Material and Specification

The GB/T 33821 34MnB5 carbon steel pipe is a type of seamless steel pipe designed according to the Chinese national standard. It is characterized by its high strength and good plasticity, making it suitable for various industrial applications.

Key Features

High strength

Good plasticity

Seamless construction for enhanced durability

Precision engineering to meet specific performance requirements

Chemical Composition

Element	Composition (%)
Carbon (C)	0.32 - 0.39
Silicon (Si)	0.17 - 0.37
Manganese (Mn)	1.15 - 1.45
Phosphorus (P)	≤ 0.035
Sulfur (S)	≤ 0.035
Boron (B)	0.0008 - 0.004

Mechanical Properties

Property	Value
Yield Strength	≥ 800 MPa
Tensile Strength	1000 - 1200 MPa
Elongation	≥ 10%
Hardness (HB)	320 - 360 HB

Physical Properties

Property	Value
Density	7.85 g/cm³
Thermal Conductivity	46.6 W/(m·K)
Specific Heat	0.475 J/g·K

Process Performance

Property	Value
Weldability	Good
Machinability	Fair
Formability	Excellent
Hardenability	High

Steel Grade

20Mn2B 25MnCrAITiB 34MnB5

Application

The GB/T 33821 34MnB5 carbon steel pipe is commonly used in various industrial applications including:

Manufacturing of high-strength components

Construction of machinery and equipment

Automotive industry (e.g., for chassis and structural components)

Possible Alternative Grades

ASTM A519 Grade 4140

EN 10297-1 34CrMo4

JIS G3441 SCM435

This information provides a comprehensive overview of the GB/T 33821 34MnB5 carbon steel pipe, highlighting its composition, mechanical properties, and potential applications in various industries.

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