Overview
What is 2.4643?
2.4643 is the European material number (Werkstoff-Nr.) for Hastelloy G-35 — a high-chromium nickel-chromium-molybdenum alloy also known as Alloy G-35 and UNS N06035. With roughly 33% chromium and 8% molybdenum, it was developed to resist wet-process phosphoric acid used in fertilizer production, and it is extremely resistant to nitric and other oxidizing acids while also resisting chloride-induced pitting, crevice corrosion and stress-corrosion cracking.
As an open-die forging factory, Jiangyin Jiangnan Metal Co., Ltd. manufactures 2.4643 open-die forgings and seamless rolled rings to customer drawings — melted by EAF + AOD/VOD with ESR, forged and solution-annealed, ultrasonically tested, and delivered with EN 10204 3.1 or 3.2 certification.
Product forms
2.4643 forged products we supply
Every item is forged to the customer's size, weight or drawing. Typical 2.4643 (Hastelloy G-35) forged product forms include:
- Forged rings
- Seamless rolled rings
- Forged flanges
- Forged round bars
- Forged disks & discs
- Forged shafts
- Forged sleeves
- Forged bushings
- Forged tube sheets
- Forged tubes & pipe
- Forged gears & spindles
- Forged blocks & nozzles
- Forged crankshafts
- Forged valve stems
- Forged valve seats & bodies
Technical data
Chemical composition of 2.4643
Limiting chemical composition of 2.4643 / Hastelloy G-35 (weight %), to ASTM B575 / UNS N06035:
| Element | 2.4643 (Hastelloy G-35) |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 32.25 – 34.25 |
| Molybdenum (Mo) | 7.60 – 9.00 |
| Iron (Fe) | 2.0 max |
| Tungsten (W) | 0.60 max |
| Cobalt (Co) | 1.0 max |
| Carbon (C) | 0.05 max |
| Silicon (Si) | 0.60 max |
| Manganese (Mn) | 0.50 max |
| Vanadium (V) | 0.20 max |
| Aluminium (Al) | 0.40 max |
| Copper (Cu) | 0.30 max |
| Phosphorus (P) | 0.04 max |
| Sulfur (S) | 0.015 max |
Composition is indicative and given to ASTM B575 / UNS N06035 limits; the certified analysis of each heat is stated on the mill test report.
Technical data
Physical & mechanical properties
| Property | Value |
|---|---|
| Density | 8.22 g/cm³ |
| Melting range | 1332 – 1361 °C |
| Thermal conductivity | 10 W/m·K |
| Specific heat | 450 J/kg·K |
| Structure | Face-centred cubic (austenitic) |
| Property | Typical |
|---|---|
| Tensile strength | ≥ 690 MPa (100 ksi) |
| Yield strength (0.2%) | ≥ 310 MPa (45 ksi) |
| Elongation | ≥ 40% |
| Condition | Solution annealed ~1120 °C |
Mechanical values are typical for the solution-annealed condition; actual properties depend on section size, product form and heat treatment and are confirmed on the certificate.
Manufacturing
How we make 2.4643 forgings
- Melting: EAF + AOD/VOD refining with ESR (electro-slag remelting) for clean, homogeneous 2.4643 ingot.
- Open-die forging: rings, shafts, disks, blocks and bars forged from the ingot; seamless rings rolled to size.
- Heat treatment: solution annealing (~1120 °C) with rapid cooling, to the applicable specification.
- NDT: ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388.
- Testing: chemical analysis, mechanical testing, intergranular-corrosion and PMI as required.
- Certification: EN 10204 3.1 or 3.2 (third-party) material certificate with every order.
Specifications
Standards & equivalents
| System | Designation / standard |
|---|---|
| Werkstoff-Nr. (EN) | 2.4643 |
| UNS | N06035 |
| Common / trade names | Hastelloy G-35, Alloy G-35 |
| ASTM — plate / sheet / strip | B575 |
| ASTM — bar / rod | B574, B472 |
| ASTM — seamless pipe / tube | B622 |
| ASTM — welded pipe / tube | B619, B626 |
| ASTM — fittings | B366, B462 |
| ASTM — forgings | B564, B462 |
| ASME | SB-564, SB-574, SB-575, SB-622 |
| Other | AMS 5936, NACE MR0175 |
Where it is used
Applications of 2.4643 forgings
Because of its resistance to oxidizing acids and chloride corrosion, 2.4643 (Hastelloy G-35) forged parts are used across the process industries:
01 Phosphoric acid & fertilizer
Wet-process phosphoric-acid reactors, evaporators, agitators, heat exchangers and piping in fertilizer plants — the service the alloy was designed for — as forged rings, flanges, shafts, tube sheets and valve parts.
