Steel D40

Designation

Name The value
Designation GOST Cyrillic D40
Designation GOST Latin D40
Transliteration D40
By chemical elements D40

Description

D40 steel is used: for the production of plate, universal broadband, bandpass and shaped rolled, intended for the manufacture of shells and other welded structures of ships and floating structures.

Note

High-strength steel.

Standards

Name Code Standards
Sheets and strips В23 GOST 5521-93
Sheets and strips В33 TU 14-1-4779-90, TU 14-1-4839-90

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu N As Al V Mo Nb
GOST 5521-93 ≤0.18 ≤0.035 ≤0.035 0.9-1.6 ≤0.2 0.15-0.5 ≤0.4 Rest ≤0.35 ≤0.008 ≤0.08 0.015-0.06 0.05-0.1 ≤0.08 0.02-0.05
Fe is the basis.
According to GOST 5521-93, the mass fraction of nitrogen is allowed up to 0.012%, provided that KCU ≥ 294 kJ / m 2 is provided in the rolled product after mechanical aging at 20 ° C. It is allowed in place of aluminum soluble in acids, to determine its total mass fraction, while the rate increases by 0.005%. Partial replacement of aluminum with titanium is allowed: the total mass fraction of aluminum and titanium should be at least 0.015%, the mass fraction of titanium - not more than 0.020%, the mass fraction of aluminum soluble in acids - not less than 0.005%. Microalloying of steel niobium and vanadium is produced jointly or by one of them.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, %
Castings according to GOST 2685-75
≥390 510-650 ≥20

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