EN 2030:2013

Overview

EN 2030:2013 is a European standard developed by CEN that specifies the technical requirements for Steel X105CrMo17 (1.3544) bars intended for aerospace applications. These bars are hardened and tempered, with diameters (De) up to 150 mm. Also known under designations such as UNS S44004 and AISI 440C, this steel grade is renowned for its high hardness, corrosion resistance, and wear properties-making it ideal for critical aerospace components.

This standard is part of the aerospace metallic materials series, designed to ensure consistent quality and performance of steel used in aerospace structural and mechanical parts like bearings and precision components.

Key Topics

• Material Specifications
  Steel X105CrMo17 is characterized by a carbon content between 0.95% and 1.10%, chromium content between 16% and 18%, with minor amounts of molybdenum, silicon, manganese, and nickel. The steel is air melted and delivered in softened condition before undergoing hardened and tempered heat treatment.

• Heat Treatment Requirements
  Hardened and tempered condition involves heating between 1,030 °C and 1,070 °C followed by oil quenching to sub-zero temperatures (-70 °C to -90 °C) and tempering at 140 °C or higher. This treatment ensures optimal mechanical properties and microstructure.

• Mechanical and Physical Properties
  The standard specifies hardness requirements with a minimum hardness of 650 HV (~58 HRC), proof stress, tensile strength, elongation, reduction of area, and microstructure quality, ensuring high strength and durability tailored for aerospace demands.

• Quality and Inspection Procedures
  EN 2030 mandates rigorous testing methods including ultrasonic inspection for internal defects, micrographic determination of non-metallic inclusions, visual inspection, and dimensional checks. It adopts related standards such as EN 2951 (inclusion content) and EN 4050-4 (ultrasonic inspection).

• Dimensional Scope
  Applicable to bars with external diameters up to 150 mm, the standard includes specific guidelines for dimensional tolerances and delivery conditions suitable for aerospace manufacturing workflows.

Applications

EN 2030:2013 steel bars are primarily used in the aerospace sector where high-performance steel with exceptional wear resistance, hardness, and toughness is critical. Typical applications include:

• Bearings and bearing components in aircraft engines and landing gear
• Structural bars and mechanical components requiring high fatigue resistance
• Aerospace parts subjected to cyclic or stress-intensive environments
• Precision machining elements benefiting from fine carbide microstructure and consistent hardness

The steel grade X105CrMo17 is favored in these applications due to its ability to maintain mechanical integrity under extreme operating conditions and its resistance to corrosion and wear.

Related Standards

EN 2030:2013 is part of a series of aerospace standards governing metallic materials. Important related standards include:

• EN 4700-002 – Steel and heat resisting alloys; technical specifications for bars and sections
• EN 4258 – General organization of aerospace metallic material standardization
• EN 2951 – Micrographic determination of non-metallic inclusions in aerospace materials
• EN 4050-4 – Ultrasonic inspection of bars and forgings in aerospace series
• EN ISO 643 – Micrographic determination of apparent grain size in steels

These standards collectively ensure that materials used in aerospace applications meet stringent quality, reliability, and safety criteria essential for the industry.

By adhering to EN 2030:2013, manufacturers and users in the aerospace sector can guarantee they work with high-quality hardened and tempered steel bars that conform to internationally recognized benchmarks, facilitating safety, performance, and interoperability in aerospace manufacturing.