cobalt is additionally controlled. Allowed the introduction of zirconium or yttrium not more than 0.10% (calculated) and the introduction of calcium no more than 0.050% (calculated). Deviations in chemical composition are allowed in the finished product in accordance with GOST 5632.
According to TU 14-1-2836-79, the chemical composition is given for steel grade 05X12N2M, smelted in electric arc or plasma arc furnaces. Steel smelted in plasma arc furnaces is marked with the stamp 05Х12Н2М-ПТ. In the steel deviations in chemical composition are allowed: for molybdenum ± 0.050%, for chromium-0.50%, for nitrogen + 0. 010%. Deviations in other elements and mass fraction of residual elements in accordance with GOST 5632. Modification with cerium or calcium is allowed not more than 0.10% (calculated). The mass fraction of cerium or calcium is not determined by chemical analysis.
According to TU 14-1-4995-91 the chemical composition is given for steel grades 05Х12Н2М and 05Х12Н2М-ПТ. Deviations in finished products are allowed according to the chemical composition: chromium -0.50%, nitrogen +0.010%, molybdenum ± 0.050%. Deviations in other elements and mass fraction of residual elements - according to GOST 5632. Modification of steel by cerium or calcium is not more than 0.10% (calculated). The mass fraction of cerium and calcium is not determined by chemical analysis.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²
Bars with special surface finish on the other 14-131-979-2001. The longitudinal samples. Normalization at 980±10 °C, air cooling + Vacation at 680±10 °C, air cooling
	≥450	≥650	≥15	≥60	≥785
Tubular billet on the other 14-1-2761-79. Normalization at 980±10 °C, air cooling + Vacation at 680±10 °C, air cooling
	≥392	≥569	≥18	≥65	≥1176
	≥294	≥353	≥12	≥55	-
Tubular billet on the other 14-1-2836-79 the 14-1-4995-91. Normalization at 980±10 °C, air cooling + Vacation at 680±10 °C, air cooling
	≥451	≥647	≥15	≥60	≥765
	≥343	≥451	≥12	≥55	-

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

Technological properties

Name	The value
Macrostructure and pollution	On the other 14-1-2836-79 the macrostructure of the billet should not have cracks, subcortical bubbles, residues shrinkage, foreign non-metallic microflute, delamination and other defects to the naked eye. Permitted in the macrostructure of the Central porosity, point heterogeneity and phase separation of a square no more than 2 points on the scale GOST 10243. The tubular billet is checked for the presence of non-metallic inclusions. The content of nonmetallic inclusions in the evaluation the average score must not exceed: - sulphides (S) ≤ 2,0; - oxides of point () ≤ 2,0; - oxides of stroke (OS) ≤ 3,0; - silicates fragile (CX) ≤ 3,0; - silicates plastic (SP) ≤ 3,0; - silicates undeformed (SN) ≤ 3,0.
Particularities of production of goods	On the other 14-1-2836-79 tubular billet is supplied without heat treatment. The degree okowa a tube blank must be at least 5 for a diameter of 90-160 mm and at least 4 for diameter over 160 to 180 mm inclusive.