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Alloy OT4-1

Alloy VT8M-1 Alloy VT32 Alloy VT35 Alloy VT4 Alloy VT41 Alloy VT5 Alloy VT5-1 Alloy VT6 (VT6sv.) Alloy VT6C Alloy VT6h Alloy VT8 Alloy VT8-1 Alloy VT3-1 Alloy VT9 OT4 alloy Alloy OT4-0 Alloy OT4-1 Alloy OT4-2 Alloy PT-1M Alloy PT-3B Alloy PT-7M Alloy SPT-2 Alloy TC5 Alloy TC6 Alloy VT15 Alloy 14 Alloy 19 Alloy 27 Alloy 2B Alloy 37 Alloy 3M Alloy 40 Alloy 5B Alloy AT3 Alloy AT6 Alloy VT14 Alloy VT25U Alloy VT16 Alloy VT18 Alloy VT18U Alloy VT2 (VT2sv.) Alloy VT20 Alloy VT20-1 (VT20-1sv.) Alloy VT20-2 (VT20-2sv.) Alloy VT22 Alloy VT22I Alloy VT23

Designation

Name The value
Designation GOST Cyrillic ОТ4-1
Designation GOST Latin OT4-1
Transliteration OT4-1
The chemical elements SnTe4-1

Description

Alloy OT4−1 is used: for the manufacture of semi-finished products (sheets, strips, foils, strips, plates, bars, rods, profiles, tubes, forgings and forged blanks) by the method of deformation, and also ingots; longitudinally welded pipes for industrial pipelines, operating at conventional pressure PN (Pu) not more than 10 MPa and temperatures not exceeding 400 °C; welding wire diameter: 1.0−7.0 mm; thin-walled parts of complex configuration, continuously operating at temperatures of +300 °C (3000 h) and +350 °C (up to 2000 hours). In the annealed condition the alloy OT4−1 is used for the manufacture of the aircraft parts such as wing panels, flaps, inner wing kit.

Note

Alloy OT4−1 is among the most technologically advanced titanium alloys; is low-strength, alloyed and pseudo-alloy system Ti-Al-Mn. The alloy is well welded all types of welding, and the strength and ductility of welded joints is almost the same with the base metal. Full annealing is carried out at 640−690 °C (sheet semifinished products and parts of them) and when 740−790 °C (bars, forgings, stamping, etc., and parts of them); incomplete annealing at 520−560 °C.
The disadvantages of this alloy: a relatively low strength; very great tendency to hydrogen embrittlement (hydrogen content should not exceed 0,005%).

Standards

Name Code Standards
Non-ferrous metals, including rare metals, and their alloys В51 GOST 19807-91, OST 1 90000-70, OST 1 90013-81, OST 1 90002-86
Pipes steel and connecting parts to them В62 GOST 21945-76
Sheets and stripes В53 GOST 22178-76, GOST 23755-79, OST 1 90218-76, OST 1 90024-94, TU 1-5-244-76, TU 1-5-384-76, TU 1-92-41-76
Bars В55 GOST 26492-85, OST 1 92020-82, OST 1 90266-86, OST 1 90173-75, OST 1 90107-73, OST 1 90006-86, TU 1-9-672-78
Welding and cutting of metals. Soldering, riveting В05 OST 1 90015-77
Pipes from non-ferrous metals and alloys В64 OST 1 90050-72, OST 1 90050-92, TU 1-5-127-73, TU 1825-544-07510017-2004
Bulls. Blanks. Slabs В31 OST 1 90420-92
Sectional and shaped rolling В52 OST 1 92051-76, OST 1 92064-77, OST 1 90096-73, OST 1 90311-81, OST 1 90318-82, OST 1 90323-82, OST 1 90327-82

Chemical composition

Standard C Mn Si Fe N Al Ti O Zr H
GOST 19807-91 ≤0.1 0.7-2 ≤0.12 ≤0.3 ≤0.05 1.5-2.5 The rest ≤0.15 ≤0.3 ≤0.012
OST 1 90015-77 ≤0.1 0.7-2 ≤0.12 ≤0.3 ≤0.05 1.5-2.5 The rest ≤0.15 ≤0.3 ≤0.006
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. The mass fraction of copper and nickel should not be more than 0.10% (in total), including nickel not more than 0.08%.
According to OST 1 90015-77, the chemical composition is given for an alloy of a welding wire with a reduced hydrogen content.
For pipes of group A in accordance with GOST 21945-76, the maximum mass fraction of hydrogen in the alloy is set to 0.010%.

