High-carbon martensitic stainless steel X90CrMoV18, 1.4112, X105CrMo17, 1.4125, X70CrMo15, 1.4109, AISI 440A, AISI 440B, AISI 440C, for knives and rolling bearings acc. to EN 10088-1, ISO 683-17.
| Standard | Steel Grade | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition % | |||||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Ni: | Mo: | V: | Cu: | Co: | |
| PN | H18 | ||||||||||
| 0.90 - 1.05 | <0.8 | <0.8 | <0.04 | <0.03 | 17.0 - 19.0 | <0.6 | - | - | - | - | |
| EN | 1.4125 - X105CrMo17 - X 105 CrMo 17 | ||||||||||
| 0.95 - 1.20 | <1.0 | <1.0 | <0.04 | <0.03 | 16.0 - 18.0 | - | 0.4 - 0.8 | - | - | - | |
| EN | 1.4112 - X90CrMoV18 - X 90 CrMoV 18 | ||||||||||
| 0.85 - 0.95 | <1.0 | <1.0 | <0.04 | <0.03 | 17.0 - 19.0 | - | 0.9 - 1.3 | 0.07 - 0.12 | - | - | |
| ISO | 1.3543 - X108CrMo17 - X 108 CrMo 17 | ||||||||||
| 0.95 - 1.20 | <1.0 | <1.0 | <0.04 | <0.03 | 16.0 - 18.0 | - | 0.4 - 0.8 | - | - | - | |
| DIN | 1.4528 - X105CrCoMo18-2 - X 105 CrCoMo 18-2 | ||||||||||
| 1.00 - 1.10 | <1.0 | <1.0 | <0.045 | <0.03 | 16.5 - 18.5 | - | 1.0 - 1.5 | 0.07 - 0.12 | - | 1.3 - 1.8 | |
| GOST | 95Ch18 - 95Kh18 - 95Х18 | ||||||||||
| 0.9 - 1.0 | <0.8 | <0.8 | <0.03 | <0.025 | 17.0 - 19.0 | <0.6 | <0.2 | <0.2 | - | - | |
| EN | 1.4109 - X70CrMo15 | ||||||||||
| 0.60 - 0.75 | <1.0 | <0.7 | <0.04 | <0.03 | 14.0 - 16.0 | - | 0.4 - 0.8 | - | - | - | |
| ASTM | UNS S44002 - AISI 440A | ||||||||||
| 0.60 - 0.75 | <1.0 | <1.0 | <0.04 | <0.03 | 16.0 - 18.0 | - | <0.75 | ||||
| ASTM | UNS S44003 - AISI 440B | ||||||||||
| 0.75 - 0.95 | <1.0 | <1.0 | <0.04 | <0.03 | 16.0 - 18.0 | - | <0.75 | - | - | - | |
| ASTM | UNS S44004 - AISI 440C | ||||||||||
| 0.95 - 1.20 | <1.0 | <1.0 | <0.04 | <0.03 | 16.0 - 18.0 | - | <0.75 | - | - | - | |
| ASTM | UNS S44020 - AISI 440F | ||||||||||
| 0.95 - 1.20 | <1.25 | <1.0 | <0.06 | <0.15 | 16.0 - 18.0 | <0.5 | - | - | <0.6 | - | |
H18, X105CrMo17 / 1.4125, X90CrMoV18 / 1.4112, AISI 440C / UNS S44004 - specification and application:
H18 grade is high-chromium and at the same time high-carbon stainless steel with a martensitic structure, made of which ready components are subjected to hardening and tempering. It is characterized by high hardness >55 HRC, while maintaining good resistance to corrosive environments and resistance to operating temperatures <400 ℃
Together with high hardness, the material is highly resistant to abrasion and wear, so the grade can be classified as a corrosion resistant bearing or tool steel. In addition, it is a much better grade than 4H13 steel. The blades made of H18 steel are more durable, harder, slower to wear and dull, and additionally have a much better corrosion resistance.
Found mainly in the food or chemical industry - it is used for the production of special construction parts, valves, bearings, parts of fittings subject to abrasion, tools, guide rollers, bushings, rings, kitchen knives, ball bearings, hunting knives and knives used in food processing , which additionally require basic resistance to simple corrosive environments. Steel can be a good alternative to the grades ŁH15, 100Cr6, 1.3505, where a considerable Chromium addition is required in applications.
