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Gr 660A Flange Bolt
QS Fastener: Gr 660A Flange Bolt
Name: Gr 660A Flange Bolt
Material: Gr 660A
Size: M64
Length: 30 to 1000 mm
Standard: ANSI/ASTM
Product Grade: A
Tensile Strength(Rm): 895 N/mm²
Elongation: 25%
Feature: High performance superalloys
Application: For Oil Pipeline Flange
Material: Gr 660A
Size: M64
Length: 30 to 1000 mm
Standard: ANSI/ASTM
Product Grade: A
Tensile Strength(Rm): 895 N/mm²
Elongation: 25%
Feature: High performance superalloys
Application: For Oil Pipeline Flange
Quantity
Gr 660A Flange Bolt is a high-performance nickel alloy bolt made from Gr 660A material, compliant with ANSI/ASTM standards and classified as Grade A. With a size of M64 and lengths ranging from 30 to 1000 mm, it meets diverse installation needs. Featuring a high tensile strength of 895 N/mm² and an elongation rate of 25%, this bolt maintains exceptional mechanical performance even under extreme conditions, making it an ideal choice for flange connections in oil pipelines.
To produce qualified and high-quality Gr 660A Flange Bolt, we enforce strict requirements starting from the raw materials. Below is our inspection of the material's appearance.
Visual Inspection of Materials for Gr 660A Flange Bolts
Inspection Method
Visual inspection and appropriate measuring tools (such as calipers) are used to examine the materials of Gr 660A Flange Bolts.
Inspection Method
Visual inspection and appropriate measuring tools (such as calipers) are used to examine the materials of Gr 660A Flange Bolts.
Defect Criteria
Any obvious defects (such as rust, cracks, etc.) must be classified, recorded, and reported according to relevant standards.
Any obvious defects (such as rust, cracks, etc.) must be classified, recorded, and reported according to relevant standards.
Appearance Defect Criteria and Acceptance Range for Gr 660A Flange Bolts
Surface Defects
Cracks
Acceptance Range: Surface flaws such as minor scratches and surface cracks are acceptable. However, any visible cracks (length exceeding 0.5 mm or depth exceeding 0.1 mm) must be judged as unqualified.
Surface Defects
Cracks
Acceptance Range: Surface flaws such as minor scratches and surface cracks are acceptable. However, any visible cracks (length exceeding 0.5 mm or depth exceeding 0.1 mm) must be judged as unqualified.
Dents and Scratches
Acceptance Range: Slight dents and scratches with a diameter of less than 1 mm are generally acceptable. Larger or deeper dents (e.g., depth greater than 0.5 mm) should be judged as unqualified.
Acceptance Range: Slight dents and scratches with a diameter of less than 1 mm are generally acceptable. Larger or deeper dents (e.g., depth greater than 0.5 mm) should be judged as unqualified.
Dimensional Requirements
Length and Diameter Deviations
Acceptance Range: Dimensional tolerances should adhere to the following ranges:
Within manufacturing tolerance: ±0.5 mm
Dimensions exceeding the tolerance must be isolated and confirmed as unqualified.
Length and Diameter Deviations
Acceptance Range: Dimensional tolerances should adhere to the following ranges:
Within manufacturing tolerance: ±0.5 mm
Dimensions exceeding the tolerance must be isolated and confirmed as unqualified.
Welding Quality of Gr 660A Flange Bolts
Weld Defects
Acceptance Range: The weld surface should have no obvious porosity, slag inclusions, or defects. If visible defects (e.g., porosity with a diameter greater than 1 mm) are present, they must be judged as unqualified.
Weld Defects
Acceptance Range: The weld surface should have no obvious porosity, slag inclusions, or defects. If visible defects (e.g., porosity with a diameter greater than 1 mm) are present, they must be judged as unqualified.
Color Differences and Oxide Scale
Acceptance Range: Slight color differences and oxide scale are generally acceptable. If the oxide layer does not affect subsequent processes (such as welding or coating), it should be considered qualified. Any oxidation segregation that affects performance must be judged as unqualified.
Acceptance Range: Slight color differences and oxide scale are generally acceptable. If the oxide layer does not affect subsequent processes (such as welding or coating), it should be considered qualified. Any oxidation segregation that affects performance must be judged as unqualified.
Internal Defects of Gr 660A Flange Bolts (for NDT Inspection)
Ultrasonic Testing Defects
Acceptance Range: According to ASTM E317 or relevant standards, if more than two internal defects (such as cracks or inclusions) are detected, with each defect exceeding 3 mm in length, they must be judged as unqualified.
Ultrasonic Testing Defects
Acceptance Range: According to ASTM E317 or relevant standards, if more than two internal defects (such as cracks or inclusions) are detected, with each defect exceeding 3 mm in length, they must be judged as unqualified.
The specific defect criteria and acceptance ranges for Gr 660A Flange Bolts can be adjusted based on customer requirements and production processes. To ensure consistency across all standards, these should be clearly outlined in the material inspection plan for Gr 660A Flange Bolts and periodically reviewed and evaluated. In practical applications, enterprises can refer to relevant industry standards (such as ISO, ASTM) and customer requirements to establish defect criteria suitable for their products.
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