Acid-resistant stainless steel X8CrNi25-21, X12CrNi25-21, 1.4845, AISI 310S for heavy duty parts working in corrosive environment and temperature up to 1050 ℃ according to EN 10095, SEW 470.
| Standard | Steel Grade | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition % | |||||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Ni: | Mo: | V: | W: | N: | |
| PN | H23N18 | ||||||||||
| <0.2 | <1.5 | <1.0 | <0.045 | <0.030 | 22.0 - 25.0 | 17.0 - 20.0 | <0.5 | <0.2 | <0.5 | - | |
| EN | X8CrNi25-21 - X 8 CrNi 25-21 - 1.4845 | ||||||||||
| <0.1 | <2.0 | <1.5 | <0.045 | <0.015 | 24.0 - 26.0 | 19.0 - 22.0 | - | - | - | <0.11 | |
| SEW | X12CrNi25-21 - X 12 CrNi 25-21 - 1.4845 - 4845 | ||||||||||
| <0.1 | <2.0 | <1.5 | <0.045 | <0.015 | 24.0 - 26.0 | 19.0 - 22.0 | - | - | - | <0.11 | |
| DIN | X16CrNi25-20 - X 16 CrNi 25-20 - 1.4843 | ||||||||||
| <0.2 | <2.0 | 1.5 - 2.5 | <0.045 | <0.030 | 22.0 - 25.0 | 19.0 - 22.0 | - | - | - | - | |
| GOST | 20Ch23N18 - 20Kh23N18 - 20Х23Н18 | ||||||||||
| <0.2 | <2.0 | <1.0 | <0.035 | <0.020 | 22.0 - 25.0 | 17.0 - 20.0 | <0.3 | <0.2 | <0.2 | - | |
| GOST | 10Ch23N18 - 10Kh23N18 - 10Х23Н18 | ||||||||||
| <1.0 | <2.0 | <1.0 | <0.035 | <0.020 | 22.0 - 25.0 | 17.0 - 20.0 | <0.3 | <0.2 | <0.2 | - | |
| AFNOR | AF Z12CN25-20 - Z 12 CN 25-20 | ||||||||||
| <0.15 | <2.0 | <1.0 | <0.040 | <0.030 | 23.0 - 26.0 | 18.0 - 21.0 | - | - | - | - | |
| ASTM | AISI 310S - AISI 310 S - UNS S31008 | ||||||||||
| <0.08 | <2.0 | <1.5 | <0.045 | <0.030 | 24.0 - 26.0 | 19.0 - 22.0 | - | - | - | - | |
| BS | 310S24 - 310 S 24 | ||||||||||
| <0.15 | <2.0 | <1.0 | <0.045 | <0.030 | 23.0 - 26.0 | 19.0 - 22.0 | - | - | - | - | |
X8CrNi25-21, 1.4845, AISI 310S - specification and application
Creep-resistant and heat-resistant H23N18 steel is a chromium-nickel austenitic grade with an increased nickel content compared to H23N13, showing high strength, ductility, resistance in air and oxidizing atmosphere to high temperatures up to 1050 ℃. The steel is used for mechanically loaded parts that work at high temperatures.
For H23N18 not every work environment is right. Steel in contact with reducing gases, and containing sulfur compounds in higher concentrations, endures temperatures up to 900 ℃. With small impurities it can work up to 1000 ℃. It is used for parts of the furnace, installations, hooks, stands, trolleys, responsible screws, furnace casings, etc.
Classification of the grade as heat-resistant does not limit the use of forged and rolled products only to work at high temperatures. Many users purchase H23N18, heat-resistant materials, because they are ideal as acid-resistant steel. It is used for parts of furnaces, crucibles, parts of chemical apparatus for gas pyrolysis, hydrogenation or methane convergence. Heat resistance and acid resistance in many cases are used when the components work together.
Products made of H23N18 are usually arc welded using ES-24-18 electrodes. Bending of hot elements from sheets should be carried out at a temperature of 900 - 950 ℃.
Mechanical properties of X8CrNi25-21, X12CrNi25-21, 1.4845, AISI 310S
- Tensile strength, Rm: 500 - 700 MPa
- The yield point, Re: > 210 MPa
- Elongation, A: >33%
- Modulus of elasticity, E = 196 GPa
- Thermal capacity, cp20-100: 500 J/kg * K
- Linear expansion coefficient, 15,0 * 10-6 * K-1
- Thermal conductivity: 14,7 W/m * K
- Hardness: < 192 HB
Creep limit and creep resistance of 1.4845, X8CrNi25-21 steel:
| Properties (MPa) | Temperature | ||||||
|---|---|---|---|---|---|---|---|
| 600℃ | 700℃ | 800℃ | 900℃ | ||||
| Creep limit | R1/1000 | 100 | 45 | 18 | 10 | ||
| R1/10000 | 90 | 30 | 10 | 4 | |||
| Creep strength | Rz/1000 | 170 | 80 | 35 | 15 | ||
| Rz/10000 | 130 | 40 | 18 | 8.5 | |||
| Rz/100000 | 80 | 18 | 7 | 3 | |||
Heat treatment processes:
- Supersaturation at 1100 - 1150 ℃ in water
- Rolling and forging at a temperature of 1150 - 950 ℃
In the H23N18 grade and equivalents, the company provides:
- drawn bars and peeled bars 1.4845, X12CrNi25-21, AISI 310S
- Seamless and welded tubes 1.4845, TP310S
- Hot-rolled sheets 1.4845, X12CrNi25-21, AISI 310S
- Cutted elements, rings and flat bar 1.4845, AISI 310S
- Forgings and forged bars 1.4845, AISI 310S
- drawn wires 1.4845, AISI 310S
- strips in coils 1.4845, AISI 310S
Other replacements and equivalents of the grade:
H23N18, 1.4845, 4845, AISI 310S, AISI 310 S, X6CrNi25-20, 1.4951, 06Cr25Ni20, 0Cr25Ni20, X8CrNi25-21, X12CrNi25-21, CSN 17255, STN 17255, Z12CN25-20, Z 12 CN 25-20, Z12CN26-21, Z 12 CN 26-21, Z8CN25-20, Z 8 CN 25-20, X 12 CrNi 25-21, X12CrNi25-20, X 12 CrNi 25-20, BS 310S24, 310S25, BS 310 S 24, X22CrNi25-20, SUS 310S, 12NiCr250, F-331, 1RE12 WT, 7RE10 AE, 8RE10 R, UNS S31008, UNS S31009, TP310S, AMS 5521, AMS 5572, AMS 5577, AMS 5651, AMS 7490, AISI 310H, TP310H, 20Ch23N18, 20Kh23N18, 20Х23Н18, 10Ch23N18, 10Kh23N18, 10Х23Н18.