Is water quenching allowed for normalizing?

According to some books, normalizing, also known as normalizing treatment, is a metal heat treatment process in which the workpiece is heated to 30–50°C above Ac3 or Accm, held at that temperature for a certain period of time, and then taken out of the furnace and cooled in air or by means of water spraying, misting, or air blowing. Another definition is that normalizing is a heat treatment method in which steel is heated above its critical temperature to cause it to transform entirely into uniform austenite, and then it is cooled naturally in air. May I ask if it is possible to cool it with water?

Normalizing involves natural cooling; if water is used for cooling, then it would be considered quenching. It still depends on the cooling temperature – whether it exceeds the critical cooling temperature. If water is used, the way in which it is applied is a matter of concern Spraying water mist is better (remove the ~; it’s still being blocked, weird). Last edited by soulblack on 2009-2-6 at 15:51.]

Water quenching is not possible, as it will result in a hardened layer with insufficient strength; the steel grade can be changed instead. If water quenching is used, only the hardness will increase while the strength will not.

In principle, water quenching is also an option, but it’s important to control the cooling rate properly; if it’s too fast, a hardened layer will form.

Absolutely not allowed? Is it a pressure vessel? Is it a cast or a welded piece? No matter what type of manganese steel it is, normalizing treatment cannot improve its mechanical properties; it can only adjust the surface hardness! If it is a container, air cooling with simultaneous reinforcement from the inside and outside can be used. The correct approach is: to adjust the heat treatment process ； Manganese steel with a slightly higher carbon content is selected. Too little information is provided; the above is for reference only. Please choose the materials and manufacturing processes carefully.

It is a manganese steel pipe without a seal, delivered in the hot-rolled state; after processing, normalizing treatment is required to improve the mechanical properties of the material. Quenching and tempering would be ideal, but it is costly. Normalizing with air cooling is generally sufficient to meet the requirements, but sometimes the strength is not adequate; increasing the cooling rate by using water spray can boost the strength, though it is not clear whether this is allowed in the normalizing process. Some definitions of normalizing state say it is possible, while others say it is not. Last edited in this post by GUANGWEI8.26 on 2009-4-28 21:04.]

Water definitely won’t work; spraying, followed by blowing and then air cooling, can be used. Is the normalizing treatment of your manganese steel container a post-weld heat treatment or a heat treatment of the steel plate itself? If it’s a steel plate, low-temperature tempering is generally used. Last edited in this post by gzk1986 on 2009-2-7 10:09]

It cannot be exposed to water; exposing it to water is known as quenching, and if there are relevant requirements, tempering must also be carried out

The watering mentioned here does not mean continuously spraying water until cooling is achieved; rather, after coming out of the furnace, water is sprayed in a watering area to speed up the cooling process, after which cooling takes place by air. The final structure was still pearlite, with no martensite appearing. The key to determining whether normalizing heat treatment is appropriate is to look at the final microstructure; or rather, is air cooling necessarily required for the cooling method? I think it’s fine if the structure is pearlite

Rain exposure does not involve spraying the equipment with a water gun; rather, it involves increasing the humidity in the environment surrounding the equipment. I think it’s possible. Last edited by Power-Free Theory on 2009-2-7 20:44]

Bro, you work with gas cylinders, right? Is it referring to the treatment of 37Mn normalized cylinders? If it’s possible, feel free to ask me!

How to control the cooling rate during water quenching in order to achieve a hardened layer?

\"Materials and Heat Treatment for Pressure Vessels\", compiled by the Editorial Committee of the Practical Technology Series on Pressure Vessels. Section 2.3.2.2 deals with the normalizing process for commonly used steels in pressure vessels: The heating temperature for normalizing is generally 30–50°C above Ac3; the holding time depends on the effective thickness of the steel, with an average of 1.5–2.5 minutes per millimeter. The cooling method is usually air cooling (natural cooling in still air), but wind cooling (using compressed air or a blower to force convection of air) as well as spray cooling (using compressed air to atomize water as a cooling medium) can also be employed. For extra-thick steel plates or forgings (with a thickness δ ≥ 200 mm), water-accelerated cooling normalizing can also be used. The above can be used as a reference.

Pressure vessels are permitted and suitable for thicker sheets of metal. . For such structural components, if the carbon content is unknown, it cannot be too high!

Spray cooling is permitted; for example, when manufacturing the head of a gasifier, for S387 material, after pressing it and performing normalizing heat treatment, spray water cooling is required

Based on the material conditions, it is possible; many such things have already been done nowadays. The idea that normalizing involves air cooling while quenching involves water cooling is a concept from over 30 years ago; it is no longer applicable today. An update is needed; the heat treatment method cannot be determined based on form, but rather must be assessed on an essential level. For more details, please refer to: http://www.rclhome.com/forum.php?mod=viewthread&tid=13264&extra=page%3D1 Interpretation of terms and definitions related to normalizing and quenching heat treatment for pressure vessel heads

Heat treatment processes are constantly evolving. The water cooling method mentioned by the original poster refers to the traditional form of water cooling; nowadays, normalizing can be carried out through atomization to accelerate cooling, and water cooling is allowed for thick plates. Moreover, methods such as Tmcp and normalizing rolling are increasingly recognized as alternatives to conventional normalizing. In such cases, it is best to obtain confirmation from a design institute, as most of these devices are custom-made. Those who need normalized steel plates can consult me. Expert in special steel services, Qi Tao 13103710876