Steel 12H21N5T (ЭИ811; 1Х21Н5Т)
Designation
| Name | The value |
|---|---|
| Designation GOST Cyrillic | 12Х21Н5Т |
| Designation GOST Latin | 12X21H5T |
| Transliteration | 12H21N5T |
| By chemical elements | 12Cr21Н5Ti |
| Name | The value |
|---|---|
| Designation GOST Cyrillic | ЭИ811 |
| Designation GOST Latin | EI811 |
| Transliteration | EhI811 |
| By chemical elements | - |
| Name | The value |
|---|---|
| Designation GOST Cyrillic | 1Х21Н5Т |
| Designation GOST Latin | 1X21H5T |
| Transliteration | 1H21N5T |
| By 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 |
|---|---|---|
| Steel pipes and fittings to them | В62 | GOST 11068-81, TU 14-3-1327-85 |
| Tape | В34 | GOST 4986-79, TU 14-1-2298-77, TU 14-1-2299-77 |
| Sheets and strips | 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 rules | В30 | GOST 5632-72 |
| Bars and shapes | В32 | GOST 5949-75, OST 1 92049-76, TU 14-1-1273-75, TU 14-1-1283-75, TU 14-11-245-88 |
| Blanks. Of the workpiece. 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 metals. Soldering, riveting | В05 | TU 14-1-1464-75 |
| Processing of metals by pressure. 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 | 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 | 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 | 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 | 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.
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 properties
| Section, mm | sT|s0,2, MPa | σU, MPa | d5, % | d4 | y, % | KCU, kJ/m2 |
|---|---|---|---|---|---|---|
| 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 |
|---|---|
| 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 |
| d4 | Elongation after rupture |
| y | The relative narrowing |
| KCU | Toughness |
Technological properties
| Name | The value |
|---|---|
| Macrostructure and pollution | 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. |
