Welding Properties of Low Alloy Duplex Stainless Steel 00Cr21Mn5NiN

Welding Performance of Low-Alloy Dual-phase Stainless Steel 00Cr21Mn5NiN

Low-alloy dual-phase stainless steel 00Cr21Mn5NiN is a kind of steel with good weldability and high strength. 00Cr21Mn5NiN has good comprehensive mechanical properties and excellent stress corrosion cracking resistance. It is mainly used in low and medium pressure vessels, oil pipelines and machinery structures. In order to make full use of the properties of this type of steel, welding technology should be paid attention to when using. This article mainly introduces the welding performance of low-alloy dual-phase stainless steel 00Cr21Mn5NiN.

First of all, the welding characteristics of 00Cr21Mn5NiN steel are as follows: when welding 00Cr21Mn5NiN steel, the temperature of the welding heat affected zone (HAZ) is easy to rise, and the hardness of the HAZ should be paid attention to when welding, otherwise the properties of the welded joint will be damaged; the weldability of 00Cr21Mn5NiN steel is slightly worse than that of ordinary stainless steel due to its higher alloy content;The welding process should be preheated and post-welded when welding difficult-to-weld components with 00Cr21Mn5NiN steel, and the preheating temperature of the welded joint should not be lower than 200°C.

Secondly, the welding characteristics of 00Cr21Mn5NiN steel can be introduced in detail. 00Cr21Mn5NiN steel is an austenitic-ferritic dual-phase stainless steel. The main alloying elements of this kind of steel are nickel, molybdenum, nitrogen and chromium. The ferrite and austenite are mixed in different proportions in the microstructure. In addition, 00Cr21Mn5NiN steel has strong stress corrosion resistance and large resistance to chloride stress, which makes it suitable for welding in harsh environments. The available welding materials for 00Cr21Mn5NiN steel include MG-312 austenite type flux-cored wire and AWS E308L stainless steel electrode.

Thirdly, in practical applications, it is necessary to pay attention to the welding precautions of 00Cr21Mn5NiN steel. In general, it is necessary to preheat the welded joint before welding and keep the heat input as low as possible during welding. In order to prevent cold cracking of the weld, it is necessary to ensure that the residual stress and residual stress are properly relieved after welding. Meanwhile, the temperature of the HAZ should also be kept at a reasonable level. If the temperature of the welded joint is too high, the mechanical properties of the weld will be affected.

Fourthly, in order to ensure the accuracy of the welding, it is necessary to carry out the welding quality inspection of 00Cr21Mn5NiN steel. Generally, the destructive testing of the welded joint should be carried out in accordance with the relevant provisions of the standards. The bend test and tensile test of the welded joint should be carried out to evaluate the Mechanical properties of the welded joint. In addition, a visual inspection should also be carried out to observe the appearance of the welded joint.

To sum up, with the continuous development of technology, 00Cr21Mn5NiN steel has been widely used in various industries. In order to make full use of the properties of 00Cr21Mn5NiN steel, it is necessary to pay attention to its welding performance and necessary welding precautions during use.

00cr21mn5nin is a type of duplex stainless steel with low alloy composition,which is mainly used in chemical process and high temperature piping.It has good welding performance and is suitable for many welding processes.

For welding 00cr21mn5nin stainless steel,tungsten arc welding and manual metal arc welding are recommended.In order to ensure its welding performance and prevent welding defects, certain welding parameters, including welding current, electrode holder, welding speed, etc., need to be adjusted. The welding materials that match well with 00cr21mn5nin stainless steel are consumables with the same ASTM A182 and AISI 318L.

In order to ensure the weldability of 00cr21mn5nin stainless steel, it needs to strictly control the welding parameters. Tungsten arc welding and manual metal arc welding require larger welding current and slow welding speed. The average welding current is usually 115~140A, and the welding speed is about 3~4cm/min.

When welding stainless steel of this material, the use of heat conduction paste is recommended, and it should be applied to the joint part before welding. The paste can reduce the hardening of the base metal near the weldment, thus improving the compatibility of the welding.

If arc sprayed surface protection is needed, it should also be applied before welding. The arc sprayed layer is composed of steel or aluminum and can serve as an insulation layer between the base material and the weldment. Meanwhile, the arc sprayed layer should be flat and keep the surface clean.

In conclusion, 00cr21mn5nin stainless steel has good welding performance and can be welded by tungsten arc welding and manual metal arc welding. To ensure its welding performance,it is necessary to strictly control the welding parameters and auxiliary materials, such as heat conduction paste, arc sprayed layer, etc.