Steel 03KH21N21M4GB (ЗИ35)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
03Х21Н21М4ГБ |
| Designation GOST Latin |
03X21H21M4GB |
| Transliteration |
03H21N21M4GB |
| The chemical elements |
03Cr21Н21Mo4MnNb |
| Name |
The value |
| Designation GOST Cyrillic |
ЗИ35 |
| Designation GOST Latin |
ZI35 |
| Transliteration |
ZI35 |
| The chemical elements |
ЗИ35 |
Description
03KH21N21M4GB steel is used: for the manufacture of welded structures and components operating in conditions of hot phosphoric acid with a mixture of fluorine and sulfur compounds, and sulfuric acid of low concentration at temperatures up to +80 °C, nitric acid at temperatures up to +95 °C; parts of equipment for chemical industry (production of phosphoric acid, fertilizers, cellulose acetate, vinyl acetate, etc.); equipment, working in conditions of intensive wear (mixers, separators, extractors); welding electrodes used in the manufacture of equipment for energy and chemical engineering.
Note
Steel is a complex alloy corrosion-resistant austenitic class.
Standards
| Name |
Code |
Standards |
| Metal forming. Forgings |
В03 |
GOST 25054-81 |
| Sheets and stripes |
В33 |
GOST 5582-75, GOST 7350-77, TU 14-1-4364-87 |
| Classification, nomenclature and general norms |
В30 |
GOST 5632-72 |
| Bulls. Blanks. Slabs |
В31 |
OST 3-1686-90, TU 14-1-2134-77 |
| Thermal and thermochemical treatment of metals |
В04 |
STP 26.260.484-2004 |
| Sectional and shaped rolling |
В32 |
TU 14-1-1190-75, TU 14-11-245-88, TU 14-1-4319-87 |
| Pipes steel and connecting parts to them |
В62 |
TU 14-3-694-78, TU 14-3-696-78, TU 14-3-751-78 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
W |
| GOST 5632-72 |
0.03 |
≤0.02 |
≤0.03 |
1.8-2.5 |
20-22 |
≤0.6 |
20-22 |
The rest |
≤0.3 |
≤0.2 |
≤0.2 |
3.4-3.7 |
≤0.2 |
Fe is the basis.
According to GOST 5632-72 the content of Nb% = 15C% is 0.8%.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
d10 |
y, % |
| Hot rolled sheet (of 1.5-3.9 mm) and cold rolled (0,7-3,9 mm) steel according to GOST 5582-75. Quenching in water or air with 1080-1130 °C |
| - |
≥245 |
≥540 |
- |
≥25 |
- |
| Hot rolled sheet (4,0-25,0 mm) and cold rolled (4,0-5,0 mm) steel according to GOST 7350-77. Quenching in water or under a water shower with 1060-1120 °C |
| - |
≥295 |
≥590 |
≥30 |
- |
- |
| Bars hot rolled and forged at STP 26.260.484-2004. Quenching in water or under a water shower with 1060-1120 °C |
|
≥300 |
≥600 |
≥30 |
- |
≥30 |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
| d10 |
Elongation after rupture |
| y |
The relative narrowing |
Technological properties
| Name |
The value |
| Weldability |
Without ogranicheniy |
| Features of heat treatment |
Steel products 03KH21N21M4GB should be hardened with 1060-1120 °C, holding time wall thickness up to 15mm - 30 min, more than 15 mm - 30 min + 1 min per 1 mm of maximum wall thickness; the product is cooled in water or air. |
