Steel 16Х12МВСФБР (ЭП823)

Designation

Name	The value
Designation GOST Cyrillic	16Х12МВСФБР
Designation GOST Latin	16X12MBCFBP
Transliteration	16H12MVSFBR
By chemical elements	16Cr12MoWСVNbB

Name	The value
Designation GOST Cyrillic	ЭП823
Designation GOST Latin	EP823
Transliteration	EhP823
By chemical elements	-

Description

16Х12МВСФБР steel is used: for the manufacture of extremely thin-walled tubes; bars with special surface finish diameter mm 6−14; parts machinery for special purposes.

Standards

Name	Code	Standards
Bars and shapes	В32	TU 14-1-1135-74, TU 14-131-1126-2013
Blanks. Of the workpiece. Slabs	В31	TU 14-1-925-74
Steel pipes and fittings to them	В62	TU 14-3-349-75

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	V	B	Mo	Nb	W	Ce
TU 14-1-925-74	0.14-0.18	≤0.01	≤0.015	0.5-0.8	10-12	1-1.3	0.5-0.8	Rest	0.2-0.4	≤0.006	0.6-0.9	0.2-0.4	0.5-0.8	≤0.1

Fe is the basis.
According to TU 14-1-925-74, the chemical composition is presented for 16Х12МВССБР-Ш (ЭП823-Ш) and 16Х12МВСФБР-П (ЭП823-П) steels, smelted by electroslag and plasma arc remelting methods. The content of boron and cerium is indicated by calculation and chemical analysis is not determined. The content of titanium and nitrogen is not more than 0.050% of each. The aluminum content is not more than 0.050%, the deviation along aluminum is not a defective feature. If all requirements of the technical specification are satisfied, deviations in chemical composition are allowed in accordance with GOST 10500, as well as deviations in sulfur and phosphorus +0.0050% each, in nickel ± 0.050%.
According to TU 14-131-1126-2013 the chemical composition is presented for steel grade 16Х12МВСФБР-Ш (ЭП823-Ш). The mass fraction of residual aluminum, titanium, nitrogen content should not exceed 0.050% of each. The results of control are optional, but are entered into the certificate. Boron is introduced into steel by calculation and chemical analysis is not determined. The quality document indicates the calculated value of the mass fraction of boron. REM (cerium + lanthanum) are introduced by calculation at 0.10%. At the same time, the mass fraction of the REM is not determined by chemical analysis. The quality document indicates the calculated value of the mass fraction of the REM. Permissible deviations in chemical composition - in accordance with GOST 5632, as well as nickel ± 0.050%, sulfur and phosphorus + 0. 0050% each.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %
Bars with special surface finish on the other 14-131-1126-2013. The longitudinal samples. Annealing in air 1040-1080 °C (aging for 1 hour) + Holiday at 680-730 °C (delay 2-3 hours), air cooling
	≥590	≥780	≥16	≥50
	-	≥220	≥17	≥55
Tubular billet on the other 14-1-925-74. Annealing in air 1040-1080 °C (aging for 1 hour) + Holiday at 680-730 °C (delay 2-3 hours), air cooling (longitudinal samples)
20-25	≥590	≥785	≥16	≥50
20-25	-	≥216	≥18	≥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

Technological properties

Name	The value
Pressure treatment	Of forging of billets on the other 14-1-925-74 must be at least 3.5.
Macrostructure and pollution	In the macrostructure of billets is not allowed traces of shrinkage, porosity, bubbles, cracks, inversions brown, inclusions visible to the naked eye. The permissible defects of the macrostructure shall not exceed: Central porosity - 1 point; - point heterogeneity - 1 point; - phase separation in the square - 1 point. In the metal tube blank is allowed the presence of non-metallic inclusions by the maximum score (max): - sulphides (C)- 1.0 points, oxides stroke (OS) - 2.0 points; - point oxides (ON) - 2.0 points; - point of silicates, fragile (CT, CX) - 2.0 points, silicates plastic (SP) - 1.0 points, silicates nedeterminata (CH) - 1.0 points. Additionally controlled the content of the nitrides and carbonitrides. The inspection results shall be recorded in the certificate.