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Premium Custom Martensitic Stainless Steel for Precision Engineering
1.What is TRIMRITE® (UNS S42010)?
TRIMRITE® is a hardenable martensitic stainless steel containing approximately 13.5–15.0% chromium, along with controlled additions of molybdenum and nickel. The alloy is designed to achieve a fully martensitic structure after heat treatment, providing high strength and hardness while maintaining good ductility and toughness. It is magnetic in all conditions and can be processed using equipment and techniques commonly employed for 410 stainless steel.
2.Key Properties:
• Superior corrosion resistance vs. other stainless steels
• High hardness and strength
• Excellent ductility and toughness
• Good formability and machinability
3.Applications:
• Fasteners
• Valves, gauges, and chains
• Medical and dental tools
• Drills and shafts
• Food processing
• Instruments
4.Forms manufactured:
Bar-Rounds, Billet, Strip, Wire, Wire-Rod
5.Applicable Specifications:
ASTM A276、ASTM A493、ASTM F899
6.Chemical Composition :
| Element | Content | Element | Content | Element | Content |
| Iron | Balance | Chromium | 13.50–15.00% | Manganese | Max 1.00% |
| Silicon | Max 1.00% | Molybdenum | 0.40–1.00% | Nickel | 0.25–1.00% |
| Carbon | 0.15–0.30% | Phosphorus | Max 0.040% | Sulfur | Max 0.030% |
7.Physical Properties
| Property | Value | Unit |
| Specific Gravity / Density | 7.75 / 0.2800 | g/cm³ / lb/in³ |
| Mean Specific Heat (32–212°F) | 0.1100 | Btu/lb/°F |
| Mean CTE (32–212°F) | 5.61×10⁻⁶ | in/in/°F |
| Modulus of Elasticity (E) | 29.0×10³ | ksi |
| Electrical Resistivity (70°F) | 335.0 | ohm-cir-mil/ft |
8. Typical Mechanical Properties
8.1 Annealed Condition (Wire / Bar / Strip)
| Product Form | 0.2% Yield Strength | Ultimate Tensile Strength | Elongation % | Reduction of Area % | Hardness HRB | ||
| ksi | MPa | ksi | MPa | ||||
| Wire | 57 | 393 | 94 | 648 | 35 | 68 | 92 |
| Bar | 54 | 372 | 88 | 607 | 28 | 66 | 88 |
| Strip | 50 | 345 | 88 | 607 | 26 | – | 88 |
8.2 Hardened And Tempered
| TYPICAL ROOM TEMPERATURE MECHANICAL PROPERTIES — BAR | ||||||||||
| Tempering Temperature | 0.2% Yield Strength | Ultimate Tensile Strength | Elongation in 4D% | Reduction of Area% | Charpy V-Notch Impact | Hardness HRC | ||||
| °F | °C | ksi | MPa | ksi | MPa | ft-lbs | J | HRC | ||
| 400 | 204 | 185 | 1276 | 250 | 1724 | 14 | 45 | 14 | 19 | 50 |
| 500 | 260 | 172 | 1186 | 235 | 1620 | 15 | 50 | 16 | 22 | 47 |
| 600 | 316 | 172 | 1186 | 235 | 1620 | 15 | 50 | 13 | 18 | 47 |
| 700** | 371 | 178 | 1227 | 237 | 1634 | 14 | 50 | 10 | 14 | 48 |
| 850** | 454 | 190 | 1310 | 240 | 1655 | 14 | 48 | 5 | 7 | 48 |
| 950** | 510 | 176 | 1213 | 248 | 1710 | 15 | 50 | 7 | 9 | 49 |
| TYPICAL ROOM TEMPERATURE MECHANICAL PROPERTIES — 410 AND 420 BAR | |||||||
| Alloy & Condition | 0.2% Yield Strength | Ultimate Tensile Strength | Elongation in 4D % | Reduction of Area % | Hardness | ||
| ksi | MPa | ksi | MPa | ||||
| 410, Annealed | 50 | 345 | 85 | 586 | 35 | 75 | 83 HRB |
| 410, Hardened | 150 | 1035 | 190 | 1310 | 15 | 55 | 42 HRC |
| 420, Annealed | 55 | 380 | 95 | 656 | 25 | 55 | 94 HRB |
| 420, Hardened | 215 | 1482 | 250 | 1724 | 8 | 25 | 52 HRC |
9.Heat treatment
Annealing：Heat uniformly to 1350/1400°F (732/760°C), hold 2–4h then air cool to ambient for HRB 88/90. For lower hardness (HRB 82/87), heat to 1560°F (850°C) with 1–2h hold, furnace cool ≤50°F/h to 1200°F (650°C), then air cool.
Hardening：TRIMRITE suits batch & continuous furnaces. To reach HRC 49/52, heat to 1900°F (1040°C) and quench in oil, forced air or gas. Small parts require 15min holding, large sections up to 1h. Use N₂/Ar (dew point ≤-40°F/-40°C) for shielding; avoid dissociated ammonia to prevent nitriding and poor corrosion resistance.
Tempering：Post-hardening temper at 350/400°F (177/204°C) for 1–2h; temper up to 600°F (316°C) if lower hardness is needed.
10.Workability
Cold Working：The cold forming characteristics of TRIMRITE in operations such as heading, thread rolling, slotting, extrusion, drawing, and flattening are similar to a number of other 400 series martensitic stainless steels. Field trials have shown the cold headability to be only slightly less than 410.
Machinability：TRIMRITE is normally machined in the annealed condition and is similar to 420. Cutting tools must be kept sharp.
A coolant consisting of a chlorinated mineral oil with sulfur should be satisfactory for most machining operations.
11.Contact Us
In addition to Pyromet®350 (UNS S35000), our product portfolio also covers premium martensitic stainless steel TRIMRITE® (UNS S42010). We supply diversified specialty alloy bars, pipes, fittings and customized machined parts for global clients across aerospace, power generation, petrochemical and machinery manufacturing industries.
