Custom Length Stainless Steel Seamless Pipe ASTM A312 304/304L Beveled End Seamless Steel Tube
Custom Length Stainless Steel Seamless Pipe ASTM A312 304/304L Beveled End Seamless Steel Tube
1.Product Description
This batch of stainless steel seamless pipes is supplied as ready-for-installation finished products per project drawings and Material Take-Off (MTO) lists. All pipes have undergone dimensional re-inspection, non-destructive testing, and surface cleaning at the mill. Ends are prepared with bevels (or plain ends) per welding procedure requirements and coated with a weldable end-protection layer. Each pipe is affixed with a waterproof label clearly indicating pipe number, material grade, size, heat/batch number, and installation zone code. On-site material verification is not required before proceeding directly to prefabrication and installation.
2. Product Applications
This batch of pipes is intended for direct one-time installation on site, covering the following specific construction scenarios:
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Ground-level prefabrication and elevated hoisting/laying of pipe-rack overhead lines
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Trench-laying and butt-welding of buried pipelines (with anti-corrosion field-joint coating coordination)
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Piping connections to equipment nozzles (pump suction/discharge, heat exchanger nozzles, tower connections)
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Pipe section connections in confined spaces (valve clusters, instrument fitting spool pieces)
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Temporary prefabrication of modular pipe spools (facilitating future overall replacement)
3. Product Advantages
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Zero on-site preparation: Pipes are cut to specified lengths and beveled at the factory. No cutting, chamfering, or grinding is required upon arrival, allowing immediate fit-up and saving approximately 30% of on-site fabrication man-hours.
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Anti-mistake pipe marking: Color codes (e.g., red = steam, blue = water, yellow = flammable media) are sprayed within 1m of each pipe end, complemented by QR code scan tracking linked to electronic records, eliminating on-site material misuse.
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High hoisting safety: Tight OD ovality ensures stable clamping by tongs or slings with balanced center of gravity, preventing slippage or swinging during overhead lifting.
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Convenient welding fit-up: Pipe end ovality ≤0.5% OD (cold-drawn); consistent bevel angle and land thickness allow easy control of root gap and misalignment, reducing welder difficulty and improving first-pass yield.
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Low-temperature applicability: Maintains sufficient toughness even at -5℃ to -20℃ ambient temperatures. Winter construction preheating requirements are lower than for equivalent welded pipes, reducing on-site heating equipment needs.
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Coating compatibility: External weldable rust-preventive primer ensures good adhesion with on-site epoxy/polyurethane field-joint coatings and insulation layers.
4.Key Product Parameters
| Inspection Item | Site Allowable Values / Operational Requirements |
| Pipe Storage | Elevated ≥300mm (moisture-proof); outdoor storage ≤7 days; end caps intact |
| Hoisting Method | Nylon slings/special pipe clamps; wire ropes strictly prohibited from direct pipe contact |
| End Bevel Inspection | Angle 37.5°±2.5°, land 1.0~2.0mm, bevel face free of scale and cracks |
| Fit-up Misalignment | Offset ≤10% of WT and ≤1.5mm; root gap 1.5~3.0mm |
| Interpass Temp (Austenitic) | ≤150℃ (manual) / ≤100℃ (automatic) |
| Welding Heat Input (manual) | ≤1.5 kJ/mm (recommended; per PQR shall prevail) |
| No PWHT (thin wall) | ≤10mm WT — PWHT may be waived; >10mm — perform solution/stabilizing per design |
| Hardness Check (spot test) | Weld joint ≤220HV10 (austenitic); base metal ≤187HB |
| Hydrostatic Test Pressure | 1.5 × design pressure (but ≥0.6MPa), hold ≥10 minutes |
| Hydrostatic Test Water Temp | ≥5℃; chloride content ≤25ppm (to avoid SCC) |
| Leak/Pneumatic Test | Air at 0.6MPa, neutral soap solution applied; hold 5 minutes with no bubbles |
| As-built Handover Documents On-site | MTC copies, NDT reports for each weld joint (RT/UT/PT), hydrotest records, welder qualification copies |
FAQ
1. Are you trading company or manufacturer ? We are manufacturer ,You can see the certification.
2.How long is your delivery time? Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
3. Do you provide samples ? is it free or extra ? Yes, we could offer the sample for free charge but need pay the cost of freight.
4. What is your terms of payment ? Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.
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