It should be borne in mind that the addition of chromium at the level of 17-18% is necessary to maintain the corrosion resistance of steel with such a high carbon range, which is associated with limited applications in slightly more aggressive environments. Depending on the counterpart - grades acc. to ISO/EN may contain addition of Molybdenum or Vanadium, which may slightly affect some of the unique applications and properties of materials - Molybdenum increases resistance to oxidation at higher temperatures, and Vanadium is responsible for increasing the hardness of the product (especially X90CrMoV18 in which there is much less carbon)
In order to increase the resistance to corrosion, the essence is to keep the surface of the detail as smooth as possible without burrs and roughness. The steel has no resistance to orthophosphoric acid, sulfuric acid, salt solutions, most chlorides, chlorine, exhaust gases and hydrogen chloride. The products can be used in a "light" corrosive environment.
The two most popular grades - X105CrMo17 / 1.4125 and X90CrMoV18 / 1.4112 are significantly different from each other in terms of carbon content, addition of vanadium or molybdenum, but often they can be used interchangeably.
Mechanical and physical properties of steel X90CrMoV18 / 1.4112 and X105CrMo17 / 1.4112 according to EN 10088-1, EN 10088-3:
- Thermal conductivity, λ20℃: 15 W * m-1 * K-1
- Linear expansion coefficient, α = 10,4 * 10-6 * K-1
- Heat capacity, cp = 430 J * kg-1 * K-1
- Resistance: 0,8 mkOhm * m
- Modulus of elasticity, E = 215 GPa
- Density = 7,7 g/cm3
- Hardness in annealed condition +1C, +1E, +1D, +1X, +1G, +2D: < 285HB
- Hardness after hardening and tempering of steel 1.4112 / X90CrMoV18: 55-57 HRC
- Hardness after hardening and tempering steel 1.4125 / X105CrMo17: 57-60 HRC
Mechanical properties of UNS S44004 / AISI 440C and UNS S44003 / AISI 440B:
- for X90CrMoV18, 1.4112
- softening annealing at a temperature of 780 - 840℃ with cooling in air or furnace
- Hardening at 1000 - 1080 ℃ with cooling in water or oil
- Tempering at a tempering of 100 - 200℃
- for X105CrMo17, 1.4125
- softening annealing at a temperature of 780 - 840℃ with cooling in air or furnace
- Hardening at 1000 - 1050℃ with cooling in oil
- Tempering at a tempering of 100 - 300℃
- for H18 steel
- softening annealing at a temperature of 850 - 900℃ with cooling in furnace
- Hardening at 1000 - 1050℃ with cooling in oil
- Tempering at a tempering of 200 - 300℃
Heat treatment processes:
- for X90CrMoV18, 1.4112
- softening annealing at a temperature of 780 - 840℃ with cooling in air or furnace
- Hardening at 1000 - 1080 ℃ with cooling in water or oil
- Tempering at a tempering of 100 - 200℃
- for X105CrMo17, 1.4125
- softening annealing at a temperature of 780 - 840℃ with cooling in air or furnace
- Hardening at 1000 - 1050℃ with cooling in oil
- Tempering at a tempering of 100 - 300℃
- for H18 steel
- softening annealing at a temperature of 850 - 900℃ with cooling in furnace
- Hardening at 1000 - 1050℃ with cooling in oil
- Tempering at a tempering of 200 - 300℃
In the above mentioned grades the company provides:
- Peeled bars, drawn bars and bars forged with swaging machine
- Stainless steel sheets
- Forging and rings
- Drawn wires
Other replacements and equivalents of the grade:
SUS 440C, SUS 440B, CSN 17042, 9Ch18, X10CrMo17, 90Cr180, X105CrMo17, 1.4125, X90CrMoV18, 1.4112, X 105 CrMo 17, X 90 CrMoV 18, 1.4528, X105CrCoMo18-2, 1.4109, X70CrMo15, AISI 440A, AISI 440C, AISI 440B, AISI 440F, 9Cr18MoV, 11Cr17, 110CrMo17, X36CrMo17, X91CrMoV18, 90VMoCr180, UNS S44003, UNS S44004, UNS S44020, UNS S44025, 14-4CrMo, 1.3543, X108CrMo17, 110Х18М, 95Х18, 110Ch18M, 95Ch18, Z100CD17CI, Z 100 CD 17 CI