Introduction of hot pressed elbow

Hot-pressed elbow is a kind of elbow which is made by using professional equipment after heating the pipe, then cutting and heating it to the critical temperature. After holding for a period of time, the elbow is put into the quenching agent quickly, so that its temperature drops sharply, and the elbow is made by the method of rapid cooling which is faster than the critical cooling speed.

ASTM A234 Gr WP91 SCHXXS ANSI B16.9 180 degree pipe elbows

ASTM A234 Gr WP91 SCHXXS ANSI B16.9 180 degree pipe elbows

One of the treatment methods: quenching

Quenching is to heat the elbow above the critical temperature for a period of time, and then quickly put into the quenching agent, so that its temperature drops sharply, cooling faster than the critical cooling speed, and obtain a martensite-dominated unbalanced structure of the heat treatment method. Quenching can increase the strength and hardness of steel, but reduce its plasticity. The common quenchants used in quenching are water, oil, alkali water and salt solution.

Processing Method II: Normalizing

Normalizing is a heat treatment method that heat the hot-pressed elbow to above the critical temperature so that all the hot-pressed elbows are transformed into homogeneous austenite and then naturally cooled in the air. Normalizing can eliminate the net cementite of hypereutectoid hot-pressing elbow. For hypoeutectoid hot-pressing elbow, normalizing can refine the crystal lattice and improve the comprehensive mechanical properties. It is more economical to replace quenching process with normalizing for elbow with low requirement.

Haihao Group manufacture pipe elbows more than 30 years,which contain 45 degree elbow,90 degree elbow,180 degree elbow,long radius elbow,short radius elbow,the materials are carbon steel,stainless steel,alloy steel.We supply the elbows according to standards ANSI/ASME B16.9,ANSI/ASME B16.28,MSS SP-75,EN 10253,DIN 2605,GOST 17375,JIS B2311,etc.If you want to know more about our products,please email