Monel 502 (UNS N05502) - Age Hardenable Ni-Cu Alloy Supplier of Bars, Forgings & Castings | Shanghai Hangbo Alloy Group
Date: 2026年8月12日 Categories: News Views: 242
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 502?
Monel 502 (UNS N05502) is an age-hardenable nickel-copper alloy, the cast-friendly sibling of Monel K-500. With 63% nickel, 28% copper, and aluminum + titanium additions, it develops precipitation-hardened strength (yield >=620 MPa aged) through a simple aging cycle while retaining Monel 400's outstanding seawater corrosion resistance. It is the standard material for seawater valve bodies, pump casings, and marine hardware requiring higher strength than Monel 400 but with castability superior to K-500. Shanghai Hangbo Alloy Group supplies Monel 502 as round bars, forgings, and investment castings.
Industry Pain Point: Shipboard seawater valve manufacturers face a choice: Monel 400 (castable but soft, yield 210 MPa) or Monel K-500 (strong, yield 790 MPa, but hot-tear prone in casting). Monel 502 splits the difference — age-hardenable to 620+ MPa yield with the casting fluidity of Monel 400 — giving valve designers strength with reliable castability for complex valve bodies and pump casings.
Key Properties at a Glance
| Property | Value |
|---|---|
| UNS Number | N05502 |
| Density | 8.50 g/cm3 |
| Tensile (Aged) | >= 790 MPa (115 ksi) |
| Yield (Aged) | >= 620 MPa (90 ksi) |
| Elongation (Aged) | >= 15% |
| Hardness (Aged) | 25-35 HRC |
| Key Standards | ASTM B865, QQ-N-286 |
Product Overview
Monel 502 is the precipitation-hardening member of the Monel 400 family designed with casting as a primary application. The 2.3% aluminum + 0.5% titanium additions enable the Ni₃(Al,Ti) γ′ precipitation that transforms the alloy from a soft (210 MPa yield) as-cast condition to 620+ MPa aged condition — approximately 3x strength increase.
Its position in the Monel family:
- Monel 400: Soft, castable, seawater-resistant — the baseline.
- Monel K-500: Strongest (790 MPa yield) but difficult to cast without hot tearing.
- Monel 502: Middle ground — age-hardenable to 620 MPa with reliable castability, the practical choice for cast valve bodies and pump casings.
Shanghai Hangbo Alloy Group supplies Monel 502 in bars (for trim and shafts), forgings, and investment/centrifugal castings.
Executive Standards
| Product Form | ASTM | Spec |
|---|---|---|
| Bar & Rod | ASTM B865 | QQ-N-286 |
| Forgings | ASTM B865 | QQ-N-286 |
| Castings | ASTM A494 (M-35-1) | QQ-N-286 |
| Plate & Sheet | ASTM B127 (modified) | -- |
Chemical Composition (wt.%)
| Element | Min | Max | Role |
|---|---|---|---|
| Ni (+Co) | 63.0 | 70.0 | Matrix |
| Cu | 27.0 | 33.0 | Seawater resistance |
| Al | 2.0 | 4.0 | γ′ former -- hardening |
| Ti | 0.25 | 1.0 | γ′ former |
| Fe | -- | 2.0 | Impurity |
| Mn | -- | 1.5 | Deoxidizer |
| Si | -- | 1.0 | Casting fluidity |
| C | -- | 0.25 | Casting control |
Mechanical Properties
| Condition | Tensile (MPa) | Yield (MPa) | Elongation (%) |
|---|---|---|---|
| As-Cast | 550-650 | 210-280 | 25-35 |
| Solution + Aged | >= 790 | >= 620 | >= 15 |
Heat Treatment
Solution Anneal: 980C (1800F), water quench.
Age: 590-650C (1100-1200F), 8-16 hours, furnace cool.
Industry Applications
| Industry | Component | Why 502? |
|---|---|---|
| Marine | Seawater valve bodies, pump casings | Strength + castability + seawater resistance |
| Offshore | Piping fittings, valve trim | High strength in chloride service |
| Chemical | Caustic/acid valve components | Monel corrosion + PH strength |
| Pumping | Impellers, wear rings | Abrasion + corrosion |
Quality Assurance: 7-Stage
- Raw Material: Ni, Cu, Al, Ti verified by OES.
