1. Hot rolled seamless steel pipe
Hot rolling refers to heating the steel billet to an appropriate temperature and forming a seamless steel pipe through continuous casting and rolling. Hot-rolled seamless steel pipe has the characteristics of high strength, good plasticity and welding performance due to the perfect plastic deformation of the grains inside the steel pipe after multiple rolling processes. In terms of delivery status, hot-rolled seamless steel pipes are divided into three states: black skin, smooth skin and grinding skin. Black skin is the state without surface treatment, smooth skin is the state after surface treatment, and grinding skin is the state. High temperature polished state.
2. Heat-treated seamless steel pipe
Heat treatment of seamless steel pipe refers to heating, insulation and cooling of seamless steel pipe so that it has certain mechanical and physical properties. The delivery state of heat-treated seamless steel pipes is usually annealed or normalized. The annealing state refers to heating the steel pipe to a certain temperature, holding it for a period of time, and then slowly cooling it to room temperature; the normalizing state refers to heating the steel pipe to a certain temperature, holding it for a period of time, and then water-cooling or oil-cooling it to make it have a higher strength and hardness.
3. The difference between hot-rolled and heat-treated seamless steel pipes
Hot rolling and heat treatment are two different processes in the production of seamless steel pipes, and the delivery status also has certain differences. Hot-rolled seamless steel pipe has good plasticity, welding performance and high strength, and is suitable for some pressure resistance, heat resistance, corrosion resistance and other fields. Heat-treated seamless steel pipes have higher hardness, strength and other mechanical properties after annealing or normalizing treatment, and are suitable for engineering fields that need to withstand higher pressures and heavy loads.
In short, when selecting seamless steel pipes, the selection should be based on actual use needs and the delivery status of seamless steel pipes. At the same time, pay attention to purchasing products produced by regular manufacturers to ensure that their quality and performance meet the requirements.

Standard: ASTM SA106	Alloy Or Not: Not
Grade Group: GR.A,GR.B,GR.C Etc	Application: Fluid Pipe
Thickness: 1 - 100 Mm	Surface Treatment: As Customer's Requirement
Outer Diameter(Round): 10 - 1000 Mm	Technique: Hot Rolled
Length: Fixed Length Or Random Length	Heat Treatment: Annealing/Normalizing
Section Shape: Round	Special Pipe: High Temperature
Place Of Origin: China	Usage: Construction, Fluid Transportation
Certification: ISO9001:2008	Test: ECT/CNV/NDT

 

Standard: ASTM SA 213	Alloy Or Not: Alloy
Grade Group: T5,T9,T11,T22 Etc	Application: Boiler Pipe/ Heat Exchanger Pipe
Thickness: 0.4-12.7 Mm	Surface Treatment: As Customer's Requirement
Outer Diameter(Round): 3.2-127 Mm	Technique: Hot Rolled
Length: Fixed Length Or Random Length	Heat Treatment: Normalizing/Tempering/Annealing
Section Shape: Round	Special Pipe: Thick Wall Pipe
Place Of Origin: China	Usage: Super Heat, Boiler And Heat Exchanger
Certification: ISO9001:2008	Test: ECT/UT

 

Standard: API 5L	Alloy Or Not: Not Alloy,Carbon
Grade Group: Gr.B X42 X52 X60 X65 X70 Etc	Application: Line Pipe
Thickness: 1 - 100 Mm	Surface Treatment: As Customer's Requirement
Outer Diameter(Round): 10 - 1000 Mm	Technique: Hot Rolled
Length: Fixed Length Or Random Length	Heat Treatment: Normalizing
Section Shape: Round	Special Pipe: PSL2 Or High Grade Pipe
Place Of Origin: China	Usage: Construction,Fluid Pipe
Certification: ISO9001:2008	Test: NDT/CNV

 

 

Standard: ASTM A335	Alloy Or Not: Alloy
Grade Group: P5,P9,P11,P22,P91, P92 Etc.	Application: Boiler Pipe
Thickness: 1 - 100 Mm	Surface Treatment: As Customer's Requirement
Outer Diameter(Round): 10 - 1000 Mm	Technique: Hot Rolled/ Cold Drawn
Length: Fixed Length Or Random Length	Heat Treatment: Annealing/Normalizing/Tempering
Section Shape: Round	Special Pipe: Thick Wall Pipe
Place Of Origin: China	Usage: High Pressure Steam Pipe, Boiler And Heat Exchanger
Certification: ISO9001:2008	Test: ET/UT