RA333 (UNS N06333) - Nickel-Base High Temperature Alloy Supplier of Bars, Tubes & Plates | Shanghai Hangbo Alloy Group
Date: 2026年8月6日 Categories: News Views: 217
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 RA333?
RA333 (UNS N06333 / W.Nr. 2.4606) is the nickel-base companion to RA330, containing 45% nickel, 25% chromium, and 3% cobalt with tungsten and silicon additions, delivering substantially higher creep-rupture strength than RA330 at temperatures to 1095°C while maintaining good resistance to carburization and oxidizing/sulfidizing atmospheres. It is the preferred upgrade when furnace components (radiant tubes, muffles, retorts) require longer creep life at 900-1050°C than the iron-base RA330 can deliver. Shanghai Hangbo Alloy Group supplies RA333 as round bars, seamless tubes, and plates.
Industry Pain Point: Horizontal radiant tube furnaces operating at 1000-1050°C are the "creep laboratory" of the heat treatment industry: RA330 tubes develop unacceptable sag and wall thinning after 8,000-12,000 hours because the iron-base alloy's creep strength at 1000°C is only ~5-10 MPa. Upgrading to RA333 — with 45% nickel providing 2-3x the creep-rupture life of RA330 at the same stress and temperature — extends tube replacement intervals from 18-24 months to 36-48 months, recovering the 1.5x cost premium through reduced downtime.
Key Properties at a Glance
| Property | Value |
|---|---|
| UNS Number | N06333 |
| W.Nr. | 2.4606 |
| Alloy Family | Nickel-Base High-Temperature (Fe-Ni-Cr-Co) |
| Density | 8.10 g/cm3 |
| Melting Range | 1350-1400C |
| Max Service Temp. | ~1095C (2000F) |
| Tensile (Ann.) | >= 550 MPa (80 ksi) |
| Yield (Ann.) | >= 240 MPa (35 ksi) |
| Elongation (Ann.) | >= 30% |
| Key Standards | ASTM B511/B512, B535/B536, B546 |
Product Overview
RA333 occupies the premium tier of the Rolled Alloys (RA) family. Where RA330 (UNS N08330) is the cost-effective iron-base workhorse for carburizing atmospheres, RA333 was engineered as its high-temperature upgrade — a nickel-base alloy with 45% Ni, 25% Cr, 3% Co, 3% W, and 1.25% Si that delivers:
- 2-3x creep-rupture life of RA330 at 900-1050°C, through the combination of higher nickel content (45% vs 35%) and tungsten solid-solution strengthening.
- Superior oxidation resistance to 1095°C from the elevated chromium.
- Carburization resistance comparable to RA330, plus improved resistance to oxidizing-sulfidizing atmospheres in thermal cycling service.
- Weldability and formability suitable for fabricated radiant tubes, retorts, and muffles.
The tungsten addition (2.5-3.5%) is the distinctive element: tungsten atoms are 3x heavier than iron and provide effective solid-solution strengthening at high temperatures by pinning dislocations and slowing diffusion-controlled creep.
Shanghai Hangbo Alloy Group supplies RA333 in bars, tubes, and plates with ASTM certification.
Executive Standards
| Product Form | ASTM | Notes |
|---|---|---|
| Bar & Rod | ASTM B511 / B512 | Hot-rolled or cold-drawn |
| Seamless Pipe & Tube | ASTM B535 / B536 | Radiant tubes, heater tubes |
| Plate, Sheet & Strip | ASTM B546 | Fabricated retorts, muffles |
| Forgings | ASTM B564 | Rings, flanges |
Chemical Composition (wt.%)
| Element | Min | Max | Role |
|---|---|---|---|
| Ni | 44.0 | 48.0 | Creep strength; carburization resistance |
| Cr | 24.0 | 27.0 | Oxidation resistance |
| Co | 2.5 | 4.0 | Matrix strengthening |
| W | 2.5 | 4.0 | Tungsten — solid-solution creep strengthener |
| Si | 1.0 | 1.5 | SiO₂ sub-scale; carburization barrier |
| Fe | Balance | -- | Matrix element |
| C | -- | 0.08 | Carbide strengthening |
| Mn | -- | 2.0 | Deoxidizer |
| S | -- | 0.03 | Impurity control |
Mechanical & Physical Properties
Room-Temperature (Solution-Annealed)
| Property | Value |
|---|---|
| Tensile Strength | >= 550 MPa (80 ksi) |
| Yield Strength 0.2% | >= 240 MPa (35 ksi) |
| Elongation | >= 30% |
| Hardness | ~80-90 HRB |
Elevated-Temperature Creep-Rupture (Typical, 10,000 h)
| Temperature | RA333 Stress | RA330 Stress |
|---|---|---|
| 815C | 55 MPa | 28 MPa |
| 870C | 38 MPa | 18 MPa |
| 925C | 24 MPa | 11 MPa |
| 980C | 14 MPa | 6 MPa |
Heat Treatment
Solution Annealing: 1121-1177C (2050-2150F), rapid air cool or water quench. No precipitation hardening.
