RAYCHIN LIMITED

Nitronic Studs – Complete Product Range

Critical Applications of Nitronic Studs

International Standards & Global Designations – Nitronic Stud Materials

RAYCHIN LIMITED manufactures Nitronic studs from material conforming to the most widely used national and international specifications. All material is traceable to the mill.

Chemical Composition (Weight %) – Nitronic Alloys for Studs

Our Nitronic studs are produced from material conforming to the limits of applicable ASTM, AMS, and ASME standards.

Nitronic 50 (UNS S20910 / XM-19)

Nitronic 60 (UNS S21800 / Alloy 218)

Nitronic 32 (UNS S24100 / XM-28)

Metallurgical note: Nitronic alloys are nitrogen‑strengthened austenitic stainless steels. Nitrogen provides solid‑solution strengthening, increasing yield strength without sacrificing ductility or toughness. Nitronic 50 contains molybdenum and columbium for enhanced pitting and crevice corrosion resistance, with a PRE (Pitting Resistance Equivalent) of 34‑38, exceeding that of 316L (24‑26). Nitronic 60 achieves exceptional galling resistance due to its high silicon and manganese content, which promotes a low stacking‑fault energy and rapid work‑hardening, preventing metal transfer during sliding. This makes it ideal for threaded studs subject to frequent assembly. Nitronic 32 is a high‑manganese grade with excellent strength and moderate corrosion resistance. All grades are non‑magnetic in the annealed condition and retain high strength at cryogenic temperatures.

Complete Mechanical & Physical Properties – Nitronic Alloys for Studs (MPa / ksi)

Nitronic studs are supplied in appropriate conditions (annealed, strain hardened) per ASTM A193, ASTM F593, and ASME specifications. Data represent typical values based on industry standards.

Nitronic 50 (XM-19) – Mechanical Properties

Nitronic 60 (Alloy 218) – Mechanical Properties

Nitronic 32 (XM-28) – Mechanical Properties

High‑Temperature Mechanical Properties – Nitronic 50 (representative)

Physical Properties – Nitronic Alloys

High‑Temperature Performance of Nitronic Studs

Nitronic alloys maintain useful mechanical properties at elevated temperatures, making them suitable for many high‑temperature stud applications. Nitronic 50 exhibits good strength up to 600°C (1112°F) with oxidation resistance similar to 304/316 stainless steels. It retains significant yield strength at 650°C (570 MPa tensile, 290 MPa yield). Nitronic 60 retains strength up to 570°F (300°C) and offers superior galling resistance even at elevated temperatures, with good oxidation resistance up to 815°C due to its high silicon content. Nitronic 32 (high manganese grade) provides strength up to 650°C with good oxidation resistance and is often used for furnace components. For continuous service above 500°C, Nitronic 50 is preferred due to its molybdenum content. The alloys resist scaling in air up to 870°C (1600°F) intermittently and up to 925°C (1700°F) continuously for Nitronic 50. Nitronic 60's high silicon content improves oxidation resistance at high temperatures, making it suitable for exhaust system studs and heat treat fixtures.

Elevated Temperature Capabilities

Exceptional Corrosion Resistance of Nitronic Studs

Nitronic alloys offer outstanding corrosion resistance in various environments, often surpassing conventional stainless steels. Nitronic 50 was developed to provide superior resistance to chloride pitting and crevice corrosion compared to 316L and 317L, with PRE of 34‑38. It is highly resistant to stress corrosion cracking in chloride environments. Nitronic 60 provides excellent resistance to aqueous corrosion, similar to 304, but with superior resistance to galling and metal‑to‑metal wear. Nitronic 32 offers good general corrosion resistance, comparable to 304, with high strength.

• Pitting & Crevice Corrosion: Nitronic 50 outperforms 316L and 317L in ASTM G48 pitting tests. Critical pitting temperature (CPT) for Nitronic 50 is typically >40°C in 6% FeCl3, compared to 25°C for 316L. Nitronic 60 offers pitting resistance superior to 316 in chloride media.
• Stress Corrosion Cracking (SCC): Nitronic 50 exhibits excellent resistance to SCC in chloride environments, while Nitronic 60 and 32 offer moderate resistance similar to 304.
• Galling Resistance: Nitronic 60 is world‑renowned for its galling resistance. In self‑mated tests, it exhibits threshold galling stress > 34 MPa (5 ksi) – orders of magnitude higher than 304 or 316. Ideal for threaded studs, valve stems, and pump components subject to frequent assembly/disassembly.
• Marine / Seawater: Nitronic 50 is widely used in seawater applications due to its high pitting resistance and low magnetic permeability. Nitronic 60 is used in boat shafting and marine valve components.
• NACE Compliance: Nitronic 50 and Nitronic 60 meet NACE MR0175 / ISO 15156-3 for sour service environments (up to certain hardness limits), making them suitable for oil & gas stud bolting.
• Sulfidation Resistance: Nitronic alloys perform well in sulfur‑containing environments, with Nitronic 60's high silicon content providing additional resistance.
• Intergranular Corrosion: All Nitronic grades resist sensitization due to low carbon content and nitrogen stabilization, passing ASTM A262 Practice E tests.

Manufacturing Standards – Nitronic Studs

All Nitronic studs are manufactured and tested to meet the following standards:

We offer surface finishes: plain (as‑machined), passivated, electro‑polished. Silver plating per AMS 2410 available for anti‑seize and enhanced conductivity – recommended for aerospace studs in high‑temperature applications. Controlled strain hardening and heat treatment processes per ASTM A193 ensure optimal mechanical properties. For Nitronic 50, solution annealing at 1065-1120°C (1950-2050°F) followed by water quenching. Nitronic 60 studs are strain hardened to achieve required strength levels. NADCAP accredited processing available. Specialized thread rolling and precision machining for accurate stud geometry per ASME, ISO, DIN, and NAS standards. Class 2A/3A/6g thread fit. 100% inspection available. Full traceability and destructive/non‑destructive testing available (UT, FPI, MPI). AS9100 and ISO 9001:2015 certified quality management. Build‑to‑print specials to customer specifications are available.