ISO 20723:2004 PDF

Name: ISO 20723:2004 — Structural steels — Surface condition of hot-rolled sections — Delivery requirements
SKU: ISO 20723:2004
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Structural steels — Surface condition of hot-rolled sections — Delivery requirements

Название (английский):

ISO 20723:2004

Structural steels — Surface condition of hot-rolled sections — Delivery requirements

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 9
Дата публикации:: 6 декабря 2004 г.
Издание:: ISO IS 20723 edition 1 version 1
ICS:: 77.140.60

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Описание (английский):

ISO 20723:2004 specifies delivery requirements that apply to the surface condition of hot-rolled sections with nominal thickness between greater than or equal to 3 mm and less than or equal to 160 mm. It applies to all surfaces excluding edges.

Abstract

Overview - ISO 20723:2004 (Structural steels, surface condition)

Key topics and technical requirements

Scope & measurement
- Applies to hot-rolled sections (3–160 mm nominal thickness), excluding edges.
- Depth of representative discontinuities is measured from the product surface after the discontinuity is removed (e.g., by grinding).
- Affected area is determined by drawing a continuous line 20 mm from isolated, clustered or linear discontinuities. Aligned discontinuities and proximity rules are defined (e.g., edges closer than 40 mm considered one discontinuity).
Classification
- Distinguishes imperfections (within limits) and defects (exceeding limits that require repair).
- Divides requirements into Types (Type 1 and Type 2), Classes (C - general applications; D - special applications), and Subclasses (1 grinding permitted; 2 welding only if agreed; 3 welding not permitted).
Permissible depths and area limits
- Class C and Class D have separate maximum permissible depths by nominal thickness (e.g., Class D limits are stricter: 0.5 mm for 3–20 mm, up to 1.5 mm for 80–160 mm).
- Areas with remaining thickness below minimum tolerances are allowed up to 15% for Class C and 2% for Class D of inspected surface (Type 2 requires remaining thickness not be below minimum).
Repair procedures
- Grinding/machining: discontinuities must be removed fully; maximum grinding allowance below minimum thickness is specified by thickness range.
- Welding: allowed only under specified conditions - removal of defect prior to welding, qualified operators/procedures, post-repair NDT verification. Welding must not reduce section thickness below 70% of nominal. Limits on total welded area mirror the ground-area limits (15% Class C, 2% Class D).
Common discontinuities
- Annex A lists typical surface issues: rolled-in scale, pitting, roll marks, scratches, blisters, hot tears, seams, cracks and inclusions.

Applications and who uses ISO 20723

Target users: steel producers, structural fabricators, quality inspectors, procurement engineers, construction project managers and testing laboratories.
Practical uses:
- Define delivery acceptance criteria for hot-rolled profiles.
- Specify allowable surface repair methods and documentation for purchasing agreements.
- Guide inspection, non‑destructive testing (NDT) and quality assurance on structural steel.

Related standards

ISO 6929 (definitions/classification of steel products)
ISO 404 (general technical delivery requirements)
Relevant ISO product standards for dimensional tolerances (e.g., ISO 657 series for hot-rolled sections)

Keywords: ISO 20723, structural steels, surface condition, hot-rolled sections, delivery requirements, defects, imperfections, repair procedures, welding, grinding, class C, class D.

Технические детали

Технический комитет: ISO/TC 17/SC 3 - Steels for structural purposes
SKU: ISO 20723:2004

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