1.What are the execution standards for G35 Hastelloy?
ASTM Standards:
ASTM B582: Applicable to medium - thick plates, thin plates and strips of G35 Hastelloy.
ASTM B622: Specifies the technical requirements for seamless nickel - based alloy pipes, including the chemical composition limits, tensile properties (tensile strength, yield strength, elongation) and non - destructive testing (such as eddy current testing, hydrostatic testing) requirements of G35 Hastelloy pipes.
ASTM B619: For seamless nickel - based alloy forgings, it regulates the forging process, solution annealing parameters (such as heating temperature, holding time, cooling method) and mechanical property verification methods of G35 Hastelloy forgings.
ASTM B626: It is used to standardize the plates and thin plates of nickel - based alloys, and makes specific provisions on the thickness tolerance, flatness, chemical composition analysis method and hardness test of G35 Hastelloy plates.
ASTM B366: Applies to pipe fittings of G35 Hastelloy.
ASTM B574: Specifies the requirements for rods and wires of G35 Hastelloy.
ASME Standard: ASME BPVC Section II, Part A adopts the relevant technical requirements of ASTM standards (such as ASTM B622, B619) for G35 Hastelloy, which is applicable to materials for pressure - bearing equipment to ensure that they meet the safety performance standards of boilers and pressure vessels.
Other Standards: G35 Hastelloy also meets the requirements of AMS 5936 and NACE MR0175 standards. In addition, its equivalent grade in DIN/EN is 2.4643.
2.What is the equivalent substitute for G35 Hastelloy?
Hastelloy G30® (UNS N06030): It is a predecessor alloy of G35 in the same series. Both belong to nickel - chromium - molybdenum - copper alloys. The chromium content of G30 (28% - 31%) is close to that of G35, and its corrosion resistance to oxidizing acids (such as sulfuric acid, phosphoric acid) and pitting resistance are quite similar. Its mechanical properties (room - temperature tensile strength is about 700 MPa, yield strength is about 300 MPa) match those of G35, and it can replace G35 in most chemical and oil - and - gas scenarios.
Inconel 625® (UNS N06625): It is a nickel - chromium - molybdenum alloy containing niobium (Nb). Its corrosion resistance in seawater and acidic solutions is equivalent to that of G35, and its high - temperature strength (tensile strength is about 550 MPa at 600°C) is better. It is suitable for scenarios that require both corrosion resistance and high - temperature mechanical properties, and can replace G35 in marine engineering, high - temperature chemical equipment and other fields.
Hastelloy G3® (UNS N06003): Although it is an early model of the G - series, after adjusting the composition (such as increasing the molybdenum content), its corrosion resistance to reducing acids and chlorides is close to that of G35. In medium - low temperature and low - concentration corrosion environments, G3 can be used as an economical substitute for G35. However, in high - temperature and high - concentration mixed - acid environments, G35 has more obvious corrosion resistance advantages.
