| Water transmission and general construction | ASTM A53 / ASME SA53 | ERW, black or galvanized | DN25–DN600
(1–24 in) | Grade B | $720–$1,080 | 20–35 days after deposit or order confirmation | FOB or CFR for export orders | 20–25 metric tons | 20%–30% deposit; balance against shipping documents or before dispatch | Confirm outside diameter, wall thickness, length tolerance, coating thickness, hydrostatic test, and mill test certificate requirements. |
| Structural columns and mechanical fabrication | ASTM A500 / A500M | Cold-formed welded square, rectangular, or round tube | 20 × 20 mm to 500 × 500 mm | Grade B or Grade C | $760–$1,150 | 25–40 days | FCA, FOB, or delivered-to-site quotation | 10–20 metric tons | Letter of credit at sight or staged payment linked to inspection | Request corner radius, section tolerance, straightness, yield strength, tensile strength, and welding quality documentation. |
| Oil, gas, and water pipeline service | API Specification 5L | Seamless or longitudinally welded line pipe | DN50–DN900
(2–36 in) | Grade B, X42, or X52 | $850–$1,350 | 35–60 days | CFR, CIF, or DAP depending on destination | 25–50 metric tons | 30% deposit with balance after third-party inspection or irrevocable L/C at sight | Specify PSL1 or PSL2, pipe end condition, bevel dimensions, hydrostatic testing, traceability, NDT, coating, and marking requirements. |
| Low-pressure steam, air, and process piping | ASTM A106 / ASME SA106 | Seamless hot-finished pipe | DN15–DN400
(1/2–16 in) | Grade B | $980–$1,550 | 35–55 days | FOB, CFR, or CIF | 10–25 metric tons | 20%–30% deposit; balance after document review and pre-shipment inspection | Check seamless manufacturing route, heat treatment, chemical composition, tensile properties, hydrostatic test, and dimensional inspection. |
| Boiler and heat-exchanger service | ASTM A179 / A192 | Seamless carbon steel tube | Outside diameter 12.7–76.2 mm | Low-carbon steel | $1,150–$1,850 | 40–65 days | CIF or DAP with moisture-resistant packing | 5–15 metric tons | Letter of credit at sight or payment against approved inspection documents | Confirm tube length, wall thickness, hardness, flattening test, flaring test, eddy-current or hydrostatic testing, and internal cleanliness. |
| Galvanized fire-protection and utility systems | ASTM A53 with applicable coating requirements | Hot-dip galvanized ERW pipe | DN15–DN300
(1/2–12 in) | Grade A or Grade B | $900–$1,380 | 25–45 days, including galvanizing | FOB, CFR, or CIF | 20 metric tons | 30% deposit; balance after coating inspection and final packing approval | Specify zinc coating mass or thickness, thread and groove details, sealing of pipe ends, corrosion protection, and packaging method. |
| Large-diameter water and slurry pipelines | AWWA C200 or project-specific specification | Spiral-welded or longitudinally welded pipe | DN600–DN2,400
(24–96 in) | Project-specific carbon steel grade | $780–$1,250 | 45–75 days | CFR, CIF, or DAP to the project location | 50–100 metric tons | Milestone payments tied to material approval, production, inspection, and shipment | Approve weld procedure, plate or coil traceability, joint design, internal and external coating, field-joint coating, and lifting requirements. |
| Small repair, maintenance, and fabrication orders | ASTM A53, ASTM A106, or equivalent national standard | Seamless or ERW, depending on service | DN15–DN150
(1/2–6 in) | Grade B | $1,050–$1,900 | 7–20 days if stocked; otherwise 25–45 days | EXW, FCA, or courier delivery for small quantities | 1–5 metric tons, subject to stock availability | Payment before shipment for small stock orders; credit terms may require approval | Verify actual stock, heat numbers, remaining shelf condition, cut-length charges, rust protection, and availability of certificates. |
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