Steel 12H21N5T (ЭИ811; 1Х21Н5Т)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
12Х21Н5Т |
| Designation GOST Latin |
12X21H5T |
| Transliteration |
12H21N5T |
| The chemical elements |
12Cr21Н5Ti |
| Name |
The value |
| Designation GOST Cyrillic |
ЭИ811 |
| Designation GOST Latin |
EI811 |
| Transliteration |
EhI811 |
| The chemical elements |
- |
| Name |
The value |
| Designation GOST Cyrillic |
1Х21Н5Т |
| Designation GOST Latin |
1X21H5T |
| Transliteration |
1H21N5T |
| The chemical elements |
1Cr21Н5Ti |
Description
12H21N5T steel is used: for the manufacture of welded and brazed structures in corrosive environments; solid-rolled rings for different purposes; welding wire.
Note
Austenite corrosion resistant steel-ferritic class.
Steel has higher strength compared with steel 08KH22N6T and the best ability for soldering in comparison with steel 08KH18N10T.
Standards
| Name |
Code |
Standards |
| Pipes steel and connecting parts to them |
В62 |
GOST 11068-81, TU 14-3-1327-85 |
| Tapes |
В34 |
GOST 4986-79, TU 14-1-2298-77, TU 14-1-2299-77 |
| Sheets and stripes |
В33 |
GOST 5582-75, GOST 7350-77, TU 14-1-1150-74, TU 14-1-2476-78, TU 14-1-617-73 |
| Classification, nomenclature and general norms |
В30 |
GOST 5632-72 |
| Sectional and shaped rolling |
В32 |
GOST 5949-75, OST 1 92049-76, TU 14-1-1273-75, TU 14-1-1283-75, TU 14-11-245-88 |
| Bulls. Blanks. Slabs |
В31 |
OST 3-1686-90, OST 1 90232-76 |
| Thermal and thermochemical treatment of metals |
В04 |
STP 26.260.484-2004 |
| Welding and cutting of metals. Soldering, riveting |
В05 |
TU 14-1-1464-75 |
| Metal forming. Forgings |
В03 |
TU 3-1585-89, TU 14-1-1530-75, TU 14-1-2918-80 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
Al |
V |
Ti |
Mo |
W |
| TU 14-1-2476-78 |
0.09-0.14 |
≤0.02 |
≤0.035 |
≤0.8 |
20-22 |
≤0.8 |
5.3-5.8 |
The rest |
- |
≤0.08 |
- |
0.25-0.5 |
- |
- |
| TU 14-1-2918-80 |
0.09-0.14 |
≤0.02 |
≤0.03 |
≤0.8 |
20-22 |
≤0.8 |
4.8-5.8 |
The rest |
≤0.3 |
≤0.08 |
≤0.2 |
0.25-0.5 |
≤0.3 |
≤0.2 |
| TU 14-3-1327-85 |
0.09-0.14 |
≤0.02 |
≤0.025 |
≤0.8 |
20-22 |
≤0.8 |
5.3-5.8 |
The rest |
- |
≤0.08 |
- |
0.25-0.5 |
- |
- |
| GOST 5632-72 |
0.09-0.14 |
≤0.025 |
≤0.035 |
≤0.8 |
20-22 |
≤0.8 |
4.8-5.8 |
The rest |
≤0.3 |
≤0.08 |
≤0.2 |
0.25-0.5 |
≤0.3 |
≤0.2 |
Fe is the basis.
According to TU 14-1-2918-80 the chemical composition is given for steel grade 12Х21Н5Т-ВД. Cerium is introduced into steel by calculation and chemical analysis is not determined.
According to TU 14-3-1327-85, the chemical composition is given for steel grades 12Х21Н5Т (ЭИ811), 12Х21Н5Т-ВД (ЭИ811-ВД). The residual content of elements is allowed in accordance with GOST 5632. At the same time, deviations are allowed: for carbon +0.010%, for nickel -0.20%, for titanium -0.050%. For steel 12Х21Н5Т-ВД (ЭИ811-ВД) the sulfur content should not be more than 0,015%.
