Alloy D20 (1200)

Designation

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

Name	The value
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 (σ_in=380 MPa, σ₁₀₀₀^150° =280 MPa).

Standards

Name	Code	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
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	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	d	HB, MPa
Section, mm	s_T\|s_0,2, MPa	σ_U, 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
Name	Description
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_U	Limit short-term strength
d₅	Elongation after rupture
d	Elongation after rupture
HB	Brinell hardness number