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SCM440 Chromium-Molybdenum Alloy Seamless Steel Tubes are Japanese JIS standard medium-carbon chromium-molybdenum steel tubes engineered for heavy-duty applications requiring exceptional strength, fatigue resistance, and high-temperature stability. These chromium-molybdenum alloy structural tubes feature a controlled carbon content of 0.38–0.43%, chromium levels of 0.90–1.20%, and molybdenum content of 0.15–0.30% . The synergistic effect of chromium and molybdenum ensures enhanced hardenability, wear resistance, and microstructural refinement, making SCM440 tubes ideal for high-stress environments in machinery, automotive, and petrochemical industries.
Material Specifications & International Equivalents
As a key chromium-molybdenum steel grade under the JIS G4053 standard , SCM440 seamless tubes correspond to the following international standards:
• China: 42CrMo (GB/T 3077)
• United States: 4140 (ASTM/SAE)
• Germany: 42CrMo4 (DIN)
• Europe: X42CrMo4 (EN)
The designation "SCM" signifies Structural Chromium-Molybdenum steel, while "440" identifies the grade series with ~0.40% carbon content .
Mechanical Properties & Performance Characteristics
• Annealed Condition: Tensile strength ≥650 MPa, yield strength ≥400 MPa, elongation ≥12% .
• Quenched & Tempered (Q&T) Condition: Tensile strength reaches 900–1100 MPa, hardness HRC 32–40 .
• High-Temperature Performance: Stable mechanical properties under 450°C, with exceptional creep and fatigue resistance .
Special Characteristics:
• Excellent for through-hardening of large sections .
• Good machinability (using carbide tools) and weldability (with preheating to 250–300°C) .
• Superior abrasion and deformation resistance under alternating loads .
Applications & Industrial Solutions
• SCM440 tubes are widely used in:
• Mechanical Manufacturing: Heavy-duty transmission shafts, gear shafts, high-strength fasteners, and machine tool spindles .
• Automotive Industry: Transmission gears, axle shafts, and engine components for Japanese high-end vehicles .
• Petrochemical & Engineering: High-pressure pipelines, hydraulic cylinders, and drilling equipment for temperatures ≤450°C .
• Specialized Applications: High-stress components in construction machinery, marine platforms, and localization of imported equipment .
Customization & Delivery Options
• Standard Delivery: Annealed (GBK/+A) for optimal machinability and weldability .
• Recommended Delivery: Quenched & Tempered (Q&T) for pre-hardened high-strength performance .
• Precision Applications: Stress-relieved (BKS/+SR) with straightness ≤0.5mm/m .
• High-Temperature Scenarios: Normalized (NBK/+N) for improved microstructural homogeneity .
Tenjan Advantage & Quality Commitment
With over 21 years of expertise in alloy steel tube manufacturing, Tenjan provides customized SCM440 solutions tailored to global standards. Our full-process quality control ensures material purity and performance reliability for extreme operating conditions. We support:
• Flexible order quantities (from 3 tons) and tailored dimensions/mechanical properties.
• Comprehensive technical guidance and post-sales service.
• Capability to produce SCM440 alloy tubes, SCM440 seamless pipes, and other international grades like 4140 and 42CrMo.
Tenjan guarantees seamless supply chain integration and lifelong technical support, empowering your projects with durable, high-performance chromium-molybdenum alloy tubes.
