Mechanical seal products support society's industrial infrastructure, such as power plants and chemical plants, and are used in rotating equipment such as pumps and agitators.
In this field, high corrosion and wear resistance is required.
Mechanical seal rings are products that serve to keep motors and shafts rotating efficiently while preventing the various liquids that filled the inside of the pumps from leaking out. By creating a micron-level gap between the internally rotating shaft and the external pump pipe, it keeps liquid from leaking out and prevents wear on the equipment.
In this field, high corrosion and wear resistance is required.
Mechanical seal rings are products that serve to keep motors and shafts rotating efficiently while preventing the various liquids that filled the inside of the pumps from leaking out. By creating a micron-level gap between the internally rotating shaft and the external pump pipe, it keeps liquid from leaking out and prevents wear on the equipment.
Materials for mechanical seal rings
Materials for mechanical seal rings require hardness and wear resistance. For example, in seawater pumping applications, corrosion resistance is also required. We offer cemented carbides containing Ni and Co (metal phase), as well as durable materials with excellent corrosion resistance in which the metal phase is replaced by a double carbide phase.Various types of materials can be offered to meet your application environment.
Main materials and characteristics of mechanical seal rings
| Material characteristics | JIS B 4054 | NITTAN- Loy grade | Density (g/cm3) | Hardness (HRA) | Fracture toughness (MPa•m1/2) | Transverse rupture strength (GPa) | Compressive strength (GPa) | Poisson's ratio | Young's modulus (GPa) | Coefficient of thermal expansion (x10-6/K) | Thermal conductivity (W/(m*K)) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Medium grain | VM- 30 | G2 | 14.9 | 91.0 | 13.0 | 3.0 | 5.0 | 0.20 | 630 | 5.1 | 115 |
| Medium grain Ni binder | NM- 40 | NR8 | 14.8 | 89.5 | 18.6 | 2.4 | 4.2 | 0.20 | 600 | 5.7 | 85 |
| Medium grain binderless | VM- 10 | RCCL | 14.7 | 93.5 | 5.5 | 1.4 | 3.6 | 0.20 | 640 | 4.8 | 85 |
*Numerical values are representative values and are not guaranteed.
*Fracture toughness is a value measured according to JIS R 1607(IF method).
Corrosion Resisitance of NITTANLOY
*Fracture toughness is a value measured according to JIS R 1607(IF method).
Corrosion Resisitance of NITTANLOY
| Corrosion resistance | HF | HCI | H2SO4 | HNO3 | H2O2 | H3PO4 | C6H8O7 | CH3COOH | (NH4)2SO4 | NaOH | CH3OH | H2O(pure water) | Sea water | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solu- tion | Concentration (%) | 20 | 5 | 10 | 20 | 5 | 10 | 10 | 10 | 10 | 10 | 10 | 5 | 10 | 100 | 100 | 100 |
| Temperature (°C) | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 22 | 50 | 50 | |
| NITTAN- LOY grade | G2 | B | C | C | D | D | B | E | D | B | B | C | B | B | A | A | B |
| NR8 | B | B | B | B | B | B | E | B | B | B | C | B | B | A | A | A | |
| RCCL | A | A | A | B | B | A | D | A | B | A | A | B | B | A | A | A | |
The test pieces were left alone in a solution of atmosphere for a day and then measured for decreases in weight caused by corrosion. The results were ranked as follows in accordance with DIN4851 (German industrial standard): Ranking (decrease in weight by corrosion)
A: Excellent,2.4g/m2/day or less; B: good, 24g/m2/day or less; C: fair, 72g/m2/day or less; D: poor, 240g/m2/day or less; E:absent, 240g/m2/day or less
A: Excellent,2.4g/m2/day or less; B: good, 24g/m2/day or less; C: fair, 72g/m2/day or less; D: poor, 240g/m2/day or less; E:absent, 240g/m2/day or less
