Steel 18Х2МФА-

Designation

Name	The value
Designation GOST Cyrillic	18Х2МФА-А
Designation GOST Latin	18X2MFA-A
Transliteration	18H2MFA-A
By chemical elements	18Cr2MoVN-

Description

Steel 18Х2МФА AND used: for the production of workpieces in the form of forgings, sheets, sheet blanks, the sheet of stamped blanks, Cavanaugh-rolled billets (slabs), used for products of machinery and vessels, working under pressure and within the jurisdiction of the Gosatomenergonadzor.

Standards

Name	Code	Standards
Blanks. Of the workpiece. Slabs	В31	TU 108.131-86

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	As	V	Mo	Sn	Sb	Co
TU 108.131-86	0.16-0.21	≤0.015	≤0.012	0.3-0.6	2.5-3	0.17-0.37	≤0.4	Rest	≤0.1	≤0.01	0.25-0.35	0.6-0.8	≤0.005	≤0.005	≤0.025

Fe is the basis.
According to TU 108.131-86 the chemical composition is given for steel grade 18X2MFA-A. In the chemical composition, deviations are allowed: carbon ± 0.010%, manganese, silicon, and vanadium ± 0.050% each, chromium ± 0.10%. In steel, the total content of phosphorus, antimony, and tin should not be more than 0.015%. Additional determination of the content of zinc, lead and bismuth is carried out. The results of the determination are not delivery, but are recorded in the certificate.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa
Billet heat-treated in the delivery condition on the other 108.131-86
160-400	≥430	540-735	≥14	≥50	≥490	187-229
160-400	≥390	≥490	≥14	≥50	-	-
160-400	≥430	540-735	≥14	≥50	≥490	187-229
160-400	≥390	≥490	≥14	≥50	-	-

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