Creep-resistant, heat-resistant steel 1.4948, X6CrNi18-10, AISI 304H, UNS S30409 according to EN 10088-1.
| Standard | Steel Grade | |||||||
|---|---|---|---|---|---|---|---|---|
| Chemical Composition % | ||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Ni: | N: | |
| EN | 1.4948 - X6CrNi18-10 | |||||||
| 0.04 - 0.08 | <2.0 | <1.0 | <0.035 | <0.015 | 17.0 - 19.0 | 8.0 - 11.0 | <0.1 | |
| ASTM | AISI 304H - TP304H - UNS S30409 | |||||||
| 0.04 - 0.10 | <2.0 | <1.0 | <0.045 | <0.030 | 18.0 - 20.0 | 8.0 - 11.0 | - | |
| ISO | X7CrNi18-9 | |||||||
| 0.04 - 0.10 | <2.0 | <1.0 | <0.045 | <0.030 | 17.5 - 19.5 | 8.0 - 11.0 | <0.1 | |
1.4948, X6CrNi18-10, AISI 304H - specification and application
Acid-resistant stainless steel with austenitic structure classified as heat-resistant and creep-resistant. AISI 304H and 1.4948 are used for temperatures up to 550 ℃. In contrast to the usual 304 and 304L grades, the chemical composition of 304H has been adapted to the working environment in terms of strength properties at high temperatures - resistance to creep, by adding REM. Steel 1.4948 and 304H are resistant to the same acids, alkali, salts and gases as ordinary stainless steel 0H18N9 and 1.4301.
Mechanical properties at room temperature in the +AT condition
- Tensile strength, Rm: 510 - 740 MPa
- The yield point, Rp0,2: >190 MPa
- Elongation, A:> 45%
- Modulus of elasticity, E: 200 GPa
- Impact resistance, KV: > 60J
- Specific resistance, Ω: 0.71 mkOhm * m
- Thermal capacity, cp: 450 J * kg-1 * K-1
- Linear expansion coefficient, α: 16.3 * 10-6 K-1
- Thermal conductivity, λ: 17 W * m-1 * K-1
Properties at elevated temperatures of 1.4948, X6CrNi18-10, AISI 304H
| Temperature (℃) | 50 | 100 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 550 | 600 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tensile strength, Rm (MPa) | >484 | >440 | >410 | >390 | >385 | >375 | >375 | >375 | >370 | >360 | >330 | >300 |
| The yield point Rp0.2 (MPa) | >178 | >157 | >142 | >127 | >117 | >108 | >103 | >98 | >93 | >88 | >83 | >78 |
Heat and plastic treatment
- Supersaturation at 1050 - 1100 ℃ with quick cooling in water or air
- Rolling and forging at a temperature of 1150 - 850 ℃
In the above mentioned grades the company provides:
- Heat-resistant and creep-resistant sheets 1.4948, X6CrNi18-10, AISI 304H, UNS S30409
- Heat-resistant and creep-resistant tubes 1.4948, X6CrNi18-10, AISI 304H, UNS S30409
Other grades designations:
TP304H, TP 304 H, CR304H, WP304H, DMV 304H, SUS 304H, UNS S30409, X 6 CrNi 18-10, 4948.