Material Specifications & International Equivalents

As a specialized carburizing-grade alloy steel within the SAE/ASTM system, 8620 seamless tubes maintain precise correspondence with international standards including:

  • China: 20CrNiMo alloy structural steel (GB/T 3077)

  • Germany: 20NiCrMo2-2 (DIN standards)

  • Japan: SNCM220 (JIS standards)

  • Europe: 1.6523 (EN standards)

The 8620H variant with guaranteed hardenability features stricter impurity control (P≤0.025%, S≤0.015%) and corresponds to 20CrNiMoH in Chinese GB/T 5216 standard, ensuring consistent through-hardening characteristics for critical applications requiring maximum performance reliability.

Mechanical Properties & Performance Characteristics

These case-hardening alloy tubes demonstrate excellent mechanical capabilities in annealed condition with tensile strength ≥500MPa, yield strength ≥330MPa, and elongation ≥25%. Through proper carburizing + quenching + low-temperature tempering processes, the surface hardness can achieve HRC58-62 with exceptional wear resistance while maintaining core hardness of HRC28-35 for reliable impact resistance.

The enhanced processing characteristics include superior machinability in annealed condition with minimal tool wear, good weldability with preheating to 150-200°C to prevent cracking, and excellent response to various carburizing processes including gas carburizing and vacuum carburizing. The optimized carburizing performance enables precise case depth control and uniform surface hardness distribution for consistent wear performance in demanding applications.

Technical Advantages:

  • Exceptional "hard surface + tough core" composite properties after carburizing

  • Superior wear resistance and contact fatigue strength

  • Excellent impact toughness with core impact values ≥78J/cm²

  • Reliable performance under high-frequency alternating loads and shock conditions

  • Consistent hardenability and heat treatment response

Applications & Industrial Solutions

8620 alloy seamless tubes serve critical applications across multiple heavy-duty sectors requiring superior wear resistance and impact durability:

Automotive Transmission Systems

  • Transmission gears and synchronizer rings

  • Drive shaft splines and steering gears

  • Automotive drivetrain components withstanding high loads and repeated impact

Heavy Machinery Applications

  • Construction equipment gear systems

  • Mining machinery transmission components

  • Heavy equipment parts requiring wear resistance and durability

Precision Machinery Components

  • High-precision bearing rings and gear systems

  • Hydraulic pump gears and valve components

  • Precision engineering applications demanding dimensional stability

General Engineering Applications

  • Industrial gearbox systems and power transmission components

  • Equipment requiring carburized surface properties

  • General mechanical applications needing wear resistance

Customization & Delivery Options

8620 tubes are typically supplied in annealed condition (GBK/+A) to facilitate subsequent machining and carburizing operations. For applications requiring enhanced dimensional stability, we provide stress-relieved condition (BKS/+SR) with straightness within 0.5mm/m. The 8620H variant is available with guaranteed hardenability testing to ensure consistent through-hardening performance in critical applications.

Tenjan Advantage & Quality Commitment

Supported by 21 years of specialized experience in alloy steel tube manufacturing and comprehensive production capabilities, Tenjan delivers reliable 8620 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 including specialized carburizing alloys tailored to your specific application requirements. With full-process manufacturing control and professional technical support, we ensure consistent material quality and performance reliability for your most demanding carburizing applications. 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 exceed customer expectations for wear resistance, impact durability, and reliability in challenging operational environments.