ASTM A991 Standard Test Method for Conducting Temperature Uniformity Surveys of Furnaces Used to Heat Treat Steel Products

The ASTM A991 test method measures temperature uniformity in a furnace for heat-treating steel items, ensuring it maintains acceptable temperature variation as per product specifications or agreed upon by clients and heat treatment service providers. The ASTM A991 test method is useful for people who use, manufacture, and provide calibration service for heat treat furnaces used to process steel products. ASTM A991 is used to determine the capability of the furnace to meet the permissible temperature variation specified in the applicable product specification, or as agreed to by the purchaser and supplier of heat treat services.


Introduction to ASTM A991

The ASTM A991 test method is used for heat treat furnaces in any of the following categories: Continuous or semi-continuous conveyance furnaces, Batch furnaces, and Salt or liquid baths and fluidized beds. Furnaces are used in various industries and applications for heating steel products. Regardless of the type of heat treatment furnace or processing cycle, users may need to be mindful of the temperature uniformity in the furnace and if the material is processed in a zone that may satisfy the pertinent allowed temperature fluctuation standards. The ASTM A991 test method can be utilized by anyone involved in manufacturing, using, or offering calibration services for heat treat furnaces used in steel product processing.

MaTestLab offers the best ASTM A991 testing service for our clients based in the USA and other parts of the world.

ASTM A991 Test Procedure

Specimen SelectionSteel specimens that match the size, shape, and thermal characteristics of furnace-processed products are chosen, ensuring they are clean, free from contaminants, and labeled for identification during testing.
Test Setup and ExecutionThe selected specimens are placed evenly in the furnace’s working space, ensuring they are not in direct contact. The furnace is run under normal conditions, and temperature measurements are recorded. The specimens are monitored until uniformity is achieved, typically after a dwell time. The data is analyzed to assess temperature uniformity. Deviations are reported, and corrective actions are taken if necessary to ensure the furnace meets the standards.

ASTM A991 Test Specimens

Specimen DetailsASTM A991 test specimens should be representative of steel products processed in the furnace, including components, parts, or samples. They should be size-matched to simulate real-world conditions and made of the same type or similar material, ensuring consistent thermal behavior during the test.
Specimen DimensionsThe dimensions of specimens depend on the typical dimensions of steel products processed in the furnace. Flat products can be rectangular, cylindrical, or complex-shaped, while cylindrical products can be 10 mm in diameter by 100 mm in length. For complex-shaped products, specimens should mimic their shapes and sizes as closely as possible.

ASTM A991 Test Results

A uniform temperature profile in the furnace is aimed at being achieved by providing a temperature map across its working space during the survey. The data is compared to the temperature uniformity criteria specified in the ASTM A991 standard, hot and cold spots are identified, and furnace compliance is determined. The reliability of heat treatment processes is confirmed, ensuring that high-quality, mechanically metallurgical steel products are produced.

Tests Related to ASTM A991

Important tests relevant to ASTM A991 include ASTM E207 for Thermal EMF Test of Single Thermoelement Materials by Comparison with a Reference Thermoelement of Similar EMF-Temperature, ASTM E220 (Test Method for Calibration of Thermocouples By Comparison Techniques), and ASTM E608 (Specification for Mineral-Insulated, Metal-Sheathed Base Metal Thermocouples).


Where can I get the astm a991 tested?

You can share your astm a991 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm a991 test to various testing techniques.

How much do I need to pay for the astm a991 test?

Please contact us for a detailed quote for your astm a991 testing needs. Cost incurred to carry out different astm a991 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.

How many samples are required for astm a991?

The required number of samples or specimens should comply with the procedure given in the astm a991 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.

How much discount can I get on the astm a991 test?

MaTestLab has a vast testing laboratory network, hence we bring you the best testing facilities in a cost-effective way. We offer considerable discounts (15-20%) to our returning customers based on test volume and frequency.

How many days will it take to complete the astm a991 test?

The turnaround time for astm a991 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.

Where can I get the astm a991 tested?

You can share your astm a991 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm a991 test to various testing techniques.

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