High tension material
The high tension material supports the aircraft that the advanced technology concentrated.
Nippon Koshuha’s high tension material and constant elasticity material are indispensable in a wide field such as the motor, tools, and aircraft parts. The high tension material that appears from excellent manufacturing technology is represented by the following two. Precipitation hardening stainless steel possesses good corrosion resistance, heat resistance, and high strength, and can be used as spring, bolt, and aircraft component. Maraging steel possesses good weldability in addition to high toughness and strength, and can be used as spring, tool, and parts for high speed rotor. Constant elasticity material has the characteristic into which elasticity modulus does not change by a surrounding temperature change, and can be used as parts for spring scale, clock, precision instrument.
Springs manufactured from
special alloy wire
Bolts and cold forging products
manufactured from Maraging steel
and nickel span C
| High tension material | |||||
| Class | Grade | Equivalent alloy | Principal chemical composition | characteristic | Example of usage |
| Precipitation hardening stainless steel | KTA17-7 | 17-7PH | 17Cr-7Ni-1Al-Fe | Corrosion
resistance equal with the stainless steel High strength |
Spring, Ring, Washer, Aircraft components |
| KTA17-4 | 17-4PH | 17Cr-4Ni-3Cu-Nb-Fe | |||
| KTA15-5 | 15-5PH | 15Cr-5Ni-3Cu-Nb-Fe | |||
| KTA13-8 | PH13-8MO | 13Cr-8Ni-2Mo-Fe | Spring, aircraft components | ||
| Maraging steel | KMS18-14 | – | 18Ni-4Mo-8Co-Ti-Al-Fe | High
strength and high toughness Good heat resistance up to 400℃ Good cold workability Good weldability |
High strength spring, High speed rotor, Tool. |
| KMS18-17 | – | 18Ni-4.5Mo-8Co-Ti-Al-Fe | |||
| KMS18-20 | – | 18Ni-5Mo-8.5Co-Ti-Al-Fe | |||
| KMS18-22 | – | 18Ni-4Mo-12Co-Ti-Al-Fe | |||
| KMS18-24 | – | 18Ni-4Mo-12.5Co-Ti-Al-Fe | |||
| Constant elasticity material | |||||||||
| Class | Grade | Equivalent alloy | Principal chemical composition | modulus of longitudinal elasticity G(N/mm2) |
modulus of transverse elasticity E(N/mm2) |
Mechanical property | Example of usage | ||
| Tensile strength(N/mm2) | Elongation (％) | Hardness | |||||||
| Wataru elastic material | KTA-EL | ELINVAR | 36Ni-12Cr-1.5Mn-1.5Si-2W-Fe | 78,400～ 83,300 |
– | 740 | 30 | HV230 | Spring |
| KTA-NSC | Ni-SPAN-C | 42Ni-5.5Cr-2Ti-Al-Fe | 176,400～ 196,000 |
68,600～ 73,500 |
590～1,370 | – | HRC42 | ||
The trademark quoted on this page and the proprietary rights are as shown in the following
| Trade mark | Name of the company | Trade mark | Name of the company |
| DISCALOY | Westinghouse Electric | KOVAR | Carpenter technology |
| ELINVAR | Imphy Alloys | MONEL | INCO Alloys |
| HASTELLOY | Haynes International | NIMONIC | INCO Alloys |
| INCONEL | INCO Alloys | NISPANC | INCO Alloys |
| INCOLOY | INCO Alloys | WASPALOY | United Technologies. |
| INVAR | Imphy Alloys |