TOBO STEEL GROUP CHINA
| Length Of Pipe | 2-18meter |
| Keywords | Carton steel pipe |
| Payment Terms | T/T,Western Union |
| Tech | Cold Drawn |
| Processing Technology | Hot Rolled |
| Surfacefinish | Polished, Pickled, or Mill Finish |
| Supply Ability | 10 Ton/Month |
| Product Name | NACE MR0175 Stainless Steel Seamless Pipe 316L Seamless Tube SCH80 Oil & Gas Industry Pipe |
| Supply Capacity | 10000tons |
| Delivery Time | 15-30 Workdays |
| Origin | Wenzhou |
| Certifications | ISO/EN 10204 Type 3.1 / 3.2 available |
| High Light | pipe |
| Product Type | Pipe |
| Material Grade | TP304,TP316L,TP310,TP347 |
| Ndt | HT/ET/UT/RT |
| Corrosionresistance | High corrosion resistance |
| Packaging Details | Standard Shipping Package |
| Stock Availability | Regular Sizes In Stock for Fast Delivery |
| Material Type | Martensitic stainless steel |
| Model Number | Stainless Steel Seamless Pipe |
| Brand Name | TOBO |
| Certification | ISO/TUV/SGS |
| Place of Origin | Shanghai,China |
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Product Specification
| Length Of Pipe | 2-18meter | Keywords | Carton steel pipe |
| Payment Terms | T/T,Western Union | Tech | Cold Drawn |
| Processing Technology | Hot Rolled | Surfacefinish | Polished, Pickled, or Mill Finish |
| Supply Ability | 10 Ton/Month | Product Name | NACE MR0175 Stainless Steel Seamless Pipe 316L Seamless Tube SCH80 Oil & Gas Industry Pipe |
| Supply Capacity | 10000tons | Delivery Time | 15-30 Workdays |
| Origin | Wenzhou | Certifications | ISO/EN 10204 Type 3.1 / 3.2 available |
| High Light | pipe | Product Type | Pipe |
| Material Grade | TP304,TP316L,TP310,TP347 | Ndt | HT/ET/UT/RT |
| Corrosionresistance | High corrosion resistance | Packaging Details | Standard Shipping Package |
| Stock Availability | Regular Sizes In Stock for Fast Delivery | Material Type | Martensitic stainless steel |
| Model Number | Stainless Steel Seamless Pipe | Brand Name | TOBO |
| Certification | ISO/TUV/SGS | Place of Origin | Shanghai,China |
| High Light | NACE MR0175 stainless steel pipe ，316L seamless tube SCH80 ，oil & gas industry pipe | ||
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
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.
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.
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.
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.
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.
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.
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.
Company Details
Business Type:
Manufacturer,Agent,Importer,Exporter,Trading Company,Seller
Year Established:
1998
Total Annual:
100000-100000000
Employee Number:
200~300
Ecer Certification：
Verified Supplier
TOBO GROUP sales head offce in Shanghai. We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area ... TOBO GROUP sales head offce in Shanghai. We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area ...
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