Alloy PT-7M

Designation

Name The value
Designation GOST Cyrillic ПТ-7М
Designation GOST Latin PT-7M
Transliteration PT-7M
By 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, and their alloys В51 GOST 19807-91, TU 1-5-132-78, TU 1-5-453-78
Steel pipes and fittings to them В62 GOST 21945-76, GOST 22897-86, TU 14-3-167-73
Norms for calculation and design В02 OST 1 00154-74
Welding and cutting metals. Soldering, riveting В05 TU 1-9-922-82
Tubes of 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 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 properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2
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
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d5 Elongation after rupture
y The relative narrowing
KCU Toughness

Physical characteristics

Temperature Е, HPa r, kg/m3 l, W/(m · °C) R, Mr. · m a, 10-6 1/°C С, J/(kg · °C)
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