SIST EN 4642:2009

• Abstract:

  This standard specifies the requirements relating to:; Steel FE-PM 3504 (X4CrNiMo16-5-1); Air melted; Hardened and tempered; Sheet and plate; 0,6 mm < or = a < or = 50 mm; 900 MPa < or = Rm < or = 1 050 MPa; for aerospace applications.

• Status: Published
• Publication Date: 30-Mar-2009
• ICS: 49.025.10 - Steels
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 19-Mar-2009
• Due Date: 24-May-2009
• Completion Date: 31-Mar-2009
• Ref Project: EN 4642:2009 - Aerospace series - Steel FE-PM 3504 (X4CrNiMo16-5-1) - Air melted - Hardened and tempered - Sheet and plate - 0,6 mm ≤ a ≤ 50 mm - 900 MPa ≤ Rm ≤ 1 050 MPa

• Refers: SIST EN 4700-002:2026 - Aerospace series - Steel and heat-resisting alloys - Wrought products - Technical specification - Part 002: Bars and sections
• Effective Date: 28-Jan-2026
• Refers: SIST EN 4700-001:2025 - Aerospace series - Steel and heat-resisting alloys - Wrought products - Technical specification - Part 001: Plates, sheets and strips
• Effective Date: 28-Jan-2026
• Refers: SIST EN 4258:2024 - Aerospace series - Metallic materials - General organization of standardization - Link between types of European Standards and their use
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 4632-004:2014 - Aerospace series - Weldability and brazeability of materials in aerospace constructions - Part 004: Welding and brazing of homogeneous assemblies of high alloyed steels
• Effective Date: 28-Jan-2026

Overview

EN 4642:2009 is a CEN aerospace material standard that specifies requirements for steel FE‑PM 3504 (X4CrNiMo16‑5‑1) in sheet and plate form. It covers air‑melted, hardened and tempered material with thicknesses from 0.6 mm to 50 mm and a specified tensile strength range 900 MPa ≤ Rm ≤ 1 050 MPa. The standard defines chemical composition limits, melting and heat‑treatment routes, mechanical properties, microstructure and inspection criteria for aerospace use.

Key topics and requirements

• Material designation: FE‑PM 3504 (X4CrNiMo16‑5‑1).
• Chemical composition (typical limits): C 0.02–0.06 %, Si ≤0.70 %, Mn ≤1.50 %, P ≤0.030 %, S ≤0.005 %, N ≤0.08 %, Cr 15.00–17.00 %, Mo 0.80–1.50 %, Ni 4.00–6.00 % (Fe balance).
• Melting and production: Air melted, with possible AOD or VOD or equivalent secondary refining; rolled into sheet and plate.
• Heat treatment / delivery conditions: Softened and hardened & tempered. Typical austenitizing 1010 °C – 1060 °C and tempering 580 °C – 650 °C, or by agreement between manufacturer and purchaser.
• Mechanical properties: Proof stress Rp0.2 ≥ 700 MPa (for relevant thicknesses) and tensile strength 900–1 050 MPa. Hardness in the tempered condition typically ~280–320 HV (per table values).
• Toughness & testing: Impact energy requirements and test directions vary with thickness; testing, micrographic inclusion assessment and ultrasonic inspection are required per referenced aerospace test methods.
• Microstructure & cleanliness: δ‑ferrite ≤ 5 %, grain size G ≥ 5 or finer, micro‑cleanness per EN 2951 category 2.
• Inspection & qualification: Dimensional and marking inspections per EN 4700‑2; product qualification program per EN 2043; internal defect acceptance per EN 4050‑4 (class 3 criteria).

Practical applications and users

• Who uses EN 4642:2009: Aerospace OEMs, tier‑1 manufacturers, materials engineers, procurement/specification teams, heat‑treatment shops, and certification bodies specifying high‑strength stainless steels for airframe and structural components.
• Typical applications: Structural sheet and plate components where a high‑strength, corrosion‑resistant, hardened and tempered stainless steel is required (e.g., landing gear components, secondary structure, highly loaded brackets), subject to contractual agreement and further design validation.
• Benefits: Provides harmonized chemical, mechanical and inspection requirements for consistent material performance, traceability and easier cross‑border procurement within CEN member states.

Related standards

• EN 4700‑1 / EN 4700‑2 (steel technical specifications; plate, sheet, strip; marking)
• EN 4258 (organization of aerospace metallic material standards)
• EN 2951 (inclusion assessment)
• EN 4050‑4 (ultrasonic inspection criteria)
• EN 2043 (semi‑finished product qualification)
• EN 4500‑5 (rules for drafting steel material standards)

Keywords: EN 4642:2009, FE‑PM 3504, X4CrNiMo16‑5‑1, aerospace steel, hardened and tempered, sheet and plate, 900–1050 MPa, CEN.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.03D49.025.10JeklaSteelsICS:Ta slovenski standard je istoveten z:EN 4642:2009SIST EN 4642:2009en01-maj-2009SIST EN 4642:2009SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4642
February 2009 ICS 49.025.10 English Version
Aerospace series - Steel FE-PM 3504 (X4CrNiMo16-5-1) - Air melted - Hardened and tempered - Sheet and plate - 0,6 mm ≤ a ≤ 50 mm - 900 MPa ≤ Rm ≤ 1 050 MPa
Série aérospatiale - Acier FE-PM 3504 (X4CrNiMo16-5-1) -Élaboré à l'air - Trempé et revenu - Tôles et plaques - 0,6 mm ≤ a ≤ 50 mm - 900 MPa ≤ Rm ≤ 1 050 MPa
Luft- und Raumfahrt - Stahl FE-PM 3504 (X4CrNiMo16-5-1) - Lufterschmolzen - Gehärtet- und angelassen - Bleche und Platten - 0,6 mm ≤ a ≤ 50 mm - 900 MPa ≤ Rm ≤ 1 050 MPa This European Standard was approved by CEN on 11 July 2008.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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B-1000 Brussels © 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 4642:2009: ESIST EN 4642:2009
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