Alloy ВТ16

Designation

Name	The value
Designation GOST Cyrillic	ВТ16
Designation GOST Latin	BT16
Transliteration	VT16
By chemical elements	ВTe16

Description

Alloy ВТ16 used: for the manufacture of fasteners (bolts, screws, rivets) and threaded parts, components aircraft designs operating at temperatures up to 350 °C.

Note

Alloy ВТ16 relates to high-strength (a+b)-alloys of the system Ti-Al-Mo-V, and VT14, but differs from the latter by a lower aluminum content and a high content of R-stabilizers. In this regard, the alloy ВТ16 compared to the VT14 alloy contains more R-phase in the annealed condition (10% in VT14, 25−30% in ВТ16). Due to the high content of R-phase alloy ВТ16 has high adaptability. It is well deformed not only hot, but also cold, due not only to (a+b)-structure, but a low content of aluminium. Although alloy ВТ16 can produce almost all kinds of semi-finished products, the bulk products are wires and rods of diameters from 4 to 20 mm, obtained by rolling or drawing. To the structure of rods, designed for production of parts, imposes rather strict requirements: it must be fine-grained and homogeneous. In addition, increased requirements to the geometric dimensions of the rods and the quality of their surface. The composition of the alloy VT 16 also defines good weldability and high ductility of the welded joint immediately after welding.
The use of alloy ВТ16 bespechivaet 1.5 times higher specific endurance limit in comparison with steel 16KHSN.

Standards

Name	Code	Standards
Non-ferrous metals, including rare, and their alloys	В51	OST 1 90013-81
Bars	В55	OST 1 90201-75, OST 1 90006-86, OST 1 90202-75, TU 1-809-63-88, TU 1-92-3-74, TU 1-92-87-83
Sheets and strips	В53	TU 1-5-010-78
Wire from nonferrous metals and their alloys	В74	TU 1-9-623-77

Chemical composition

Standard	C	Si	Fe	N	Al	V	Ti	Mo	O	Zr	H
OST 1 90013-81	≤0.1	≤0.15	≤0.25	≤0.05	1.8-3.8	4-5	Rest	4.5-5.5	≤0.15	≤0.3	≤0.015

Ti is the basis.
According to OST 1 90013-81 the total content of other impurities is ≤ 0.30%. A partial replacement of molybdenum by tungsten in an amount not exceeding 0.30% is allowed. The total content of molybdenum and tungsten should not exceed the norms specified in the table for molybdenum. 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. In the semi-finished products of alloy VT16, intended for the manufacture of fasteners (except rivets), the aluminum content should be 2.20-3.80%, and in the other types of semi-finished products 1.80-3.40%. The purpose of the rivet alloy is specified in the order.
According to OST 1 90202-75, the aluminum content should be within the range of 2.20-3.80%, and the hydrogen content ≤ 0.012%.

Mechanical properties

Section, mm	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa
The sheet is thin. Quenching + aging
-	1300-1400	5-6	-	500	302-415
The sheet is thin. Annealing
-	840-1250	12-22	-	-	-
The bars as supplied on OST 1 90201-75
-	1030-1177	≥12	≥50	-	-
Bars and rods, hot-rolled. Thermal hardening
8-20	1030-1177	≥12	≥50	≥294	-

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

Technological properties

Name	The value
Weldability	without restrictions