Monel R-405 Procurement Whitepaper - Free-Machining Alloy Buyer's Guide | Shanghai Hangbo Alloy Group
Date: 2026年8月20日 Categories: News Views: 227
By Shanghai Hangbo Alloy Group Co., Ltd. - China Supplier | ISO 9001:2015 | Est. 2012
Contact: sales@hangboalloy.com | hangbo@nickel-alloy.com | WhatsApp (Lisa): +86 13611656360
Quick Answer: What Is Monel R-405 and Why Buy It?
Monel R-405 (UNS N04405) is a free-machining version of Monel 400 — the same 67% Ni-30% Cu chemistry with a controlled sulfur addition (0.025-0.060%) that breaks chips during machining. It is used exclusively for CNC-machined parts: valve stems, screw machine products, fasteners, and pump components in seawater/HF service. The sulfur makes it slightly less corrosion-resistant than Monel 400, so specify R-405 only where machining economics matter. Shanghai Hangbo Alloy Group supplies R-405 in bars and machined components.
Monel R-405 vs Monel 400 (The Trade-off)
| Property | R-405 (N04405) | Monel 400 (N04400) |
|---|---|---|
| Sulfur | 0.025-0.060% (controlled) | 0.024% max |
| Machinability | Excellent (chip-breaking) | Fair (gummy) |
| Corrosion | Good (slightly less) | Excellent |
| Tensile | 550-700 MPa | 480-650 MPa |
| Forms | Bar primarily | All forms |
| Use | Machined parts | Piping, vessels, sheet |
Rule: If you're machining it, use R-405. If you're welding/forming it, use Monel 400.
Specifications & Standards
| Form | Standard |
|---|---|
| Bar & Rod | ASTM B164 |
| Forgings | ASTM B564 |
| Chemical Check | Sulfur 0.025-0.060% (the signature) |
Price Guide (2026, EXW)
| Form | Price |
|---|---|
| Round Bar Ø10-100 mm | \$30-45/kg |
| Hex Bar (machining) | \$32-48/kg |
The 3 Buyers' Checks
- Sulfur verification: Ask for the sulfur analysis on the MTC — must be 0.025-0.060%. Below 0.025% = not true R-405 (it's just 400).
- Machinability test: A quick turning test should produce short, broken chips. If it strings like taffy, it's Monel 400.
- PMI confirmation: XRF confirms Ni ~65-70%, Cu ~28-33%.
FAQ
Q1: What is Monel R-405 used for?
CNC-machined parts: valve stems, screw machine products, fasteners, pump shafts in seawater/HF service.
Q2: What makes R-405 free-machining?
Controlled sulfur (0.025-0.060%) forms MnS inclusions that break chips during turning.
Q3: Is R-405 less corrosion-resistant than 400?
Slightly — the sulfur inclusions are initiation sites. Use 400 for welding/forming; R-405 for machining.
Q4: What is UNS N04405?
N04405 is Monel R-405. N04400 is Monel 400.
Q5: What does Shanghai Hangbo supply?
R-405 bars with sulfur-verified MTC and PMI reports. SGS/TUV/BV available.
Contact & Complete Product Range
Shanghai Hangbo Alloy Group Co., Ltd. - China Supplier
Email: sales@hangboalloy.com | WhatsApp (Lisa): +86 13611656360 | www.nickel-alloy.com
All Grades
Ni: NI200-N6 | Monel: 400-502, K-500, R-405 | Inconel: 600-740H, X-750, 725 | Incoloy: 800-27-7MO | Hastelloy: C-276-HYBRID-BC1, N | Super Austenitic: 904L-AL-6XN | Chromium-Rich: Alloy 33 | High-Strength Stainless: Nitronic 50/60, PH13-8Mo | Chlorination: Alloy 45 | Nimonic: 75-263 | Haynes: 25-HR-160 | RA: 330/333 | Precision: 1J22-4J45 | High-Strength: 18Ni250-AerMet100 | Heating: Cr20Ni80/60 | Specialty: Alloy 20-602CA
Product Forms: Bars(6-500mm) | Tubes(OD 6-610mm) | Plates(0.1-100mm) | Forgings | Welded Pipes | Fittings | Wire(0.05-10mm) | Strip(0.02-4.0mm)
SGS/BV/TUV. www.nickel-alloy.com
