DOMADIA™ Tokkin 350
DOMADIA™ Tokkin 350
DOMADIA™ Tokkin 350 – High-Strength, Corrosion-Resistant Cr-Ni-Mo Stainless Steel
DOMADIA™ Tokkin 350 is a premium chromium-nickel-molybdenum stainless steel developed for applications demanding exceptional strength, durability, and corrosion resistance. Supplied in solution heat-treated and annealed conditions, this alloy exhibits excellent workability and achieves high strength through a specialized heat treatment process. Not made in India.
Unlike conventional precipitation-hardening stainless steels, DOMADIA™ Tokkin 350 contains no Aluminum or No Titanium, ensuring superior weldability without compromising performance. AKA Aluminium Free Steel. Its high yield strength, fatigue resistance, and cyclic stress tolerance make it ideal for precision-engineered components requiring long operational life!
Key Advantages
- Heat-Treatable High Strength
Achieves maximum strength through dual-stage hardening: martensitic transformation followed by precipitation hardening. - Enhanced Corrosion and Oxidation Resistance
Molybdenum addition provides elevated resistance in harsh environments. - Excellent Weldability
Free from Al and Ti, ensuring clean welds with minimal cracking or brittleness. - Fatigue-Resistant Design
Superior cyclic fatigue strength makes it ideal for mechanically dynamic applications.
Mechanical Properties of DOMADIA™ Tokkin 350
As Annealed / As Rolled (2B Finish)
All values are maximums for strength and minimums for elongation.
| Thickness (mm) | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HV) |
| 0.039 – 0.051 | ≤ 1393 | ≤ 641 | ≥ 9 | Negotiable* |
| 0.052 – 0.127 | ≤ 1372 | ≤ 627 | ≥ 10 | Negotiable* |
| 0.128 – 0.254 | ≤ 1351 | ≤ 614 | ≥ 12 | Negotiable* |
| 0.255 – 0.508 | ≤ 1331 | ≤ 600 | ≥ 14 | Negotiable* |
🔹 After Age Hardening (SCT850 Treatment)
Values are minimums for strength and elongation.
| Thickness (mm) | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HV) |
| 0.039 – 0.508 | ≥ 1276 | ≥ 1034 | 4 – 8 | Negotiable* |
Physical Properties of DOMADIA™ Tokkin 350
Condition: Solution Heat-Treated and Annealed
| Property | Value | Unit / Range |
| Density | 7.92 | g/cm³ |
| Specific Heat | 461 | J/(kg·K) |
| Electrical Resistivity | 79 | μΩ·cm |
| Thermal Expansion | 15.2 × 10⁻⁶ | /K (in the range 25–100°C) |
| Thermal Conductivity | 15.4 | W/(m·K) at 100°C |
Chemical Composition of DOMADIA™ Tokkin 350
All values in mass %
| Element | Content (mass%) |
| C (Carbon) | 0.07 – 0.11 |
| Si (Silicon) | ≤ 0.50 |
| Mn (Manganese) | 0.50 – 1.25 |
| P (Phosphorus) | ≤ 0.040 |
| S (Sulfur) | ≤ 0.030 |
| Cr (Chromium) | 16.00 – 17.00 |
| Ni (Nickel) | 4.00 – 5.00 |
| Mo (Molybdenum) | 2.50 – 3.25 |
| Fe (Iron) | Balance |
| Others (Nitrogen) | 0.07 – 0.13 (N) |
Standards and Designations for DOMADIA™ Tokkin 350
| Standard Body | Designation | Description |
| UNS | S35000 | Unified Numbering System alloy designation |
| ASTM | A693 (Type 633) | Specification for precipitation-hardening stainless steel plate, sheet, and strip |
| AMS | 5548 | Aerospace specification for corrosion-resistant steel, sheet, strip, and plate, annealed |
| AISI | 633 | American Iron and Steel Institute equivalent |
Applications of DOMADIA™ Tokkin 350
1. Bellows
Used in systems that require repeated flexing, such as vacuum seals or expansion joints. Tokkin 350’s excellent cyclic fatigue strength ensures long life and reliability, even in corrosive or high-temperature environments.
2. Diaphragms
Ideal for pressureregulation and sensorcomponents, where precision and durability are critical. The alloy’s elasticity and structural integrity under stress offer consistentmechanicalresponse over millions of cycles.
3. Valves & Actuated Valves
Perfect for fluidcontrolsystems that demand strength, corrosion resistance, and precision. Suitable for both static components and dynamicactuators, especially in HVAC, industrial automation, and aerospace.
4. Air Conditioning Components
Resists humidity, saltspray, and cyclic thermal load—essential for parts like springclips, valveplates, andcontrollevers that must maintain performance in fluctuating conditions.
5. Watch Parts
Provides non-magnetic, corrosion-resistant, and durableperformance in high-precision miniature mechanisms. Suitable for springs,gears,andregulators in mechanical and smart timepieces.
🛡️ Corrosion Resistance of DOMADIA™ Tokkin 350
DOMADIA™ Tokkin 350 exhibits a range of corrosion resistance levels depending on the chemical environment. Its molybdenum-enriched composition enhances performance, especially in oxidizing and chloride-containing media.
| Environment | Resistance Rating | Classification |
| Humidity | S | Excellent |
| Sea Water | R | Restricted (Not Recommended) |
| Salt Spray (NaCl) | A | Good |
| Sodium Hydroxide | B | Moderate |
| Hydrochloric Acid | R | Restricted |
| Acetic Acid | B | Moderate |
| Phosphoric Acid | R | Restricted |
| Sulphuric Acid | R | Restricted |
| Nitric Acid | A | Good |
Get the Right Fit
Not sure which material suits your application?
We help you match your performance requirements with the best fiber option from our high-tech portfolio.
Get in touch with us Today!
📩 Email: sales@domadia.com
Call/WhatsApp: +91-9594066275
Error: Contact form not found.