Custom Sizes OD10-108mm-ASTM/EN/DIN/JIS/GOST Certified-Small-Batch Friendly
| Parameter | Key Features |
| Outer Diameter | 10-108mm (0.39"-4.25") • Fully customizable |
| Wall Thickness | 1-20mm (0.039"-0.79") • ±0.1mm precision tolerance |
| Materials | Carbon Steel • Alloy Steel • Special grades available |
| Process | Cold Drawn & Cold Rolled for superior finish |
| Standard | Typical Grades We Supply |
| GB | 16Mn,Q345B(Q355B),Q345C(Q355C),Q345D(Q355D),Q345E(Q355E),Q420,Q460,20Cr,40Cr, 15CrMo,20CrMo,30CrMo,35CrMo, 42CrMo,20CrNiMo,40CrNiMo,20CrMnTi,20Mn2,40Mn2,40MnB,35MnB, 35Mn,15CrMn,20CrMn,20CrMnMo,38CrMoAL,36Mn2V,38Mn2V, 40MnMoV,15Mo3, 16Mo3,31CrMoV9 |
| ASTM | Gr·50,Gr·55,Gr·65,5120,5140,4130,4135,4140,8620,4340, SAE 5120,1524,1340,15B41,SAE5115,SAE 5120,SCM23 |
| EN/DIN | E355,ST52,S355JR,S355JO,S355J2,S355NL,S420N,S420NL,S460NL, 20Cr4,41Cr4,13CrMo4-5,20CrMo4,25CrMo4,34CrMo4,42CrMo4,20NiCrMo2,34CrNiMo6, 20MnCr5,22Mn6,42Mn6,42MnB4,34MnB5,37Mn5,16MnCr5,20CrMo5. |
| JIS | SCr22,SCr440,SCM415,SCM420,SCM430, SCM435,SCM440,SNCM220,SNCM439,SMnC420H,SMn420,SMn438,SMnC420H |
| GOST | 15Г2, 09Г2C/10Г2C1,15Г2,14Г2С,C355,20Х,40X,15XM,20ХМ,30ХМ,35ХМ, 38ХМ,20ХНМ,40ХНМ,20ХГТ,20Г2,40Г2,18ХГ,20ХГМ |
| Other Speical Grades can be customized | |
| Industry | Key Applications Parts | Relevant Standards | Our Advantages |
| Automotive and Motorcycle Component | Shock Absorbers,Steering Systems,Thrust Rods | EN 10305-1,JIS G3445, DIN 2391,ASTM A519 | High fatigue strength,High yield strength, lightweight, precision dimensions (±0.1mm) |
| Engineering and Mining Support | Anchor Bolts,Support Pipes,Hydraulic Props | ASTM A519,DIN 2391, JIS G3441,EN 10297-1 ISO 10799 | High Strength &Yield Strength&High Elongation Customization Service - Special steel grades,dimensions and surface treatments available according to project requirements |
| Construction Machinery | Drive shaft sleeves,Gearbox Guide Tubes,Crane Boom Guide Tubes,Excavator Arm Tubes,Loader Frame Tubes,Arctic Low-Temperature Tubes | ASTM A519,DIN 2391, JIS G3445,EN 10210-1, GOST 8733,ASTM A106, ISO 9329 | ID/OD tolerances of ±0.05mm.Wall thickness uniformity straightness ≤0.5mm/m |
| Fluid Transport Systems | Oil/Gas pipelines,chemical systems,Power/Energy | ASTM A106 Gr.B, EN 10216-2,GOST 8734 | Eddy Current + Ultrasonic Testing,Hydrostatic Testing |
| High-Pressure Boilers | Superheaters,Steam lines,Reheaters,Economizers) | ASTM A192,DIN 17175, EN 10216, JIS G3461/G3462 | Enhanced material density through cold-drawing/rolling ensures long-term stability Full Compliance with Int'l Standards,Superior Creep & Fatigue Resistance |
| Geological Drilling | Drill Pipe,Tubing | ASTM A519,API 5DP, EN 10208-2 | High Strength & Wear Resistance precision Dimensions Impact & Fatigue Resistance |
| Agricultural Machinery | Hydraulic cylinders,drive shafts,Lift arms, steering housings,Boom frames | ASTM A519,EN 10210-1, DIN 2391,GOST 8733, JIS G3445 | Material Advantages:High Strength & Lightweight,Precision Cold-Drawing Technology,Dimensional accuracy ±0.05mm |
| Petroleum Cracking Units | Reformer Tubes,Heat Exchanger Tubes,Reactor Feed Pipes,Transfer Lines,Quench Oil Pipes | ASTM A335,ASTM A213, EN 10216-2 | Optimized Material Purity,Precision Dimensional Control,Customized Solutions |
Tailored Features · Designed Exclusively for Your Needs
