Monel 400 Procurement Whitepaper
Date: 2026年9月17日 Categories: News Views: 350
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 the Biggest Risk When Buying Monel 400?
Monel 400 (UNS N04400) is a nickel-copper alloy costing 6-10x standard stainless steel — and that gap invites substitution. The frequent substitutes are 304/316L stainless (visually similar, slightly magnetic when cold worked) and Nickel 200 (which lacks copper). Because Monel 400's identity rests on its ~67% nickel and ~30% copper balance, a simple PMI reading for copper settles the question in seconds. This whitepaper gives 5 checks.
Why Monel 400 Is Substituted
- Price gap: 6-10x the price of 316L.
- Visual similarity: Bright, silvery, and only slightly magnetic.
- Specification ambiguity: "Monel" is sometimes used loosely in informal quotations.
- Copper is easy to miss: Buyers who only check nickel content accept Nickel 200 by mistake.
The 5 Checks (Do These Before Payment)
| Check | What It Proves | Method / Threshold |
|---|---|---|
| 1. PMI for Cu | Chemistry = N04400 | Cu 28-34%, Ni 63-70% |
| 2. Ni/Cu ratio | Not Nickel 200 or stainless | Cu must be present (28%+); Ni 200 has ~0% Cu |
| 3. Magnetic response | Cross-check | Slightly magnetic; 316L is non-magnetic |
| 4. MTC + heat number | Traceability | EN 10204 3.1 + mill heat number, ASTM B164/B127 |
| 5. Third-party inspection | Independence | SGS/BV/TUV witness PMI + certificate review |
Common Substitution Scenarios
| "Monel 400" Delivered | PMI Signature | Detection |
|---|---|---|
| Nickel 200 (N02200) | Cu < 0.25% | No copper → reject |
| 316L (S31603) | Fe ~65%, Cr 16-18% | Chromium present → reject |
| 304 (S30400) | Fe ~70%, Cr 18-20% | Chromium present → reject |
| Cupronickel 90/10 | Cu ~88% | Copper too high → reject |
Specification Reference
| Form | Standard |
|---|---|
| Bar & Rod | ASTM B164 |
| Plate/Sheet/Strip | ASTM B127 |
| Tube | ASTM B163 / B165 |
| Forgings | ASTM B564 |
| Annealing | 870-980C |
Price Reference (2026, EXW)
| Form | Fair Price |
|---|---|
| Plate | \$30-45/kg |
| Round Bar | \$30-45/kg |
| Tube | \$38-55/kg |
| Below \$20/kg | Suspicious — likely stainless substitute |
FAQ
Q1: How do I verify Monel 400?
PMI showing 28-34% Cu and 63-70% Ni, plus EN 10204 3.1 MTC with heat number.
Q2: Can Nickel 200 be sold as Monel 400?
Yes — they look identical. Only copper analysis reveals the difference.
Q3: Is Monel 400 magnetic?
Slightly magnetic in the annealed state; more so after cold working.
Q4: What standard applies to bar?
ASTM B164 for bar, rod and wire.
Q5: What hardness should annealed Monel 400 have?
Typically 110-150 HB.
Q6: Can stainless steel be mistaken for Monel?
Visually yes, but PMI shows chromium in stainless and none in Monel 400.
Q7: What does Shanghai Hangbo provide?
Monel 400 in plates, bars, tubes, and fittings with PMI reports and EN 10204 3.1 MTC. SGS/BV/TUV third-party inspection 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
