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Understanding Mill Test Reports


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Quality assurance is a significant component of the metal manufacturing business. To prove and document that quality assurance for customers, companies use Mill test reports (MTRs). Mill test reports certify a metal product's physical and chemical properties and highlight its overall compliance with international standards. Because businesses must keep MTRs for up to three years, the reports also trace footprints back to the beginning of production, ensuring that no product information is lost.

What's Included on a Mill Test Report?

Product Description

The MTR allows a customer to glance at an overview of their product, and see details about its​ dimensions, alloy influence, hardness, and elasticity. This section includes ANSI and ASME certifications as well, if applicable.

Chemical Analysis

The chemical analysis portion of an MRT describes any alloys used to produce the metal. Aluminum, chromium, copper, and bronze are examples of common alloys. Depending on its alloy makeup, some metals may be stronger, harder, or more resistant to corrosion. The MTR includes a breakdown of each alloy. Certain alloys must fall within required ranges to meet product specifications.

Mechanical Properties

The MTR details the layout of the metal's mechanical properties. The customer can see the qualities and corresponding numbers that prove the product's strength, ductility, elasticity, and hardness. Any conditions that could directly impact the intended use of the product are included in this section.

Heat Number/Code

A heat number signifies the specific batch in which a piece of metal originated. The heat code is stamped or written on the metal before it leaves the mill. If a manufacturing facility processed the metal, the facility creates a Component Manufacturer Heat Code for the product. 

The ultimate purpose of the heat code is to help ensure the quality and reliability of a product. The code allows mills, manufacturers, and consumers to track the product to its beginning stages. This way, if there is an issue with the metal, the number can direct the customer or manufacturer back to the source.

The Importance of Mill Test Reports

MTRs create a system of checks and balances, which is crucial for products that must meet certain standards and specifications. They promote an organized production process that strengthens the manufacturer/customer relationship.

Handling MTRs properly is an important part of quality management and risk management systems. It's an essential step that can help a business earn a coveted ISO certification and contribute to its overall success.

Be sure your business is approaching Mill test reports the right way. It's a conscientious step that will prevent trouble down the road. If you're a customer who receives an MTR along with your delivery of stainless steel, take time to review it to ensure your metal meets your specifications.