Steel 03KH16N15M3B (026Х16Н15М3Б; ЭИ844Б)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
03Х16Н15М3Б |
| Designation GOST Latin |
03X16H15M3B |
| Transliteration |
03H16N15M3B |
| The chemical elements |
03Cr16Н15Mo3Nb |
| Name |
The value |
| Designation GOST Cyrillic |
026Х16Н15М3Б |
| Designation GOST Latin |
026X16H15M3B |
| Transliteration |
026H16N15M3B |
| The chemical elements |
026Cr16Н15Mo3Nb |
| Name |
The value |
| Designation GOST Cyrillic |
ЭИ844Б |
| Designation GOST Latin |
EI844B |
| Transliteration |
EhI844B |
| The chemical elements |
- |
Description
03KH16N15M3B steel is used: for the manufacture of a tube blank; extremely thin-walled pipes of high precision; profile rolling of high accuracy; welded constructions working in the conditions of action of the boiling phosphoric, sulfuric, 10% acetic acid and sulfuric acid media intended for long-term service at operating temperatures to +600 °C.
Note
High-temperature corrosion-resistant austenitic steel.
Standards
| Name |
Code |
Standards |
| Classification, nomenclature and general norms |
В30 |
GOST 5632-72 |
| Bulls. Blanks. Slabs |
В31 |
OST 3-1686-90, TU 14-1-1641-75 |
| Sectional and shaped rolling |
В32 |
TU 14-11-245-88 |
| Pipes steel and connecting parts to them |
В62 |
TU 14-3-219-89, TU 14-3-550-90 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
N |
V |
Ti |
Mo |
Nb |
W |
Co |
| TU 14-3-219-89 |
≤0.026 |
≤0.015 |
≤0.02 |
≤0.8 |
15-17 |
≤0.6 |
14-16 |
The rest |
- |
≤0.05 |
- |
- |
2.5-3 |
0.25-0.5 |
- |
≤0.02 |
| GOST 5632-72 |
≤0.03 |
≤0.015 |
≤0.02 |
≤0.8 |
15-17 |
≤0.6 |
14-16 |
The rest |
≤0.3 |
- |
≤0.2 |
≤0.2 |
2.5-3 |
0.25-0.5 |
≤0.2 |
- |
| TU 14-1-1641-75 |
0.016-0.026 |
≤0.01 |
≤0.01 |
0.5-0.9 |
16-17 |
≤0.5 |
15-16 |
The rest |
- |
≤0.015 |
0.05-0.25 |
- |
2.5-3 |
0.25-0.45 |
- |
- |
Fe is the basis.
According to TU 14-3-219-89, the chemical composition is specified for steel grade 026H16N15M3B (EI844B).
According to GOST 5632-72, the chemical composition is specified for steel grade 03H16N15M3B (EI844B).
According to TU 14-1-1641-75, the chemical composition is indicated for steel grade 026H16N15MZBU-ID (EI844BU-ID). Deviation according to the chemical composition is allowed: for carbon -0.0040%, for nitrogen + 0. 0050%, for phosphorus +0.0050%. The impurity content should be: cobalt ≤0.005%, copper ≤0.050%, arsenic ≤0.0050%, lead ≤ 0.00050%, cadmium ≤ 0.00050%, tin ≤0.0010%, aluminum ≤0.10%, zinc ≤0.0010%, antimony ≤0.0010%, bismuth ≤ 0.00050%, tantalum ≤0.0050%, titanium ≤0.050%, boron ≤0.0020%. At the same time, deviations in chemical composition are allowed: by the content of tantalum +0.0050%, by the content of cobalt +0.0050%, by the content of titanium +0.050%.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
| Tubular billet on the other 14-1-1641-75. Austenization at 1030-1100 °C (aging for 1 h), cooling in air or in water |
| 20-25 |
- |
≥490 |
≥46 |
| 20-25 |
≥127 |
≥340 |
≥35 |
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 |
Technological properties
| Name |
The value |
| Weldability |
Without restrictions. |
| Macrostructure and contamination |
In the macrostructure of the workpiece on the other 14-1-1641-75 in the state of delivery should be free of cracks, gas bubbles, subcortical bubbles, turns brown, bundles, traces of shrinkage, niobium scabs and slag inclusions visible to the naked eye. Layer-by-layer crystallization and the square of the increased travelmasti are not rejection symptom. Under the control of the workpiece on the transverse microtemplate allowed: Central porosity - less than 1 point, point heterogeneity - not more than 1 score; - square of phase separation is not more than 1 score. In metal non-metallic inclusions shall not exceed the maximum score: - sulfides - 1.0 points; - stroke nitrides and carbonitrides - 2.0 points; - point nitrides and carbonitrides - 2.0 points. The total number of stroke and point nitrides and carbonitrides on each sample must not exceed 3 points. The total number of oxygen inclusions (granules and globules of oxides, spinels, silicates and silicate glasses) shall not exceed: a) from 1 to 2 inclusive divisions of the ocular scale in 2 sections - 50 inclusions on 6 sections - 150 inclusions; b) from 2 to 3 inclusive divisions of the ocular scale in 2 sections - 1 for on, - for 6 sections - 3 inclusions; C) larger than 3 divisions of the ocular scale are not allowed. |
| Corrosion resistance |
03KH16N15M3B steel has higher resistance to pitting than steel 0ЗХ17Н14М3. Tubular billet on the other 14-1-1641-75 must be able to withstand the test of intercrystalline corrosion. Test for intergranular corrosion is performed on 2 samples according to GOST 6032 method AM 24, provoking a vacation at a temperature of 650° - 2 hours. |
