Hastelloy G30 Flanges

Request a Quote

Hastelloy G30 Flanges Technical Specifications

Feature	Details
Specifications	ASTM B564 / ASME SB564 / DIN 17744
Grade	UNS N06030 (Hastelloy G30, Alloy G30)
Material Designation	Nickel-Chromium-Molybdenum-Tungsten-Cobalt Alloy (Ni-Cr-Mo-W-Co)
UNS Number	N06030
Werkstoff Number	2.4603
Dimensional Standards	ANSI/ASME B16.5, B16.47 Series A & B, B16.48, MSS SP-44
Size Range	1/2" (15 NB) to 60" (1500 NB)
Pressure Class	150#, 300#, 400#, 600#, 900#, 1500#, 2500# (B16.5); 75#, 150#, 300#, 400#, 600#, 900# (B16.47)
Flange Types	Weld Neck, Slip-On, Blind, Socket Weld, Lap Joint, Threaded, Orifice, Long Weld Neck, Reducing
Flange Face	Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Male & Female, Tongue & Groove
Manufacturing Type	Hot Forged
Microstructure	Austenitic (FCC) Solid Solution (Solution Annealed)
Heat Treatment	Solution Annealed at 1150-1200-C + Rapid Water Quench (Mandatory)
Testing	Tensile, Hardness, Impact, PMI, Ferrite Detection, Ultrasonic
Inspection	Third Party Inspection by TUV, SGS, Bureau Veritas, Lloyd's, DNV GL, BV, ABS
Certifications	EN 10204 3.1B MTC, PED 2014/68/EU, CE Marked, ASME B31.3

Hastelloy G30 Equivalent Grades

Standard	USA	Germany	Europe	Japan	UK	CHINA
Hastelloy G30	UNS N06030	2.4603	2.4603	-	-	-
	ASTM B564 N06030	NiCr30Mo5W2.5	NiCr30Mo5W2.5
	Alloy G30	W.Nr. 2.4603
	Hastelloy G-30

Hastelloy G30 Chemical Composition

Mechanical Properties of Hastelloy G30 Flanges

Property	Requirement (Solution Annealed)	Testing Standard
Tensile Strength	655 MPa (95 ksi) minimum	ASTM E8
Yield Strength (0.2% offset)	310 MPa (45 ksi) minimum	ASTM E8
Elongation in 2"	40% minimum	ASTM E8
Hardness (Brinell)	170-230 HB (typical)	ASTM E10
Hardness (Rockwell B)	80-92 HRB (typical)	ASTM E18
Charpy V-Notch Impact	Excellent toughness	ASTM E23
Density	8.22 g/cm- (0.297 lb/in-)	-

Hastelloy G30 Flange Dimensions & Pressure Rating Chart

Pressure-Temperature Ratings for Hastelloy G30 Flanges (ASTM B564 N06030)

Temperature -F (-C)	Class 150	Class 300	Class 600	Class 900	Class 1500	Class 2500
-20 to 100 (-29 to 38)	285 psi	740 psi	1480 psi	2220 psi	3705 psi	6170 psi
200 (93)	260 psi	675 psi	1350 psi	2025 psi	3375 psi	5625 psi
400 (204)	218 psi	565 psi	1130 psi	1695 psi	2825 psi	4710 psi
600 (316)	170 psi	440 psi	880 psi	1320 psi	2200 psi	3665 psi
800 (427)	128 psi	330 psi	660 psi	990 psi	1650 psi	2750 psi
1000 (538)	85 psi	220 psi	440 psi	660 psi	1100 psi	1835 psi
1200 (649)	60 psi	155 psi	310 psi	465 psi	775 psi	1290 psi

Types of Hastelloy G30 Flanges Available

Hastelloy G30 Orifice Flange

Hastelloy G30 Threaded Flange

Hastelloy G30 Reducing Flange

Hastelloy G30 Lap Joint Flange

Hastelloy G30 Long Weld Neck Flange

Hastelloy G30 Socket Weld Flange

Hastelloy G30 Weld Neck Flange

Hastelloy G30 Blind Flange

Hastelloy G30 Slip-On Flange

Standard Flange Sizes & Weight Chart

Hastelloy G30 Weld Neck Flange Dimensions (ANSI B16.5 - Class 600 Sample)

Is Hastelloy G30 Good Quality for Phosphoric Acid and Sulfuric Acid Service?