According to TU 14-1-2476-78, the chemical composition is given for steel grade chemical composition is given for steel grades 12Х21Н5Т (ЭИ811), 12Х21Н5Т-ВД (ЭИ811-ВД), 12Х21Н5Т-Ш (ЭИ811-Ш). In the finished product, deviations in chemical composition are allowed: for titanium -0,050%, for nickel -0,20%, for carbon +0,010%, for aluminum +0,020%. For the Zaporizhstal plant, nickel content limits of 4.80-5.80% are allowed in steel. In the finished product, deviations in the chemical composition of the remaining elements are allowed in accordance with GOST 5632.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
d4 |
y, % |
kJ/m2, кДж/м2 |
| Ring welded at OST 1 90232-76. Quenching in water or air from 950-1050 °C |
| - |
≥343 |
≥686 |
≥16 |
- |
≥45 |
≥588 |
| - |
≥297 |
≥637 |
≥12 |
- |
≥25 |
≥441 |
| Ring forged in OST 1 92049-76. Quenching in water or air from 950-1050 °C |
| 15 |
≥345 |
≥685 |
≥12 |
- |
≥36 |
≥441 |
| 15 |
≥345 |
≥685 |
≥15 |
- |
≥38 |
≥490 |
| Cold-rolled steel strip of 0.05-2.00 mm according to GOST 4986-79. Quenching in water or air from 950-1050 °C (samples) |
| 0.2-2 |
- |
≥690 |
- |
≥15 |
- |
- |
| 0.2 |
- |
≥690 |
- |
≥8 |
- |
- |
| 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 from 1000-1080 °C |
| - |
≥440 |
≥690 |
≥18 |
- |
- |
- |
| 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 air from 950-1050 °C |
| - |
≥390 |
≥690 |
≥14 |
- |
- |
- |
| Cold-rolled sheet (0.7 to 5.0 mm) and hot-rolled steel (3,0-6,0 mm) made of steel 12H21N5T in the state of delivery on the other 14-1-2476-78. Quenching in water or air from 1000-1080 °C. the elongation specified for the transverse specimens / samples for longitudinal |
|
≥441 |
≥686 |
≥18/20 |
- |
- |
- |
| Bars hot rolled and forged according to GOST 5949-75. Forgings. Quenching in water or air from 950-1050 °C |
|
≥315 |
≥690 |
≥16 |
- |
≥45 |
≥588 |
| Bars hot rolled and forged according to GOST 5949-75. Forgings. Annealing in air 1000-1050 °C + cold Treatment at minus 60-100 °C (endurance 4 hours) + Vacation at 100-200 °C (aging 2-3h), air cooling |
|
≥345 |
≥690 |
≥16 |
- |
≥45 |
≥588 |
| Bars hot rolled and forged at STP 26.260.484-2004. Annealing in air 1020-1050 NN the fire °C |
|
≥350 |
≥700 |
≥20 |
- |
≥40 |
≥588 |
| Tubes seamless cold - and warm in the delivery condition on the other 14-3-1327-85 after termoobrabotki and etching |
| - |
343-588 |
686-932 |
≥17 |
- |
- |
- |
| Tubes seamless cold - and warm on the other 14-3-1327-85 after hot processing. Quenching in water from 950-1000 °C (exposure for 1 h) and cooling with furnace at a rate of 100 °C/h to 300 °C, then air cooling |
|
- |
- |
- |
- |
- |
≥392 |
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 |
| d4 |
Elongation after rupture |
| y |
The relative narrowing |
| kJ/m2 |
Toughness |
Technological properties
| Name |
The value |
| Macrostructure and contamination |
Macrostructure of steel shall be no traces of shrinkage, delamination, foreign inclusions. |
| Features of heat treatment |
Steel products to eliminate the tendency to intergranular corrosion are subjected to hardening regime: heating to 1050±25 °C, exposure during heating for quenching for products with wall thickness up to 10 mm - 30 min, over 10 mm — 20 min + 1 min per 1 mm max thickness cooling in water or air. Products austenite-ferritic steels do not require heat treatment after welding. |
