Steel 03Н18К9М5ТЮ (its predecessor, the čs4)

Designation

Name The value
Designation GOST Cyrillic 03Н18К9М5ТЮ
Designation GOST Latin 03H18K9M5TJu
Transliteration 03N18K9M5TYu
By chemical elements 03Н18Co9Mo5TiAl
Name The value
Designation GOST Cyrillic ЧС4
Designation GOST Latin ChC4
Transliteration ChS4
By chemical elements ZrС4

Description

03Н18К9М5ТЮ steel is used: for the production of bodies of rocket motors, artillery guns and small guns, hulls of submarines, submersibles, high-load disc turbines, gear wheels, spindles, worms, etc.

Note

Maraging steel with higher structural stability in the temperature range from cryogenic to +500 °C.

Standards

Name Code Standards
Blanks. Of the workpiece. Slabs В31 TU 14-1-1214-75, TU 14-1-4203-86
Sheets and strips В33 TU 14-1-1771-75, TU 14-1-4805-90
Bars and shapes В32 TU 14-1-811-73

Chemical composition

Standard C S P Mn Si Ni Fe Al B Ti Mo Zr Co
TU 14-1-4805-90 ≤0.03 ≤0.01 ≤0.01 ≤0.1 ≤0.1 17.5-19 Rest 0.05-0.15 ≤0.003 0.65-0.9 4.8-5.2 ≤0.02 8-9
Fe is the basis.
According to TU 14-1-4805-90 the chemical composition is given for steel grades 03N18K9M5TYU-VI (ChS4-VI), 03N18K9M5TYU-ID (CS4-ID). Boron and zirconium are introduced by calculation and chemical analysis are not determined.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2
Steel cold-rolled sheet 3.5 mm on the other 14-1-4805-90. Without heat treatment - as supplied
3.5 - ≥1320 ≥6 - -
Steel cold-rolled sheet 3.5 mm on the other 14-1-4805-90. Annealing in air 810-830 °C (aging of 0.5-1.0 h), air cooling + Ageing at 480-500 °C (extract 3 hours), air cooling
3.5 ≥1815 ≥1910 ≥5 - -
Bars hot rolled and forged on the other 14-1-811-73. Hardening in air, 810-830 °C (aging 1 HR) + Aging at 470-490 °C (extract 3 hours), air cooling
≥1815 ≥1910 ≥7 ≥40 ≥340

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
y The relative narrowing
KCU Toughness