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DIN 912 Hexagon Socket Head Cap Screw
QS Fastener: DIN 912 Hexagon Socket Head Cap Screw
Name: DIN 912 Hexagon Socket Head Cap Screw
Standard: DIN 912
Technical: Compliance with ANSI/NACE MR0175
Material: API 6ACRA N07718 120K
Hardness: 32-40 HRC
Size: M39
Pitch: 3 Pitch
Length: 140mm
Standard: DIN 912
Technical: Compliance with ANSI/NACE MR0175
Material: API 6ACRA N07718 120K
Hardness: 32-40 HRC
Size: M39
Pitch: 3 Pitch
Length: 140mm
Quantity
As a critical fastener in petroleum, natural gas, and marine engineering applications, surface treatment technology represents the core element for enhancing the performance of DIN 912 Hexagon Socket Head Cap Screw. Taking DIN 912 Hexagon Socket Head Cap Screw manufactured from API 6ACRA N07718 120K high-performance alloy as an example, scientific surface modification can significantly improve its fatigue strength, wear resistance, and corrosion resistance.
Shot peening serves as the most common mechanical strengthening method for DIN 912 Hexagon Socket Head Cap Screw. Using aluminum oxide or steel beads (200-400μm diameter) at 0.3-0.5MPa pressure for 10-15 minutes can increase the fatigue life of Screw by 30-50%. Particularly for M39×140mm specification DIN 912 Hexagon Socket Head Cap Screw, shot peening creates compressive stresses of -620MPa at 0.1mm depth, effectively inhibiting crack initiation. Warm Laser Peening (WLP) technology can further reduce stress relaxation rate to 36.7% at 700°C, making it the ideal choice for high-temperature applications of Screw.
Nitriding treatment can substantially enhance the surface properties of Screw. QPQ salt bath treatment (590-650°C/5h) achieves surface hardness of 1200HV0.1 for Screw, improving wear resistance by 400 times. Through solution treatment (1050°C) plus double aging (720°C/620°C), DIN 912 Hexagon Socket Head Cap Screw develops Fe2B and CrB strengthening phases, meeting ANSI/NACE MR0175 sulfide stress corrosion resistance requirements.
Special coating technologies provide comprehensive protection for DIN 912 Hexagon Socket Head Cap Screw:
- Electroplated nickel/chrome/gold (50-70°C/30-60min) improves corrosion resistance by 40%
- Electroless nickel plating (85-95°C/1-2h) achieves hardness ≥HV500
- Al-Si diffusion coating reduces high-temperature oxidation rate by 50%
These technologies ensure DIN 912 Hexagon Socket Head Cap Screw maintains excellent performance within 32-40HRC hardness range.
- Electroplated nickel/chrome/gold (50-70°C/30-60min) improves corrosion resistance by 40%
- Electroless nickel plating (85-95°C/1-2h) achieves hardness ≥HV500
- Al-Si diffusion coating reduces high-temperature oxidation rate by 50%
These technologies ensure DIN 912 Hexagon Socket Head Cap Screw maintains excellent performance within 32-40HRC hardness range.
Hydrogen embrittlement prevention measures for DIN 912 Hexagon Socket Head Cap Screw:
1. Post-plating dehydrogenation at 190-230°C for ≥4 hours
2. Low hydrogen permeability formulations for electroless plating
3. Hydrogen-free media for shot peening
1. Post-plating dehydrogenation at 190-230°C for ≥4 hours
2. Low hydrogen permeability formulations for electroless plating
3. Hydrogen-free media for shot peening
Through strict process control, DIN 912 Hexagon Socket Head Cap Screw can fully meet stringent requirements in petroleum, natural gas, and marine engineering applications.
As a professional fastener solution, DIN 912 Hexagon Socket Head Cap Screw demonstrates exceptional fastening security and long-term sealing performance in high-pressure, highly corrosive environments through optimized surface treatment technologies, making it the ideal choice for extreme operating conditions.
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