Yes, Hastelloy G30 Hastelloy G30 (Alloy G30, UNS N06030) is known as the best nickel-based alloy to use in commercial-grade service in phosphoric acid, contaminated sulfuric acid, and complex oxidizing acid service, better resisting wet-processing phosphoric acid that contains impurities (fluorides, sulfates, chlorides, organic matter), sulfuric acid at all concentrations with contamination, and mixtures of lower-grade oxidizers, where imp Hastelloy G30 is a product designed by Haynes International in the 1970s to solve the shortcomings of the earlier G-series alloys as well as serve as the industry standard in commercial wet-process phosphoric acid equipment.

Balanced molybdenum (4-6%), tungsten (1.5-4.0%), controlled copper (1.5-2.5%), and niobium (0.3-1.5%) add to the high chromium (28-31.5%, which is far higher than that of C-276, 14.5-16.5%) make Hastelloy G30 extremely resistant to the complex corrosive environment of commercial-grade phosphoric acid. Wet-process phosphoric acid formed as a result of digesting phosphate rocks contains many corrosive impurities such as fluorides, sulfates, chlorides, ferric ions, aluminum compounds, and organic material, which form a very aggressive mixture of oxidizing reducing environment. The composition of G30 is especially designed to withstand this complicated corrosion mechanism.

Decades of field service and extensive testing can prove that Hastelloy G30 is superior in phosphoric acid conditions. In commercial wet-process phosphoric acid (usually 54 percent P2O5 concentration at temperatures up to 110 o C), G30 exhibits rates of corrosion that are generally 3-10 times lower than C-276 and far lower than 316L stainless steel or other typical materials. The alloy is highly resistant to uniform corrosion as well as localized attack such as pitting and crevice corrosion with the presence of both fluorides and chlorides.

Heat transfer G30 is an exceptional heat transfer choice in the full temperature range of dilute through concentrated (including oleum) and ambient temperature to boiling temperatures with sulfuric acid and its oxidizing contaminated impurities (such as ferric ions, nitrates, etc.), which promotes corrosion of other alloys. The molybdenum and tungsten contents provide good resistance to reducing conditions, whereas the high chromium content ensures a high resistance to oxidizing sulfuric acid than C-276.

The crucial point about the Hastelloy G30 is that it has a high level of resistance to nitric-hydrofluoric acid mixtures that is one of the strongest corrosive agents in the chemical processing. The great abundance of chromium gives it resistance against the oxidation of nitric acid and the balanced parental composition of Mo-W-Nb gives it protection against the highly formidable fluoride assault. This renders G30 invaluable in mixed acid pickling, stainless steel bright annealing, nuclear fuel reprocessing and semiconductor chemical applications in which HNO3-HF mixtures are used and all other alloys fail quickly.

Under the production of fertilizers, the industry standard of wet-process phosphoric acid equipment (reactors, evaporators, heat exchangers, piping systems, storage tanks) is G30. The alloy manages the entire process of phosphoric acid manufacturing by phosphate rock digestion by concentrating and purifying it, withstanding the convoluted blend of acids, salts, and contaminants that exist in the entire process. G30 is also very resistant to hot concentrated sulfuric acid and oleum in the manufacturing of sulfuric acid.

Hastelloy G30 is resistant to the oxidizing chloride solutions and resistant to chloride stress corrosion cracking. Although less adaptable C-276 in the entire gamut of chemical environments, G30 is more effective in phosphoric acid, contaminated sulfuric acid and nitric-hydrofluoric mixtures where its highly specialized composition delivers defining benefits. The alloy has good corrosion properties even at high temperatures as high as 650degC in the right environments.

Important applications are phosphoric acid manufacturing equipment (wet-process acid reactors, evaporators, concentrators, clarifiers, filters), sulfuric acid service (all concentrations, especially contaminated acid), nitric-hydrofluoric acid mixtures (pickling, bright annealing, etching), fertilizer manufacturing (full phosphoric acid process train), ore leaching (uranium, rare earths), chemical processing using mixed oxidizing acids and nuclear fuel reprocessing. G30 is common by specification in terms of ASME B31.3 Process Piping Code of service in phosphoric acid and contaminated sulfuric acid.

The major factor to keep in mind with Hastelloy G30 is that it is designed specifically to be used in certain environments (phosphoric acid, contaminated sulfuric acid, HNO3-HF mixtures) rather than a general-purpose and versatile alloy such as C-276. C-276 or other alloys can be more effective or cost-effective in other applications that are not in the specialty of G30. Nevertheless, in the case of phosphoric acid production, contaminated sulfuric acid and nitric-hydrofluoric mixtures, G30 special composition provides better performance that warrants specification even at a usually high cost relative to C-276.

