Material Specifications & International Equivalents

As a specialized manganese-boron steel grade within the German DIN system, 34MnB5 seamless tubes maintain precise correspondence with international standards including:

  • China: 30MnB5 alloy structural steel (GB/T 3077)

  • United States: 15B35H (ASTM standards, boron-alloyed steel)

  • Japan: SMn433B (JIS G4053)

  • Europe: X35MnB5 (EN standards)

The designation "34" represents approximately 0.34% carbon content, "Mn" indicates manganese as the primary strengthening element, "B" denotes boron micro-alloying, and "5" identifies the material sequence number, clearly defining its manganese-boron composite alloy characteristics for cost-effective high-strength applications.

Mechanical Properties & Performance Characteristics

These heat-treatable alloy tubes demonstrate excellent mechanical capabilities in annealed condition with tensile strength ≥600MPa, yield strength ≥350MPa, and elongation ≥15%. Through proper quenching and tempering processes, the mechanical properties can be significantly enhanced to achieve tensile strength of 800-1000MPa and hardness reaching HRC28-38, providing fatigue resistance comparable to 40Cr grade while maintaining cost advantages.

The enhanced processing characteristics include excellent hardenability through boron micro-alloying, suitable for through-hardening of medium cross-sectional components. Good machinability after annealing and strong response to heat treatment enable significant performance improvement after quenching and tempering processes. Welding requires preheating to 150-250°C with controlled cooling to prevent cold cracking.

Technical Advantages:

  ◆ Outstanding cost-performance ratio (10%-15% lower cost than 40Cr and 42CrMo)

  ◆ Balanced strength and fatigue resistance

  ◆ Excellent hardenability through boron micro-alloying

  ◆ Good wear resistance for conventional mechanical applications

  ◆ Suitable for medium-to-heavy duty applications with budget considerations

Applications & Industrial Solutions

34MnB5 alloy seamless tubes serve various applications across multiple sectors requiring high strength and cost efficiency:

Mechanical Manufacturing

  • Transmission shafts and gear shafts

  • Connecting rods and crankshafts

  • High-strength fasteners (bolts, nuts)

  • Universal joints and machine tool gears

Medium-to-heavy duty components requiring reliability

Automotive Industry

  • Automotive axle shafts and steering knuckles

  • Suspension arms and transmission gears

  • Brake system heavy-duty components

  • Automotive applications balancing performance and cost

Engineering Machinery

  • Hydraulic supports for excavators and loaders

  • Pin shafts and transmission structural components

  • Heavy equipment parts requiring wear and deformation resistance

General Machinery

  • Mining machinery components

  • Agricultural machinery heavy-duty parts

  • Conveyor machinery transmission shafts

  • Industrial applications with budget sensitivity

Replacement Scenarios

  • Alternative to 40Cr, 41Cr4 chromium-alloy steels

  • Medium cross-section applications under non-extreme conditions

  • Cost-effective substitution without compromising performance

Customization & Delivery Options

34MnB5 tubes are typically supplied in annealed condition (GBK/+A) to facilitate subsequent machining and welding operations. The recommended delivery condition is quenched & tempered (Q&T) providing pre-enhanced high-strength properties that reduce customer heat treatment requirements. Precision applications can be served with stress-relieved condition (BKS/+SR) to ensure dimensional stability during precision machining and meet requirements for machine tool processing and precision assembly. Tenjan's manufacturing flexibility enables customized solutions in dimensions, surface quality, and mechanical properties to meet specific application requirements.

Tenjan Advantage & Quality Commitment

Supported by 21 years of specialized experience in alloy steel tube manufacturing and comprehensive production capabilities, Tenjan delivers reliable 34MnB5 tubular solutions through advanced quality management systems and technical expertise. Our custom alloy steel capability enables production of various domestic and international alloy steel grades tailored to your specific application requirements, including specialized manganese-boron alloys for cost-effective high-strength applications. With full-process manufacturing control and professional technical support, we ensure consistent material quality and performance reliability while maintaining competitive pricing. Our flexible order quantities and responsive customer service guarantee seamless project integration and ongoing technical support throughout your operation lifecycle, maintaining our commitment to delivering high-performance alloy solutions that optimize both performance and cost efficiency for your most demanding operational requirements.