Hastelloy G-35 (UNS N06035) – Supplier of Round Bars, Seamless Tubes & Plates | Shanghai Hangbo Alloy Group

By Shanghai Hangbo Alloy Group Co., Ltd. | ISO 9001:2015 | Est. 2012 | Shanghai, China

Contact: sales@hangboalloy.com | hangbo@nickel-alloy.com | WhatsApp: +86 13611656360

Quick Answer: What Is Hastelloy G-35?

Hastelloy G-35 (UNS N06035 / W.Nr. 2.4643) is the "fertilizer-grade" nickel-chromium-molybdenum superalloy specifically developed to outperform all previous alloys — including G-30 — in wet-process phosphoric acid (WPA) service. With an extraordinary 33.2% chromium content, it delivers the highest resistance to oxidizing acids and fluoride-contaminated media in the G-series family. Shanghai Hangbo Alloy Group supplies Hastelloy G-35 in precision round bars, seamless tubes, and plates with full EN 10204 3.1 traceability for the world's largest fertilizer and chemical processing plants.

Key Properties at a Glance

The Fertilizer Corrosion Battle: Why G-35 Replaces G-30

Pain Point 1: The 30% Cr Ceiling Is Not Enough

Wet-process phosphoric acid contains residual H₂SO₄, HF, H₂SiF₆, and chloride contamination. While G-30's 30% chromium provides excellent resistance, G-35's 33.2% Cr + 8.1% Mo combination raises the passivation threshold to a level where pitting initiation in fluoride-rich WPA becomes essentially zero. We've replaced G-30 evaporator tubes that pitted after 5 years with G-35 tubes that show zero measurable wall loss after the same service period.

Pain Point 2: Copper Content Destabilizes in Mixed Acid

Unlike G-30, G-35 eliminates copper entirely from the composition. In fertilizer-grade phosphoric acid where tramp chlorides create localized reducing pockets, copper in the alloy can form cathodic sites that accelerate galvanic attack. G-35's copper-free chemistry eliminates this subtle degradation mechanism.

Pain Point 3: Heat-Affected Zone Corrosion After Field Welding

When repair welding is done on phosphoric acid evaporators in the field, the heat-affected zone can become sensitized. G-35's optimized low-carbon and molybdenum balance suppresses carbide precipitation, allowing as-welded components to survive directly in WPA service without a full solution-anneal cycle — saving weeks of downtime.

How Shanghai Hangbo Protects Your Phosphoric Acid Assets

Product Overview

Hastelloy G-35 (UNS N06035) is the result of a focused metallurgical effort to answer one question: "Can we push the chromium content past 30% without making the alloy unmachinable and unweldable?" The answer was yes — by carefully balancing molybdenum (8.1%), eliminating copper, and strictly controlling iron (≤2%), Haynes International created an alloy that sets the standard for fertilizer plant longevity.

Shanghai Hangbo Alloy Group (est. 2012, Shanghai) supplies G-35 to phosphate fertilizer complexes, chemical equipment fabricators, and mining operations across 32 countries. ISO 9001:2015 certified.

Chemical Composition (wt.% per ASTM B581)

Mechanical Properties

Heat Treatment

• Solution Annealing: 1121 °C – 1149 °C (2050 °F – 2100 °F)
• Cooling: Water quench mandatory — chromium-rich carbides form in seconds if cooling is delayed
• Post-Weld: As-welded service is viable for non-structural repair; critical structural joints should be re-annealed

Industry Applications

FAQ

Q1: What is Hastelloy G-35 used for?

Primarily wet-process phosphoric acid (WPA) fertilizer plants, where it outperforms G-30 in fluoride-contaminated environments.

Q2: What is the density?

8.22 g/cm³.

Q3: What makes G-35 different from G-30?

G-35 has 33.2% Cr (vs 30%), is copper-free, and has lower iron (≤2% vs ≤17%), delivering better passivation and eliminating copper galvanic attack.

Q4: What is the melting point?

1330 – 1370 °C.

Q5: What is the tensile strength?

≥ 690 MPa (100 ksi) in the annealed condition.

Q6: What is the price per kg?

Market range: approximately $42–95 USD/kg. Contact sales@hangboalloy.com for a real-time quote.

Q7: Is G-35 weldable?

Yes — with matching filler; low-carbon chemistry minimizes sensitization risk.

Q8: Does Shanghai Hangbo ship internationally?

Yes — 32 countries. DDP/DAP/FOB/CIF available.

Q9: What forms do you supply?

Round bars (6–400mm), seamless tubes (OD 6–219mm), plates (1–100mm), and custom forgings.

Q10: How to verify genuine G-35?

Check Chromium ≥ 31.0% and Copper ≤ 0.30% on the MTC. PMI on arrival confirms.

Contact Shanghai Hangbo Alloy Group

Shanghai Hangbo Alloy Group Co., Ltd. — Founded 2012 | ISO 9001:2015 | The Phosphoric Acid Longevity Specialist | 32 Countries