Heat Treatment & Testing Requirements

Heat Treatment Requirements (Mandatory):

Process	Step / Parameter	Requirement	Remarks
Solution Annealing + Rapid Quenching	Solution Annealing Temperature	1150-1200-C (2100-2190-F)	Optimal for complete carbide dissolution
	Holding Time	Adequate soaking	Based on section thickness, typically 30+ min
	Cooling After Annealing	Rapid water quench	Essential for single-phase austenitic structure
Critical Cooling Rate	Fast cooling through critical range	Slow cooling causes carbide precipitation	Critical Requirement
Ferrite-free structure	Must be fully austenitic	Verify with ferrite detector

Testing & Inspection Requirements (Comprehensive):

Test / Inspection	Standard / Requirement	Acceptance / Remarks
Tensile Testing	ASTM E8	Yield = 45 ksi (310 MPa), Tensile = 95 ksi (655 MPa), Elongation = 40%
Hardness Testing	ASTM E10 / E18	Typical 170-230 HB (80-92 HRB)
Charpy Impact Testing	ASTM E23	Excellent toughness
PMI Testing	Positive Material Identification	Ni (=43%), Cr (28-31.5%), Mo (4-6%), W (1.5-4%), Cu (1.5-2.5%), Nb (0.3-1.5%)
Ferrite Detection	Ferritescope / Magnetic test	Must be ferrite-free (0% ferrite)
Ultrasonic Testing	ASTM A388	Mandatory for critical phosphoric acid applications
Corrosion Testing	ASTM G28 Method A (optional)	Verification of resistance to oxidizing acids

Hastelloy G30 Nickel-Chromium-Molybdenum-Tungsten-Cobalt Alloy Flanges Price List 2026

Applications of Hastelloy G30 Flanges in Industry

The Hastelloy G30 Flanges are commonly used in many industrial applications, and some of the common industries are given below.

Phosphoric Acid Production

Wet-process acid reactors, evaporators, concentrators, clarifiers, filters

Sulfuric Acid Service

All concentrations, particularly contaminated acid, oleum handling

Fertilizer Manufacturing

Complete phosphoric acid process train, mixed acid environments

Nitric-Hydrofluoric Acid

Pickling operations, bright annealing, etching, semiconductor chemicals

Ore Leaching

Uranium extraction, rare earth processing, mineral processing

Chemical Processing

Mixed oxidizing acid environments, complex acid mixtures

Nuclear Fuel

Reprocessing equipment handling HNO3-HF mixtures

Acid Concentration

Evaporators and concentrators for contaminated acids

Why Choose Hastelloy G30 Flanges from Metinox Overseas?

Metinox Overseas offers certified Hastelloy G30 (Alloy G30) nickel-chromium-molybdenum-tungsten-cobalt alloy flanges with fine solution annealing at 1150-1200 C, fast water quenching and full testing at commercial grade phosphoric acid and contaminated sulfuric acid. We have ISO 9001:2015 and PED certified production plants. All flanges will have EN 10204 3.1B Mill Test Certificates with full chemical analysis (Ni 43% and more, Cr 28-31.5% and more, Mo 4-6% and more, W 1.5-4% and more, Cu 1.5-2.5% and more, Nb 0.3-1.5% and more) with full tensile properties (tensile 95 ksi and more, yield 45 ksi and more, elongation 40% Our technical department gives professional advice on the choice of G30 material used in wet-process phosphoric acid equipment, contaminated sulfuric acid service, HNO3-HF mixtures, welding (AWS A5.14 ERNiCrMo-11 filler metal), and ASME B31.3 compliance, which is provided to phosphoric acid plants, fertilizer plants, ore leaching plants, and special acid processing plants globally.

Hastelloy G30 Flange Delivery Time & CIF Pricing by Country

Other Types of Hastelloy G30 Flanges

ASTM B564 N06030 Flanges, UNS N06030 Weld Neck Flanges, Hastelloy G30 Blind Flanges, Alloy G30 Phosphoric Acid Flanges, Hastelloy G30 Sulfuric Acid Flanges, Alloy G30 HNO3-HF Flanges.

People Also Search For

hastelloy g30 flanges manufacturer, alloy g30 flanges supplier, uns n06030 flanges, hastelloy g30 phosphoric acid flanges price, alloy g30 vs c276 comparison, hastelloy g30 fertilizer industry flanges.

Looking for High-Quality Hastelloy G30 Flanges?

Let us support your projects with quality, precision, and performance.

Request a Quote Today

Frequently Asked Questions (FAQ)