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    In the latest vendor rating, TOBO won the excellent rating, it is good, will continue to cooperate.
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NACE MR0175 Stainless Steel Seamless Pipe 316L Seamless Tube SCH80 Oil & Gas Industry Pipe

  • NACE MR0175 Stainless Steel Seamless Pipe 316L Seamless Tube SCH80 Oil & Gas Industry Pipe
  • NACE MR0175 Stainless Steel Seamless Pipe 316L Seamless Tube SCH80 Oil & Gas Industry Pipe
  • NACE MR0175 Stainless Steel Seamless Pipe 316L Seamless Tube SCH80 Oil & Gas Industry Pipe
  • NACE MR0175 Stainless Steel Seamless Pipe 316L Seamless Tube SCH80 Oil & Gas Industry Pipe
  • NACE MR0175 Stainless Steel Seamless Pipe 316L Seamless Tube SCH80 Oil & Gas Industry Pipe
Place of Origin Shanghai,China
Brand Name TOBO
Certification ISO/TUV/SGS
Model Number Stainless Steel Seamless Pipe
Minimum Order Quantity 1PC
Price Negotiable
Packaging Details Standard Shipping Package
Delivery Time 15-30 Workdays
Payment Terms T/T,Western Union
Supply Ability 10 Ton/Month
Product Details
Product Name NACE MR0175 Stainless Steel Seamless Pipe 316L Seamless Tube SCH80 Oil & Gas Industry Pipe Tech Cold Drawn
Surfacefinish Polished, Pickled, Or Mill Finish Processing Technology Hot Rolled
Origin Wenzhou Length Of Pipe 2-18meter
Supply Capacity 10000tons Material Grade TP304,TP316L,TP310,TP347
Ndt HT/ET/UT/RT Corrosionresistance High Corrosion Resistance
Stock Availability Regular Sizes In Stock For Fast Delivery Material Type Martensitic Stainless Steel
Keywords Carton Steel Pipe Certifications ISO/EN 10204 Type 3.1 / 3.2 Available
Product Type Pipe
High Light Pipe
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Product Description

NACE MR0175 Stainless Steel Seamless Pipe 316L Seamless Tube SCH80 Oil & Gas Industry Pipe

 

1.Product Description

This document provides full-process technical guidance for welding and joining of stainless steel seamless pipes, covering everything from base metal weldability assessment to post-weld quality inspection. Due to the absence of longitudinal welds, uniform microstructure, and stable chemical composition, seamless pipes exhibit reduced grain growth tendency in the heat-affected zone (HAZ) under welding thermal cycles, with controllable precipitation kinetics of secondary phases (e.g., σ-phase, chromium carbides). This guide covers the welding characteristics of four material categories: austenitic (304/316 series), stabilized (321/347), duplex (2205/2507), and super-austenitic (904L). Recommended parameters are provided for four common welding processes: Shielded Metal Arc Welding (SMAW), Gas Tungsten Arc Welding (GTAW/TIG), Gas Metal Arc Welding (GMAW/MIG), and Submerged Arc Welding (SAW). This document may also serve as a reference basis for preparing Welding Procedure Specifications (WPS) and Welding Procedure Qualification Records (PQR).

 

2. Product Applications

This welding guide is applicable to the following on-site and shop pipe joining operations:

  • On-site fit-up welding of new pipelines (fixed-position, rolled, and all-position welding)

  • Shop butt-welding of pipe spools and fillet welding of flanges/fittings

  • Localized replacement pipe welding and overlay cladding repair during emergency maintenance

  • Transition joints for dissimilar metals (e.g., austenitic-to-duplex, stainless-to-carbon steel)

  • Automatic TIG (hot-wire) welding for thin-wall pipes (≤3mm) and narrow-gap SAW for thick-wall pipes (≥20mm)

  • Applications requiring stringent weld joint toughness and corrosion resistance under cryogenic, high-temperature, or strongly corrosive services

3. Product Advantages

  1. Low hot-cracking susceptibility: The high purity of seamless pipes (S and P ≤ 0.015%) minimizes eutectic phases at grain boundaries, providing superior resistance to hot cracking during solidification compared to ordinary welded pipes. This allows a wider heat input window, reducing on-site operational difficulty.

  2. HAZ microstructural stability: With no prior weld thermal cycling history, the base metal has a uniform grain size (ASTM 5~7). During multi-pass welding, HAZ recrystallization and grain coarsening are approximately 30% less severe than in welded pipes of the same grade, ensuring joint impact toughness.

