GB 18248 Seamless Cylinder Steel Tube

Material and Specification

The GB 18248 Seamless Cylinder Steel Tube is a high-quality steel tube designed for various industrial applications. It conforms to the specifications outlined in GB 18248, ensuring reliability and performance in demanding environments.

Key Features

Seamless construction for enhanced strength and durability.

Precise dimensional accuracy for seamless integration.

High corrosion resistance for prolonged service life.

Excellent weldability for ease of fabrication.

Consistent mechanical properties for reliable performance.

Chemical Composition

Element	Composition (%)
C (Carbon)	0.20 max
Si (Silicon)	0.15-0.35
Mn (Manganese)	0.40-1.20
P (Phosphorus)	0.030 max
S (Sulfur)	0.025 max

Mechanical Properties

Property	Value
Tensile Strength	610 MPa min
Yield Strength	350 MPa min
Elongation	20% min
Impact Toughness	27 J min
Hardness	170-220 HB

Physical Properties

Property	Value
Density	7.85 g/cm³
Melting Point	1420-1460°C
Thermal Conductivity	52.9 W/(m·K)
Specific Heat	0.46 J/(g·K)

Process Performance

Property	Performance
Machinability	Excellent
Weldability	High
Formability	Good
Corrosion Resistance	Excellent

Steel Grade

The GB 18248 Seamless Cylinder Steel Tube is available in various steel grades, including but not limited to:

37Mn

34Mn2V

30CrMo

35CrMo

Application

The GB 18248 Seamless Cylinder Steel Tube finds wide application in industries such as:

Automotive manufacturing

Aerospace

Machinery

Oil and gas exploration

Hydraulic systems

Possible Alternative Grades

While GB 18248 Seamless Cylinder Steel Tube offers exceptional performance, alternative grades may be considered based on specific requirements. Some possible alternatives include:

ASTM A519 Grade 4130

DIN 2391 St52

JIS G3429 STH11

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