从China供应商批发进口Aisi 4137 Alloy Steel Tool Joint — FOB条款
Sourcing AISI 4137 Alloy Steel Tool Joint from Dongying Lake Petroleum Technology co.,ltd - China Import Guide
Before ordering, verify that the supplier’s API Spec 7-1 compliance includes third-party certification for the tool joint’s material and thread dimensions. Request mill test certificates (MTCs) for the AISI 4137 alloy, confirming chemical composition and mechanical properties match the project’s specifications. Check whether the phosphatizing or copper plating process meets additional client standards, such as NACE MR0175 for sour service environments.
Confirm logistics details, including the nearest port of loading (likely Qingdao or Tianjin for Dongying-based suppliers) and whether the supplier can arrange inland transport to the port. Lead times for custom tool joints can exceed 8 - 12 weeks, so factor this into project timelines. Clarify Incoterms; FOB or CFR are common for bulk shipments, but DDP may be negotiable for high-value orders. Payment terms typically require a 30% deposit, with the balance due prior to shipment.
Quality checks should include visual inspection of thread integrity and coating uniformity, followed by dimensional verification using API thread gauges. For critical applications, consider third-party inspection at the supplier’s facility or pre-shipment. Request documentation such as heat treatment charts, hardness test reports, and coating thickness measurements. Ensure the supplier provides a traceability system, with each joint marked with heat numbers and production dates for future audits.
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