AMS 4902: Aerospace Material Specifications for Titanium Sheet Alloys

AMS 4902 is an aerospace material specification developed by SAE International (previously known as the Society of Automotive Engineers) for titanium sheet, strip, and plate products. This specification outlines the requirements for titanium alloy sheets used in aerospace applications. Here's an overview of the key aspects covered by AMS 4902:

1. Material Composition:

1. Alloy Composition:
   • AMS 4902 specifies the chemical composition requirements for titanium alloy sheet products, including the allowable limits for various alloying elements such as aluminum, vanadium, and other trace impurities.
   • The composition requirements ensure that the material meets the desired properties for aerospace applications, such as strength, fatigue resistance, and corrosion resistance.

2. Mechanical Properties:

1. Mechanical Strength:
   • The standard defines the mechanical properties of titanium alloy sheet products, including tensile strength, yield strength, elongation, and hardness.
   • These properties are determined through mechanical testing conducted according to specified procedures and standards to ensure compliance with the requirements for each grade of titanium alloy.

3. Heat Treatment:

1. Heat Treatment Requirements:
   • AMS 4902 may include requirements for heat treatment processes applied to titanium alloy sheet products to achieve the desired mechanical properties and microstructure.
   • Heat treatment processes such as solution treatment, stabilization, and aging may be specified to improve the material's strength, ductility, and fatigue resistance.

4. Dimensions and Tolerances:

1. Thickness, Width, and Length:
   • The standard specifies the permissible dimensions for titanium alloy sheet products, including thickness, width, and length.
   • It also defines the allowable tolerances for dimensions to ensure that the sheet products meet the specified requirements and are suitable for aerospace applications.

5. Surface Finish and Condition:

1. Surface Finish:
   • AMS 4902 may include requirements for the surface finish of titanium alloy sheet products, specifying acceptable levels of roughness or smoothness.
   • Surface finish requirements ensure that the sheets meet the desired aesthetic and functional standards for their intended aerospace applications.

6. Testing and Inspection:

1. Quality Control Testing:
   • The standard outlines the testing procedures and methods for evaluating the quality and properties of titanium alloy sheet products.
   • Testing may include chemical analysis, mechanical testing, non-destructive testing, visual inspection, and dimensional inspection to ensure compliance with the specified requirements.

7. Marking and Identification:

1. Product Marking:
   • Titanium alloy sheet products manufactured in accordance with AMS 4902 must be marked with specific information, including the material grade, dimensions, heat number, manufacturer's name or trademark, and any applicable AMS designation.
   • Proper marking ensures traceability and identification of the product, facilitating quality control, documentation, and compliance verification.

Compliance and Certification:

1. Certification:

   • Manufacturers of titanium alloy sheet products typically provide certification documents indicating compliance with AMS 4902 requirements.
   • These documents may include material test reports (MTRs) containing detailed information on chemical composition, mechanical properties, heat treatment, testing results, and compliance with AMS standards.

2. Conformance to Standards:

   • Titanium alloy sheet products that meet the requirements of AMS 4902 are considered to conform to industry standards for quality, performance, and safety in aerospace applications.
   • Compliance with AMS specifications ensures that the titanium alloy sheet products meet the stringent requirements for aerospace materials, contributing to the reliability and performance of aerospace systems and components.

In summary, AMS 4902 establishes the aerospace material specifications for titanium alloy sheet products, ensuring consistency, quality, and compliance with industry standards. Manufacturers, suppliers, and users of titanium alloy sheet products rely on this specification to produce, specify, and verify the properties and quality of materials used in aerospace applications.

Ms. Vivian (王宁宁)project manager
Shaanxi Qianyi Tuoda Technology Co., Ltd
Email:qy002@sxqytd.com www.sxqytd.com
Phone: +8618829679311
Address: Baoji City, Shaanxi Province, China

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