ASTM B366 Hastelloy G35 Fittings – UNS N06035 (DIN 2.4643) Butt-Weld Fittings
ASC LLP, Mumbai, supplies ASTM B366 Hastelloy G35 fittings in UNS N06035 / DIN 2.4643 (NiCr33Mo8). The range covers elbows, tees, reducers, caps, stub ends and crosses, plus forged socket-weld and threaded fittings to ASTM B462 / B564, with EN 10204 3.1 certificates. See all Hastelloy fittings and our nickel alloy range.
What is Hastelloy G-35?
Hastelloy G-35 is a nickel-chromium-molybdenum alloy with about 33% chromium and 8% molybdenum. It was developed to resist wet-process (fertiliser-grade) phosphoric acid, and it outperforms other metallic materials in that service. Its very high chromium content also gives excellent resistance to nitric acid and other oxidising acids, and it resists caustic de-alloying in hot sodium hydroxide. It has good resistance to chloride pitting, crevice attack and stress-corrosion cracking. Resistance to reducing acids such as HCl is only moderate – for those, C-276 or C-22 is preferred.
Hastelloy G35 Fittings – Quick Facts
- Grade: Hastelloy G-35, UNS N06035, DIN 2.4643
- Butt-weld fittings: ASTM B366 / ASME SB366, dimensions to ASME B16.9
- Forged fittings: ASTM B462 / B564, dimensions to ASME B16.11
- Sizes: ½” – 24″ NB butt-weld (seamless or welded), SCH 5S – 80S; forged 1/8″ – 4″, Class 3000 / 6000
- Code limit: ASME Section VIII Div. 1 and B31.3 up to 427 °C (800 °F)
- Sour service: listed in NACE MR0175 / ISO 15156
Why Choose Hastelloy G-35?
- Phosphoric acid: the leading metallic material for wet-process phosphoric acid (P₂O₅) evaporators and concentrators.
- Oxidising acids: very resistant to nitric acid and nitric-containing mixtures, thanks to 33% chromium.
- Hot caustic: resists caustic de-alloying in hot sodium hydroxide, unlike other Ni-Cr-Mo alloys.
- Chlorides: resists pitting and crevice attack under deposits, and is much less prone to chloride stress-corrosion cracking than stainless steels.
- Fabrication: weldable with matching ERNiCrMo-22 filler; fittings supplied solution-annealed.
Types of Hastelloy G35 Fittings We Supply
- Butt-weld (ASTM B366, ASME B16.9): 45° / 90° / 180° elbows (LR and SR), equal and reducing tees, concentric and eccentric reducers, caps, stub ends, crosses.
- Forged (ASTM B462 / B564, ASME B16.11): socket-weld and threaded elbows, tees, couplings, half couplings, unions, plugs and bushings.
- Matching products: G-35 pipe (B622 seamless / B619 welded), plate (B575), bar (B574) and forged flanges (B564).
Related grades: Hastelloy G30 fittings, C276 fittings and C22 fittings.
Hastelloy G35 Fittings Size & Wall Thickness Chart (ASME B36.19)
| NPS | OD (mm) | SCH 5S (mm) | SCH 10S (mm) | SCH 40S (mm) | SCH 80S (mm) |
| ½” | 21.34 | 1.65 | 2.11 | 2.77 | 3.73 |
| ¾” | 26.67 | 1.65 | 2.11 | 2.87 | 3.91 |
| 1″ | 33.40 | 1.65 | 2.77 | 3.38 | 4.55 |
| 1½” | 48.26 | 1.65 | 2.77 | 3.68 | 5.08 |
| 2″ | 60.33 | 1.65 | 2.77 | 3.91 | 5.54 |
| 3″ | 88.90 | 2.11 | 3.05 | 5.49 | 7.62 |
| 4″ | 114.30 | 2.11 | 3.05 | 6.02 | 8.56 |
| 6″ | 168.28 | 2.77 | 3.40 | 7.11 | 10.97 |
| 8″ | 219.08 | 2.77 | 3.76 | 8.18 | 12.70 |
Fitting wall thickness matches the connecting pipe schedule. Larger sizes up to 24″ NB on request.
Mechanical Properties of Hastelloy G35 Fittings
| Property (ASTM minimum, solution-annealed) | Value |
| Tensile strength | 586 MPa (85 ksi) |
| Yield strength (0.2% offset) | 241 MPa (35 ksi) |
| Elongation | 30% |
Minimums per ASTM B575 / B622 / B574 for UNS N06035, which B366 fittings must meet. Typical plate values are higher (about 689 MPa tensile, 317 MPa yield, 70% elongation).
