LAWAI INDUSTRIAL CORPORATION

No.1283-1, Ren-ai Road, Chunan Township, Miaoli County, Taiwan

＋886-3-6581116

[email protected]

www.lawai-alloytube.com

 

On the way to provide higher class heat-resistant tubes to the petrochemical industry worldwide – HP-Mod (HP-Nb) tube (centrifugal casting)

Developing HP-Mod tubes/ HP-Nb Mod tubes manufactured by centrifugal casting is one of our goals several years ago.  HP-Mod (HP-Nb) is the heat-resistant alloy.  However, it is more suitable than common heat-resistant alloys such as HK40, HK and SS310 to be used as the material for reformer tubes and it has already been the mainstream for the furnaces in petrochemical industry.  The HP-Mod tubes( HP-Nb tubes) perform longer stress- to- rupture life ( one of the mechanical properties) and the wall thickness of the tubes are able to be thinner.  The thin wall thickness would increase the heat-transfer rate then saves much energy cost.

 

The characteristics of HP-Mod (HP-Nb) tubes

The key feature of HP-Mod (HP-Nb) tubes is high creep resistance. Although the standards of creep resistance are different among petrochemical plants, the strict requirement of this mechanical property is the same. 

The lower proportion of Nb is in HP-Mod(HP-Nb) alloy, this improves the carbonization resistance and strengthen the durability in the high temperature environment.

 

The applications of HP-Mod(HP-Nb) tubes produced by centrifugal casting

The HP-Mod(HP-Nb) tubes manufactured by centrifugal casting are for reformers and pyrolysis furnaces. They are also used as the high temperature conveyor rollers at steel and heat-treatment plants. 

 

Creep resistance of LAWAI’s HP-Mod (HP-Nb) tubes

HP-Mod(HP-Nb) tubes have been developed at our foundry.  The min. OD we could reach is 50 mm now. 

In order to make sure the creep resistance of our HP-Mod (HP-Nb) tubes are able to meet the general standards of petrochemical plants.  We did the comparison among the data of our tubes, Manaurite XM of MANOIR INDUSTRIES tubes.

In the graph below, it showed that our tubes are able to be compared with the tubes provided from MANIOR.  In order to prove the stability of our HP-Mod (HP-Nb) tubes, we will do further tests of creep resistance to ensure the strength that meets the standards. 

 

 Lason-Miller Plot of Manaurite-XM, LAWAI HP-Mod tube

 

P.S. The Larson-Miller approach is used to determine creep rupture time for any stress-temperature combination for a given material.