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Definition: Material specifications are binding technical stipulations regarding the chemical composition, mechanical properties, heat treatment and testing requirements of a material. They are based on standards or project-specific requirements. The aim is to define the material quality unambiguously.

Practical relevance: Specifications frequently refer to standards such as EN 10025, ASTM A516 or ISO material numbers. They define limit values for alloying elements, minimum strengths, impact energy, hardness ranges as well as the required test certificates (EN 10204). Unclear specifications increase the risk of material deviations and liability cases.

Decision-making perspectives:

• Technical decision-makers: Ensuring functionally and safety-appropriate material selection.
• Purchasing/project management: Contractually clear definition of scope of supply and quality verifications.
• Science: Assessment of material characteristic values in the context of new applications.
• Insurance/law: Basis for assessing contractual and quality deviations.

Typical testing or verification methods: Spectral analysis, mechanical materials testing, test certificates in accordance with EN 10204, comparison with standard tables.

FAQ:

• Why are precise material specifications important?
• They avoid scope for interpretation and ensure that materials meet the required technical properties.

Definition: Materials analysis is the systematic investigation of the chemical composition, microstructure and mechanical properties of a material. It serves to verify specification conformity as well as to determine the causes of failure. The analysis combines spectroscopic, microscopic and mechanical testing methods.

Practical relevance: Typical methods are spectral analysis (OES, XRF), metallography, scanning electron microscopy (SEM/EDX), hardness testing as well as tensile or impact testing. Alloying elements are assessed in accordance with the material standard (e.g. EN 10025, ASTM), grain size according to DIN EN ISO 643, phase fractions and characteristic values such as strength or toughness. The results are central to quality control, PMI and failure investigation.

Decision-making perspectives:

• Technical decision-makers: Verification of material conditions, heat treatment and microstructure quality.
• Purchasing/project management: Comparison with technical delivery conditions and test certificates (EN 10204).
• Science: Correlation of microstructure, composition and mechanical behaviour.
• Insurance/law: Court-proof evidence of material deviations or failure mechanisms.

Typical testing or verification methods: OES, XRF, SEM/EDX, metallography, hardness testing, tensile test, notched bar impact test.

FAQ:

• When is a materials analysis required?
• In the case of quality deviations, failures or to verify the material specification at incoming goods inspection.

Definition: Materials testing comprises all test methods for determining the mechanical, physical and chemical properties of a material. It serves to establish standardised characteristic values and to verify conformity with specifications. Tests can be carried out destructively or non-destructively.

Practical relevance: Typical mechanical tests are the tensile test (DIN EN ISO 6892-1), hardness testing (ISO 6506/6507/6508) and the notched-bar impact test (ISO 148-1). These are complemented by corrosion tests, microstructure analyses and spectral analyses. The results form the basis for material releases, quality assurance and safety assessments.

Decision-making perspectives:

• Technical decision-makers: Assessment of strength, toughness and suitability for defined operating conditions.
• Purchasing/project management: Requirement for standard-compliant test certificates (e.g. EN 10204 3.1) and acceptance criteria.
• Science: Analysis of relationships between microstructure and characteristic values.
• Insurance/law: Verification of specification-compliant properties in disputes or damage cases.

Typical testing or verification methods: Tensile test, hardness testing, notched-bar impact test, metallography, spectral analysis, NDT.

FAQ:

• What is the difference between destructive and non-destructive materials testing?
• Destructive tests determine characteristic values up to failure, whereas non-destructive methods test components without causing damage.