EN ISO 377:2017 PDF

Overview

EN ISO 377:2017 (ISO 377:2017) defines requirements for the identification, location and preparation of samples and test pieces for mechanical testing of steel products. It applies to steel sections, bars, rods, flat products and tubular products (as defined in ISO 6929) and, by agreement, can be used for other metallic products. The standard ensures that samples taken for tensile, impact, hardness and other mechanical tests are representative, traceable and prepared in a controlled way for reliable test results. Where an order or a product standard conflicts with EN ISO 377:2017, the order/product standard takes precedence.

Key topics and requirements

• Scope and definitions: Clarifies terms such as test unit, sample product, sample, rough specimen and test piece to standardize sampling vocabulary.
• Representative testing: Samples and test pieces selected per Annex A are considered representative of the product; acknowledges material variability from production processes.
• Identification and traceability: Samples, rough specimens and test pieces must be marked or otherwise traceable to the original product; transfer of marks is required when preparing specimens.
• Sample selection and dimensions: Samples must be of sufficient size to yield required test pieces and any needed retests; location guidance is provided in Annex A.
• Axis orientation: Direction of the test-piece axis relative to the principal working direction must follow the product standard or ISO 3785.
• Conditioning - as‑delivered vs reference:
  • As-delivered: Samples separated after forming/heat treatment or separated before and heat-treated to the same conditions as the product.
  • Reference condition: Samples or rough specimens may be heat treated to represent intended final condition; heat treatment must be controlled and measured.
• Preparation methods: Rules for cutting, machining, mechanical treatment and reference heat treatment of rough specimens and test pieces.
• Automatic systems: Permits alternate marking/control when fully automatic in-line preparation/testing systems provide adequate traceability procedures.

Applications and users

EN ISO 377:2017 is used by:

• Steel manufacturers and mills for production control and acceptance testing
• Independent testing laboratories and inspection bodies for conformity assessment
• Purchasers and specifiers to define sampling in purchase orders and material standards
• R&D and quality teams for standardized mechanical testing preparation

Practical applications include acceptance sampling, warranty testing, certification, material verification and dispute resolution where consistent sampling and specimen preparation are critical.

Related standards

• ISO 6929 - steel product vocabulary (referenced for product definitions)
• ISO 3785 - designation of test specimen axes
• Product-specific standards and test-method standards - where they differ, they take precedence over EN ISO 377:2017

Keywords: EN ISO 377:2017, ISO 377:2017, steel sampling, sample preparation, mechanical testing, test pieces, traceability, reference condition.