10Х12Н3М2ФА steel (CSD-M)

Designation

Name	The value
Designation GOST Cyrillic	10Х12Н3М2ФА
Designation GOST Latin	10X12H3M2FA
Transliteration	10H12N3M2FA
By chemical elements	10Cr12Н3Mo2V

Name	The value
Designation GOST Cyrillic	ЦД-М
Designation GOST Latin	TsD-M
Transliteration	TsD-M
By chemical elements	ZnCu-Mo

Description

10Х12Н3М2ФА steel is used: for the manufacture of forgings of the rotor disc and other details of steam and gas turbines.

Note

Chromium-Nickel steel of austenitic-ferritic class.

Standards

Name	Code	Standards
Blanks. Of the workpiece. Slabs	В31	TU 24.11.015-90

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	N	Al	V	Mo
TU 24.11.015-90	0.08-0.12	≤0.015	≤0.02	≤0.6	11-12.5	≤0.3	2.5-2.9	Rest	≤0.05	≤0.05	0.2-0.35	1.45-1.75

Fe is the basis.
According to TU 24.11.015-90 the chemical composition is presented for the steel of the initial melting of forged blanks 10Х12Н3М2ФА-Ш (ЦД-М-Ш) of electroslag remelting. Deviations from the chemical composition are permissible: carbon ± 0.010%, chromium + 0.50%, nickel ± 0.10%, molybdenum ± 0.10%, silicon ± 0.10%. Deviations for the rest of the elements must comply with GOST 4543. It is allowed to introduce a technological additive of cerium by calculation in an amount not exceeding 0.020%. When steel is smelted on pure charge materials, the mass fraction of phosphorus must meet the requirements of the table; when used in the smelting of waste, the mass fraction of phosphorus should not be more than 0.0250%. The residual content of hydrogen in the metal of blanks should not exceed 2.5 cm ³ per 100 grams of metal. the results of determination of the hydrogen content are not acceptance tests, but are to be entered in the blank passport.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa
Billet forged wheels rotors THAT 24.11.015-90. After final heat treatment (samples, tangential and longitudinal)
	780-950	≥885	≥15	≥45	≥590	≥285
	≥715	≥860	≥12	≥40	-	-
	≥520	≥665	≥10	≥40	-	-

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

Technological properties

Name	The value
Macrostructure and pollution	The macrostructure of the etched surface of the disk blank on the other 24.11.015-90 should not have cracks, placenow, looseness, cavities, large non-metallic inclusions and clusters of small inclusions, sekulow, captured and foreign bodies On the etched surface of each side of the workpiece are not allowed separate isolated non-metallic inclusions with the size from 1 to 2 mm, inclusive over 10 PCs non-metallic inclusions up to 1 mm inclusive shall not be counted. The location of inclusions in a chain is not allowed. Chain non-metallic inclusions should be considered as inclusions up to 2 mm, are located on the same line in the amount of at least 5 pieces with distance between them not exceeding three times the length of the longest inclusion in the chain. Accumulation of non-metallic inclusions should be considered the group of associated defects, including up to 1 mm inclusive more than 10 PCs, with distance between them not exceeding five times the length of the longest inclusion, which is included in the cluster. The presence of large inclusions larger than 2 mm or a larger number of small inclusions may be allowed by agreement with the consumer.