Hastelloy G35 Fittings Specifications
| Item | Details |
| Material | Hastelloy G-35, UNS N06035, DIN 2.4643 (NiCr33Mo8) |
| Butt-weld fittings | ASTM B366 / ASME SB366 |
| Forged fittings & flanges | ASTM B462, B564 / ASME SB462, SB564 |
| Dimensions | ASME B16.9 (butt-weld), ASME B16.11 (forged), MSS SP-43 (stub ends) |
| Pipe | ASTM B622 (seamless), B619 / B626 (welded) |
| Plate / bar | ASTM B575 / B574 |
| Construction | Seamless or welded (WPWX / CRWX / WPS etc. per B366) |
| Condition | Solution-annealed, pickled |
| Certificate | EN 10204 3.1; 3.2 / third-party inspection on request |
Chemical Composition of Hastelloy G35 (UNS N06035)
| Element | Composition (wt %) |
| Nickel (Ni) | Balance (≈ 58) |
| Chromium (Cr) | 32.25 – 34.25 |
| Molybdenum (Mo) | 7.60 – 9.00 |
| Iron (Fe) | 2.00 max |
| Cobalt (Co) | 1.00 max |
| Tungsten (W) | 0.60 max |
| Silicon (Si) | 0.60 max |
| Manganese (Mn) | 0.50 max |
| Aluminium (Al) | 0.40 max |
| Copper (Cu) | 0.30 max |
| Vanadium (V) | 0.20 max |
| Carbon (C) | 0.050 max |
| Phosphorus (P) | 0.030 max |
| Sulphur (S) | 0.015 max |
Physical Properties of Hastelloy G35
| Property | Value |
| Density | 8.22 g/cm³ |
| Melting range | 1,332 – 1,361 °C |
| Thermal conductivity (RT) | ≈ 10 W/m·K |
| Electrical resistivity | ≈ 1.18 µΩ·m |
| Thermal expansion (21–100 °C) | ≈ 12.3 µm/m·°C |
| Modulus of elasticity | ≈ 204 GPa |
Applications of Hastelloy G35 Fittings
| Industry | Applications for G35 fittings |
| Fertiliser / phosphoric acid | Wet-process phosphoric acid evaporators, concentrators and process piping |
| Chemical processing | Nitric acid and mixed-acid lines, oxidising chemical service |
| Caustic soda | Hot sodium hydroxide evaporators and piping |
| Oil & gas | Sour-service piping where NACE MR0175 materials are required |
| Pollution control | Scrubbers and effluent lines with chlorides and oxidising acids |
Hastelloy G35 vs G30, C276 & C22
| Alloy | Cr (%) | Mo (%) | Best suited for |
| G-35 (this page) | 32.25 – 34.25 | 7.6 – 9.0 | Wet-process phosphoric acid, nitric acid, hot caustic |
| G-30 | 28 – 31.5 | 4 – 6 | Phosphoric acid and oxidising mixtures (older grade) |
| C-276 | 14.5 – 16.5 | 15 – 17 | Reducing acids (HCl, H₂SO₄) and chlorides |
| C-22 | 20 – 22.5 | 12.5 – 14.5 | Mixed oxidising / reducing service |
Why Choose ASC LLP for ASTM B366 Hastelloy G35 Fittings?
- Correct grade: genuine UNS N06035 fittings to ASTM B366 / B462, with 3.1 certificates showing chemistry and tensile results.
- Complete packages: G-35 fittings with matching pipe, flanges and plate.
- Testing: PMI, dimensional checks, dye penetrant and IGC testing on request; third-party inspection welcome.
- Small quantities and export packing for project and maintenance orders.
Send fitting type, size, schedule and quantity to sales@amardeepsteel.com or call 022-67439130.
Frequently Asked Questions – Hastelloy G35 Fittings
What is Hastelloy G-35 used for?
Hastelloy G-35 (UNS N06035) is used mainly for wet-process phosphoric acid evaporators and piping in fertiliser plants, and for nitric acid, oxidising mixed acids and hot caustic soda service.
Which standard covers Hastelloy G35 fittings?
Butt-weld fittings are covered by ASTM B366 / ASME SB366 with dimensions to ASME B16.9. Forged socket-weld and threaded fittings are made to ASTM B462 or B564 with dimensions to ASME B16.11.
What is the chemical composition of Hastelloy G-35?
Hastelloy G-35 contains 32.25–34.25% chromium and 7.6–9.0% molybdenum, with iron 2.0% max and carbon 0.05% max, balance nickel (about 58%).
What are the mechanical properties of Hastelloy G35?
The ASTM minimums for UNS N06035 are 586 MPa (85 ksi) tensile strength, 241 MPa (35 ksi) yield strength and 30% elongation in the solution-annealed condition.
What is the difference between Hastelloy G-35 and C-276?
G-35 has about 33% chromium and 8% molybdenum, which makes it best for phosphoric acid, nitric acid and oxidising service. C-276 has about 16% each of chromium and molybdenum and is better in reducing acids such as hydrochloric and sulphuric acid.
What is the DIN number for Hastelloy G-35?
Hastelloy G-35 is DIN / W.Nr. 2.4643, designated NiCr33Mo8.
Global Reach
ASC LLP supplies Hastelloy and other nickel-alloy fittings to fertiliser, chemical and process plants in the USA, Europe, the Middle East and Asia, with secure packing and full documentation. Buyers worldwide rely on our ASTM B366 Hastelloy G35 fittings for certified material and traceability.
Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.
