Alloy VT22

Designation

Name	The value
Designation GOST Cyrillic	ВТ22
Designation GOST Latin	BT22
Transliteration	VT22
By chemical elements	ВTe22

Description

Alloy VT22 is used: for the manufacture of semi-finished products (sheets, strips, foils, strips, plates, bars, rods, profiles, tubes, forgings and forged blanks) by the strain, and bars; high-loaded parts and structures, continuously operating at temperatures up to +350−400 °C (up to 2000 hours); power in aircraft fuselage parts, wing, forgings, parts, control systems, fasteners of the type ushkovyh bolts. High strength alloy with a strength of 1250 MPa and high hardenability (to 200 mm) for large power structures of the glider.

Note

Alloy VT22 (a+b) class refers to signalground high strength alloys of the system Ti-Al-Mo-V-Fe-Cr. The content of b-stabilizing elements in alloy VT22 close to the second critical concentration (K*~of 1.0). Structure and properties of VT22 alloy are highly dependent on fluctuations of the chemical composition within the limits set by the specifications. Depending on the content of alloying elements the structure after quenching from the b-region can be represented by one or b-phase or b-phase and martensite. Thus, the structure in the hardened state is an alloy of the transition class.
The alloy has good technological plasticity during hot metal forming.
Alloy welded satisfactorily by fusion welding, argon arc welding, submerged arc welding, roller and spot welded. After welding it is necessary to conduct annealing to improve mechanical properties of welded joints.

Standards

Name	Code	Standards
Non-ferrous metals, including rare, and their alloys	В51	GOST 19807-91, OST 1 90013-81, TU 1-92-2-72, TU 1-92-25-74, TU 1-92-34-75, TU 1-92-36-75, TU 1-92-37-75, TU 1-92-57-79
Bars	В55	GOST 26492-85, OST 1 90266-86, OST 1 90173-75, OST 1 90107-73, OST 1 90006-86, TU 1-92-104-86, TU 1-92-22-74, TU 1-92-38-75
Sheets and strips	В53	OST 1 90024-94, TU 1-92-31-74
Bars and shapes	В52	OST 1 92051-76
Tubes of non-ferrous metals and alloys	В64	TU 1-5-126-84, TU 1-5-127-73, TU 1-9-806-81
Processing of metals by pressure. Forgings	В03	TU 1-92-35-75

Chemical composition

Standard	C	Cr	Si	Fe	N	Al	V	Ti	Mo	O	Zr	H
OST 1 90013-81	≤0.1	0.5-1.5	≤0.15	0.5-1.5	≤0.05	4.4-5.7	4-5.5	Rest	4-5.5	≤0.18	≤0.3	≤0.015

Ti is the basis.
According to GOST 19807-91 and OST 1 90013-81 the total content of other impurities is ≤ 0.30%. The mass fraction of hydrogen is indicated for ingots. In the alloy, a partial replacement of molybdenum by tungsten in an amount not exceeding 0.3% is allowed. The total mass fraction of molybdenum and tungsten should not exceed the norms specified in the table for molybdenum. The mass fraction of copper and nickel should not be more than 0.10% (in total), including nickel not more than 0.08%.

Mechanical properties

Section, mm	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa
Plate on OST 1 90024-94 in the delivery condition. Samples heat-treated (transverse)
11-60	1080-1280	≥6	≥16	≥245	-
Plates with a thickness of 20-60 mm in the delivery state on the other 1-92-31-74 after annealing and surface treatment, abrasive wheel
	≥1080	≥6	≥16	≥245	-
Forgings heat-treated in the delivery condition on the other 1-92-35-75
	1080-1275	≥8	≥16	≥245	285-388
	1030-1275	≥5	≥14	≥245	285-388
	1030-1275	≥7	≥15	≥245	285-388
Bars hot rolled quenched and aged high-quality according to GOST 26492-85 (longitudinal samples)
10-12	≥1280	≥7	≥18	-	-
12-40	≥1280	≥7	≥18	≥196	-
40-60	≥1280	≥6	≥16	≥176	-
Bars hot rolled autogenie ordinary quality GOST 26492-85 (longitudinal samples)
10-12	≥1030	≥8	≥20	-	-
100-150	≥1030	≥6	≥14	≥196	-
12-100	≥1030	≥8	≥16	≥245	-
Bars hot rolled autogenie high-quality according to GOST 26492-85 (longitudinal samples)
10-12	1080-1230	≥10	≥30	-	-
100-150	1080-1280	≥7	≥17	≥245	-
12-35	1080-1230	≥10	≥30	≥294	-
35-60	1080-1230	≥9	≥25	≥294	-
60-100	1080-1280	≥8	≥18	≥245	-
Forged square bars and round after annealing
140-250	1079-1275	≥6	≥14	≥294	285-388
	1079-1275	≥8	≥20	≥294	285-388
Bars forged heat-treated on the other 1-92-38-75 (under condition of delivery - the direction of cutting out of samples)
65-100	1080-1275	≥6	≥16	≥245	285-388
101-150	1030-1275	≥6	≥15	≥245	285-388
151-250	1030-1275	≥5	≥13	≥245	285-388
The tubular billet. Annealing
-	≥1030	≥6	≥14	≥294	-
Forming in the state of delivery on the other 1-92-34-75 heat-treated according to the instructions TION 685-69 or VIAM. The longitudinal samples
-	1080-1275	≥7	≥16	≥245	285-376
≤100	1080-1275	≥6	≥16	≥245	285-376
101-250	1030-1275	≥6	≥16	≥245	285-376
≤250	1030-1275	≥6	≥16	≥245	285-376

Description mechanical marks

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

Physical characteristics

Temperature	r, kg/m³	l, W/(m · °C)	R, Mr. · m	a, 10^-6 1/°C	С, J/(kg · °C)
20	4600	832	1530	-	-
100	-	921	-	8	-
200	-	105	-	82	565
300	-	117	-	84	586
400	-	134	-	86	649
500	-	146	-	88	712
600	-	159	-	-	-

A description of the physical symbols

Name	Description
Е	The normal elasticity modulus
l	Coefficient of thermal conductivity
R	UD. the resistivity