Difference between steel quality certificate 2.2 and 3.1

A steel quality certificate is an essential document that accompanies steel products to ensure that they meet the quality standards and technical specifications required for their application.

It serves as proof of the conformity of materials with contractual requirements, international standards and any other applicable regulations.

Here are the main elements that such a certificate contains:

Identification of the manufacturer

Name and address of the manufacturer supplying the material, ensuring traceability.

Description of the material

Details of the type of steel, including grade or class, form (bar, plate, tube, etc.), dimensions and, if applicable, heat or surface treatments applied.

Heat number

This information allows the material to be traced back to the specific production batch from which it came, providing a high level of traceability.

Chemical composition

Results of chemical analysis showing the percentages of various elements contained in the steel, such as carbon, manganese, chromium, nickel, etc. These details are crucial to ensure that the material meets the required chemical specifications.

Mechanical properties

Includes information on tensile strength, yield strength, elongation at break, resilience (energy absorbed in impact test). If relevant, also include material hardness. These properties are measured by standardised tests and give an indication of the behaviour of the material under mechanical loads.

Heat treatments

If the material has undergone heat treatments (such as normalizing, tempering), details of these treatments and their results will be included.

Dimensions and tolerances

Specifications of material dimensions and allowable tolerances as per applicable drawings or standards.

Test results

Details of the various types of tests to which the material has been subjected, such as tensile tests, impact tests, ultrasonic or radiographic examinations to detect internal defects.

Standards and specifications

References to specific standards (such as ASTM, EN, JIS, ISO) or other technical specifications that the material meets.

DIFFERENCE BETWEEN STEEL QUALITY CERTIFICATE 2.2 AND 3.1

A steel quality certificate is a crucial document for engineers, architects, builders and other interested parties. The document ensures that the material used in their projects is of high quality and meets all the necessary requirements for safety, durability and performance.

CERTIFICATE 2.2

It is a document declaring that the metal products are in conformity with the order and the buyer’s specifications, based on non-specific tests performed by the manufacturer. In other words, it confirms that the material has been tested according to a general inspection plan, but does not include the results of individual tests.

It includes a confirmation that the material meets the contractual requirements, based on the manufacturer’s internal tests. The document may include summaries of test results or chemical and mechanical analyses, but does not provide detailed test reports for each item or batch of material.

CERTIFICATE 3.1

This type of certificate offers a higher level of assurance than the 2.2 certificate. It is issued by the manufacturer and confirms that the metal products are in conformity with the order. It includes the specific results of tests performed on the material. This type of certificate is often required in industries where material safety and conformity are critical, such as the chemical, oil and gas industries.

In addition to the information in certificate 2.2, certificate 3.1 includes specific test results performed on the material. These include chemical composition and mechanical properties (tensile strength, yield strength, elongation, etc.). These results are directly related to the batch of material to which the tested article belongs. The certificate must be signed by an authorised representative of the manufacturer, who is responsible for the quality control department.

The main difference between these two types of certificates is the level of detail and specificity of the test results provided.

The 3.1 certificate is more detailed, providing greater quality assurance by including specific test results for each batch or item. This makes it preferable in applications where compliance and material performance are particularly important.

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