Steel 20Н3ДМЛ

Designation

Name The value
Designation GOST Cyrillic 20Н3ДМЛ
Designation GOST Latin 20H3DML
Transliteration 20N3DML
By chemical elements 20Н3CuMo

Description

20Н3ДМЛ steel is used: for the manufacture of large shaped castings high-strength complex form of diverse, loaded with details of shipbuilding with wall thickness up to 130 mm; parts operating at low temperatures.

Standards

Name Code Standards
Steel castings В82 OST 5Р.9285-95

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu Mo
OST 5Р.9285-95 0.17-0.22 ≤0.025 ≤0.025 0.4-0.7 0.3-0.4 0.17-0.37 3.2-4.5 Rest 0.7-1 0.36-0.5
Fe is the basis.
According to OST 5R.9285-95, in the case of steel smelted in the main electric furnaces as cold-resistant (technical conditions of the order or requirements of the drawing), the sulfur and phosphorus content should not be more than 0.020% of each. As agreed by the manufacturer with the developer OST 5P.9285-95 (CRI "Prometey"), the content of sulfur and phosphorus is allowed up to 0.030% of each. Steel should be smelted in electric arc furnaces or induction furnaces with basic lining. As a charge it is allowed to use waste of high-quality steel such as AK or AL.

Mechanical properties

sT|s0,2, MPa σU, MPa d y, % KCU, kJ/m2 HB, MPa
Castings for shipbuilding. Normalization at 900-950 °C + quenching in water from 900-930 °C + vacation at 640-670 °C, cooling in water
≥558 ≥686 ≥17 ≥40 ≥882 -
Castings for shipbuilding. Normalization at 900-950 °C + vacation at 640-670 °C, cooling in water
≥490 ≥588 ≥15 ≥45 ≥490 -
Castings for shipbuilding. Vacation at 640-670 °C, cooling in water
- - - - - 159-229

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
d Elongation after rupture
y The relative narrowing
KCU Toughness
HB Brinell hardness number

Technological properties

Name The value
Weldability welded without any restrictions. The welding process - SMAW. With a significant amount of welding it is recommended that subsequent vacation.