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Hexagon Head Bolt Chinese Factory
QS Fastener: Hexagon Head Bolt Chinese Factory
Name: Hexagon Head Bolt Chinese Factory
Material: Inconel 625
Size: 1/2 to 4 inch
Length: 30 to 800 mm
Standard: UNS, DIN, BSW, NF
Hardness: 220 HB
Feature: Excellent Corrosion Resistance, Certified to NACE standard by the American Society of Corrosion Engineers
Application: For Chemical process industries and Ssituations in Contact with Seawater and Subjected to High Mechanical Stress
Price: USD 59.9 - 109/ Kg
MOQ: 10 kg
Customization: yes
Delivery time: 7-30 Day
Material: Inconel 625
Size: 1/2 to 4 inch
Length: 30 to 800 mm
Standard: UNS, DIN, BSW, NF
Hardness: 220 HB
Feature: Excellent Corrosion Resistance, Certified to NACE standard by the American Society of Corrosion Engineers
Application: For Chemical process industries and Ssituations in Contact with Seawater and Subjected to High Mechanical Stress
Price: USD 59.9 - 109/ Kg
MOQ: 10 kg
Customization: yes
Delivery time: 7-30 Day
Quantity
Produced in a specialized Chinese factory with rigorous quality control, this Hexagon Head Bolt is forged from Inconel 625 (NF NC22DNb) to serve critical connections in chemical processing, offshore platforms, and seawater-handling systems. Available in diameters from ½ to 4 inches and lengths ranging 30–800 mm, the bolt covers a broad spectrum of heavy-duty flange and structural joints. It complies with UNS, DIN, BSW, and NF standards, with a maximum hardness of 220 HB to ensure adequate ductility while maintaining high strength.
The defining advantage lies in its corrosion behavior under extreme chloride exposure. In static seawater, the uniform corrosion rate stays below 0.01 mm/year – negligible for long-term service. Its pitting potential (Epit) in 3.5% NaCl solution reaches +0.5 V (vs. SCE), far exceeding that of 316L or duplex steels, which means the passive film remains intact even when local pH drops. For crevice conditions, the critical crevice corrosion temperature (CCT) exceeds 100°C, making this Hexagon Head Bolt suitable for heat exchangers and submerged flanges where stagnant zones accelerate attack.
Under high-flow seawater (5 m/s, 25°C, 6-month natural seawater test), the measured corrosion rate is below 0.02 mm/year – no significant erosion-corrosion or impact wear was observed. This performance is attributed to the synergistic effect of Ni (≥58%), Cr (20–23%), and Mo (8–10%), which stabilizes the oxide layer against both velocity-induced thinning and particle abrasion.
Practical field data from offshore fastener applications confirm that this Hexagon Head Bolt sustains preload retention and thread integrity after 5+ years in splash zones. It is also NACE MR0175 certified, ensuring hydrogen-induced cracking resistance for sour-service environments occasionally encountered in produced water systems.
Priced at USD 59.9–109/kg with a low MOQ of 10 kg, custom lengths and coatings are available, and delivery spans 7–30 days. For engineers specifying bolting in desalination pumps, propeller shafts, or riser clamps, this product offers a proven balance of cost, availability, and metallurgical reliability – backed by a Chinese factory that understands both Western standards and Asian supply chain efficiency.
FAQ
Q1: What is the maximum service temperature for this Hexagon Head Bolt in seawater?
A: Continuous use up to 650°C in air; in seawater, the CCT >100°C makes it safe for high-temperature brine up to 300°C with proper design.
Q1: What is the maximum service temperature for this Hexagon Head Bolt in seawater?
A: Continuous use up to 650°C in air; in seawater, the CCT >100°C makes it safe for high-temperature brine up to 300°C with proper design.
Q2: Does the Chinese factory provide material test reports (MTR) with each batch?
A: Yes, every lot includes MTR, PMI check, and NACE compliance certificate per MR0175.
A: Yes, every lot includes MTR, PMI check, and NACE compliance certificate per MR0175.
Q3: Can this bolt replace ASTM A193 B7 in offshore applications?
A: Yes, but with far superior pitting and crevice resistance – however, strength grade is lower (approx. 690 MPa yield), so redesign may be needed.
A: Yes, but with far superior pitting and crevice resistance – however, strength grade is lower (approx. 690 MPa yield), so redesign may be needed.
Q4: Is the MOQ flexible for trial orders?
A: The factory accepts 10 kg as standard MOQ; samples of 2–5 kg can be negotiated for qualification testing.
A: The factory accepts 10 kg as standard MOQ; samples of 2–5 kg can be negotiated for qualification testing.
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