GH4698高温合金

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Product information

Grade: GH4698
Steel Manufacturer: Haynes; SMC; ATI; VDM; Outokumpu; NYK; Jinri Tiefu, Fushun / Northeast Special Steel
GH4698 (GH698) is a precipitation-hardening deformation superalloy based on nickel, featuring excellent high-temperature strength, creep resistance, and oxidation resistance. It is suitable for use in high-temperature environments ranging from 750 to 800 degrees Celsius. 
High-temperature properties
Within the range of 550 to 800 degrees Celsius, this alloy exhibits high endurance strength and tensile strength, making it particularly suitable for manufacturing components such as turbine discs and compressor discs that endure high stress over a long period. Its creep resistance is attributed to the precipitation strengthening of γ′ phase and the grain boundary pinning effect of carbides, maintaining its microstructure stability even after long-term aging. 
Mechanical properties
Strength: Maintains high yield strength and tensile strength at 650 degrees Celsius, capable of withstanding complex stress environments. 
Plasticity: Exhibits good plasticity, facilitating the fabrication of complex-shaped components. 
Creep resistance: Through two-stage aging treatment, γ′ phase can be refined, significantly enhancing the creep resistance at high temperatures. 
Antioxidation and corrosion resistance
Contains elements such as nickel, chromium, and molybdenum, forming a stable oxide layer protective structure, with outstanding resistance to high-temperature oxidation and pitting corrosion, suitable for corrosive environments such as those in the petrochemical industry. 
Processing and heat treatment
Prepared using vacuum induction melting + arc remelting technology. The hot processing temperature range is 1160-1000 degrees Celsius. Common heat treatments include solution treatment (1110-1130 degrees Celsius) + aging treatment (990-1010 degrees Celsius), and special processes can optimize the distribution of γ′ phase.

Product parameter

Chemical composition 
GH4698 is a nickel-chromium-based nickel-copper superalloy with nickel (Ni) as the matrix, and elements such as aluminum (Al), titanium (Ti), molybdenum (Mo), and niobium (Nb) added. Its chemical properties are mainly reflected in high-temperature strength, oxidation resistance, and corrosion resistance. 
Core chemical composition
Main components are:
‌Ni (remainder): Provides high-temperature strength and toughness
‌Cr (13-16%): Enhances oxidation resistance and corrosion resistance
‌Al (2.5-3.2%) and Ti (2.5-3.2%): Form γ' phase strengthening phase to enhance high-temperature strength
‌Mo (5-7%): Improves thermal stability and creep resistance
‌Nb (1.0-1.5%): Further optimizes high-temperature strength and creep resistance
High-temperature mechanical properties
At 750℃/300MPa, the endurance strength can reach more than 300 hours; the short-term tensile strength at 800℃ is ≥ 850MPa, and the creep second-order rate is ≤ 1×10⁻⁷ s⁻¹. 
Oxidation resistance and corrosion resistance
The oxide growth rate at 750℃ ≤ 0.03mm/100h (Cr₂O₃-Al₂O₃ composite oxide layer protection), and the sulfide corrosion resistance rate < 0.04mm/a @ 600℃.

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COMPANY PROFILE




Shiyu Metal Material Technology Co., Ltd. is a collection of procurement, processing, agent, sales, logistics, warehousing in one of the enterprises, the company has a large-scale spot supply base in China, with domestic and foreign large steel mills and suppliers to maintain good relations of cooperation, with a full range of multi-channel procurement resources.
Shiyu Metal main products: nickel base alloy, Hastelloy, super austenitic stainless steel, duplex stainless steel, cobalt base alloy, pure nickel, titanium and titanium alloy, heat resistant, corrosion resistant alloy and other kinds of steel, a large number of product categories, can meet the size and thickness customization, prefabrication and other diversified needs.
The company has ISO9001 quality certification, the company's product standards include: the United States (UNS) ASTM /ASME, AMS, German DIN/EN, Japan (SUS) JIS and other standards supply, provide the original material certificate. We can supply according to the standards and technical requirements provided by customers to ensure that the goods and specifications are complete to meet the needs of various merchants. From raw materials to finished products, all go through three quality inspection to ensure the qualified rate of finished products. Shiyu Metal strives for perfection in every detail to ensure that the quality of products in different countries and regions around the world can meet international standards. Shiyu Metal has established a good strategic cooperative relationship with the world famous steel mills such as HAYNES, ATI, SPECIALMETALS, VDM, OUTOKUMPU, Japan Metallurgy, Nippon Steel, and Datong Special Steel.
The products supplied by Shiyu Metal are widely used in nuclear power, petrochemical, mechanical engineering, precision processing, aerospace, electronic instruments, medical equipment, automobile manufacturing, environmental protection, wind power application, seawater desalination, shipbuilding industry, paper making machinery, mining engineering, cement manufacturing, metallurgical manufacturing, corrosion resistant environment field, high temperature environment field, mold field, etc. It is a global high-quality supplier of special steel materials.
Shiyu Metal Material Technology Co., Ltd. is committed to the purchase, agent and sales of special steel, and has a perfect special steel sales management system and product quality supervision system. The company has been adhering to the "integrity, innovation, responsibility, win-win" business philosophy, adhere to the "quality first, customer first" service purpose, to provide customers with quality services and high-quality steel products. Shiyu Metal actively participates in the development of domestic steel industry ecology, and is willing to contribute to the development of national special steel.



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SERVICE

From steel procurement, processing, logistics, warehousing, 
Shiyu Metal has a perfect management system, tailor-made solutions for each customer, strictly control each link, to ensure safe, efficient and accurate product delivery to customers;




RESOURCE

Shiyu Metal maintains good cooperative relations with medium and large steel mills and suppliers at home and abroad, 

and has established good strategic cooperative relations with world famous steel mills such as the United States, Germany, Finland and Jap.




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Shiyu Metal set procurement, processing, agency, sales, logistics, 

warehousing in one, can provide customers with steel products procurement, processing, logistics and other one-stop services.




PRODUCT

Shiyu Metal operates a wide range of steel products, can provide customers with product size and width customization, prefabrication and other services, perfect product quality supervision system, to ensure high standards of product quality, high quality.