Why should Stainless Steel Welded Pipe undergo Heat Treatment?

March 01, 2024

The function of heat treatment is to improve the mechanical properties of the material, eliminate the residual stress and improve the machinability of the metal. 

Heat treatment processes can be divided into two categories: preliminary and final. 

Today, welded pipe mold manufacturers mainly talk to you about why stainless steel welded pipes should be heat treated.

1. Preliminary heat treatment

The heat treatment process has annealing, standardization, aging and adjustment, the purpose is to improve the processing performance, 

eliminate the internal stress, and prepare the metal phase for the final heat treatment.

(1) Annealing and normalizing

For hot-worked blanks, carbon steels and alloy steels with a carbon content greater than 0.5% are often annealed to facilitate cutting and thus reduce hardness. 

Carbon and alloy steels with less than 0.5% carbon use normalizing to avoid bonding knives when the hardness is too low. Both can be trimmed and uniformly prepared grains for later heat treatment. 

It is often scheduled to be carried out after blank manufacturing and before rough machining.

(2) aging treatment

It is mainly used to eliminate the internal stress generated during blank manufacturing and processing.

Welded pipe mold manufacturers said that in order to avoid excessive transportation workload, for parts with general precision, an aging treatment can be reserved before finishing. 

However, high-precision parts (such as jig boring boxes, etc.) need to be placed at least two aging processes. Simple parts are generally not aged.

In addition to castings, for some precise parts with low stiffness, in order to eliminate the internal stress generated during processing and stabilize the machining accuracy of the parts, 

multiple aging treatments are usually carried out between rough machining and semi-finishing. 

Some shaft parts processing in the school after direct engineering also to arrange aging treatment.

(3) tempering

Tempering is the high temperature tempering treatment after quenching, it can obtain uniform and detailed tempering sorbite preparation, 

for the future surface quenching and nitride treatment to reduce deformation to prepare, so tempering can also be used as a preparatory heat treatment.

2. The final heat treatment

The aim is to improve mechanical properties such as hardness, wear resistance and strength

(1) Quenching

Surface quenching is widely used because of small deformation, oxidation and decarburization, and it also has the advantages of high external strength and good wear resistance, 

while maintaining good toughness and strong impact resistance inside. 

In order to improve the mechanical properties of surface quenched parts, tempering or normalizing heat treatment is often needed as a preparatory heat treatment.

(2) carburizing and quenching

Carbon quenching is suitable for low carbon steel and low alloy steel, first improve the carbon content of the surface of the parts, 

after quenching to make the surface become high hardness, maintain a certain strength and high toughness.

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