Alloy PT-7M
Designation
| Name |
The value |
| Designation GOST Cyrillic |
ПТ-7М |
| Designation GOST Latin |
PT-7M |
| Transliteration |
PT-7M |
| The chemical elements |
ПTe-7Cu |
Description
Alloy PT-7M is used: for the production 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; thin-walled welded components (high ductility of the alloy allows to obtain from it particularly thin-walled tubes); various kinds of pipelines operating at room and elevated temperatures in aggressive environments; pipe items ship vacuum desalination plants; degassed titanium welding wire diameter 1,0−7,0 mm.
Note
The alloy has good corrosion resistance. Alloy PT-7M relates to alloyed, low-strength and high-ductility alloys of Ti-Al-Zr. It is quite easy to deform not only at high but also at room temperature, which due to the small content of aluminum.
Standards
| Name |
Code |
Standards |
| Non-ferrous metals, including rare metals, and their alloys |
В51 |
GOST 19807-91, TU 1-5-132-78, TU 1-5-453-78 |
| Pipes steel and connecting parts to them |
В62 |
GOST 21945-76, GOST 22897-86, TU 14-3-167-73 |
| Norms of calculation and design |
В02 |
OST 1 00154-74 |
| Welding and cutting of metals. Soldering, riveting |
В05 |
TU 1-9-922-82 |
| Pipes from non-ferrous metals and alloys |
В64 |
TU 14-3-615-77, TU 5.961-11774-2001, TU 14-3-1819-91, TU 14-3-820-79 |
Chemical composition
| Standard |
C |
Si |
Fe |
N |
Al |
Ti |
O |
Zr |
H |
| GOST 19807-91 |
≤0.1 |
≤0.12 |
≤0.25 |
≤0.04 |
1.8-2.5 |
The rest |
≤0.15 |
2-3 |
≤0.006 |
Ti is the basis.
According to GOST 19807-91, the total content of other impurities is ≤ 0.30%. The mass fraction of hydrogen is indicated for ingots. The mass fraction of chromium and manganese should not exceed 0.15% (in total). The mass fraction of copper and nickel should not be more than 0.10% (in total), including nickel not more than 0.08%.
For pipes of group A in accordance with GOST 21945-76, the maximum mass fraction of hydrogen in the alloy is set to 0.005%.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
| The billet according to TU 1-5-132-78. Annealing |
| Образец 15х15 |
≥373 |
470-637 |
≥18 |
≥36 |
≥1020 |
| Pipe seamless cold-rolled and cold-drawn, heat-treated in the delivery condition according to GOST 22897-86 (longitudinal samples) |
| - |
≥372 |
470-666 |
≥20 |
- |
- |
| The billet according to TU 1-5-132-78. Annealing |
| Образец 15х15 |
≥176 |
≥245 |
- |
- |
- |
| Pipe seamless cold-rolled and cold-drawn, heat-treated in the delivery condition according to GOST 22897-86 (longitudinal samples) |
| - |
- |
≥235 |
- |
- |
- |
| The metal tube elements of ship vacuum desalination plants on the EAST 5.4141-75 |
|
≥372 |
470-666 |
≥20 |
- |
- |
| Wire welding degassed on the other 1-9-922-82 |
| 1.0; 1.2 |
- |
441-637 |
≥16 |
- |
- |
| 1.4-7 |
- |
441-588 |
≥20 |
- |
- |
| Rolled steel in delivery condition (longitudinal samples) |
| 1-2 |
450-600 |
500-650 |
≥30 |
- |
≥980 |
|
380-550 |
480-680 |
15-25 |
≥40 |
≥880 |
| Pipe the seamless hot-rolled, heat-treated in the delivery condition according to GOST 21945-76 |
|
≥372 |
470-686 |
≥18 |
≥36 |
≥780 |
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 |
| y |
The relative narrowing |
| kJ/m2 |
Toughness |
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 |
112 |
4490 |
- |
1080 |
- |
- |
| 100 |
- |
- |
93 |
1270 |
88 |
- |
| 200 |
- |
- |
105 |
1400 |
89 |
625 |
| 300 |
- |
- |
119 |
1520 |
92 |
659 |
| 400 |
- |
- |
133 |
- |
94 |
69 |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| r |
Density |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
Technological properties
| Name |
The value |
| Weldability |
without restrictions |
