What are standards for GH2132 Superalloy - Knowledge

What are the execution standards for GH2132 Superalloy?

1. Core Execution Standards

The standards for GH2132 cover different product forms (bars, sheets, wires) and are divided into national standards and aviation industry standards to meet the needs of civilian and high-end aviation fields respectively.

GB/T 14992-2005: Nickel-based and cobalt-based superalloys

As the fundamental national standard for superalloys in China, it defines the basic requirements for GH2132, including chemical composition range, room-temperature/high-temperature mechanical properties, and general heat treatment processes.HB 5282-2005: Aviation industry standard for nickel-based superalloy bars

This standard targets GH2132 bars used in aviation. It adds stricter requirements on dimensional accuracy (e.g., diameter tolerance ≤ ±0.05mm), surface finish (no cracks or scratches), and high-temperature creep performance (creep rupture time at 650°C/620MPa ≥ 100 hours) compared to national standards.HB 5283-2005: Aviation industry standard for nickel-based superalloy sheets and strips

For GH2132 sheets/strips, it specifies thickness tolerance (≤ ±0.03mm for thin sheets), flatness (≤ 2mm/m), and fatigue strength (10⁷ cycles at 600°C ≥ 300MPa) to adapt to the high reliability requirements of aviation structural parts.GB/T 14994-2008: Superalloy hot-rolled bars

This standard focuses on the hot-rolling process of GH2132 bars, regulating heating temperature (1120–1160°C), rolling speed, and cooling method to ensure the uniformity of the alloy's internal structure.

2. Key Technical Requirements in Standards

The standards clarify three core technical indicators to ensure the stable high-temperature performance of GH2132.

Chemical Composition

The content of key elements is strictly limited to ensure the alloy's precipitation hardening effect and corrosion resistance.

Nickel (Ni): 24.0%–27.0% (forms austenite matrix and promotes precipitation of strengthening phases)

Chromium (Cr): 13.5%–16.5% (improves high-temperature oxidation and corrosion resistance)

Titanium (Ti): 1.75%–2.35% (forms TiC and γ' phase [Ni₃Ti] to enhance strength)

Aluminum (Al): 0.10%–0.50% (协同 Ti to optimize the distribution of γ' phase)

Impurities (P, S, Pb) are strictly controlled (e.g., S ≤ 0.015%, Pb ≤ 0.001%) to avoid brittle fracture.

Mechanical Properties

Requirements cover room-temperature, high-temperature (600–700°C) and creep properties, with typical indicators as follows:

Room temperature: Tensile strength ≥ 930 MPa, yield strength ≥ 680 MPa, elongation ≥ 15%

At 650°C: Tensile strength ≥ 700 MPa, yield strength ≥ 480 MPa, elongation ≥ 12%

Creep performance: At 650°C/620MPa, creep rupture time ≥ 100 hours; at 700°C/490MPa, creep rupture time ≥ 50 hours

Heat Treatment Process

The standard specifies a three-stage heat treatment to maximize the alloy's strength through precipitation hardening.

Solution annealing: Heat to 980–1000°C, hold for 1–2 hours, then water-cool.

Intermediate aging: Heat to 760–780°C, hold for 10–12 hours, then air-cool.

Final aging: Heat to 650–670°C, hold for 15–20 hours, then air-cool.

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What is the equivalent substitute for GH2132 Superalloy?

GH2132 is the Chinese designation of the Fe-Ni-Cr-Ti precipitation-hardening superalloy. Its international equivalents have almost the same chemical composition and performance, and can be directly substituted in most application scenarios. The main differences lie in the impurity limits and standard system requirements.

1. Direct Equivalent Alloys

These alloys are homologous to GH2132, with the same design concept and core performance, and are recognized as direct substitutes globally.

Alloy Grade	Country/Region	Corresponding Standard	Similarity with GH2132
A-286	United States	ASTM A286 / ASME SA-286	The most classic equivalent of GH2132. The chemical composition is almost identical (Ni: 24–27%, Cr: 13.5–16.5%), and the mechanical properties and heat treatment process are completely consistent. It is the first choice for substitution in international trade.
X5NiCrTi26-15	European Union	EN 10095 / DIN 17756	The European standard equivalent of A-286. The content of Ti and Al is slightly adjusted (Ti: 1.9–2.3%), but the high-temperature strength and creep performance are the same as GH2132.
Nimonic 80A	United Kingdom	BS HR 502 / EN 10095	A nickel-based alloy with slightly higher Ni content (30–35%) than GH2132. Its high-temperature stability (up to 750°C) is better, but the room-temperature strength is similar, and it can be used as a direct substitute in high-temperature scenarios.
SUH660	Japan	JIS G4902	The Japanese equivalent of A-286. It strictly follows the ASTM standard, and the performance indicators are completely aligned with GH2132. It is widely used in Japanese-made industrial equipment.

2. Alternative Alloys (Similar Performance)

These alloys have different component systems but similar high-temperature performance, and can be substituted in specific scenarios (e.g., low-load, short-term high-temperature environments).

Inconel 718 (USA): A nickel-based superalloy with higher Mo and Nb content. Its high-temperature strength (up to 750°C) is better than GH2132, but the cost is 30–50% higher. It is suitable for substitution in high-load key components.

GH4169 (China): The domestic equivalent of Inconel 718. It has better creep resistance than GH2132 at 700–750°C, but the processing difficulty is higher. It can be used as a substitute when higher temperature resistance is required.

Haynes 282 (USA): A new generation of precipitation-hardening superalloy. Its service temperature (up to 800°C) is significantly higher than GH2132, but the price is high. It is only used as a substitute in special high-temperature fields (e.g., advanced aerospace engines).

3. Notes on Substitution

Standard Matching: When substituting, it is necessary to confirm whether the application field accepts the corresponding standard of the substitute alloy. For example, A-286 follows ASTM standards, while GH2132 follows Chinese GB standards. For aviation products, the material certification of the substitute alloy must be re-verified.

Processing Adaptability: A-286 and SUH660 have the same hot/cold processing performance as GH2132, and no additional adjustment to the processing process is required. However, Inconel 718 and GH4169 have higher hardness, so the cutting parameters need to be optimized.

Cost Control: A-286 and SUH660 are 10–20% more expensive than GH2132. For civilian products (e.g., industrial furnace brackets), domestic GH2132 is more cost-effective; for export products, A-286 or SUH660 can be selected to meet international standard requirements.