Alloy D20 (1200)

Designation

Name The value
Designation GOST Cyrillic Д20
Designation GOST Latin D20
Transliteration D20
By chemical elements Д20
Name The value
Designation GOST Cyrillic 1200
Designation GOST Latin 1200
Transliteration 1200
By chemical elements 1200

Description

Alloy D20 is used: for the manufacture of welded products, parts of jet engines, operating at temperatures up to 300−350 °C; weldments and tanks, working briefly at temperatures from -253 to +300 °C; the profiles with the cross-sectional area of 200 cm2 and a diameter of circumcircle up to 350mm suitable for use in the aviation industry and special machine building industries; moulded panels of constant cross section with longitudinal fins in the aircraft industry, is made by a sweep of extruded finned tubes in the plane of the width of the fabric up to 2100 mm; large extruded pipes.

Note

High-strength alloy (σin=380 MPa, σ1000150° =280 MPa).

Standards

Name Code Standards
Bars and shapes В52 GOST 13616-97, GOST 13617-97, GOST 13618-97, GOST 13619-97, GOST 13620-90, GOST 13621-90, GOST 13622-91, GOST 13623-90, GOST 13624-90, GOST 13737-90, GOST 13738-91, GOST 17575-90, GOST 17576-97, GOST 29296-92, GOST 29303-92, GOST Р 50066-92, GOST Р 50067-92, GOST Р 50077-92, OST 1 92093-83, OST 1 92041-90, OST 1 92069-77, OST 1 90113-86
Sheets and strips В53 GOST 17232-99, OST 1 90246-77, OST 1 90166-75, TU 1-2-34-76, TU 1-804-473-2009
Non-ferrous metals, including rare, and their alloys В51 OST 1 90048-90
Processing of metals by pressure. Forgings В03 OST 1 90073-85
Bars В55 OST 1 90395-91, TU 1-9-814-81
Tubes of non-ferrous metals and alloys В64 OST 1 92048-90, OST 1 92048-76, TU 1-4-163-89
Tape В54 OST 1-92006-79
Welding and cutting metals. Soldering, riveting В05 TU 1-9-210-81

Chemical composition

Standard Mn Si Fe Cu Al Ti Zn Zr Mg
OST 1 90048-90 0.4-0.8 ≤0.3 ≤0.3 6-7 Rest 0.1-0.2 ≤0.1 ≤0.2 ≤0.05
TU 1-804-473-2009 0.4-0.8 ≤0.3 ≤0.3 6-7 Rest 0.1-0.2 ≤0.1 ≤0.2 ≤0.05
Al is the base.
According to OST 1 90048-90 mass fraction of each other impurity (not regulated) ≤ 0.05%, total mass fraction of other impurities ≤ 0.10%.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % d HB, MPa
Rolled steel in the delivery state
≥240 ≥360 - ≥8 ≥100
The tape is able to supply for OST 1-92006-79
0.8-10.5 - ≤235.2 - ≥15 -
5-10.5 ≥254.8 ≥362.6 - ≥7 -
Panels are extruded with fins on OST 1 92041-90 on delivery
≥235 ≥345 ≥8 - -
Plate in the delivery condition on the other 1-804-473-2009
11-80 - ≥275 - ≥12 -
11-80 - ≥275 - ≥12 -
Plates according to GOST 17232-99 in the delivery condition (transverse specimens)
11-80 - ≥275 - ≥12 -
11-80 ≥275 ≥370 - ≥8 -
Forgings up to 200 mm and forming up to 150 mm OST 1 90073-85. Mode T1: Quenching + artificial aging (indicated by the direction of samples)
- ≥365 - ≥4 ≥100
≥255 ≥375 - ≥10 ≥100
Extruded normal strength with the cross-sectional area 200 cm2 and a diameter of circumcircle up to 350mm (sample a longitudinal, in cross-section shows the thickness of the shelf). Quenching + artificial aging
≥235 ≥345 - ≥8 -
Extruded normal strength with the cross-sectional area 200 cm2 and a diameter of the circumscribed circle of up to 350 mm. (sample longitudinal cross-section shows the thickness of the shelf). Quenching + natural aging
- ≤275 - ≥12 -
Large-size extruded tubes according to OST 1 92048-76 on delivery
≥235 ≥353 - ≥7 -

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
d Elongation after rupture
HB Brinell hardness number