- Melt: Al 2.0-4.0%, Ti 0.25-1.0%, S <=0.005% (hot shortness control).
- Casting: Controlled pouring temperature; X-ray inspection per ASTM E94.
- Solution Anneal: 980C verified.
- Aging Verification: Hardness 25-35 HRC; tensile per lot.
- NDE: 100% UT/RT for castings. PMI every piece.
- Documentation: EN 10204 3.1 MTC. SGS/TUV/BV witness.
Frequently Asked Questions
Q1: What is Monel 502 used for?
Seawater valve bodies, pump casings, impellers, and marine hardware requiring age-hardened strength with reliable castability.
Q2: 502 vs K-500?
K-500: yield 790 MPa, difficult to cast. 502: yield 620 MPa, castable. Choose K-500 for wrought shafts; 502 for cast components.
Q3: Is it magnetic?
Non-magnetic — same as all Monel grades.
Q4: What is the price?
$45-70/kg EXW. Contact sales@hangboalloy.com.
Q5: Product forms?
Bars, forgings, castings (investment/centrifugal), plate. SGS available.
Q6: What heat treatment?
Solution 980°C + age 590-650°C/8-16h.
Q7: What is the density?
8.50 g/cm3.
Q8: Does Shanghai Hangbo ship internationally?
Yes — FOB/CIF/DAP to 40+ countries.
Q9: What standards apply?
ASTM B865 (bar/forging), A494 (casting).
Q10: Can it replace Monel 400 directly?
For strength-critical service, yes — 3x yield with the same corrosion resistance.
Q11: What is the max service temperature?
~500°C continuous.
Q12: Why aluminum + titanium?
They precipitate γ′ Ni₃(Al,Ti) during aging — the hardening mechanism.
Q13: Is it weldable?
Yes, with ERNiCu-7 filler. Weld in solution-treated condition, re-age after.
Q14: How does it resist seawater?
Identical to Monel 400 — outstanding chloride resistance.
Q15: What is the casting advantage over K-500?
Better fluidity and lower hot-tearing tendency — reliable complex castings.
Contact Shanghai Hangbo Alloy Group
| Channel | Details |
|---|---|
| Company | Shanghai Hangbo Alloy Group Co., Ltd. - China Supplier |
| Website | www.nickel-alloy.com |
| Email (Sales) | sales@hangboalloy.com |
| Email (Technical) | hangbo@nickel-alloy.com |
| WhatsApp (Lisa) | +86 13611656360 |
| Address | Room 1508, No. 288 Shiyi Road, Baoshan District, Shanghai 200940, China |
Shanghai Hangbo Alloy Group - Complete Product Range
| Family | Available Grades |
|---|---|
| Pure Nickel | NI200, NI201, N4, N5, N6 |
| Monel | 400, 401, 404, 502, K-500, R-405 |
| Inconel | 600, 601, 617, 625, 690, 693, 706, 718, X-750, 725 |
| Incoloy | 800, 800H, 800HT, 825, 925, 926, 945, A-286, 25-6HN, 27-7MO |
| Hastelloy | C-276, C-22, C-2000, C-4, G-30, G-35, G-50, X, B-2, B-3, B-4, HYBRID-BC1, N |
| Super Austenitic | 904L, Alloy 28, Alloy 31, 254SMO, 20Mo-6, AL-6XN |
| Chromium-Rich | Alloy 33 |
| High-Strength Stainless | Nitronic 50, Nitronic 60, PH13-8Mo |
| Chlorination-Resistant | Alloy 45 |
| Nimonic | 75, 80A, 90, 95, 105, 115, 263 |
| Haynes | 25, 188, 214, 230, 242, 282, 556, HR-120, HR-160 |
| RA Series | RA330, RA333 |
| Precision | 1J22, 1J46, 1J50, 1J79, 1J85, 3J21, 4J32, 4J36, 4J45 |
| High-Strength | 18Ni250, 18Ni300, AerMet 100 |
| Heating | Cr20Ni80, Cr40Ni60 |
| Specialty | Alloy 20, Alloy 59, Inconel 686, 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. Contact: sales@hangboalloy.com | WhatsApp (Lisa): +86 13611656360 | www.nickel-alloy.com
