Corrosion-Resistant Alloy Fasteners Guide

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1. Comprehensive List of Corrosion-Resistant Alloy Materials for Fasteners

Category	Alloy Family	Key Grades (Trade Names)	UNS Number	Primary Characteristics
Stainless Steels	Austenitic	304, 316/L, 317L, 904L, 254 SMO® (6Mo)	S30400, S31603, S31703, N08904, S31254	Cr-Ni-Mo base; excellent general corrosion resistance; 6Mo grades excel in chlorides.
	Duplex & Super Duplex	2205, 2507, Zeron® 100	S32205, S32750, S32760	High Cr, Mo, N; high strength, excellent SCC & pitting resistance.
	Martensitic & PH	410, 17-4PH®, 15-5PH®, Custom 450®	S41000, S17400, S15500, S45000	Heat-treatable for high strength; good corrosion resistance (PH > martensitic).
	Precipitation-Hardening (PH) Super Alloys	A-286, Pyromet® 718 (similar to IN718)	K66286, N07718	Austenitic Fe-Ni base; high strength and oxidation resistance up to ~700°C.
Nickel-Based Alloys	Nickel-Copper	Monel® 400, Monel® K-500	N04400, N05500	Excellent resistance to seawater, sulfuric/ hydrofluoric acids, and alkalis. K-500 is age-hardenable.
	Nickel-Chromium (Inconel®)	Inconel® 600, 601, 617, Inconel® 718, 725, X-750	N06600, N06601, N06617, N07718, N07725, N07750	Outstanding oxidation & high-temp resistance. 718/725 offer ultra-high strength + corrosion resistance.
	Nickel-Chromium-Molybdenum (Hastelloy®)	Hastelloy® C-276, C-22®, C-2000®, Hastelloy® X	N10276, N06022, N06200, N06002	"The Ultimate Chemical Resistance." Superior in hot oxidizing/reducing acids, chlorides, and pitting/SCC.
	Nickel-Chromium-Iron (Incoloy®)	Incoloy® 825, 925, A-286	N08825, N09925, K66286	Good general corrosion & high-temp resistance; often more cost-effective than higher Ni alloys.
Cobalt-Based Alloys	MP Series	MP35N®, MP159®	R30035, R30159	Unique cold-work + aged strengthening. Unmatched combo of ultimate strength (>300 ksi), toughness, and corrosion resistance.
Titanium Alloys	Commercially Pure & Alpha-Beta	Grade 2, Grade 5 (Ti-6Al-4V), Grade 9 (Ti-3Al-2.5V)	R50400, R56400, R56320	Exceptional strength-to-weight ratio; perfect immunity to chlorides & seawater under ~80°C; prone to crevice corrosion at high T.
Copper-Based Alloys	Bronze & Brass	Silicon Bronze (C65500), Naval Brass (C46400), CuNi 70/30 (C71500)	C65500, C46400, C71500	Good general corrosion & biofouling resistance; excellent for marine hardware and plumbing.
Specialty & Exotic Alloys	Refractory Metals	Tantalum (Ta), Zirconium (Zr)	R05200, R60702	Nearly inert in many acids (e.g., Ta in HCl, H2SO4). Used as solid or cladding for extreme chemical service.

2. Corrosion Resistance Data Comparison (Qualitative)

Rating Scale: ★★★ (Excellent), ★★ (Good), ★ (Fair), ☆ (Poor/Not Recommended). Ratings are general and environment-specific.

Material (Example Grade)	Chloride Pitting/Crevice	Chloride SCC	Reducing Acids (e.g., HCl, H₂SO₄)	Oxidizing Acids (e.g., HNO₃)	Marine/Seawater	High-Temp Oxidation	Caustic (Alkali)
316L Stainless	★★	★	★ (Cold, Dilute)	★★★	★★	★★	★★
254 SMO® (6Mo)	★★★	★★★	★★	★★★	★★★	★★	★★
Super Duplex 2507	★★★	★★★	★★	★★	★★★	★	★★★
17-4PH (H1150)	★★	★★	★	★★	★★	★★	★★
A-286 / Pyromet 718	★★	★★★	★	★★	★★	★★★	★★
Monel 400	★★★	★★★	★★★ (HCl)	☆	★★★	★★	★★★
Inconel 718	★★★	★★★	★★	★★★	★★★	★★★	★★
Hastelloy C-276	★★★	★★★	★★★ (Hot, Conc.)	★★★	★★★	★★	★★★
MP35N®	★★★	★★★	★★★	★★	★★★	★★	★★
Ti Grade 5	★★★*	★★★*	☆ (to reducing acids)	★★★ (to oxidizing)	★★★*	★★	★ (to ~80°C)

Critical Note: Titanium (★★★*) is outstanding in seawater below ~80°C but suffers severe crevice corrosion at elevated temperatures. Always consult corrosion tables for specific media.

3. Alloy Characteristics & Dominant Application Fields

Austenitic Stainless (316L, 904L): General industry, marine hardware, food processing. Good all-rounders. 904L/6Mo for more aggressive chlorides.
Duplex Stainless (2205, 2507): Offshore oil & gas, chemical tankers, FGD systems. Ideal for chloride-rich, high-strength, and SCC-prone environments.
Precipitation-Hardening Alloys (17-4PH, A-286): Aerospace (engine, airframe), high-temperature bolting. Where high strength (up to 1300 MPa) and moderate corrosion resistance are required.
Nickel-Copper Alloys (Monel): Marine engineering, sulfuric acid systems, hydrocarbon processing. King of seawater and hydrofluoric acid resistance.
Nickel-Chromium-Molybdenum Alloys (Inconel/Hastelloy): Chemical processing (reactors, piping), pollution control, nuclear. The top choice for the most severe combinations of acids, chlorides, temperature, and stress.
Cobalt-Based Alloys (MP35N): Aerospace landing gear, medical implants, deepwater oilfield components. The premium choice for applications demanding simultaneous ultra-high strength (>1800 MPa), extreme toughness, and superb corrosion resistance.
Titanium Alloys (Grade 5, Ti-6Al-4V): Aerospace structures, marine components, chemical processing (oxidizing media). Where weight savings and seawater corrosion resistance are paramount.
Specialty Alloys (Tantalum, Zirconium): Pharmaceutical, fine chemical, and semiconductor industry reactors. For handling the purest and most aggressive acids where no metal ion contamination is allowed.

Consult the Experts at RAYCHIN for Your Mission-Critical Fastening Solutions

Selecting the optimal corrosion-resistant alloy requires balancing technical requirements, environmental conditions, and total lifecycle cost. The alloys listed above represent the pinnacle of materials engineering for fasteners.

For your specific application—whether it's for subsea Christmas trees, aerospace propulsion systems, chemical reactors, or biomedical devices—the RAYCHIN engineering team is here to help.

We provide:

Technical Consulting on alloy selection for your exact operating environment.
Full Traceability with material certifications (3.1/3.2) and heat code tracking.
Precision Manufacturing of fasteners to all major standards (ASTM, ASME, ISO) and custom prints.
Complete Supply Chain Support for high-integrity projects.

Don't compromise on performance or safety.

📞 Contact a RAYCHIN Sales Engineer today to discuss your project requirements and request a detailed technical datasheet or quotation.

Let RAYCHIN be your partner in solving the most challenging fastening problems with the most advanced corrosion-resistant alloys.