---
code: "ISO 6892-3"
title: "Metallic materials — Tensile testing — Method of test at low temperature"
institution: "ISO"
category: "material-testing"
revision: "2015"
scope: "Defines axial tensile testing of metallic materials at low and cryogenic temperatures (typically between about +10 °C and −196 °C, liquid-nitrogen level) to assess mechanical limits and brittle-to-ductile behaviour in cold service."
testMethod: "A specimen is cooled uniformly, gripped, and pulled while force and extension are recorded; temperature must remain stable through the gauge section. Strain measurement requires extensometers and grips that retain accuracy despite contraction and frost effects."
specimenRequirements: "Specimen types align with ISO 6892-1 where applicable; conditioning time, transfer limits, and soak procedures control thermal gradients. Low-temperature grips and extensometry are mandatory; liquid-nitrogen supply and safety interlocks apply for cryogenic tests."
url: "https://vectorbtc.com.tr/resources/standards/iso-6892-3/"
---

ISO 6892-3 addresses tensile qualification when materials must perform in LNG tanks, aerospace structures, polar infrastructure, or other sub-zero duty. It complements [ISO 6892-1](/resources/standards/iso-6892-1/) at room temperature and [ISO 6892-2](/resources/standards/iso-6892-2/) at high temperature within the same ISO 6892 family.

Homogeneous cooling and stable gauge-section temperature are as important as load control. Vector environmental chambers on universal testing machines support controlled cold ramps, LN₂ circuits where required, and extensometer options that maintain traceability through the transition region.

Laboratories typically pair the UTM with a thermal enclosure, cryogenic feed system, and low-temperature grips. Results feed ductile-to-brittle transition studies and acceptance criteria tied to project minimum service temperatures.