Arc welding
TIG and MIG with Al-Mg fillers such as ER5356 or ER5183 (or the Russian Св-АМг5 / Св-АМг6 types). Clean oxide and keep heat input moderate.
GOST alloy guide
1920 (В92) Aluminium Alloy (GOST)
1920, known by its letter name В92 (V92 or B92 in Latin script), is a Russian weldable aluminium alloy with about 4.3 % magnesium, 3.2 % zinc and 0.8 % manganese. It sits between the non-heat-treatable АМг (5xxx-type) alloys and the high-zinc 7xxx grades: it can be aged to higher strength than АМг5 or АМг6 while staying weldable. It is supplied as plate, sheet, extrusions and forgings for welded structures.
- System
- Al-Mg-Zn-Mn
- Density
- 2.72 g/cm³
- Key feature
- Weldable, heat-treatable
- Forms
- Plate, sheet, extrusions, forgings
What is 1920 (В92) aluminium alloy?
GOST 4784 lists 1920 in its table of Al-Zn-Mg alloys, together with 1901 and 1915, although in 1920 magnesium is actually the larger addition. Its magnesium level of 3.9–4.6 % is similar to 5083, while 2.9–3.6 % zinc allows a precipitation-hardening response that pure Al-Mg alloys do not have.
The result is an alloy that behaves in welding much like a 5xxx grade but can be quenched and aged for extra strength. The welded heat-affected zone, briefly heated to solution temperature, regains part of its strength by natural ageing afterwards, a property shared with other weldable Al-Zn-Mg alloys such as 7020 and 7005.
In Western systems there is no registered alloy with the same composition. Its nearest relatives in purpose are 7020 and 7005 (weldable Al-Zn-Mg) and 5083 / 5456 (high-Mg Al-Mg). A substitute must be chosen by properties, not by name.
Standards and designations
| Document | Content |
|---|---|
| GOST 4784-97 / GOST 4784-2019 | Grade designation (1920 / В92) and chemical composition |
| OST 1 92014-90 | Aerospace-industry standard for wrought alloy grades and composition |
| GOST 17232 / GOST 21631 | Plate and sheet product standards (where the grade is listed or agreed) |
| GOST 8617 and related profile standards | Extruded sections and shapes |
| Mill technical conditions (ТУ) | Often govern specific forms and tempers for this grade |
Older drawings may use only the letter name В92, newer ones only the number 1920. Always state the exact designation and governing document on drawings and orders.
1920 chemical composition (wt %)
Limits from GOST 4784-97. Single values are maximums.
| Element | Limit (%) | Role |
|---|---|---|
| Magnesium (Mg) | 3.9 – 4.6 | Solid-solution strength, corrosion resistance |
| Zinc (Zn) | 2.9 – 3.6 | Enables precipitation hardening with Mg |
| Manganese (Mn) | 0.6 – 1.0 | Strength and grain structure control |
| Titanium (Ti) | ≤ 0.2 | Grain refiner |
| Iron (Fe) | ≤ 0.3 | Impurity |
| Silicon (Si) | ≤ 0.2 | Impurity |
| Copper (Cu) | ≤ 0.05 | Kept very low for weldability and corrosion |
| Beryllium (Be) | 0.0001 – 0.005 | Protects the melt from oxidation |
| Others, each / total | ≤ 0.05 / ≤ 0.1 | |
| Aluminium (Al) | Remainder | About 90 – 92 % |
GOST gives a nominal density of 2.72 g/cm³. Use it for weight: 1 m² of 10 mm plate weighs 27.2 kg.
Properties and supply conditions
Properties depend on product form and condition, and guaranteed values are those of the product standard or ТУ. In general terms:
- Annealed (М): softest, for forming; strength similar to work-hardened АМг alloys
- Quenched and naturally aged (Т): higher strength with good ductility; the normal condition for welded structures because the HAZ recovers in the same way
- Quenched and artificially aged (Т1): highest strength, with more attention needed to stress-corrosion resistance
- Physical properties: elastic modulus about 70 GPa, expansion about 23–24 × 10⁻⁶ /K, thermal and electrical conductivity well below pure aluminium because of the alloy content
- Temperature limit: precipitates coarsen with long exposure above roughly 150 °C, reducing strength
Product forms and sizes
Typical supply range
- Sheet and plate
- From thin sheet up to thick plate; common widths 1200 – 2000 mm, lengths 2000 – 7000 mm
- Extrusions
- Angles, channels, T-, Z- and I-sections and special profiles to drawing
- Bar and round blanks
- Round bar and sawn discs for machining
- Forgings and slab
- Forged parts and rolling slab to order
- Processing
- Cut to length, cut to drawing, machining allowance and batch packing
Welding, forming and finishing
Resistance welding
Spot and seam welding of sheet are practical with proper surface preparation.
After welding
Allow natural ageing of the HAZ before final strength testing; protect weld toes from corrosive exposure.
Forming
Form in the annealed or freshly quenched condition, then age.
Machining
Machines well in aged condition with sharp tools; annealed material is softer and can smear.
Anodising
Anodises satisfactorily for protection; colour may be less uniform than on 6xxx alloys.
Where 1920 is used
- Welded load-bearing frames and structures in transport and special vehicles
- Marine superstructures and deck structures where more strength than АМг5 is wanted
- Aircraft and aerospace secondary structure built to GOST / OST materials
- Machine frames and welded equipment parts
- Replacement material for equipment originally designed with В92
International alternatives
| Alternative | When it fits | Watch out for |
|---|---|---|
| 7020-T6 | Welded structures needing similar or higher strength | Higher zinc; follow stress-corrosion guidance |
| 7005-T53 / T6 | Extruded welded frames | Extrusion-focused; check plate availability |
| 5083-H116 / H321 | Marine and cryogenic welded structures | Lower strength; not heat-treatable |
| 5456-H116 | Higher-strength Al-Mg plate | Sensitisation above about 65 °C |
Send the original specification and target standard and we will compare composition, guaranteed properties, temper and approvals before you change material.
References and standards
- GOST 4784-97 – Aluminium and wrought aluminium alloys. Grades (table 6)
- GOST 4784-2019 – Aluminium and wrought aluminium alloys. Grades
- OST 1 92014-90 – Wrought aluminium and magnesium alloys. Grades
- EN 573-3 – Chemical composition and form of wrought products (for 7020 / 7005 comparison)
1920 (В92) aluminium alloy: frequently asked questions
Is 1920 the same as В92?
Yes. 1920 is the digital designation and В92 the letter designation of the same GOST alloy; in Latin script it is often written V92 or B92.
Can 1920 be welded?
Yes. It is welded by TIG, MIG and resistance methods, using Al-Mg fillers such as 5356 or 5183, and the HAZ partly recovers strength by natural ageing.
Which heat treatment gives the highest strength?
Quenching followed by artificial ageing (Т1). For welded structures the naturally aged condition (Т) is often preferred.
What is the international equivalent of 1920?
There is no exact equivalent. 7020 and 7005 are the closest weldable heat-treatable alloys; 5083 and 5456 are non-heat-treatable alternatives.
What is the density of 1920?
2.72 g/cm³ according to GOST 4784.
Can Metline supply 1920 with certificates?
Yes. We supply GOST grades or agreed substitutes with mill test certificates and export packing to destinations worldwide.
Sourcing 1920 (В92)?
Send the designation, form, size, condition and quantity. We will reply with availability, certification or a suitable alternative.
