Hastelloy G-30 Extra-Thick Plate Hardness Standard

Introduction to Hastelloy G-30 Material

Hastelloy G-30 alloy is one of the few grades with a chromium content exceeding 30% in nickel-iron-chromium-molybdenum-copper alloys. Due to the composite effect of its composition, it exhibits extremely strong corrosion resistance in solutions such as H₂SO₄ and HNO₃. The alloy's excellent resistance to sensitization allows it to be used directly after welding in most chemical processing applications. Its primary applications include equipment and components for wet-process H₃PO₄ production and processing, as well as HNO₃ + HF pickling equipment and components.

Corrosion Resistance of Hastelloy G-30: It performs significantly better than G-3, Alloy 20, and Alloy 625 in resisting H₃PO₄, with a difference of 2–10 times. Its performance is not ideal in HCl acid but offers usable corrosion resistance in concentrated H₂SO₄ below 50°C. It demonstrates good corrosion resistance in HNO₃ and mixed acids.

Applications of Hastelloy G-30: As a high-chromium alloy, it exhibits excellent corrosion resistance in strongly acidic corrosive media containing F, Cl, and other oxidizing impurities. It is primarily used in wet-process H₃PO₄ production and processing, as well as HNO₃ + HF pickling equipment and components.

Chemical Composition of Hastelloy G-30:

C(%): ≤0.03

Si(%): ≤1.0

Mn(%): ≤2.0

Cr(%): 29.5

Ni(%): Balance

Mo(%): 5.0

Co(%): ≤5.0

W(%): 2.5

Al(%): --

Cu(%): 1.7

Ti(%): --

Fe(%): 15.0

Others(%): Nb/Ta 0.70

Available in various specifications including plates, bars, strips, wires, discs, ring blanks, and ring forgings. Bars are supplied in forged-rolled condition, surface polished or turned; discs and ring blanks are supplied in forged condition; rings are supplied in solution-treated condition; plates are supplied after solution treatment, alkaline pickling, straightening, and edge trimming; strips are delivered cold-rolled, solution-treated, and descaled; wires are supplied in solution-pickled coil or straight lengths, or solution-treated straight fine-polished condition.