GB 9948 Carbon Steel Seamless Steel Pipe For Petroleum Cracking

Instruction

GB 9948 Carbon Steel Seamless Steel Pipe For Petroleum Cracking

 

Material Overview
GB 9948 is a Chinese standard for carbon steel seamless steel pipes used in petroleum cracking applications. These pipes are designed to withstand high-temperature and high-pressure conditions, making them suitable for various industries involved in petroleum processing. Below is an overview of the material specifications and characteristics.

 

Specifications

Standard	Outer Diameter (mm)	Wall Thickness (mm)	Length (mm)
GB 9948	21.3 - 610	2.0 - 30	4000 - 16000

 

Chemical Composition
The chemical composition of GB 9948 carbon steel seamless steel pipes for petroleum cracking is as follows:

Element	C (%)	Si (%)	Mn (%)	P (%)	S (%)
Composition (%)	0.07-0.13	0.17-0.37	0.35-0.65	≤0.030	≤0.030

 

Mechanical Properties
The mechanical properties of GB 9948 carbon steel seamless steel pipes are vital in ensuring their integrity and performance under demanding conditions.

Tensile Strength (Mpa)	Yield Strength (Mpa)	Elongation (%)	Hardness (HRC)
≥ 410	≥ 245	≥ 25	≤ 88.5

 

Steel Grade
The steel grade used in GB 9948 carbon steel seamless steel pipes for petroleum cracking is 20#, which indicates a carbon content of around 0.20%.

 

Application
GB 9948 carbon steel seamless steel pipes find their primary application in the field of petroleum cracking. Petroleum cracking is a process used in refineries to convert large hydrocarbons into valuable products like gasoline, diesel, and other petrochemicals. These pipes are integral to the efficient transportation of the cracked hydrocarbons at high temperatures and pressures throughout the refining process.