Industry Applications
| Industry | Component | Why RA333? |
|---|---|---|
| Heat Treatment | Horizontal radiant tubes, muffles, retorts | 2-3x creep life vs RA330 at 1000C |
| Petrochemical | Ethylene furnace convection tubes | Creep + carburization at 900-1000C |
| Incineration | Afterburner chambers, kiln components | Oxidation + sulfidizing at 1000C+ |
| Metal Processing | Annealing furnace rolls, fixtures | Creep resistance under load at 950-1050C |
Quality Assurance: 7-Stage
- Raw Material: Ni, Cr, Co, W, Si analyzed by OES. Tungsten source purity verified.
- VIM/AOD Melt: W 2.5-4.0%, Co +/-0.3%, Si 1.0-1.5% control.
- Hot Working: 1150-1200C, finishing >=1000C, reduction >=4:1.
- Solution Anneal: 1121-1177C verified.
- Creep Testing: 10,000-h creep-rupture verification on request per lot.
- NDE: 100% UT bars >=50mm; ET/hydro tubes. PMI every piece.
- Documentation: EN 10204 3.1 MTC. SGS/TUV/BV witness.
Frequently Asked Questions
Q1: What is RA333 used for?
Horizontal radiant tubes, muffles, and retorts in heat treatment furnaces at 900-1050°C; ethylene furnace convection tubes; incinerator afterburner components.
Q2: RA333 vs RA330?
RA333: 45% Ni, 25% Cr, 3% Co, 3% W — 2-3x creep-rupture life at 1000°C. RA330: 35% Ni, 19% Cr, 1.2% Si — cost-effective, excellent carburization resistance. Upgrade to 333 for creep-limited high-temp service.
Q3: What makes RA333 creep-resistant?
45% nickel + 3% tungsten provide solid-solution strengthening — tungsten pins dislocations and slows diffusion-controlled creep at 900-1050°C.
Q4: Is it weldable?
Yes, with ERNiCrCoMo-1 (matching RA333) or ERNiCr-3 filler. GTAW preferred.
Q5: What is the price?
$35-60/kg EXW — 1.5x RA330. Contact sales@hangboalloy.com.
Q6: What product forms?
Bars (6-300mm), seamless tubes (OD 10-219mm), plates (3-50mm), forgings. SGS available.
Q7: What is the maximum service temperature?
~1095°C (2000°F) continuous.
Q8: What is the density?
8.10 g/cm3.
Q9: What heat treatment?
Solution annealing at 1121-1177°C, rapid cool. No aging.
Q10: Does it resist carburization?
Yes — comparable to RA330, with the SiO₂ sub-scale blocking carbon diffusion.
Q11: Does Shanghai Hangbo ship internationally?
Yes — FOB/CIF/DAP to 40+ countries.
Q12: What is the tensile strength?
>=550 MPa, yield >=240 MPa, elongation >=30%.
Q13: Why tungsten?
W (2.5-4.0%) provides solid-solution strengthening — the primary creep-resistance mechanism at 900-1050°C.
Q14: What standards apply?
ASTM B511/B512 (bar), B535/B536 (tube), B546 (plate).
Q15: How does the creep life compare at 980°C?
RA333: ~14 MPa for 10,000-h rupture. RA330: ~6 MPa. RA333 delivers 2.3x the allowable stress.
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, K-500, R-405 |
| Inconel | 600, 601, 617, 625, 690, 718, X-750, 725 |
| Incoloy | 800, 800H, 800HT, 825, 925, 926, A-286, 25-6HN, 27-7MO |
| Hastelloy | C-276, C-22, C-2000, C-4, G-30, G-35, X, B-2, B-3, B-4, N |
| Super Austenitic | 904L, Alloy 28, Alloy 31, 254SMO |
| Chromium-Rich | Alloy 33 |
| 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, PH13-8Mo |
| 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