Mechanical characteristics

Section, mm sT|s0,2, MPa σB, MPa d5, % d y, % kJ/m2, кДж/м2 Brinell hardness number, MPa HRC
Ring welded at OST 1 90318-82
5-10 - 590-750 ≥13 - - - - -
Sheet metal in delivery condition (the samples across the direction of rolling)
- - ≥324 - - - - - -
Ring welded at OST 1 90318-82
10-20 - 590-780 ≥13 - - - - -
Sheet metal in delivery condition (the samples across the direction of rolling)
- - ≥294 - - - - - -
Ring welded at OST 1 90318-82
5-10 - 530-750 ≥10 - - - - -
10-20 - 530-780 ≥10 - - - - -
Ring welded at OST 1 90323-82
≤80 - 590-780 ≥15 - - - - -
> 80 - 590-780 ≥12 - - - - -
- - 530-780 ≥7 - - - - -
Ring welded at OST 1 90327-82
5-10 - 590-750 ≥13 - - - - -
10-20 - 590-780 ≥13 - - - - -
5-10 - 530-750 ≥7 - - - - -
10-20 - 530-780 ≥7 - - - - -
Sheet metal in delivery condition after annealing (samples across the direction of rolling)
0.3-0.7 - 589-785 ≥25 - - - - -
0.7-1.8 - 589-785 ≥20 - - - - -
1.8-6 - 589-785 ≥15 - - - - -
6-10.5 - 589-785 ≥13 - - - - -
The blades of aircraft engines is made by forging after annealing (compact (M) - the projected area cm2 20-250, medium (C) - 250-550 cm2, bulk (K) - 550-1500 cm 2)
М, С, К - 590-785 ≥15 - ≥35 ≥441 197-255 22-28
Plate in the delivery condition according to GOST 23755-79. Without heat treatment (samples transverse)
11-20 - 590-735 - ≥10 ≥18 - - -
20-60 - 590-735 - ≥9 ≥18 - - -
60-150 - 590-735 - ≥8 ≥14 - - -
Plate on OST 1 90024-94 in the delivery condition. Samples heat-treated (transverse)
20-60 - 590-735 - ≥9 ≥21 ≥392 - -
60-150 - 590-735 - ≥8 ≥21 ≥392 - -
11-20 - 590-735 - ≥10 ≥21 ≥392 - -
Forgings weighing up to 200 kg after annealing
101-150 - 540-736 ≥12 - ≥23 ≥392 197-255 -
151-250 - 540-736 ≥10 - ≥23 ≥392 197-255 -
100 - 589-736 ≥15 - ≥35 ≥441 197-255 -
The welding wire in degassed and etched condition delivery
1-1.4 - ≤785 - ≥7.5 - - - -
1.4-3 - ≤785 - ≥9 - - - -
3-7 - ≤785 - ≥12 - - - -
Bars hot rolled autogenie ordinary quality GOST 26492-85 (longitudinal samples)
10-12 - ≥540 ≥12 - ≥30 - - -
100-150 - ≥540 ≥10 - ≥21 ≥392 - -
12-100 - ≥540 ≥12 - ≥30 ≥441 - -
Bars hot rolled autogenie high-quality according to GOST 26492-85 (longitudinal samples)
10-12 - 590-735 ≥15 - ≥35 - - -
100-150 - 540-735 ≥13 - ≥24 ≥392 - -
12-100 - 590-735 ≥15 - ≥35 ≥441 - -
Bars and rods, hot-rolled. Annealing
≥110 - 560-735 ≥13 - ≥28 ≥490 197-255 -
65-100 - 590-735 ≥15 - ≥35 ≥441 197-255 -
10-60 - 589-736 ≥15 - ≥35 ≥441 197-255 -
Forged square bars and round after annealing
≤150 - 540-736 ≥12 - ≥23 ≥392 197-255 -
151-250 - 540-736 ≥10 - ≥23 ≥392 197-255 -
- 559-736 ≥12 - ≥28 ≥441 197-255 -
The pressed bars for OST 1 92020-82. Annealing. The longitudinal samples
100 - 588-735 - ≥15 ≥35 ≥441 - -
The tubular billet. Annealing
- 589-736 ≥15 - ≥35 ≥441 - -
Pipe the seamless hot-rolled, heat-treated in the delivery condition according to GOST 21945-76
≥490 588-735 ≥12 - ≥35 ≥440 - -
Pipe autogenie with etched surface and rolled, drawn, with outer diameter of 6.0-mm 62,0
- 600-750 ≥12 - - - - -

Description mechanical marks

Name Description
Section Section
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σB Limit short-term strength
d5 Elongation after rupture
d Elongation after rupture
y The relative narrowing
kJ/m2 Toughness
HRC Rockwell hardness (indenter diamond spheroconical)

Physical characteristics

Temperature Е, ГПа r, кг/м3 l, Вт/(м · °С) R, НОм · м a, 10-6 1/°С С, Дж/(кг · °С)
20 110 4550 963 1010 - -
100 - - 1047 - 8 -
200 - - 113 - 8 565
300 - - 1214 - 91 628
400 - - 1424 - 96 67
500 - - 1465 - 97 754
600 - - 1632 - 98 -

A description of the physical symbols

Name Description
Е The normal elasticity modulus
r Density
l Coefficient of thermal conductivity
R UD. the resistivity
С Specific heat

Technological properties

Name The value
Weldability Without restrictions. When welding method nepreryvnogo automatic argon-arc welding, the following welding materials: tungsten electrodes, EVI-1, EVI-2, AVL GOST 23949; the filler wire brand VT1-Oosw GOST 27265; argon sort of "higher" and "first" GOST 10157.
Pressure treatment Alloy OT4-1 in well-deformed in hot and cold conditions and are intended primarily for the manufacture of sheets, tapes and strips, of tubular billets and pipes. It is obtained also plates, forgings, rods and profiles. Sheet stamping parts of simple shape can be produced in cold condition; for stamping parts of complex shape required is heated to 500 °C.

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