  3. Excellent back-purge protection: The smooth internal surface without weld reinforcement allows precise control of argon flow rate and coverage, minimizing oxidation on the root bead with a clean appearance, eliminating the need for back-gouging.

  4. Controlled welding deformation: Tight wall thickness tolerances (±8%~±10%) and uniform circumferential rigidity keep angular distortion and ovality changes within allowable limits, particularly favorable for automatic welding tracking systems.

  5. Retained intergranular corrosion resistance: Stabilized grades (321/347) with uniformly distributed Ti/Nb effectively fix carbon after thermal cycles, ensuring post-weld intergranular corrosion resistance comparable to the base metal.

  6. Dissimilar metal welding adaptability: For duplex-to-austenitic joints, the narrow chemical composition window of seamless pipes facilitates optimal weld metal phase balance (austenite/ferrite ratio), reducing intermetallic phase precipitation risks.

​NACE MR0175 Stainless Steel Seamless Pipe 316L Seamless Tube SCH80 Oil & Gas Industry Pipe

4.​Key Product Parameters

Base Metal Grade Welding Process Recommended Filler Metal (Grade) Preheating Temp (℃) Interpass Temp (℃) Heat Input (kJ/mm) Shielding Gas (Flow L/min) Post-Weld Heat Treatment (for WT>10mm)
304 / 304L GTAW(TIG) ER308 / ER308L Not required (preheat to 15 if ambient <10℃) ≤150 0.8~1.5 Pure Ar (8~12) Not necessary (if sensitization risk high, solution treat at 1050℃×1h)
304 / 304L SMAW E308 / E308L-16 Not required ≤150 1.0~2.0 — (coated electrode) Same as above
316 / 316L GTAW(TIG) ER316 / ER316L Not required (preheat to 20 if ambient <10℃) ≤150 0.8~1.5 Ar+2%N₂ (8~12) Not necessary (if sensitization risk high, solution treat at 1050℃×1h)
316 / 316L SMAW E316 / E316L-16 Not required ≤150 1.0~2.0 — Same as above
321 GTAW(TIG) ER321 Not required ≤150 0.8~1.5 Pure Ar (8~12) Stabilizing treatment: 870~930℃×2h, slow cool
321 SMAW E347-16 (or E321) Not required ≤150 1.0~2.0 — Stabilizing treatment as above
347H GTAW(TIG) ER347 100~150 (to prevent reheat cracking) ≤200 1.0~1.8 Pure Ar (8~12) Stabilizing treatment: 900~950℃×2h, slow cool
347H SMAW E347-16 100~150 ≤200 1.2~2.2 — Stabilizing treatment as above
2205 (Duplex) GTAW(TIG) ER2209 ≥50 (preheat to 80 if <10℃) ≤150 (recommended ≤100) 0.5~1.2 Ar+2%N₂ (10~15) Not necessary (stress relief at 650~700℃×1h possible, but avoid σ-phase)
2205 (Duplex) SMAW E2209-17 ≥50 ≤150 0.8~1.5 — Same as above
2507 (Super Duplex) GTAW(TIG) ER2507 / ERNiCrMo-13 80~120 ≤150 0.5~1.0 Ar+2%N₂ (10~15) Not necessary (stress relief at 650℃×1h with controlled cooling)
904L (Super Austenitic) GTAW(TIG) ER385 (or ERNiCrMo-3) Not required ≤150 0.8~1.5 Ar + small N₂ (8~12) Not necessary (solution treat at 1100℃×1h, water quench if needed)
904L SMAW E385-16 Not required ≤150 1.0~2.0 — Same as above
Dissimilar (e.g., 316L+2205) GTAW(TIG) ER2209 or ERNiCrMo-3 (Ni-based transition) 50~80 ≤150 0.8~1.2 Ar+2%N₂ (10~15) Per higher-grade requirement, usually not necessary
Dissimilar (e.g., 304L+C.S.) SMAW E309L-16 (stainless transition) or ENiCrFe-3 Per carbon steel side (≥100) ≤200 (SS side ≤150) 1.2~2.0 — Per carbon steel side, but avoid prolonged stay in SS sensitization range (450~850℃)

 

 

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.

Tags:

seamless stainless steel tube

marine stainless steel tubing

stainless steel round tube