Technical Standards for GH3030 High-Temperature Alloy Seamless Tubes for Nuclear Energy Industry
The technical standards for GH3030 high-temperature alloy seamless tubes in the nuclear energy field require strict adherence to material specifications, particularly regarding chemical composition and mechanical properties, and compliance with relevant standards such as ASME and RCC-M. Key requirements include excellent high-temperature strength, oxidation resistance, and thermal fatigue performance. Manufacturing standards cover precision dimensions, welding, and non-destructive testing to ensure the high reliability and safety required for critical nuclear applications.
What are the components of GH3030?
Composition: The main components are nickel, chromium, and iron. Properties: It exhibits high strength and good corrosion resistance over a wide temperature range.
GH3030 high-temperature alloy seamless tube is a nickel-based high-temperature alloy widely used in high-temperature environments such as aerospace, nuclear energy, and gas turbines. Its core advantages lie in its excellent corrosion resistance, high-temperature strength, and good mechanical properties. Product design adheres to multiple industry standards to ensure stable performance and reliable operation.
GH3030 - UNS GH30 / XH78T High Temperature Alloy Equivalent Grades
| CHINA STANDARD | WERKSTOFF NR. | UNS | GOST | AFNOR | JIS | BS | EN | OR |
| GH3030 | – | GH30 | ЭИ435 | – | – | – | – | – |
GH3030 - UNS GH30 / XH78T High Temperature Alloy Mechanical Properties
| Element | Yield Strength (0.2%Offset) | Melting Point | Density | Tensile Strength | Elongation |
| GH3030 | MPa – | 1420 °C | 8.4 g/cm3 | MPa – 785 | Min 35 % |
In terms of technical parameters, GH3030 seamless tubes cover a size range from outer diameter of 10 mm to 300 mm and wall thickness from 2 mm to 20 mm, meeting various installation requirements for different equipment. The chemical composition mainly contains more than 70% nickel, with the proportions of elements such as iron, chromium, molybdenum, and tungsten carefully adjusted to optimize its high-temperature stability. Performance-wise, it has a tensile strength of over 980 MPa, a yield strength of approximately 620 MPa, and an elongation after fracture of over 20%, enabling continuous operation at 1200°C. Regarding corrosion resistance, according to AMS 5659 standard, GH3030 must pass multiple corrosion resistance tests to ensure performance in high-temperature oxidizing and reducing atmospheres meets or exceeds industry requirements.
Regarding compliance with domestic and international standards, the production of GH3030 high-temperature alloy seamless tubes strictly adheres to both ASTM B163/AMS 5670 and the Chinese national standard (GB/T 14976-2013). The American industrial standard (ASTM B163) emphasizes stringent control over the chemical purity and mechanical properties of materials, meeting the stringent requirements of aerospace applications. The Chinese national standard (GB/T 14976-2013) focuses on the material's high-temperature resistance and dimensional accuracy. Combining the parameter settings of both standards ensures that the product can meet the needs of different application environments in both domestic and international markets.
There are also some misconceptions in the industry regarding the selection of GH3030 materials, which are worth mentioning. A common mistake is blindly pursuing high-temperature strength while neglecting resistance to stress corrosion cracking, especially in complex atmospheres, which can lead to usage risks. Another misconception is focusing solely on price while ignoring the material's oxidation resistance, especially in ultra-high temperature environments, which can lead to premature material failure. A third misconception is neglecting the compatibility of processing technologies during material selection; welding and heat treatment processes that have not been adequately evaluated may weaken the overall performance of the material. Regarding the technical points of contention, there is currently debate within the industry about the heat treatment process for GH3030 seamless steel tubes. The standard recommends a solution treatment followed by aging (e.g., solution treatment at 1050°C, aging at 620°C) to improve high-temperature strength and oxidation resistance. However, some manufacturers advocate for direct heat treatment, which may affect the microstructural stability of the material, thus impacting its performance under extreme conditions.
Why Choose Gnee Nickel Alloy (Supplier Example)?
✅ Large stock of GH 3030 stainless steel strip/coil available for fast shipping.
✅ Factory direct sales, highly competitive prices, excellent value for money.
✅ Comprehensive quality assurance: Material Testing Certificate (MTC), Chemical Composition Certificate, and Mechanical Properties Certificate.
✅ Value-added services: Slitting, Cutting, Polishing, Surface Treatment.
✅ Worldwide shipping, secure and reliable packaging, and provision of export documentation.
Email: ss@gneemetal.com
Gnee Steel is a professional manufacturer of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel Alloy 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy Alloy 800, Incoloy 800H/HT, Incoloy 825, Monel Alloy 400, Monel K500, and high-temperature alloys. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power, automotive, and nuclear energy industries, and we can provide customized alloy material solutions according to customer needs. For alloy material price inquiries or to request customized alloy material solutions, please feel free to contact us at ss@gneemetal.com for a quote.