Precision-Engineered Alloy Steel Solutions-20% Cost Efficiency Certified Mill Partnerships:
Collaborating with Baosteel, Xingcheng, and Shagang to deliver:
✔ 100+ Custom Alloy Grades- Chemistry control (C, Cr, Ni, Mo adjustments)
✔ Engineered Mechanical Properties -Yield/Tensile strength customization
✔ Industrial-Grade QC-Full-spectrum testing (UT, hardness, dimensional)
✔ Verified 20% Cost Savings-Through optimized supply chain
Application:Oil & Gas, Automotive, Heavy Machinery, Energy
Extra-Long Piercing + Automated Normalizing Furnace – Precision Alloy Steel Tubes for High-Stress Applications Breakthrough Heating Technology:
Our extra-long piercing furnace ensures uniform heating, of alloy steel billets, eliminating defects like cracks, scaling, and eccentricity for superior tube integrity.p; for precision tubing.
Automated Normalizing Excellence:
✔ ±2°C Precision Control–Industry-leading temperature stability
✔ Enhanced Mechanical Properties–Optimized strength & fatigue resistance
✔ 100% Batch Consistency–Reliable performance for critical applications
Key Industries Served:Oil & Gas, Power Generation, Automotive, Geological Drilling, Mining Support and Construction
Ultra-Precision Tube Straightening – ≤0.5mm/m Tolerance for 30% Faster Machining Industry-Leading Straightening Technology:
Our proprietary system delivers ≤0.5mm/m straightness (4X tighter than standard), enabling:
✔ 30% Faster Machining–Minimizes lathe adjustment time
✔ Extended Tool Life –Reduces cutting tool wear by 20%
✔ Lower Production Costs –Less scrap & downtime
Technical Superiority:
Expert Operation – 20+ years master technicians
Automated QC – Real-time straightness monitoring
Custom Solutions– Optimized for alloy steel grades
Key Applications: Hydraulic Cylinders,Oil & Gas, High-Performance Automotive (drive shafts, suspension components)
Ultrasonic + Eddy Current Dual Testing - High-Reliability Inspection for Alloy Steel Tubes
Advanced NDT System Features:
✔ Ultrasonic Testing (UT)- Detects internal flaws down to 0.20mm
✔ Eddy Current (ET)- Identifies surface/subsurface defects
✔ Multi-Probe Technology- Complete ID/OD/wall coverage
Quality Assurance:
99.7% Detection Rate(Industry-proven reliability)
Dimensional Control- ±0.05mm OD tolerance
Material Verification- Full composition check
Certified Applications: Oil Gas, Energy, Automotive
Why settle for generic materials when we can align specifications directly to your application? By focusing on only what you need, we deliver superior cost efficiency without compromising quality—saving you time and resources.
Our surplus capacity acts as a safety net, eliminating risks of bottlenecks or missed deadlines—critical for projects with strict timelines.
• Advanced metalworking: Piercing, pickling, heat treatment & cold forming
• Precision verification: Dual NDT (Ultrasonic/Eddy Current) + material testing (Tensile/Chemical)
• 24/7 lab monitoring of 60+ parameters ensuring product consistency
IATF16949: Automotive-grade quality for precision parts.
TS (Pressure Pipe): Safety compliance for critical infrastructure (e.g., pipelines, boilers).
ISO9001: General excellence in process management.
Plus optional third-party validation (TÜV/SGS) for added credibility in regulated markets like aerospace, energy, or medical devices.
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