02 Nitric & mixed acids
Nitric acid and nitric/hydrofluoric pickling and mixed-acid service, where the high chromium content gives outstanding resistance to oxidizing media.
03 Chemical & process
Pressure vessels, columns and towers, shell-and-tube heat exchangers, chemical pumps and valves handling chloride-bearing media — resisting pitting, crevice corrosion and stress-corrosion cracking.
04 Pollution control
Flue-gas desulfurization (FGD) systems, scrubbers, and industrial waste and effluent treatment equipment exposed to aggressive, chloride-rich condensates.
05 Oil, gas & sour service
Sour-service components to NACE MR0175, wellhead and downstream parts — forged bushings, sleeves, disks, discs and valve components where corrosion and SCC resistance are critical.
06 Other severe-corrosion service
Pharmaceutical and biochemistry equipment, evaporator and crystallizer parts, and general severe-corrosion service — forged rings, spindles, bars and rolls.
The manufacturer
Jiangyin Jiangnan Metal Co., Ltd.
An open-die forging factory in Jiangyin, China, producing carbon steel, alloy steel, tool steel, stainless steel and nickel-alloy forgings — including 2.4643 (Hastelloy G-35) forged rings, seamless rolled rings, flanges, bars, disks, shafts, sleeves, bushings, tube sheets and pipe — made to customer drawings for the chemical, fertilizer, oil & gas, pollution-control and power industries worldwide.
Address No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
Phone +86-189-2135-9659
Email sales@steelforgepieces.com
Web www.steelforgepieces.com
Answers
Frequently asked questions about 2.4643
What is 2.4643 equivalent to?
2.4643 is equivalent to Hastelloy G-35, Alloy G-35 and UNS N06035. Product standards include ASTM B575 (plate/sheet/strip), B574 (bar/rod), B564 (forgings) and B622 (seamless pipe/tube), plus AMS 5936 and NACE MR0175. It is a distinct grade from 2.4642 (Alloy 690).
What is the chemical composition of 2.4643?
Nickel balance, chromium 32.25–34.25%, molybdenum 7.60–9.00%, iron 2.0% max, tungsten 0.60% max, cobalt 1.0% max, carbon 0.05% max, silicon 0.60% max, manganese 0.50% max, vanadium 0.20% max, aluminium 0.40% max, copper 0.30% max, phosphorus 0.04% max and sulfur 0.015% max.
What standards apply to 2.4643 forgings?
Forgings are supplied to ASTM B564 / B462, with related product standards B575 (plate/sheet), B574/B472 (bar/rod), B622 (seamless pipe/tube) and B619/B626 (welded pipe/tube), and the matching ASME SB grades. Ultrasonic testing is to EN 10228-3, SEP 1921 or ASTM A388, with EN 10204 3.1/3.2 certification.
What forged forms of 2.4643 can you supply?
Forged rings, seamless rolled rings, flanges, round bars, disks and discs, shafts, sleeves, bushings, tube sheets, tubes and pipe, gears, spindles, blocks, nozzles and valve parts — all made to your size or drawing.
What is 2.4643 (Hastelloy G-35) used for?
Wet-process phosphoric acid and fertilizer plant equipment, nitric and mixed-acid service, flue-gas desulfurization and pollution control, heat exchangers, pressure vessels, columns, pumps and valves in chloride-bearing media, and sour oil-and-gas service where resistance to oxidizing acids, pitting, crevice corrosion and stress-corrosion cracking is required.
Who manufactures 2.4643 open-die forgings?
Jiangyin Jiangnan Metal Co., Ltd., an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. Contact +86-189-2135-9659 or sales@steelforgepieces.com.
How do I request a quote for 2.4643 forgings?
Send the required size, weight or drawing to sales@steelforgepieces.com or call +86-189-2135-9659. We will quote by product form, dimensions, quantity, applicable standard and required certification.
Need 2.4643 (Hastelloy G-35) forgings?
Send us your size or drawing — we will quote the best price for your project.