Alloy ВТ25У

Designation

Name	The value
Designation GOST Cyrillic	ВТ25У
Designation GOST Latin	BT25U
Transliteration	VT25U
By chemical elements	ВTe25У

Description

Alloy ВТ25У used: for the manufacture of parts for high-pressure compressor of aircraft engines (rotor blades, disks), operating at temperatures up to +550 °C; parts of gas turbine engines operating in the temperature range of +450−550 °C.

Standards

Name	Code	Standards
Bars	В55	OST 1 90006-86, TU 1-92-51-77
Non-ferrous metals, including rare, and their alloys	В51	OST 1 90013-81, OST 1 90197-89, TU 1-92-117-87

Chemical composition

Standard	C	Si	Fe	N	Al	Ti	Mo	Sn	W	O	Zr	H
OST 1 90013-81	≤0.1	0.1-0.3	≤0.15	≤0.04	6-7	Rest	3.5-4.5	1-2.5	0.4-1.5	≤0.15	3-4.5	≤0.01

Ti is the basis.
According to OST 1 90013-81 the total content of other impurities is ≤ 0.30%. The total content of copper and nickel in an amount not exceeding 0.10% is allowed, including nickel not more than 0.080%. The total content of chromium and manganese in an amount not exceeding 0.15% is allowed.

Mechanical properties

Section, mm	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²
Forged discs and shafts after heat treatment OST 1 90197-89 (samples cut in Cordova direction; specified blank weight categories)
≤25	1080-1280	≥8	≥18	≥294
Forged discs and shafts after heat treatment OST 1 90197-89
-	≥835	-	-	-
Forged discs and shafts after heat treatment OST 1 90197-89 (samples cut in Cordova direction; specified blank weight categories)
25-100	1080-1280	≥6	≥15	≥274
Forged discs and shafts after heat treatment OST 1 90197-89
-	≥785	-	-	-
Forged discs and shafts after heat treatment OST 1 90197-89 (samples cut in Cordova direction; specified blank weight categories)
100-200	1080-1280	≥6	≥14	≥255

Description mechanical marks

Name	Description
σ_U	Limit short-term strength
d₅	Elongation after rupture
y	The relative narrowing
KCU	Toughness