ISO 23213:2022

Carbon steel wire for bedding and seating springs

This document specifies requirements for carbon steel wire of round cross-section supplied in the cold-draw condition intended for the manufacture of springs for bedding and seating used in the automotive and furniture manufacturing industries. This document is applicable to wire supplies in the uncoated condition, that is, without a metallic coating.

Fil d’acier au carbone pour ressorts de literie et sièges

General Information

• Status: Published
• Publication Date: 22-Mar-2022
• ICS: 77.140.25 - Spring steels
• Technical Committee: ISO/TC 17/SC 17 - Steel wire rod and wire products
• Drafting Committee: ISO/TC 17/SC 17/WG 17 - Carbon steel wire for bedding and seating springs
• Current Stage: 6060 - International Standard published
• Start Date: 23-Mar-2022
• Due Date: 07-Feb-2023
• Completion Date: 23-Mar-2022

Overview

ISO 23213:2022 - Carbon steel wire for bedding and seating springs - specifies requirements for cold-drawn, round carbon steel wire supplied in the uncoated condition for manufacture of springs used in bedding and seating in the automotive and furniture industries. The standard defines classification, dimensional and mechanical requirements, testing, inspection, packing and marking to ensure consistent spring performance and interchangeability.

Key Topics and Requirements

• Scope & classification
  • Applicable nominal diameters: 0.80 mm to 6.00 mm.
  • Five wire types (I–V) for different spring applications (e.g., pocket, Bonnell, link, edging, sinuous) with recommended diameter ranges.
• Diameter, tolerance & geometry
  • Diameter measured as mean of two orthogonal micrometer readings; specified tolerances vary by diameter range (examples provided in the standard).
  • Ovality limits, wire cast (circular and helix cast) and tip rise requirements are specified.
• Mechanical properties
  • Tensile strength requirements given by type and diameter (detailed ranges for Types I–V).
  • Maximum tensile range variation within a batch: 150 MPa.
• Forming tests
  • Wrapping test (ISO 7802) for wire < 4.0 mm - wire must not fracture when close wrapped three turns around a mandrel equal to the wire diameter.
  • Torsion test (ISO 7800) for Types I–III with specified torsion values.
  • Tensile testing per ISO 6892-1.
• Surface and manufacturing
  • Surface must be smooth and free from defects that adversely affect use; welds after cold drawing are not permitted.
  • Minimum coil weights and single-heat coil requirements are defined.
• Inspection & sampling
  • Routine inspection items per coil (diameter, surface, cast, tip rise) and sample-based tests for tensile, wrapping and torsion (typically 10% of coils, at least 3).
  • Batching rules, retest and acceptance criteria provided.
• Marking & purchaser information
  • Example marking: “φ2,80 mm - Type II - ISO 23213:2022”.
  • Purchaser must specify classification, nominal diameter, tensile grade, anti-rust treatment, quantity, unit mass, etc.

Applications and Users

• Intended for spring manufacturers, wire producers, OEMs in automotive seating and furniture (mattresses, seat frames, sinuous springs, pocket springs).
• Useful for procurement, quality control, product design and compliance teams specifying uncoated carbon spring wire for bedding and seating applications.

Related Standards (normative references)

• ISO 6892-1 - Tensile testing of metallic materials
• ISO 7800 - Wire torsion test
• ISO 7802 - Wire wrapping test
• ISO 16120-1 / ISO 16120-2 - Non-alloy steel wire rod requirements

Keywords: ISO 23213:2022, carbon steel wire, bedding and seating springs, spring wire, tensile strength, wrapping test, torsion test, diameter tolerance, uncoated wire, automotive, furniture.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 23213
First edition
2022-03
Carbon steel wire for bedding and
seating springs
Fil d’acier au carbone pour ressorts de literie et sièges
Reference number
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
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or ISO’s member body in the country of the requester.
ISO copyright office
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification and marking .2
4.1 Classification . 2
4.2 Marking . 2
5 Information supplied by the purchaser . 3
6 Requirements . 3
6.1 Diameter, appearance, coil weight . 3
6.1.1 Diameter range . 3
6.1.2 Diameter and tolerance . 3
6.1.3 Ovality . 3
6.1.4 Cast . 3
6.1.5 The minimum coil weight . 4
6.1.6 Welds . . 4
6.2 Steel grade and chemical composition . 5
6.3 Mechanical properties . 5
6.3.1 Tensile strength . 5
6.3.2 Wrapping test . 6
6.3.3 Torsion test . 7
6.4 Surface quality . 7
6.5 Special requirements . 7
7 Inspection and testing .7
7.1 Requirements . 7
7.2 Inspection and acceptance . . . 7
7.3 Batching rule . 7
8 Retest. 7
9 Packing and identification .8
iii
Foreword
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This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 17, Steel wire
rod and wire products.
Any feedback or questions on this document should be directed to the user’s national standards body. A
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iv
INTERNATIONAL STANDARD ISO 23213:2022(E)
Carbon steel wire for bedding and seating springs
1 Scope
This document specifies requirements for carbon steel wire of round cross-section supplied in the cold-
draw condition intended for the manufacture of springs for bedding and seating used in the automotive
and furniture manufacturing industries.
This document is applicable to wire supplies in the uncoated condition, that is, without a metallic
coating.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 7800, Metallic materials — Wire — Simple torsion test
ISO 7802, Metallic mat
...