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Quanzhou Gr.660 Double End Stud
QS Fastener: Quanzhou Gr.660 Double End Stud
Name: Quanzhou Gr.660 Double End Stud
Material: A453 Gr.660
Standard: ASNI B18.31.1M
Size: M8 to M100
Length: 30 to 1000 mm
Class: A, B, C, D
Feature: High Yield Strength and Durable Strength
Material: A453 Gr.660
Standard: ASNI B18.31.1M
Size: M8 to M100
Length: 30 to 1000 mm
Class: A, B, C, D
Feature: High Yield Strength and Durable Strength
Quantity
The Gr.660 Double End Stud is manufactured from A453 Gr.660 high-temperature alloy and strictly complies with the ASME B18.31.1M standard. This material offers excellent high-temperature yield strength and creep rupture strength. The studs are available in a full range of specifications from M8 to M100, with lengths ranging from 30 to 1000 mm. They are particularly suitable for flange bolted connections in critical applications such as petrochemical high-temperature and high-pressure vessels, power station boilers, and gas turbines, ensuring no relaxation under thermal cycling.
Material Properties and Standards
A453 Gr.660 is the most critical high-temperature bolting material grade under the ASTM A453 standard. Its base material is A-286 (UNS S66286), an iron-nickel-chromium-based precipitation-hardening alloy (X6NiCrTiMoVB25-15-2). It is specifically designed for critical fastening applications involving high temperature and high pressure where leakage due to thermal expansion must be prevented. Its core characteristics are as follows:
A453 Gr.660 is the most critical high-temperature bolting material grade under the ASTM A453 standard. Its base material is A-286 (UNS S66286), an iron-nickel-chromium-based precipitation-hardening alloy (X6NiCrTiMoVB25-15-2). It is specifically designed for critical fastening applications involving high temperature and high pressure where leakage due to thermal expansion must be prevented. Its core characteristics are as follows:
Primary Applications
It maintains high strength and anti-relaxation performance at temperatures up to 650°C. It is commonly used in high-temperature bolted connections in power generation (steam turbines, gas turbines), petrochemicals (refineries, heat exchangers, pressure vessels), and aerospace industries.
It maintains high strength and anti-relaxation performance at temperatures up to 650°C. It is commonly used in high-temperature bolted connections in power generation (steam turbines, gas turbines), petrochemicals (refineries, heat exchangers, pressure vessels), and aerospace industries.
Core Advantages
- Thermal Expansion Matching: The coefficient of thermal expansion of this Gr.660 Double End Stud (approximately 16.0 x 10⁻⁶/°C) is very close to that of austenitic stainless steel flanges (e.g., 304/316, approximately 17.0 x 10⁻⁶/°C). If ordinary alloy steel bolts (e.g., B7) are used, the flange expands faster than the bolt upon heating, which can easily lead to bolt relaxation and leakage.
- High-Temperature Resistance: It can operate continuously in environments up to 650°C.
- Thermal Expansion Matching: The coefficient of thermal expansion of this Gr.660 Double End Stud (approximately 16.0 x 10⁻⁶/°C) is very close to that of austenitic stainless steel flanges (e.g., 304/316, approximately 17.0 x 10⁻⁶/°C). If ordinary alloy steel bolts (e.g., B7) are used, the flange expands faster than the bolt upon heating, which can easily lead to bolt relaxation and leakage.
- High-Temperature Resistance: It can operate continuously in environments up to 650°C.
Technical Parameters
- Material Composition: Contains approximately 25% Ni, 15% Cr, 1.25% Mo, and elements such as Ti and Al, achieving high strength through precipitation-hardening heat treatment.
- Strength Grades: Includes multiple classes such as A, B, C, and D. The common Class A requires a minimum tensile strength of 130 ksi (896 MPa) and a minimum yield strength of 85 ksi (586 MPa).
- Material Composition: Contains approximately 25% Ni, 15% Cr, 1.25% Mo, and elements such as Ti and Al, achieving high strength through precipitation-hardening heat treatment.
- Strength Grades: Includes multiple classes such as A, B, C, and D. The common Class A requires a minimum tensile strength of 130 ksi (896 MPa) and a minimum yield strength of 85 ksi (586 MPa).
Naming Rules and Procurement Instructions
"A453"is the standard number, and"Gr.660"is the material designation. When procuring the Gr.660 Double End Stud, the Class (e.g., A453 Gr.660 Class A) is typically also specified.
"A453"is the standard number, and"Gr.660"is the material designation. When procuring the Gr.660 Double End Stud, the Class (e.g., A453 Gr.660 Class A) is typically also specified.
Application Fields
As a high-end high-temperature fastening solution, the Gr.660 Double End Stud is widely used in industrial fields requiring exceptional high-temperature performance, such as petrochemical high-temperature and high-pressure vessels, power station boilers, and gas turbines. It is the preferred fastener product for critical flange connections, ensuring no relaxation under severe thermal cycling conditions.
As a high-end high-temperature fastening solution, the Gr.660 Double End Stud is widely used in industrial fields requiring exceptional high-temperature performance, such as petrochemical high-temperature and high-pressure vessels, power station boilers, and gas turbines. It is the preferred fastener product for critical flange connections, ensuring no relaxation under severe thermal cycling conditions.
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