SIST EN 4470:2009

• Abstract:

  This standard specifies the requirements relating to:; Steel FE-PM1505 (X1CrNiMoAlTi12-9-2); Vacuum induction melted and consumable electrode remelted; Solution treated and precipitation treated; Forgings; a or D ≤ 150 mm; Rm ≥ 1 200 MPa; for aerospace applications.

• Status: Published
• Publication Date: 31-Mar-2009
• ICS: 49.025.10 - Steels
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 23-Mar-2009
• Due Date: 28-May-2009
• Completion Date: 01-Apr-2009
• Ref Project: EN 4470:2007 - Aerospace series - Steel FE-PM1505 (X1CrNiMoAlTi12-9-2) - Vacuum induction melted and consumable electrode remelted - Solution treated and precipitation treated - Forgings - a or D ≤ 150 mm - Rm ≥ 1 200 MPa

• Refers: SIST EN 4700-006:2026 - Aerospace series - Steel and heat-resisting alloys - Wrought products - Technical specification - Part 006: Pre-production and production forgings
• 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
• Refers: SIST EN 4346:2007 - Aerospace series - Steel FE-PM1505 (X1CrNiMoAlTi12-9-2) - Vacuum induction melted and consumable electrode remelted, softended, forging stock a or D <= 300 mm
• 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

SIST EN 4470:2009 is the Slovenian adoption of EN 4470:2007 for an aerospace steel forging grade. It specifies the material, melting route, heat treatment, size range and acceptance checks for FE-PM1505 (X1CrNiMoAlTi12-9-2) forgings used in aerospace applications.

What does SIST EN 4470:2009 specify?

SIST EN 4470:2009 specifies requirements for forgings made from steel FE-PM1505, produced by vacuum induction melting and consumable electrode remelting, then solution treated and precipitation treated. The covered product form is forgings in the size range a or D ≤ 150 mm, with a tensile strength requirement identified as Rm ≥ 1 200 MPa in the scope.

The document is organized around the scope, normative references, material designation, chemical composition, melting method, form and production route, delivery condition, heat treatment, and the property and inspection requirements. In practice, that means the standard tells a supplier what material route to use, what condition to deliver, and what tests and inspections to show before the forgings can be accepted.

What are the key requirements of SIST EN 4470:2009?

SIST EN 4470:2009 ties the product to one specific steel designation: FE-PM1505, also written X1CrNiMoAlTi12-9-2. That matters because the buyer is not choosing a generic stainless steel forging, but a defined aerospace grade with a controlled composition and processing route.

Material definition and production route

The standard requires vacuum induction melting followed by consumable electrode remelting. It also states that the product is a forging made from forging stock to EN 4346 and that EN 4700-6 applies as the technical specification for pre-production and production forgings. In practice, the melt route and upstream stock control help keep the material consistent from heat to heat.

Size range and delivery condition

SIST EN 4470:2009 applies to forgings with a or D ≤ 150 mm. It gives two delivery conditions: solution treated, and solution treated plus precipitation treated, with delivery condition codes W and U. For a buyer, that means the order must clearly state which delivery condition is needed, because the final properties depend on the heat treatment condition.

Heat treatment and properties

The standard links each delivery condition to a defined heat treatment sequence and then to mechanical property checks. Clause 8 covers proof stress, tensile strength, elongation, reduction of area, hardness and impact strength, with test directions and temperatures specified in the table. In practice, this is what the quality team uses to verify that the forging is fit for its aerospace use.

Inspection and quality checks

SIST EN 4470:2009 also refers to grain size, external defects, internal defects, batch uniformity, marking inspection and dimensional inspection. Most of these checks point back to EN 4700-6. That means acceptance is not based only on chemistry and strength, but also on surface condition, internal soundness, traceability and dimensional conformity.

Qualification

Clause 100 states that product qualification is to be agreed between manufacturer and purchaser. In practice, this gives both sides a place to define the qualification program for the intended application, rather than relying only on the routine delivery checks.

What terms does SIST EN 4470:2009 define?

• FE-PM1505 - The steel designation used for the forgings covered by this standard.
• X1CrNiMoAlTi12-9-2 - The EN chemical designation for the same steel grade.
• Rm - Tensile strength, the strength criterion highlighted in the scope and property table.
• a or D - The size limit used for the forgings, expressed as thickness or diameter.
• Forgings - The product form covered by the standard, not bar, sheet or cast product.
• W - The delivery condition code for the solution treated state.
• U - The delivery condition code for the solution treated and precipitation treated state.

Who uses SIST EN 4470:2009?

SIST EN 4470:2009 is used by aerospace material engineers, forging manufacturers, heat-treatment shops, quality control teams and purchasing staff. They use it to define the grade, agree the delivery condition, set up testing, and check whether a forging lot is acceptable for aerospace service. It is also relevant when a buyer needs a written specification for a high-strength forged steel part with controlled processing and inspection.

What changed in SIST EN 4470:2009 from the previous edition?

SIST EN 4470:2009 is the Slovenian national adoption of EN 4470:2007. The text presented here identifies it as identical to that European Standard.

Which standards are used with SIST EN 4470:2009?

• EN 4258 - Gives the general organization of aerospace metallic material standards and the links between standard types.
• EN 4346 - Covers softened forging stock for the same steel grade and supplies the upstream material form.
• EN 4500-5 - Sets the drafting and presentation rules for steel material standards.
• EN 4700-6 - Provides the technical specification for pre-production and production forgings used by this standard.

What does the SIST EN 4470:2009 document contain?

The document contains a composition table for FE-PM1505, a production-route table, and a heat-treatment and delivery-condition table. It also contains a property table covering proof stress, tensile strength, elongation, reduction of area, hardness and impact strength, along with the relevant test directions and temperatures.

It further gives requirements for grain size, external defects, internal defects, batch uniformity, marking inspection and dimensional inspection. These parts are used for supplier qualification, routine acceptance testing and aerospace procurement.

The final clause states that product qualification is to be agreed between manufacturer and purchaser, which makes the document useful as a basis for a defined qualification program rather than a fully self-contained certification scheme.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.03D49.025.10JeklaSteelsICS:Ta slovenski standard je istoveten z:EN 4470:2007SIST EN 4470:2009en,de01-maj-2009SIST EN 4470:2009SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4470
July 2007 ICS 49.025.10 English Version
Aerospace series - Steel FE-PM1505 (X1CrNiMoAlTi12-9-2) - Vacuum induction melted and consumable electrode remelted - Solution treated and precipitation treated - Forgings - a or D ≤ 150 mm - Rm ≥ 1 200 MPa
Série aérospatiale - Acier FE-PM1505 (X1CrNiMoAlTi12-9-2) - Élaboré sous vide par induction et refondu à l'électrode consommable - Mis en solution et vieilli - Pièces forgées et pièces matricées - a ou D ≤ 150 mm - Rm ≥ 1 200 MPa
Luft- und Raumfahrt - Stahl FE-PM1505 (X1CrNiMoAlTi12-9-2) - Vakuuminduktionserschmolzen und mit selbstverzehrender Elektrode umgeschmolzen - Lösungsgeglüht und ausgelagert - Schmiedestücke - a oder D ≤ 150 mm - Rm ≥ 1 200 MPa This European Standard was approved by CEN on 15 February 2007.
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.
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B-1050 Brussels © 2007 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 4470:2007: ESIST EN 4470:2009
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