4140 Seamless Steel Oil Well Drilling Pipe with High Straightness and Quenched & Tempered for Durability

• Exceptional Mechanical Strength for Extreme Conditions
  • Tensile Strength: ≥950 MPa (Superior resistance to burst and collapse under ultra-high downhole pressures)
  • Yield Strength: ≥850 MPa (Maintains structural integrity under heavy loads, preventing deformation)
• Optimized Hardness for Enhanced Wear Resistance (28-33 HRC)
  • Hardened surface (quenched & tempered) delivers superior abrasion resistance
  • Controlled hardness range ensures balance between toughness and durability
• Reliable Performance via Quenching & Tempering (QT Process)
  • QT delivery condition refines microstructure, eliminating internal stresses
  • Delivers consistent mechanical properties across the entire pipe length
• Superior Fatigue & Impact Resistance
  • High-strength Cr-Mo alloy base improves cyclic load resistance
  • Maintains impact toughness even at elevated hardness levels
• Proven Alloy Composition (4140 Steel)
  • Chromium (0.80-1.10%) enhances corrosion resistance
  • Molybdenum (0.15-0.25%) boosts high-temperature stability
  • Excellent weldability with proper pre/post-weld heat treatment
• Ideal for Demanding Applications
  • Deep drilling, HPHT wells, and abrasive formations
  • Heavy-duty casing/tubing requiring long-term durability

• Ultimate Strength - Outperforms standard grades with higher tensile/yield values
• Longer Service Life - Hardness and wear resistance minimize downtime
• Engineered Reliability - QT process ensures consistent performance
• Global Compliance - Meets/exceeds API and industry standards

Fore poling (advance support), mine blasting, water well drilling, geothermal well drilling, and coal/nonferrous metal mining.

• Stress Relief Annealing after Cold Working (+SR) (BKS)
• Normalizing (+N) (NBK)
• Quenching & Tempering (QT)

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