Steel D

Designation

Name The value
Designation GOST Cyrillic Д
Designation GOST Latin D
Transliteration D
By chemical elements Cu

Description

The steel D is used: for the production of billets of circular cross-section of steel treated liquid synthetic slag in the ladle and is intended for the production of seamless pipes gorjachedeformirovannye.

Standards

Name Code Standards
Blanks. Of the workpiece. Slabs В31 TU 14-1-3500-82

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu
TU 14-1-3500-82 0.41-0.78 ≤0.015 ≤0.04 0.65-0.9 ≤0.3 0.17-0.37 ≤0.3 Rest ≤0.25
Fe is the basis.
According to TU 14-1-3500-82 in the pipe blank, the content of residual elements in D grade steel should not exceed the requirements of GOST 380. In finished rolled products, tolerances in chemical composition should not exceed GOST 380 standards, with the exception of sulfur and phosphorus, in which deviations not allowed. The total content of sulfur and phosphorus should not be more than 0.050%.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % KCU, kJ/m2
Tubular billet on the other 14-1-3500-82. Normalization
25 ≥373 ≥638 ≥19 ≥590

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
KCU Toughness

Technological properties

Name The value
Macrostructure and pollution The macrostructure of billets on the other 14-1-3500-82 shall conform to the requirements of OST 14-21-77. Contamination of metal non-metallic inclusions shall not exceed the maximum score: - sulphides (S) - 3.5 points; - on oxides and silicates (FROM, OS, SP, SH) - 4.0 points.