SIST EN 4262:2014

Overview

SIST EN 4262:2014 is a European Standard that establishes the requirements for heat resisting alloy FE-PA4901 (X12CrNiCoMoW21-20), in the as-forged condition, intended for use as forging stock with a maximum cross-section dimension (a or D) of up to 200 mm. The standard specifically covers aerospace applications where high mechanical strength and resistance to elevated temperatures are required, stipulating an ultimate tensile strength (Rm) range from 690 MPa to 880 MPa. Developed in alignment with the EN metallic material standards, this document ensures consistency and quality across aerospace manufacturing processes involving ferrous alloy forging stock.

Key Topics

• Material Specification
  SIST EN 4262:2014 details the chemical composition and primary properties of the FE-PA4901 alloy, notable for its heat resistance and mechanical performance at high temperatures.
• Forging Stock Requirements
  The standard defines dimensional and delivery conditions for stock in the as-forged state, including requirements for mechanical properties, heat treatment, and product qualification.
• Mechanical Properties
  Critical requirements include:
  • Ultimate tensile strength (Rm) between 690 MPa and 880 MPa
  • Minimum proof stress (Rp0,2) of 305 MPa
  • Minimum elongation (A) of 35%
  • Maximum hardness of 229 HB
• Quality and Testing
  The document references methods for sampling, testing directions, and acceptable internal and external defect levels as defined in related standards such as EN 2860-2.
• Qualification and Traceability
  Product qualification protocols, marking inspection, and dimensional inspection are aligned with EN 2043 and EN 2860-2, ensuring traceability and compliance throughout the supply chain.

Applications

SIST EN 4262:2014 is an essential standard for the aerospace industry, where reliable materials with strong heat-resisting and mechanical properties are crucial for both safety and performance. Typical applications include:

• Forging stock for aircraft engine components
  Used in parts that experience high stress and temperatures, such as turbine disks, compressor parts, and structural components.
• Critical aerospace structures
  Suitable for elements that demand high tensile strength and resistance to thermal fatigue.
• Other high-performance sectors
  The alloy’s properties make it suitable for use in sectors such as defense, power generation, and heavy-duty industrial machinery requiring similar heat and mechanical resistance.

Implementing this standard ensures compatibility, high material quality, and reliability across diverse aerospace engineering applications.

Related Standards

For a comprehensive approach to materials selection and qualification in aerospace, consider the following related European standards:

• EN 2043: Aerospace series - Metallic materials - General requirements for semi-finished product qualification (excluding forgings and castings)
• EN 2860-2: Aerospace series - Heat resisting alloys - Forging stock and forgings - Technical specification - Part 2: Forging stock
• EN 4258: Aerospace series - Metallic materials - General organization of standardization - Links between types of EN standards and their use
• EN 4500-003: Aerospace series - Metallic materials - Rules for drafting material standards - Part 003: Specific rules for heat resisting alloys

Staying updated and compliant with these standards will ensure best practices in aerospace metallurgy, fostering safety and efficiency in design and production.

Keywords: SIST EN 4262:2014, heat resisting alloy FE-PA4901, X12CrNiCoMoW21-20, aerospace forging stock standard, mechanical properties, high temperature alloy, European standard, aircraft material requirements, EN 4262